If each pack has it’s own BMS and I charge with a Laptop (42v - 2Amp) charger, if they are connected in parallel If i just plug into the charge port of one setup, i assume the other will not charge properly as the BMS is connected to it’s own charge port? Or once in parallel it will charge properly? thx
Sorry if I wasnt clear, still trying to wrap my brain around things. The board originally only has a single (10s1p) with charge port. I would add a secondary 10s in parallel giving me 10s2p. Once the second battery pack is in parallel, could i charge both through the original charge port, or would i need to charge them separately? thx
I second the request for photos, but you should be able to connect the charge port wires and battery output wires in parallel. HOWEVER, you MUST make sure both packs are at the exact same (within 0.1V, or within 0.05V if in the 35-39 range) voltage when you connect them together. This is important. Easiest way is to charge both of them until green light with the same charger, one after the other. Another way is to connect the positives together first, then put an old-style incandescent automotive light bulb between the negative (B-) connections until the voltages are the same.
It will, it will just take longer. Many people do this. Even if you search for ebike batteries and power walls they do it. I was watching a video just yesterday of a guy that connected the same batteries as meepo use together in parallel to make a mini power wall to power an inverter. It’s the same concept