Another type of BMS

Korishan

Korishan

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Hmmm, was looking for lithium batteries for power tools (to build up my current packs capacity; another build) and I came across this:

http://www.ebay.com/itm/5S-18V-20A-...ect-Circuit-Board-For-Tools-Hot-/192257555529

It's interesting as it only costs ~$2.50 and does balancing on 5s. A pretty cheap solution for 18v setups. Overvoltage, overcharge, overdischarge, overcurrent, short circuit, and temperature protection.

Anyone else thought of using something like this? Now, I know it's for power tool type batteries and the voltages are a bit different. However, for those who are wanting to build packs for lawnmowers, go-carts, etc., this might be an interesting choice.
 
Nice. I think I can use that for my 18v Bosch drill. Drill works great, but the last NiMh pack I've got is useless.
 
Darmok said:
Can anyone recommend a 4s board?
Click to expand...

Damn good question, have been searching around for an answer to thismyself.
If I find anything that looks promising I'll let ya know.
 
I have been using this one before in packs built. it works but you get what you pay for. The balance current is small = you cannot fast charge the cells at all.

Ebay link: https://goo.gl/eAsdZr
 
Daniel did you do a video of the eBay BMS? I've got a 6 of them. I had trouble with the first one then gave it up. I'm keen to revisit it. I'm happy with its basic functionality if it works.
 
The ones I have used worked fine. I only had 1 video about a 3s board but nothing spectacular there. Only when i hooked it into my Bluetooth speaker box i built.
 
What charging voltage do you input to the board? 16.8?

I have 120 cell 4s packs that I use for camping. Currently they are charged and balanced with a 20A RC charger. I would like to be able have to set them up on a solar charge controller and utilise one of these eBay BMS boards for management.
End use is camping power supply running a 12v fridge, camp lights, portable devices, phones and cameras.

Also did you put any cell fusing in your packs? I haven't and just keep a very close eye on them. They have pack fusing just nothing at the cell level.
 
its a 3s system and i use an normal 12VDC adaptor. thats 4V per cell. And when any of the cell gets above the BMS should balance. Ie if they go above 4.2V.
The cells are 2nd line cells i had. Ie around 1500mAh that i dont use in my powerwall.
I keept it simple so no fusing between cells.
 
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