I am finally understanding so very much. Instead of someone ridiculing me for using the wrong terminology because I just don't know, I am getting real teaching from an expert knowledgeable about marine electrical systems. LOVE it!!
I agree. Someone who says: " there are no stupid questions" right from the outset, gives students confidence. Its up to students to ask questions to reinforce their understanding. This guy won't be intimidating you and thats a terrific start. He also knows his stuff.
@@PacificYachtSystems when you do presentations please repeat the questions as you are the only one with the microphone. not just for the room but especially for the recordings. Otherwise great presentations so far
Outstanding learning opportunity. Great presentations. I haven't read the comments but will suggest the speaker either repeat the audience questions or have a remote mic for better sharing of the questions.
I'm finding these very helpful and informative. The tutor has a very friendly style, but, a good communicator will always repeat a student's question for the benefit of the audience in the room, let alone viewers.
I bought a used boat with old, non functional electrical system. This is an awesome resource to get me up to speed on what to do and what pitfalls to avoid.
I really respect and appreciate that the teacher is clearly focussed on safety. I used to teach electrotechnology ( apprentice electricians), and I would say this guy is an exemplar example of a good and knowledgeable teacher. Im really enjoying his lectures.
I’m re wiring my boat, I feel like an expert now. 😎 Jokes aside, this is awsome series so far, will be watching the rest before finalising my plan. Thank You!
This is a great series!!! Keep up the good work. However, DC can be just as dangerous as it only takes slightly 50mA and over to stop the heart (AC or DC). This is the reason that in control circuits the standard is 4-20mA which is inherently safe. Figured I would point that out if you ever talk about it again in public.
@@PacificYachtSystems Hi Guys, I have been watching all of your videos lately and am now very interested in an electrical survey. I am a first time boat owner and want to know if you have services in the Boston area or are you only in the Pacific North West? Thanks for sharing your content
Hi Gene, we offer remote design/consultation services to boaters outside of the pacific Northwest. See link to PYS website here: www.pysystems.ca/electrical-design/
Small comment about DC sytemsafety, a high amperage on a dc circuit is also lifetreatening! Always measure first, and if at all possible disconnect the source (battery).
@@PacificYachtSystems I really never tried it because im always really carefull. But when DC Current flows through your body it can cause your hearth to stop, with the right amperage you can die from 12V if the current uses your body as a conductor. Electric chairs are also low Voltage High Amperage DC contraptions (the version Edison build). (Maybe i sound really dumb and i am totally incorrect, then please correct me)
The biggest danger from high current 12v is complacency rather than electrocution. The fact that you are not going to be electrocuted by it means you're more likely to reach inside a battery bank without taking off things like rings and watches. If a ring or watch strap shorts a battery out the very best outcome is some light burns and a partially destroyed watch or ring. (edited to remove a lot of rambling) BTW, I can't find anything about Edison building a low voltage high current electric chair. As I understand it the one he built operated at around 1000V AC. They later switched to over 2000V AC after the first model cooked someone to death over about a minute rather than killing him quickly as promised. I suppose that means you could call Edison's chair "low" voltage but you'd have use air quotes ;)
Don't agree captain Eric. 12 volt safe even with high amperage, dangerous explosion wise. Amperage =fire or explosions . Higher voltage 50 or more kills.
This is a very different approach, it's great for folks like me just past early learner stage, I can recognise poor wiring, but now this helps me to know why.
Jeez, I just read through the comments. Some people.... You are basically giving tens of thousands of hours experience for FREE and they have the nerve to criticise the way you speak! You have good patience. I think I would have flipped a couple of birds by now if i were you. 😂 These videos are literally the difference of me setting out on this task confidently or doing a dodgie. My future self thanks you too. :-)
Thanks Knight-errrant. We publish videos for those appreciate them and use the feedback from everyone to make the videos better. As a business owner for 14 years now, I've grown a pretty think skin.
I dont assume that when people speak their thoughts that they are being "critical". I believe that they are only engaging in conversation . Please dont be so hyper-sensitive and project your angst upon others.
