atomicthumbs
New Member
I work at an e-waste recycler and have acquired several dozen of these Batteryspace 611wh 4S lithium packs (a slightly different version, CU-JAS466, without the SMbus wiring present). They're very lightly used.
I'd like to use these as-is to supply both AC and DC power. My two problems are:
The boards on the packs are these, I believe.
The way I see it, these are my options:
I'd like to use these as-is to supply both AC and DC power. My two problems are:
- they're 4S packs, and almost nothing except a Victron inverter or wide-range buck-boost converter will take that voltage
- they max out at 10A each and I want to run more than 10A of equipment
The boards on the packs are these, I believe.
The way I see it, these are my options:
- Find or build ~7-8A (for derating) 12v buck converters for each battery, with a current share bus to split the load properly; this would result in a fully modular system and seems like the ideal... if anyone makes prebuilt equipment for this. Learning PCB design for the first time for something that can burn down my house or a forest if I screw up seems ill-advised
- Parallel the batteries directly (with diodes? I'm uncertain of proper procedure for paralleling batteries with a BMS already installed, and I haven't yet put them on a battery analyzer to figure out how closely matched they are) and use a stepdown regulator for 12v
- Series the batteries directly - the specs for the PCM I found in a battery I opened up doesn't indicate anything about this, but the MOSFETs are HY4008s rated for 80v
- Peel the boards off the packs, analyze the batteries, and turn them into 8s or 12s packs (not certain this would be any more useful)
- Bite the bullet, dismantle the packs, and build bigger packs in another configuration with the INR18650MJ1 cells
- Partially bite the bullet, and partially dismantle the packs into 12P strings, then build several bigger batteries out of those
- Give up, sell the packs, and buy LiFePo4
Last edited: