I Am Installing a Battery Monitor on My Boat - Where Does the Shunt Go?
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- เผยแพร่เมื่อ 15 พ.ย. 2024
- This is one of our most asked questions, "where do I install the battery shunt when I am installing a battery monitor on my boat?" Join Jeff Cote as he uses diagrams to explain the installation.
Read our Tech Talk Article from Pacific Yachting Magazine, "Understand Your Battery Monitor While Charging", www.pysystems....
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thanks for this video.
pretty clear explanation.
getting ready to install a Thornwave internal shunt device in my bay boat,house and start battery.
this video makes me rethink what i need to do.
putting all negatives on one common terminal block is a cleaner install for sure.
john
Glad it helped
how or where do you tie the negative of a second house battery using one shunt to monitor the two house batteries?
i have watched all your videos on installing the shunt and I will watch them all again a few more times. pretty sure something is amiss in my current battery wiring and havent figured it out yet.
Hi David, when installing your shunt to a battery monitor, make sure the shunt is a single choke point for all negative current going to the battery bank, in other words, to negative wire should bypass the shunt and connect directly to the battery bank.
Diagrams are king because on the boat it would be so easy to run the negatives together... because they're common, right?! Thanks again Jeff. Looking forward to your collaboration with Magic Carpet
Thanks for sharing.
Great timing, this was on my list of information to look up this morning.
Glad it was helpful!
Always learn something when I watch your videos!
Awesome, thank you!
Thanks. Literally doing this this week.
Good luck!
Great video. I need to double check on my Link Sys monitor.
You should!
Up until I learned about shunts, I'd always think about the battery negative post being 0V. Now, I think about the negative distribution matrix as 0V, and recognize the battery negative as slightly above 0V (given the "voltage drop" across the shunt). Right or wrong, I find that mentality makes the whole system easier to understand. :)
Glad to help.
Great info! Please don’t stop …. Very informative. Thanks!
Thanks, will do!
Poor description. Tells you what not to do but not how to wire your house bank to the shunt- which is the whole point of the BMV 702
Hey. Thanks for grate vids! Im installing shunt in my boat , and have a few questions. What about negative from engine dynamo and negativ from engine starter? Direct from startbattery or other side of shunt? I have also shorecharger and mppt charger from solar panel. Same way? Also Victron . Thank you
3x house battery(360ah) , 1 startbattery (120ah)
Outstanding. Thanks Jeff.
Glad to help.
Hi Jeff, Many thanks for the great videos. I am installing a Victron Smart Shunt 500 on a 32 Foot sail boat. I have two 12v banks Domestic and Engine and wish to monitor both, via the Victron Connect App. As per your video the Domestic Battery Negative is connected to the shunt and the Engine Negative is connected to the Negative distribution Busbar. However it helps me, due to cable routing, to connect the Engine Battery Negative directly to the Negative post on the Engine and then also run a cable from the Negative Busbar to the Negative post on the Engine, there is nothing in between these points, so it is almost like I am extending the Busbar by < 1M of cable. So my question is, please, are there any pitfalls with this approach?
Tom, if you plan on monitoring both battery banks, you'll need two shunts, one on the house battery and the other on the engine battery. Your DC negative wiring seems to make sense to me.
So I have a question I can't find the answer to... I have a sailboat with 2 house batteries (100 Ahr each) combined/separated with a Perko switch. I have a separate starter battery combined/separated to the house bank with a second Perko switch. The negatives on the 2 house batteries should be connected together, then a lead to the shunt and from there to the negative battery buss? If so, would the first Perko switch on the house bank serve any purpose to monitor those batteries separately? What is the correct placement of the shunt?
Great video. On a Catalina 38 I have it connected just like you explained , and also both banks negatives are also connected to engine block.. do I still need this this “negative to negative” wire, or is redundant and unnecessary?
Ideally, your engine chassis should not be an busbar for negative connections, better to have one large negative connection from the engine chassis to a common negative busbar, where each battery is connected.
Should there be a shunt on each bank? with a ACR?
Thanks Jeff, if you have 2 house batteries, how would it connect ?
