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How to charge/discharge packs
#1
hi gents,

does anyone have any recommendations for pack testers?

I need something to be able to charge my packs (12v - 48v), I'd also like to be able to do capacity testing on them if possible...
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#2
Icharger DUO 4010 can do up to 10s testing directly and is my first choice for testing larger packs!  I have also done videos about doing resistive loads to it.
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#3
(05-16-2018, 06:19 PM)daromer Wrote: Icharger DUO 4010 can do up to 10s testing directly and is my first choice for testing larger packs!  I have also done videos about doing resistive loads to it.

ah yes ive seen you guys talking about this brand a lot, quite pricey, I'm guessing i wont find anything sub-150usd that can do 14s then?
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#4
What i know there is nothing out there that can do 14s as a whole tester for sub 1000USD. Also note that it only test the package as a whole and if you want each individual packs tested you need to test them one by one.
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#5
(05-16-2018, 07:28 PM)daromer Wrote: What i know there is nothing out there that can do 14s as a whole tester for sub 1000USD. Also note that it only test the package as a whole and if you want each individual packs tested you need to test them one by one.


oh yeah fair point, guess i'd rather do the single placks at once... soooo.... a good 1s tester? Big Grin

though what do you do if you have say 14s packs for e-bikes...? i guess you plumb a 1s charger into the balancer attached to the packs?
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#6
Yeah, you use the balance leads to do the testing. Just make sure you get the right 2 wire pair that you get only 1 cell. Altho, you will probably get 1sXp that way if you don't take the packs apart. This is fine, sorta. First, the capacity test will take a longer time. Second, you won't be able to test if a cell is leaker or weaker than the others.

The ZB2L3 (ebay) is a good dis-charger as you can set the voltage limits and amp limits
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#7
It depends on what you expect. Do you want high currents for charging or discharging/testing? Powered by DC or AC or both? Combined charger/discharger or separate units? Budget, 150 USD? That's almost nothing if you don't aim low with your expectations.

14s charging can be done with a rather cheap charger but 14s balance charging, if that is what you want, can only be done with very few chargers. Actually I only know one off the top of my head that does it, the Pulsar 3. Depending on the version it will cost between 600 and 900 EUR, probably like 700 to 1100 USD.

14s discharging is probably even more rare. You could DIY a suitable device, for example with an inverter or any other DC load and a power meter. Testing individual cells of the battery makes it a lot easier but you also have to do the process 14 times instead of just once. The balance port can be used but only with limited current obviously.
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#8
Hi,
A friend and i got a large bunch of leadacid batteries from a fork lifter, which we want to test now. We are bundling them up to 24v, which we are capable to charge via a 24v truck charger.
For discharging batteries we developed the following approach:
1. I ordered a wattmeter of this kind: https://www.aliexpress.com/item/Multifun...57827.html
You can set cut-off voltage and some other parameters easily and it also has a relay which turns off, when cut-off is reached.
2. I ordered 24v 250w lamps and put 3 in parallel, which leads to nearly 30A draw.
3. wire all up, define parameters and turn on as long as cut-off is reached
4. read capacity drawn from battery.

When you are capable of charging higher voltage you can handle nearly every battery that way. Lamp was the cheapest load for me, i also considered an inverter but this was too expensive just for the testing purpose.

Hope this helps and gives an idea.

Regards
Karl
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#9
thanks for your answers all, i have ordered an iCharger 206b and will test packs individually or do it as 1s via the BMS.
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