Awesome instructional videos. It is awesome that you share your knowledge, but even doing that it seems like you find your share of potential dangerous boats
Jeff, on the inverter with load sensing I would think that most quality meters like your clamp on have a high input impedance (to protect sensitive electronics) and I would imagine it would not pull anywhere near 50 watts. Probably an old style solenoid tester like a Wiggie would pull enough to call for power.
great series, i have a pearson 33-2 that I am upgrading most of my electrical and electronics, solar and nema 2000 in preparation for relocating from the OBX to the tropics. Thanks for your sage advice
Re the clamp meter... handy perhaps if you also explain that only ONE wire at a time gets clamped to avoid a backfeed read (ie both active & neutral) and also that its important to make sure that the single wire sits close to the central area of the closed clamp and not close to the side.
What a GREAT speaker!!! EXREMELY knowledgable!!! Well spoken!!! Everything you could possibly want to keep your attention through a lengthy seminar!!! Just one suggestion - eliminate the word "right" which he says about every 15 seconds - it's like fingernails on a chalkboard.
“Realistically how many AC circuits do I have to work on on a boat” You must work on very small boats! How about all the three phase AC motors? Steering pumps, engine room blowers, AC units, air compressors, water pumps, fire pumps, bilge pumps, fuel pumps, ballast pumps, the list goes on. Then almost everything else is a single phase AC load washer/dryer, water heaters, stove/oven, refrigerators and freezers, lighting, ect. Hell the only 2 batteries outside the little ones in the fire alarm and emergency lighting start one small genset and power the wheelhouse electronics. Every other engine from gensets to main engines are air start. I’d say DC power is almost unused on the boats I work on from tugs to OSVs to passenger boats to private yachts.
Like Captain Eric says: d.c. can also, indeed equally but differently- be lethal. Remember that it is NOT voltage that kills you, it is the current, or amps.... AND as with AC current, it is cycling 'on & off' at 50-60 hertz or "cycles per second". so you can sometimes get "lucky" and be thrown (violently) away from the live conductors ... HOWEVER, with d.c. being a constant, direct current, on contact - and especially while gripping say a pair of non-insulated pliers or even directly on to a live cable, when your muscles contract, you may very well grip so tightly to the source of energy that NOTHING will release your hand from the energy. Its most often curtains for you in this case unless your working closely with someone who knows enough to react immeadiately and be prepared to break your arm with something heavy and non-conductive in order to disconnect you from the supply.... but even then no promises. BTW, a few mA (milliAmps) over a few seconds can kill a person. Also note, not everyone has the same internal resistance, which is also a factor.
@@PacificYachtSystems I have been immersed in your videos for the last few days. Electrical systems has always been black magic to me, even as someone with a technical degree. With these videos I am finally catching on to beyond the basics of "Electricity is a circuit" so thank you for publishing these! I would love to see more trouble shooting videos on marine electronics; installing a new system, for me, would be easier than figuring out how to test, diagnose and fix existing problems. Thanks once again for making these!
My analogy is that voltage is like muzzle velocity and amperage is the calibre/size of the round being fired...With distance, the muzzle velocity drops - same as voltage drop.
Loving this series, thank you for posting it online for free. By 'welding wire' are you referring to any standard/automotive grade strand copper wiring?
I wish there were another term other than welding wire. Perhaps 'low voltage wire'? The problem is, at what point do you NOT go into deeper theory and discuss not only wire gauge or csa 'cross sectional area' but then start discussing the resistivity of the different copper conductors?
You said no dumb questions ... If the circuit was a water hose - and the flow was water - when you turn the flow off, you'd have standing water throughout the hose. Is there residual electricity in wires once you open/break the circuit? Thanks in advance, Chris
Hi Chris, Hmmm…. What a great question. Your comparison is right, on one side of the circuit connected to say a 12 VDC battery, you’d have 12 VDC at the end of circuit. Think about, a wire connected to 12 VDC battery post is also energized. The other side of the circuit, i.e. a switched load like a light, would be connected to the negative connected to the negative of the battery. This difference in potential is similar to a height of a water column… on one side 12 VDC of potential and on the other side 0 VDC. Hope this helps.
