I am starting my story about this storm Milton and operating off-grid for six days plus.
42 kw of LiFeP04 280ah cells. 3 banks of 17 cells each. XW6848 Pro and other grid-tie inverters
After six days my biggest hassle is the cell imbalance as I recharge the cells.
I have 2 amp JKBMS on each bank of cells. It cannot keep up with the balance needs when each bank is recharging at 35 ot 40 amps.
I prefer not to let any cell go above 3.4 volts.
On Sunday morning I did find 'the weakest link' in the batteries. Had a cell that was down to 2.5 volts and had to remove the discharge path from that bank to protect it integrity. We don't want any cells heating up or deforming and expanding. So that charge rate appears to be at most c/8 and slow enough to be safe. Fire is the number one enemy in this whole mix.
Daytime loads include:
Well Pump, 1 hp
Running a pool pump, 2 hp
hvac units, 2 kw each
1200 watt water heaters
Charging of the Lithium batteries
At times I see 12 kw coming in from the sun and charging at 4 to 5 kw, managing other loads accordingly.
42 kw of LiFeP04 280ah cells. 3 banks of 17 cells each. XW6848 Pro and other grid-tie inverters
After six days my biggest hassle is the cell imbalance as I recharge the cells.
I have 2 amp JKBMS on each bank of cells. It cannot keep up with the balance needs when each bank is recharging at 35 ot 40 amps.
I prefer not to let any cell go above 3.4 volts.
On Sunday morning I did find 'the weakest link' in the batteries. Had a cell that was down to 2.5 volts and had to remove the discharge path from that bank to protect it integrity. We don't want any cells heating up or deforming and expanding. So that charge rate appears to be at most c/8 and slow enough to be safe. Fire is the number one enemy in this whole mix.
Daytime loads include:
Well Pump, 1 hp
Running a pool pump, 2 hp
hvac units, 2 kw each
1200 watt water heaters
Charging of the Lithium batteries
At times I see 12 kw coming in from the sun and charging at 4 to 5 kw, managing other loads accordingly.
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