Why You MUST Use a 24v Supply For Your Lipo Charger
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Your LiPo battery charger's specifications are all lies. 300 watts? 14 amps? Try it. See if you get it.
If you want to know why your lipo battery charger is not reaching its full specifications, here's the answer: you're running it off of 12v. To get the most out of your charger, you probably need a 24v power supply. I'll tell you why, and where to get one!
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You forgot to mention that the TS100 soldering iron will be in God-mode with a 24v power supply.
That's not Ohm's law, thats Watt's law. Ohm's law is V=IR (or R=V/I) and is about resistance, measured in Ohms
Damn, you're right.
Letting us nerds down! 😂
Learned something 👍
Joshua Bardwell I guess you learned something today
@YerRandO Wait.... Are you the guy still on 3.2!?!? I thought that was a myth!
Parallel charging on the bed. What could possibly go wrong :)
Jakub Steiner 😂 hell no
It's just an example. There was no light on the floor of the hotel room. Come on... I'm making videos on the road you have to make some concessions. Of course I didn't actually charge the batteries on the bed.
You charged them in the bath instead? :)
Hey there's a thought, safety wise, what type of bath (or sink) would be good to charge lipos in? Cue a chance for someone to explode lipos in sinks & baths (outside obviously) for science! and fun!
It was a joke. And a good one 🤣
@@JoshuaBardwell Lol you got really defensive there
Hey Joshua- those of us that fly large electric helis as well are using various server power supplies in series- personally I am using hp dps1200fb power supplies- usually you can pick them up on ebay that have been pulled from servers for 30 bucks or so apiece.. although the last pair, I got 2 for about $30- it is obviously a bit more diy.. but purchasing a comparable benchtop powersupply is way too costly.- in my heli charging case I have 2 in series for 24v 1200 watts- it is enough to drive a powerlab 6 and a powerlab 8. I have had both going showing a total of ~60amps on the charger side of the power supply.. with that setup, i can charge 6 6s 5000's in about 20 minutes on one charger and a bunch of either 3s or 4s on the other chaarger at the same time.
24v for the win! I run my isdt and ts100 off of a 24v psu. I get the whole 14a and the ts100 heats up in like 12 seconds :D 👍 👍
Which leads me into my favorite electricity joke.... Watts up Ohms! 🤣🤣😂😅😆😐😐😑😑😑
showed up to learn how to power my 80w turnigy
learned that my charger ain't shiit
still love this hobby u.u
This is why I went straight to using deep cycle marine batteries wired in series or 24V+ (sometimes adjustable) switch mode power supplies the day I began using a 'real' hobby grade charger which required an external power supply.. Once that HITEC 50W charger wasn't quite enough when I stared to fly helicopters larger than
Excellent!... JB. You are a Huge source of information for technical. You are a GOD for FPV community. Thanks for all your videos!
Very clear. Loved the explanation Joshua.
Joshua has done it again. Many others and I just learned something. No BS, thanks Bardwell...😎
ahh this takes me back to my car audio days when your buddys 2000watt crunch amp only had a 20 amp fuse and you laughed at him
I have a 12v 20a led psu and there is a knob to crank up the voltage to 14v. It supplies the desired 14a on the same charger :) Also it's important to use at least 16AWG wire not some crappy wire you find laying around. It cooks itself under that load and wont provide the those amps.
After watching the whole video, yes it only works if you are only charging 4s batteries.
Great info here and I almost missed this info if not for the Arrma forums before choosing another charger. I bought a used iCharger 4010 duo and an 12 volts 75 amp RL power supply due to the iCharger input limit being 65 amps! I can charge a 4s and one 6s 6000mah lipo in under 40 minutes at only 1c. Love it. All kinds of setups. Can tell it to storage charge or discharge to whatever voltage you want (I prefer 3.85v/cell). It will discharge or charge until it's done in just a few minutes. Can discharge at a high rate into light bulb bar or resister also. All with a 12 volt power supply.
Dear Joshua, from all the youtubers your content is the most precise and technical, it is great for people like me trying to understand electronics to get into te fpv. I’m an airline pilot and I’m making my own ground school before I fly ( like with regular aircraft), the info is very dispersed and to find something sometimes you have to be very specific on the search, or other times the info is obsolete due to new stuff.
It will be awesome if you make short videos about each part of the drone, there is a lot about radios and goggles, but when it comes to motors or blades or any other part is hard to find info when you are new. If you decide to make a virtual school showing rotors, amperage, speed, capacity..... specific things about each part, I will gladly buy it and I’m sure a lot of guys like me would buy it.