Thank you and hope to see many thumbs up for your Basic Marine Electrical series. I have viewed all six videos and learned enough information, for me, that I will watch all of them again and take notes!
on an AC circuit you would still show residual voltage even though the circuit is dead. Some where around 3 to 5 volts on a 120 volt circuit. Thats why you should always use a multimeter to verify a circuit is dead and not one of the devices that senses voltage in a circuit by just lighting up.
You talk about absolutely disconnecting DC from the Inverter and you say to use the Master DC switch. If you wanted to be absolutely sure, why wouldn't you pull the Positive terminal on the battery(s)? Wouldn't this be safer, knowing that the master switch could fail?
@@PacificYachtSystems my friend has a 50ft motorised sailing yacht. Last Thursday in Largs Scotland he had it out of the water. He was stood on a metal Ladder he was pointing out the life boat that was in a suitcase looking thing attached to back of the boat. As he touched the cage thing it was stored in. He received a shock from it, I got my multimeter out and measured 78 volts ac between the Ladder and hand rail. I checked to see if the hand rail was attached to the earth of the boats and it was. I got my earth fault loop tester out and at first I could not get a reading. The next day I got a reading of 567 ohms I then checked the earth at the supply on land and found it to be 79 ohms. I checked the RCDs operating time of the boat it correctly didn't trip at half times its rated and it tripped at its rated tripping current on the positive half cycle. When I checked the hand rail to the earth of the boat it was not showing continuity. I'm back up to Scotland again later this month to try and work it out.
So, a in voltage drop in a circuit powering a light, VHF, chartplotter, etc. these devices don't demand the power that they need to operate, so they stop working if the voltage drops below their threshold. But a windlass can keep working with a voltage drop, by demanding the power that it needs? Is that an electric motor thing? From the equations, it seems like the motor's resistance must drop if the voltage to it drops??
Anthony, good question. From my understanding, many electrical devices have input voltage range, where they will work, for example 9 - 16 volts. As the voltage drops to any electrical device, it's normal to see the amperage increase as the voltage decreases. Perhaps a fellow viewer can provide both of us a better explanation of the behaviour.
Hi Dan, welders use welding wire (non-tinned, non boat insulation) for welding. Unfortunately, some boat builders and DIY use welding wire instead of marine grade wire aboard boats because the low price seems so attractive. Unfortunately, you get what you pay for and welding wire should NEVER be used aboard a boat.
He means the wire used on a welding machine for the earth clamp and the hand piece. This guy isn't very good. More interested in being the centre of attention than making an information dense video.
I might be wrong but isn't this the guy who played Dead Pool? Amazing video though, I am a noob boat owner and this video made me go back to my boat, like right now...
Why do engineers always teach conventional flow? Current travels from negative to positive (I know you know that but most engineers like to talk conventional flow.) I remember trying to understand electronics when my book used electron flow and my instructor used conventional. Darn confusing!!
Speed is not a synonym for current! Strength should be better explanation! Very similar to torque on the engine!! Amper hours is a measurement for capacity of a battery, not for current! Even in a literature (and on the batteries), we can see a very wrong measurement, such as cranks, which tends to explain how many times we should be able to start the engine. Engine? What engine? 2 cylinders, 4 cylinders? 6 cylinders etc? Is this the same "cranks" for every engine???
Hi Boba ILIK, here a definition of amps from Wikipedia: "The ampere was then defined as one coulomb of charge per second. In SI, the unit of charge, the coulomb, is defined as the charge carried by one ampere during one second." Basically, amps is a measure of unit over time, specifically coulomb of charge per second.
Hi October, Blues Sea Systems has lots of good sample DC diagrams, here’s one for you: www.bluesea.com/resources/170/Battery_Management_Wiring_Schematics_for_Typical_Applications
Jeff you present lots of information but your discussion belabors each point you make...don't be so chatty and keep on the topic. you spent 6 minutes from 30 to 36 talking about shutting off the inverter. With soooo much chat it becomes easy to miss the point you are trying to make.
@@PacificYachtSystemsThanks for your reply Jeff. I intend to re-watch your videos, but I'll ask you for a favor. Would you create a summary statements, as take-aways at the end of each video. I recall one take away for me, after your discussion about the 3 types of batteries. AGM batteries are the best choice. Another one comes to mind after watching you talk about wires load capacity and fuses.Guard each different sized length of wire with a fuse, guard each appliance with a fuse.