Assuming both house batteries are wired as one battery bank, then your house battery bank (made of two batteries) would have only one negative connection to the negative distribution via a shunt.
I was hoping to see how and where to attach/mount the shunt to something so that it isn’t bouncing around or shorting between the terminals. There are no mounting holes, tabs or anything to address this HUGE issue!!!
thanks for the video, as usual a learning moment.
is it useful to put a shunt on both the house and the engine battery? (so 2 shunts)
If you want to measure house and engine battery capacity, you'll definitely need two shunts. Very few boaters do that, and generally use voltage of the engine battery to infer battery capacity.
@@PacificYachtSystems thanks
Question, Is there a moniter on the market that has the display showing all the time and let you volley back and forth between different battery banks. Please confirm whether you would need a shunt for each seperate battery back if you wanted separat readings.
You are the Man!! Ty
This doesn’t make sense, why would you want to include the starter battery in the house bank, they should be 2 different entities,
What would be a good system to monitor batteries and other systems remotely so that you can keep an eye on things when you are not near the boat?
Very limited real world experience on this, Victron and Maretron have solutions for this, but haven't tried on my own boat, yet. Anyone else can share in.
Where does the power wire, positive red, connect on a 36 volt in series battery set up? Any 12 volt lug or to the 36 volt lug? Thank you
Greg, assuming your battery monitor can be powered by 36 volts, then wire the battery monitor positive lead to the 36 volt post of the battery bank.
How do you determine what shunt Amp size to buy?
By anticipating the largest current draw on your battery bank, most likely a windlass/winch or the the inverter or the starter.
Installed a Victron wireless shunt on my boat and it works very well. However, I think it scews up my smart chargers. Chargers try to sense when batts are fully charged but with shunt installed they never sense battery is fully charged, and continue to charge. Kind of one smart device vs. another. Does this make any sense? Have one charger for house and separate one for start battery. Had Victron monitor house battery and with aux lead monitor start batt voltage. Actually destroyed start battery. Coincidence?
Hmmm, how would the victron wireless shunt communicate with your smart chargers? Wasn't aware of that. Also, never heard of a battery monitor shunt influencing any battery charging, to my knowledge they are separate. Anyone else can chime in?
I am trying to find a battery monitor that is water proof for my bass boat and my trolling motor is 24 volt system and the batteries are the Dakota Lithium, I have tried the Victron BMV 712 and its been replaced 6 times over the last year, it has a compatibility problem with the lithium batteries in 24 volt an is not waterproof, Amazon is full of the cheaper units from China and then I see some of the real high dollar ones from the marine industry and most of them are not water proof, it just needs to be simple, I want to be able to look down and see how much charge the batteries have before I have to switch over to my second set, thanks
very difficuld because my shunt is only to 100Amp.. and i suppose my starting motor from my engine.. and my bow truster ( connected to start battery) are taking more then 100 amp.i have my negatives connected on my engine.. and my shunt connected to the negative of my acc.battery.. thats completly wrong then?
Hi DDB, a 100 amp shunt is smaller then usual as most are 500 and some are a 100 amps. The starter and thruster loads on your engine battery, should not be measured on your house battery shunt, unless you selected the house battery to run your starter and thruster.
Hi Jeff, In this example, is the battery monitor only measuring the state of the house battery (or the starter battery too)? Thanks.
Only monitoring the house bank as that's the one you need to know the capacity remaining. Your house loads should not be drawing off your start battery at all.
Won't the shunt be measuring the starter battery also if it's negative is connected to the negative distribution terminal ?
@@DJohns-nz4ul That was my thought too and the reason I was asking.
Only the house battery.
The common negative distribution needs to be connected to both battery negatives (house and engine) and also the engine chassis block. The shunt is located in between the common negative distribution and the house battery negative, effectively measuring all amps going in and out of the house battery.
The shunt has a power connection that plugs in and is not on your diagram!
Thanks Greg for the update.
Did my comment get deleted?
Hi Catalina 27, Jeff here, and we'd love to see what you wrote. Please post again.
@@PacificYachtSystems , hey Jeff, I just said that you know enough to have your mind blown 🤯 by this Veritasium video…..
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