In aviation you have to finish the ground school before you go to the plane, and I’m trying to do the same stuff here but as I told, is hard to find info. I remember in flight school there was a company name Kings school, they are an old couple giving aviation lessons and I remember that there were like 40 dvd and each dvd was about an specific theme with precise info, if you have time, take a look of that and If you like it I will recommend you to do that with drones, and I’m pretty sure that a lot of people will buy it. Anyway thanks again for your content and sharing all your knowledge and as I said you are very technical when speak and make us understand .
It's always worth comparing different chargers amp ratings if you're charging 4S, From that point of view, the iSDT SC-620 was the best value at the time, and has a 24A input limit, that means the max output is 336Watts, the 12v 24a input limit is 288watts which isn't too bad really, if you have an old Computer PSU and want to spend less than $50 on a charger i'd really recommend!
Manufacturer should usually list the max input current from which you can calculate what is the minimum voltage required on the input to reach the max output rated power.
I couldn't find this info for your Q6 Plus, for my Q6 nano it was available tho.
Around 2008 I spent $250 bucks on a 50amp 12v server rack power supply and four Cellpro 4s chargers, all nicely mounted into a small freebie cordless drill case.. it still works perfectly today.
Xt60, xt30, JST, Deans.. does not matter..they're not even conneted to the charger. The Cellpro's are true balancing chargers straight through the balance tap.
Many planes, helis, buggies, boats.. and lipos.. have come and gone, but the charger setup is still here and its the best RC money I've ever spent, by far.
How much would this set up cost today?
Links to similar products to build this would be immensely appreciated. Thanks!
You have got so good at talking to the camera and explaining things in such an articulate way. Also great intro and outro! I unexpectedly watched the whole thing
Your conclusion is spot on, but there's a far simpler way of looking at the issue using Watt's formula that you present in the beginning (note: it's not Ohm's law). Input current is not a likely issue if you're power sourcing from a battery or external power supply. The supply or battery will be able to push more than your charger should be drawing, so in the end, you're likely only working with the voltage to scale things up or down for your charger.
That being said, beware of power supplies that may be imbalanced in a direction that's not useful for you. There are 1000 watt power supplies at 12v@85A, but some power supplies will not make use of 85A. If your charger only accepts an input of 30A at 12v-28v input range (making it an ~850watt charger), that power supply can only give it 12v@30A which is 360 watts of power. Terrible! If you had a 600 watt power supply of 24v@25A, you'd could actually get the full 600 watts. Both variables matter, but voltage is normally the one you want to be on the upper end of for your charger, and you could fall short of, or exceed the current ratings of your power supply as needed and it won't really matter much.
If you're plugging a charger directly into a wall socket, you're dealing with AC power @120v US and 240v for most of the rest of the world, you need an AC->DC conversion and will yield a very different power rating for any charger so read up on those specs separately.
On a related note, if you are driving to where you are flying (or don't mind carrying a bit of weight), rather than getting a "big" S6 RC Battery pack at like 10,000 mAh you can get a battery for a camping trailer or RV - There are old style Lead/AGM/Gel type batteries (same tech as a car battery) but there are also Li-ION versions, which however are more expensive. I have the latter, it's a "S6" (25.2V) pack, about 25x20x30 cm in size and weighs 3 kg. It has a capacity of 110 Ah, meaning 110,000 mAh! You're going to have to rip quite a few 1550 mAh packs before emptying it, and since it's 25.6V you can charge a lot of packs at the same time at full current. The Li-ION packs are pretty expensive, but you can get a traditional 24V pack of 100-130 Ah for something like $200 and the chargers for these are not that expensive and you may already have one for your car., You can of course also hook it up to your car to charge it while driving, that is not an option with the Li-ION variants.
Another thing that may become big in a couple of years is to utilize your car - that is if it's an EV. My car is a plug in Hybrid and I hijacked the HV system that runs drives the car. Fully charged the battery pack of the car carries 16.8 kAh - a whopping 16.8 million mAh. Even if you charge 100 packs from it you won't notice it on the car range. And should you be low the charging circuits of the car are massively powerful allowing you to convert gas into charge almost instantly from an RC perspective. Like I said, these are not what everyone is driving today but in some years maybe they are and for an engineering geek it's an excellent challenge to make this system accessible.. The fact that it involves circuits at 40.000 Volts with enough current to kill ten elephants just makes it more interesting.
I just love your sense of humour. Kudos.
Great as always Joshua:); following your math for the ISDT T8 "Input Amp limit 35 A" so times 24 volts = 840 Watts
we appreciate what you do for us Josh, Thank You. Cool ending too!