I found Jeff's tangent on in inverter dc shut off switch to be extremely helpful, so I beg to differ. Survey on my Camano called for this switch. I eventually got around to have my marine electrician install it. It wasn't really explained to me why this switch is so important. Now I know. Thanks Jeff!
I think you are looking for a different video: "Inspirational Boat Electronics Seminar." This is a look at the mistakes of others so that we can all learn from them.
@@PacificYachtSystems I don't mean to be harsh. To be fair, I did learn a great deal from the seminar videos. I kept my fingers on the arrows skipping 5 seconds at a time to catch the good stuff. You go through thousands of ways on how not to do electrical and i understand you've seen way too much working on boats for so long. I share your passion for boating and electrical components. If i may suggest an improvement, I would make a video only about the right way to do things and why we should do them the right way. I loved your concept diagram in the first video. Very informative. I wish we stuck to that diagram the whole time and went through the various components talking about the right way to do things. To be honest, you mentioned so many wrong things people did on their boats, i'm tempted to use some of these crazy shortcuts. You make a strong point about the triangle of quality. If you want to do things right, you have to spend the necessary time. Shortcuts will most likely lead to failure and i couldn't agree more this is applicable to every aspect of life. Thank you for sharing your knowledge with us and keep up the good work. Happy Boating.
We all come from different experience levels. From where I’m coming from the pace, the examples and course structure could hardly be improved. Maybe someone else needs less repetition. For me it’s very helpful
![Battery-Powered AIR CONDITIONING on a Sailboat [Capable Cruising Guides]](http://i.ytimg.com/vi/xF113aUlZgo/mqdefault.jpg)
I'm truly learning much here as it pertains to boats. While expirenced in auto and home circurts, marine as you point out is a diffrent ball game.
I am finally understanding so very much. Instead of someone ridiculing me for using the wrong terminology because I just don't know, I am getting real teaching from an expert knowledgeable about marine electrical systems. LOVE it!!
That's awesome, thanks for sharing! Glad to be part of your journey for understanding more about marine electrical systems.
I agree. Someone who says: " there are no stupid questions" right from the outset, gives students confidence. Its up to students to ask questions to reinforce their understanding. This guy won't be intimidating you and thats a terrific start. He also knows his stuff.
This guy is a very interesting instructor and this is the best informational series I have come across in years.
Thank you for the feedback.
@@PacificYachtSystems when you do presentations please repeat the questions as you are the only one with the microphone. not just for the room but especially for the recordings. Otherwise great presentations so far
Outstanding learning opportunity. Great presentations. I haven't read the comments but will suggest the speaker either repeat the audience questions or have a remote mic for better sharing of the questions.
Well said! thanks Bob.
I'm a marine engineer mechanically biased, needed to go over my electrics, really enjoying these videos. Thanks
The bit about load sensing inverters alone justified the time I spent listening. Thanks!
Glad to help David.
I'm finding these very helpful and informative. The tutor has a very friendly style, but, a good communicator will always repeat a student's question for the benefit of the audience in the room, let alone viewers.
Dude, you are a great presenter and explainer. Really enjoying all your videos as I prepare to refit my 1987 boat.
Thanks Brad, glad my explanations make sense to you.
I am so so thrilled to come across this series and i will be following all of his postings and courses.
Thank you for mentioning load sensing, being a land based spark that was eye opening. Thank you.
Thanks Andrew.
I bought a used boat with old, non functional electrical system. This is an awesome resource to get me up to speed on what to do and what pitfalls to avoid.
Congratulations on your new boat! And thank you for the kind words.
I really respect and appreciate that the teacher is clearly focussed on safety. I used to teach electrotechnology ( apprentice electricians), and I would say this guy is an exemplar example of a good and knowledgeable teacher. Im really enjoying his lectures.
These are very insightful, and to post publish for the community with no fee is fantastic. Only wish we had PYS in the Bay Area!
Thanks Nick!
Your instructional videos are enjoyable to watch. Thanks
What an excellent presenter and instructor! Thanks for sharing!
Thanks S Smith. Glad you enjoyed the content.
