costa
Hithium_280AH TDTbms_6032 MasterPower Omega3 5kw
Hi, got a new battery box with claimed 16x280ah Hithium lifepo4 cells.
I did around 4 full charge / discharge cycles to test the capacity.
I have a 5kwh hybrid inverter what can show the solar charging input and the generated power to keep the house running.
The output (lower number) in kwh is identical with an energy meter what collects the power usage from the whole house.

The battery capacy test I start from 100%, all cells are over 3.375v (54.2v) and stop when the bms or the inverter turns off. That is around 42.3v
The maximal of power I can draw is 12.5kwh.
To recharge to 100%, the charge is up to 56v when the bms ovp kicks in and the balancers do their thing, 16.5kwh are used from the solar cells. The system has a tdt bms-6032with an additional red active balancer. After good an hour passed, the battery is down to 54.2v and the balance is down to 20mv cell difference.
The MF-OMEGA-UM5kV3 inverter has a claimed peak efficiency of 93%
From all the test I see, the charge and discharge should be identical.
Why 16.5kwh in and only 12.5kwh out? are the losses so high?

I did around 4 full charge / discharge cycles to test the capacity.
I have a 5kwh hybrid inverter what can show the solar charging input and the generated power to keep the house running.
The output (lower number) in kwh is identical with an energy meter what collects the power usage from the whole house.

The battery capacy test I start from 100%, all cells are over 3.375v (54.2v) and stop when the bms or the inverter turns off. That is around 42.3v
The maximal of power I can draw is 12.5kwh.
To recharge to 100%, the charge is up to 56v when the bms ovp kicks in and the balancers do their thing, 16.5kwh are used from the solar cells. The system has a tdt bms-6032with an additional red active balancer. After good an hour passed, the battery is down to 54.2v and the balance is down to 20mv cell difference.
The MF-OMEGA-UM5kV3 inverter has a claimed peak efficiency of 93%
From all the test I see, the charge and discharge should be identical.
Why 16.5kwh in and only 12.5kwh out? are the losses so high?