Thank you. Although it's not ohms law but Watts law 😅
At least of 2020, most lipo chargers capable at 15amp and above, require DC input (a power supply). Most users don't require that kind of amperage. But some of us will charge 25-30amp single or 50-60am dual, especially people who frequent race tracks.
That will require 1000w+ power supply. Can get cheaply using server power supply, with some soldering.
ISDT P20 have 35A input limit and 1000w so it needs at least 29v psu. with S-600-32 you can power most isdt models
something else to consider. Some chargers work below 12 volts while others do not...
My ISDT T8 will not work under 12v. This can be problematic if charging off a lead acid AGM battery, as soon as it sags below 12v the charger may shut off. Which means charging 4s Lipos, nearing 16V at 5amps you will be pulling a lot more than 5amps from your 12v supply. As your source battery sags you will hit that voltage limit more quickly.
Wire in series and be on a 24v system and you are good to go. Pulling less amps from 24v while being able to not worry about battery sag on the input side.
I kinda messed up on my portable box when I bought my powersupply. Did a 12v 600w setup but I keep it pegged at 13.8-14v and on a 10amp output charge I see the power supply sag to around 12.6v. If I ever rebuild I will use a 24v input.
A great explanation, most people get lost in the math.
I use a Q6+ and a T6 Lite , both ISDT, from a Banggood 360W, 24V supply. The best thing is both these chargers show exactly how much they are drawing, in watts. I've never come close to 300W, never mind 360W. Even in all day flies, I can keep all my packs happy, without worry.
What a helpful video. I"m in the market for a new charger because my old one couldn't handle my 6s battery even at 1C. The charger is 6s capable but only at much lower amps. Crazy how misleading most charger specifications seem now that I know the math. Thanks for the info.
Even your most boring videos, such as this one, are still entertaining enough for me to watch on my lunch break and informative enough to make me say "wow I learned something".
Oh i definitely learned something today! you just confirmed what happened to me with my newly converted 650 watt PC power supply and ISDT T6 lite. Using an old hard drive to provide a load so the PS can operate at full power until I can solder in a 10w 10ohm sandbar resistor. I didn't realize it was an input voltage /watts that was causing the restriction.
T6 Lite has something like 20 amps input current so it can do better than the Q6 in this video.
thank you very much, JB, please stay safe and healthy 🙏👍❤️🥃🥃
Thanks for the info Joshua! I was just about to get enough batteries to max out my charging board so this will help immensely!
Good info - even for us "fixed wing flyers" who watch your channel 🙂 Since I fly 4S 5000 mah batteries and have a power supply that has two output ports 12V @ 14 Amps each (29 amps total), I don't think I'll be trying to parallel charge multiple 4S 5000 mah batteries with my current setup.
All the best to u guys. Enjoy. That's wat life is about. Great vid. Helped me understand a lot
Subscribed. Thanks for the clear explanation on how everything works.
it’s so true what you say, that ISDT made its own PWS with voltage output of 27 V. it’s not a random choice.
RC & quads are really alot of good education & information. Thanks!
THANK YOU MAN!!!! BRAND NEW TO ALL OF THIS!!! your explanations made perfect sense! Now off to buy a charger and power supply
Thank you, this makes a lot of sense. I was trying to figure this out almost a year ago and ended up getting an iSDT T8 and a 750w 12v server PSU. Input from that PSU is ~422w (35*12=420) and output is around ~396w. If I'm understanding right when it comes to the ISDT T8 for 4s batteries 35*16.8=588w, so I guess my charging situation is not the best that I thought ... but also not the worst either. By pure luck, it just works for what I've been using it for (10x1300mah 4s at 1c or 2c... on a JB strix board ;)) If I had a 14a input limit... YIKES.
Great video! I learned something today... again. Seems like a bad habit when I visit this channel. I'm getting to a point where I'm gonna need to start dumping less desirable knowledge in exchange for Bardwell knowledge.
Look like you're having a awesome time..Thanks for taking some time out for us
Excellent video. Just so happens that I am in the market for a power supply for that exact charger.. THANK YOU!
On q6 lite it says max input current 12a. Is there any problem providing more current than that. My power supply is 24v 15a
Current is dictated by the load not the supply. The charger stops pulling at 12 amps. The PSU is capable of supplying up to 15 amps.
phenomenal explanation! Very easy to understand and follow. Thanks
As always, very good, VERY informative. You made a 2 minute video into a 10 minute video but not in a bad way, but in an epic way!
Besides what law it is, it was explained well. Thank you sir.