Greate analogies that help to fixed concepts. Thank you for coming up with them.
I’m re wiring my boat, I feel like an expert now. 😎
Jokes aside, this is awsome series so far, will be watching the rest before finalising my plan.
Thank You!
Awesome, thank you!
This is a great series!!! Keep up the good work. However, DC can be just as dangerous as it only takes slightly 50mA and over to stop the heart (AC or DC). This is the reason that in control circuits the standard is 4-20mA which is inherently safe. Figured I would point that out if you ever talk about it again in public.
This is one of the best seminars I have seen, it makes me double think about what i'm about to do. Thanks for sharing
Hi Gene, glad you enjoyed our content.
@@PacificYachtSystems Hi Guys, I have been watching all of your videos lately and am now very interested in an electrical survey. I am a first time boat owner and want to know if you have services in the Boston area or are you only in the Pacific North West? Thanks for sharing your content
Hi Gene, we offer remote design/consultation services to boaters outside of the pacific Northwest. See link to PYS website here: www.pysystems.ca/electrical-design/
Small comment about DC sytemsafety, a high amperage on a dc circuit is also lifetreatening! Always measure first, and if at all possible disconnect the source (battery).
Hi Gardureth, can you tell me more about that, seriously didn't know.
@@PacificYachtSystems I really never tried it because im always really carefull.
But when DC Current flows through your body it can cause your hearth to stop, with the right amperage you can die from 12V if the current uses your body as a conductor.
Electric chairs are also low Voltage High Amperage DC contraptions (the version Edison build).
(Maybe i sound really dumb and i am totally incorrect, then please correct me)
Thanks for sharing.
The biggest danger from high current 12v is complacency rather than electrocution. The fact that you are not going to be electrocuted by it means you're more likely to reach inside a battery bank without taking off things like rings and watches. If a ring or watch strap shorts a battery out the very best outcome is some light burns and a partially destroyed watch or ring.
(edited to remove a lot of rambling)
BTW, I can't find anything about Edison building a low voltage high current electric chair. As I understand it the one he built operated at around 1000V AC. They later switched to over 2000V AC after the first model cooked someone to death over about a minute rather than killing him quickly as promised. I suppose that means you could call Edison's chair "low" voltage but you'd have use air quotes ;)
Don't agree captain Eric. 12 volt safe even with high amperage, dangerous explosion wise. Amperage =fire or explosions . Higher voltage 50 or more kills.
This is a very different approach, it's great for folks like me just past early learner stage, I can recognise poor wiring, but now this helps me to know why.
Jeez, I just read through the comments. Some people.... You are basically giving tens of thousands of hours experience for FREE and they have the nerve to criticise the way you speak! You have good patience. I think I would have flipped a couple of birds by now if i were you. 😂
These videos are literally the difference of me setting out on this task confidently or doing a dodgie. My future self thanks you too. :-)
Thanks Knight-errrant. We publish videos for those appreciate them and use the feedback from everyone to make the videos better. As a business owner for 14 years now, I've grown a pretty think skin.
I dont assume that when people speak their thoughts that they are being "critical".
I believe that they are only engaging in conversation . Please dont be so hyper-sensitive and project your angst upon others.
Awesome instructional videos. It is awesome that you share your knowledge, but even doing that it seems like you find your share of potential dangerous boats
Jeff, on the inverter with load sensing I would think that most quality meters like your clamp on have a high input impedance (to protect sensitive electronics) and I would imagine it would not pull anywhere near 50 watts. Probably an old style solenoid tester like a Wiggie would pull enough to call for power.
great series, i have a pearson 33-2 that I am upgrading most of my electrical and electronics, solar and nema 2000 in preparation for relocating from the OBX to the tropics. Thanks for your sage advice
Re the clamp meter... handy perhaps if you also explain that only ONE wire at a time gets clamped to avoid a backfeed read (ie both active & neutral) and also that its important to make sure that the single wire sits close to the central area of the closed clamp and not close to the side.
What a GREAT speaker!!! EXREMELY knowledgable!!! Well spoken!!! Everything you could possibly want to keep your attention through a lengthy seminar!!! Just one suggestion - eliminate the word "right" which he says about every 15 seconds - it's like fingernails on a chalkboard.
