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Old 12-20-19, 04:08 PM   #14
Robaroni
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Quote:
Originally Posted by wlbryce View Post
Great Job, But, you still should use a BMS. The BMS is not just for balancing, it is the safety for the battery bank. Inverters and especially charge controllers are not foolproof in regards to the charging and DOD control.

The BMS, will insure that you do not overcharge or over discharge the battery.
It not just good practice but its adds a level of safety for the battery bank.
Overcharging LA battery just ruins the battery but over charging Lithium even LiFE chemistry might end with a diffrent result.

Logan
instagram. com/wlbryce
Logan thanks for the input.
I originally designed the system with BMS in mind but the Outbacks are so good that I don't need it. I cycled through a few charges running all my critical loads. with no problems.

What I did was to set max voltage to the bank at ~3.400v per cell. The data sheet shows the batteries to be very stable at under 3.600v so I even took an extra measure of safety. Also I cut the batteries off at ~3.00V cell which is well above critical. Internal battery resistance is very stable at these voltages. In fact the differential is under 40mV for the 16 legs.
LiFePo4's are the best batteries around for off grid and backup, really bullet proof.
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