Joshuas bed is electrifying 😅
Here is your issue; you were correct in stating you can't have both... in all cases. Your amps are limited by max watts but this has nothing to do with your power supply.. if your power supply can give the matching draw amp/watt that your charger max's out at there is no chance it's the limiting factor no matter your voltage supply 12/24. What limits a charge amp draw is the watts but it's based on the lipo's voltage... the higher the voltage the more of a potential limit you have. Say the lipo is a 6s pack.. your max amp will always be 13.5amps with a 300watt charger... no matter what supply voltage you throw at it, the charger and PS maybe capable of 40amps but the only way you are doing that is at 2s or get a bigger charger :) 300/22.2=13.5 300/7.4=40.5
No, you're still missing the point. The point is that there is a totally separate restriction, which is the input amps on the charger.The charger will throttle the output once the input amps hits the limit.
If the charger's max input current is 20 amps then the max output it can possibly provide at 12v input is 12v * 20A = 240 watts. This limit is completely independent of any of the other specs of the charger, such as output watts or output amps.
A responsible charger manufacturer could design the charger so that it can reach max output power on 12v input, and some chargers do this, such as the ISDT T8, the iCharger X6, and others. But many manufacturers don't do this.
@@JoshuaBardwell even in your example in the video if you plugged that isdt into a reasonable 12v powersupply, that could do over your max need it would work.. nothing to do with your charger and input voltage... 300/14.4= 20.8a but your charger is limited to 14a so the max it will ever do on those 4s packs is about 200watts, so if you had a 12v ps capable of over 200watts and over 14a's it will work with out issue.
I would highly recommend an Altronix power supply over other brands. We use them for nearly all of our panel builds in commercial and industrial environments because they nearly last for ever. They are also made in the USA. I’ve been using an Altronix 6amp 24vdc for charging my lipos.
Thanks Mr bardwell for another great informative videos
thanks
I have a flex power tool with 24V battery but no charger. I would like to know if I can use some kind of setup to charge this 24V battery which I think needs something slightly higher than 24 volts to charge. Thanks.
Hi josh, i found explaining ohms law easy if you use speed time and distance, its clear if you change one, it effects the others. also using a triangle, you can cover the one your trying to calculate.
Hello JB, This was a really helpful video. Thanks JV 😎
Great video! That little bit of math was making things so clear. You saved many hours of charging time with this story :-) Also explains why my 6s field charging lipo is doing such a great job.
Now if I’m at the field. And running a 400 power inverter to the 24 v 400 watt power supply . Would that work or would the inverter need to be a1000 watt. Thanks
TLDR you should use max volt-in to get max watt-out, you don't have to use 24v if you don't need or want the full output
Great video! Alot of help.Thanks
old vid but just wanted to thank u for the very well explained info. news to me as i was debating on a 150 or 300 watt but will most likely use 12v so 150w now sounds better and will save me a lil money. thanks
Think I learned something today
i have been using my thunder power 820 charger for 9 years she came with me from 3Dhelis to my quads and still works like its new . the charge is 800 watts 20 amp 2 charging ports and my maxamps 24 volt power supply
Great info JB! Like the light hearted bit at the end@👌👌😀🏆
That is why you should use multiple Q6 Lite over the bigger 300W Q6. Also you don't have to watch for having all packs at the same voltage. Using 3x Q6 Lite on xbox360 power supply (the biggest one) I never had one case where I need to wait for one "voltage cluster of batteries" to be finished before charging others.
The input range of the iSDT Q6 Plus is great, I can run mine off my 7S ebike battery, allowing the full 14A output for parallel charging.
Hi there, informative video, is this the right product on bang good? Would this power supply be able to power the ISDT Q8 Lipo battery charger? I'm looking for a power supply for the ISDT q8.
Hi! I really have a question! I have 2 ISDT chargers. 1 that is 500W 20a and the second 200W and 8a but when it comes to charge batterie the first charger always stays at 0 amps and 0 mah after starting and the second chargers start charging and the amps are going up but then “abnormal input voltage”
Power supply is 400W 24V 16.6a
Please help me out!
Thanks a lot and keep the amazing work!!
Everything you said makes sense to me. But i cant figure out why my hobbymate d6 charger wont charge my laptop past 1 amp at 19.5v. Its plugged it into the cigarette lighter in my car wich i know can supply at least 15 amps. Now some laptops can be tricky to charge without an oem charger but ive managed to do it with the d6 charger from a higher voltage. It really seems like i need a better charger... Any thoughts or knowledge is greatly appreciated.
Thanks Joshua for interrupting the quadworld's blastyness for our education!
And now get the hell out and have loads of fun!!
Good info. Also note, ISDT T6 Lite is 30A input and T6 and T8 are 35A input. Being pragmatic, at 14A I can parallel charge 8 1500mah batteries at 1C. I would be curious to know how many flyers actually do that.