Thanks Steve. We'll keep in mind. Always learning!
this information is priceless. thank you for filling the blanks
Thanks!
You did an excellent job. I learned a lot. Thanks from Istanbul!
Thanks Sailor Pilot
“Realistically how many AC circuits do I have to work on on a boat” You must work on very small boats! How about all the three phase AC motors? Steering pumps, engine room blowers, AC units, air compressors, water pumps, fire pumps, bilge pumps, fuel pumps, ballast pumps, the list goes on. Then almost everything else is a single phase AC load washer/dryer, water heaters, stove/oven, refrigerators and freezers, lighting, ect. Hell the only 2 batteries outside the little ones in the fire alarm and emergency lighting start one small genset and power the wheelhouse electronics. Every other engine from gensets to main engines are air start. I’d say DC power is almost unused on the boats I work on from tugs to OSVs to passenger boats to private yachts.
Like Captain Eric says: d.c. can also, indeed equally but differently- be lethal. Remember that it is NOT voltage that kills you, it is the current, or amps.... AND as with AC current, it is cycling 'on & off' at 50-60 hertz or "cycles per second". so you can sometimes get "lucky" and be thrown (violently) away from the live conductors ... HOWEVER, with d.c. being a constant, direct current, on contact - and especially while gripping say a pair of non-insulated pliers or even directly on to a live cable, when your muscles contract, you may very well grip so tightly to the source of energy that NOTHING will release your hand from the energy. Its most often curtains for you in this case unless your working closely with someone who knows enough to react immeadiately and be prepared to break your arm with something heavy and non-conductive in order to disconnect you from the supply.... but even then no promises.
BTW, a few mA (milliAmps) over a few seconds can kill a person. Also note, not everyone has the same internal resistance, which is also a factor.
Either having a mic on the crowd or repeating the questions would have been really nice.
Hi Cody, you are so correct. Our next video will do that.
@@PacificYachtSystems I have been immersed in your videos for the last few days. Electrical systems has always been black magic to me, even as someone with a technical degree. With these videos I am finally catching on to beyond the basics of "Electricity is a circuit" so thank you for publishing these!
I would love to see more trouble shooting videos on marine electronics; installing a new system, for me, would be easier than figuring out how to test, diagnose and fix existing problems.
Thanks once again for making these!
My analogy is that voltage is like muzzle velocity and amperage is the calibre/size of the round being fired...With distance, the muzzle velocity drops - same as voltage drop.
Good one, thanks for sharing.
Loving this series, thank you for posting it online for free. By 'welding wire' are you referring to any standard/automotive grade strand copper wiring?
Correct.
I wish there were another term other than welding wire. Perhaps 'low voltage wire'? The problem is, at what point do you NOT go into deeper theory and discuss not only wire gauge or csa 'cross sectional area' but then start discussing the resistivity of the different copper conductors?
Great... Many Thanks for it... keep it up!!!
You said no dumb questions ... If the circuit was a water hose - and the flow was water - when you turn the flow off, you'd have standing water throughout the hose. Is there residual electricity in wires once you open/break the circuit?
Thanks in advance,
Chris
Hi Chris,
Hmmm…. What a great question. Your comparison is right, on one side of the circuit connected to say a 12 VDC battery, you’d have 12 VDC at the end of circuit. Think about, a wire connected to 12 VDC battery post is also energized. The other side of the circuit, i.e. a switched load like a light, would be connected to the negative connected to the negative of the battery. This
difference in potential is similar to a height of a water column… on one side
12 VDC of potential and on the other side 0 VDC. Hope this helps.
Thank you and hope to see many thumbs up for your Basic Marine Electrical series. I have viewed all six videos and learned enough information, for me, that I will watch all of them again and take notes!
on an AC circuit you would still show residual voltage even though the circuit is dead. Some where around 3 to 5 volts on a 120 volt circuit. Thats why you should always use a multimeter to verify a circuit is dead and not one of the devices that senses voltage in a circuit by just lighting up.
i wish i could hear the audience questions
At 15:22 you have a picture of the meter set to diode check not ohms.
