diy solar

diy solar

Lipo4 battery storage

Sik-wit-it said:
Hello I have one more question before I rearrange my battery so you don't think the 24v 100ah batteries will drain first and shut my inverter off being the other batteries is 400ah I think the 100ah will drain first and shut off unless I set the charge controller not to let the batteries drain that low but then I will be loosing ah from the batteries especially the ones that's 400ah I wouldn't get near close draining them down being they hooked up with the 100ah am I correct?
Click to expand...

Batteries in parallel are always at the same voltage. Once capacity drops in battery 1, it's voltage drops, which shifts more of the load to the battery 2 with more capacity because it doesn't have as large a voltage drop. If there is any voltage difference between the batteries, current will flow from the high voltage battery to the low voltage battery. Under load, this will simply be an uneven outflow of current from the batteries, not transfer between them.

The ratio of how they drain may be variable and a little erratic, but you will have 600Ah of usable capacity. Once you get to the lower end of it, you may experience greater voltage drop and may not tolerate heavy loads as you would with a single 600Ah battery.
 
billvon said:
Warning! LFP batteries are NOT compatible with lipo (NCA or NCM cathode.) They use different voltages and will not have the same OVP and UVP setpoints.
Click to expand...

Subject and OP clearly indicate a different intent. Lipo4 suggests a simple typo rather than an intent to run LiPo cells.

Otherwise, I would have whipped out the pedantry too. :p
 
Last edited:
sunshine_eggo said:
Batteries in parallel are always at the same voltage. Once capacity drops in battery 1, it's voltage drops, which shifts more of the load to the battery 2 with more capacity because it doesn't have as large a voltage drop. If there is any voltage difference between the batteries, current will flow from the high voltage battery to the low voltage battery. Under load, this will simply be an uneven outflow of current from the batteries, not transfer between them.

The ratio of how they drain may be variable and a little erratic, but you will have 600Ah of usable capacity. Once you get to the lower end of it, you may experience greater voltage drop and may not tolerate heavy loads as you would with a single 600Ah battery.
Click to expand...
Thank you
 
Sik-wit-it said:
Thank you
Click to expand...
What size DC breaker do I need for 24v 100ah battery ?
What size breaker will I need for the 12v 400ah batteries that will be in series 24v ?
I'm going to use busbar and put a DC breaker on each battery positive that's going to the busbar to protect each battery for over voltage ⚡
 
The voltage difference between the two different battery chemistries will cause quite a bit of current flow for awhile. Size your breakers to less than the batteries BMS's, providing you have BMS's on your batteries. Some of your batteries are going to suffer from your experimentation.
 
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