You've convinced me. Actually I was on board with this before from your previous videos. I've got my server PSU based power supply build already in progress. 24V, 870 Watts baby yea!... :)
I know you've said you're reluctant to do a video on stacking two 12 volt server supplies as a 24 volt supply, but maybe for a limited audience, like, say, Patreon members?
I use a dell laptop charger as my power supply. Rated at 19v, not 24, but can be found cheap second hand.
Unfortunately it probably maxes out around 70 to 140 watts.
@@JoshuaBardwell Yep. 130watts to be exact. Good enough for my situation . But true,not using the full potential of the charger. Cheap and silent solution though.
Is it suitable to power ISDT Q8 to charge Lipos with a Li-Ion 24V Battery 20Ah? I ask for it overall for the discharge ratings. some recomendations?
I have a 24 volt 1700 watt power supply. I also have a isdt T8 charger. In the future I’ll be running two chargers off this power supply. My question is will this power source hurt the charger? I think output is like 70 amps but not sure. Is it possible to over power the input side of a charger?
Stinger gettin buckkk
Even tho my boy f'ed up on Ohm's law. Why isn't this guy over 100K subs yet. Still killing it with the knowledge everyone needs to know. I still love my laptop power supplies to do this job. Typical can get 20v @ 3 to ~5 Amps... Not going to get 300Watts, but a good 80-90Watts with ZERO noise. I then don't parallel charge and just run many iSDT's off laptop PS's. Zero noise = Happy wife... Talking to a guy that owns a PowerLab8 1300W Charger.
But always wanted to know if i could hook up these Laptop power supplies in parallel to get 20v @ ~10amps @ zero noise.
Yes it's doable but even with identical PSUs I'd use 10A diodes to stop one supply from back-feeding current or transient spikes to the other.
I have a M600 Toolkitrc 150W max input 28v 12a lipo charger. So its safe to use 26v 16.5 amp power supply??
I have the Dynamite Passport P2 which has a DC input rating of 11-18V. Would one of those work?
Thanks for this, it’s something I feel I should have guessed as my Turnigy chargers only ever push out 3.2amps * 16.8v yet they says they are 300 watt, just presumed they were lying like car manufacturers do for mpg!
Anyone know how noisy that charger from Banggood in the description is? I had a 12V unbranded Chinese one like that but it was so noisy I switched to a lower output laptop PSU.
Great thanks man
Joshua, what is your Recommendation, for a AC to DC Volt/Amps Charger for the " ISDT Q6 Pro BattGo 300W Charger". I 'm looking to charge mostly 3s 5000mah batteries 2 at a time? Any help is appreciated.
Thank you - it was very useful. I was using modifyed laptop charger to supply q600 plus to charge not more than 3-4 batteries, but now I'm having more batteries and I was looking for new power supply - this video was right in time! And Hey - I already have your JB v2 board - it's smells power muahaha!
I always check all the charger specs before I make a purchase.
Well explain thanks for sharing.
Worth mentioning the T8 1000w needs more than a 24v input. It has a 35A max input, so 24v x 35A = 840w.
Need 29v at least and it only goes up to 40v input too.
What's the voltage you get out of a home outlet? Isn't it 110V?
I'm sure I'm missing something that will explain why a regular outlet is not enough.
Opps, the 306B is 1000W and runs 500W on 12V, the GT1000 is 1000W and 408W on 12v.
Great video thank u for the info.
That was the truth
I’ve been looking for something (not very hard) to replace my XT60 spliced laptop power supply (it runs at a measly 16v) that I used for the ISDT Q6. Looks like this is the solution. Thanks JB! 👍🏻
Thanks, this is like the 5th time I watched this
Look into icharger 65 amp input limit on there 4010 and upto 50volt input i have 2 of these setup they are total work force chargers
god damn... that's why I use 250W 16.5A supply, its output is 15.1V*14A = 211.4W = 16.8V*12.6A... you're correct.
Hey Joshua here I go again with one more doubt. By the way that issue with that similar isdt lipo charger that I told you about it is solved my local dealer send me another one brand new, thanks for the advice. Now I noticed that the lipo charger reaches 52+ degrees Celsius when powered with a 6s lipo battery much more than when it is powered from a 12v dedicated power supply. Can you give some explanation for that. Thanks once more.
I realized this when I bought my ISDT charger and saw people recommending a 12v power supply. Batteries are over 12v so I knew that would present a problem so I got a 24v supply.
Stepping up the voltage is no problem. Just the input current is a problem.
nice explain! thx :)
JB, you over work yourself! Go play and have fun some! You deserve it!