You talk about absolutely disconnecting DC from the Inverter and you say to use the Master DC switch. If you wanted to be absolutely sure, why wouldn't you pull the Positive terminal on the battery(s)? Wouldn't this be safer, knowing that the master switch could fail?
Hi Todd, in absolute terms you are correct as a battery switch could potential fail open or closed, albeit that is a very rare occurrence.
1:45 en.wikipedia.org/wiki/Ampere Amps are coulomb per second. And coulomb is something like 1.6*10^19 electrons (or elementary charges)
1:55 think it says something similar here but cant know for sure.
43:58 Volt is Joule per Coulomb. So how much energy each pakage contains. And Watt is V*A=W or W=J/s Energy per Second.
Ws (Wattseconds)= J (Energy)
Thanks for sharing!!! Love it.
Have I read this correctly! Electrons will NOT flow through insulators. Electrons will flow through anything if the voltage is high enough.
Hi Rob, thanks for clarification. Luckily most battery banks on boats are 12/24 VDC and most AC systems on boats are 120/220 VAC.
@@PacificYachtSystems my friend has a 50ft motorised sailing yacht. Last Thursday in Largs Scotland he had it out of the water. He was stood on a metal Ladder he was pointing out the life boat that was in a suitcase looking thing attached to back of the boat. As he touched the cage thing it was stored in. He received a shock from it, I got my multimeter out and measured 78 volts ac between the Ladder and hand rail. I checked to see if the hand rail was attached to the earth of the boats and it was. I got my earth fault loop tester out and at first I could not get a reading. The next day I got a reading of 567 ohms I then checked the earth at the supply on land and found it to be 79 ohms. I checked the RCDs operating time of the boat it correctly didn't trip at half times its rated and it tripped at its rated tripping current on the positive half cycle. When I checked the hand rail to the earth of the boat it was not showing continuity. I'm back up to Scotland again later this month to try and work it out.
The term is Cadio or cardiac fibrillation
Can you go back and add subtitle texts showing all the questions that you are answering? We don’t know what the questions are, only the answers.
Good point Andrew, tks for the suggestion.
So, a in voltage drop in a circuit powering a light, VHF, chartplotter, etc. these devices don't demand the power that they need to operate, so they stop working if the voltage drops below their threshold. But a windlass can keep working with a voltage drop, by demanding the power that it needs? Is that an electric motor thing? From the equations, it seems like the motor's resistance must drop if the voltage to it drops??
Anthony, good question. From my understanding, many electrical devices have input voltage range, where they will work, for example 9 - 16 volts. As the voltage drops to any electrical device, it's normal to see the amperage increase as the voltage decreases.
Perhaps a fellow viewer can provide both of us a better explanation of the behaviour.
50:30 ohms law , 56:05 units
Good afternoon . You could not include subtitles. I do not understand English well. Thank you very much.
This is a terrific series. Does anyone know of a similar group like this for marine engines?
Hi Luke, not sure, if you do find a similar series for mechanical let me know.
Unless you get a special clipon ammeter, it will not measure DC current only AC.
Have you seen this meter:
www.bluesea.com/products/8110/Mini_Clamp_Multimeter_-_AC_DC
Very good information
The takeaway: Eliminate as much as possible, resistance in your boat's wiring.
Yep.
What is "welding" wire? Is that a Canadian term?
Hi Dan, welders use welding wire (non-tinned, non boat insulation) for welding. Unfortunately, some boat builders and DIY use welding wire instead of marine grade wire aboard boats because the low price seems so attractive. Unfortunately, you get what you pay for and welding wire should NEVER be used aboard a boat.
He means the wire used on a welding machine for the earth clamp and the hand piece. This guy isn't very good. More interested in being the centre of attention than making an information dense video.
I might be wrong but isn't this the guy who played Dead Pool? Amazing video though, I am a noob boat owner and this video made me go back to my boat, like right now...
Hi La Soluna, I'm the guy in the video and you got me giggling... clearly you are referring to Dead Pool after the horrible accident... LOL.
@@PacificYachtSystems LOL We love you videos, very helpful for new boat owners like us. Thank you!
Why do engineers always teach conventional flow? Current travels from negative to positive (I know you know that but most engineers like to talk conventional flow.) I remember trying to understand electronics when my book used electron flow and my instructor used conventional. Darn confusing!!
Speed is not a synonym for current! Strength should be better explanation! Very similar to torque on the engine!! Amper hours is a measurement for capacity of a battery, not for current! Even in a literature (and on the batteries), we can see a very wrong measurement, such as cranks, which tends to explain how many times we should be able to start the engine. Engine? What engine? 2 cylinders, 4 cylinders? 6 cylinders etc? Is this the same "cranks" for every engine???
Hi Boba ILIK, here a definition of amps from Wikipedia: "The ampere was then defined as one coulomb of charge per second. In SI, the unit of charge, the coulomb, is defined as the charge carried by one ampere during one second." Basically, amps is a measure of unit over time, specifically coulomb of charge per second.
Anybody has a simple wiring diagram? 1 battery, ignetion, switch panel, 1 outboard motor
Hi October, Blues Sea Systems has lots of good sample DC diagrams, here’s one for you: www.bluesea.com/resources/170/Battery_Management_Wiring_Schematics_for_Typical_Applications
I thought DC was dangerous cos if it grasps you, you can;t let go, unlike AC,
It's just the opposite. The Alternating Current (AC) is what makes your muscles to contract and you cannot let go.
A saying I heard years ago. DC burns, AC kills.
Too many anecdotal stories ???
Hi Eric. thanks for your feedback.
It’s great to learn from someone else’s mistakes. Makes me look like a genius. Galileo
gripping but needs to get to the point
Jeff you present lots of information but your discussion belabors each point you make...don't be so chatty and keep on the topic. you spent 6 minutes from 30 to 36 talking about shutting off the inverter. With soooo much chat it becomes easy to miss the point you are trying to make.
Thanks Brent for the feedback. Will keep in mind for next time.
@@PacificYachtSystemsThanks for your reply Jeff. I intend to re-watch your videos, but I'll ask you for a favor. Would you create a summary statements, as take-aways at the end of each video. I recall one take away for me, after your discussion about the 3 types of batteries. AGM batteries are the best choice. Another one comes to mind after watching you talk about wires load capacity and fuses.Guard each different sized length of wire with a fuse, guard each appliance with a fuse.
I found Jeff's tangent on in inverter dc shut off switch to be extremely helpful, so I beg to differ. Survey on my Camano called for this switch. I eventually got around to have my marine electrician install it. It wasn't really explained to me why this switch is so important. Now I know. Thanks Jeff!
Get to the point too much fluf
so dramatic and negative, everybodys wrong... gee look at the positive
Hi G, thanks for the feedback. Will keep your input in mind on my next presentation.
I think you are looking for a different video: "Inspirational Boat Electronics Seminar." This is a look at the mistakes of others so that we can all learn from them.
i think the whole 6 hours can be summarized in under 10 minutes. good information but unbelievable derailing from the topic. Excessive repetition.
Thanks for the feedback Netshaka.
@@PacificYachtSystems I don't mean to be harsh. To be fair, I did learn a great deal from the seminar videos. I kept my fingers on the arrows skipping 5 seconds at a time to catch the good stuff. You go through thousands of ways on how not to do electrical and i understand you've seen way too much working on boats for so long. I share your passion for boating and electrical components. If i may suggest an improvement, I would make a video only about the right way to do things and why we should do them the right way. I loved your concept diagram in the first video. Very informative. I wish we stuck to that diagram the whole time and went through the various components talking about the right way to do things. To be honest, you mentioned so many wrong things people did on their boats, i'm tempted to use some of these crazy shortcuts. You make a strong point about the triangle of quality. If you want to do things right, you have to spend the necessary time. Shortcuts will most likely lead to failure and i couldn't agree more this is applicable to every aspect of life. Thank you for sharing your knowledge with us and keep up the good work. Happy Boating.
Thanks Netshaka, appreciate the clarification. Good idea... will think about that for a video next.
We all come from different experience levels. From where I’m coming from the pace, the examples and course structure could hardly be improved. Maybe someone else needs less repetition.
For me it’s very helpful
1.5 hrs in and you've said basically nothing..... I think this public speaking thing is more about your ego than sharing information.
Thanks for your candid feedback Freelectron.