Formula for SoC:
SoC (%) = (Current Capacity (Ah) / Total Capacity (Ah)) * 100
If the current capacity is 50 Ah and the total capacity is 100 Ah:
SoC (%) = (50 / 100) * 100 = 50%
Formula for DoD:
DoD (%) = 100 - SoC (%)
If the SoC is 30%:
DoD (%) = 100 - 30 = 70%
Formula for Battery Capacity (Coulomb Counting):
Q = ∫ I(t) dt
If a constant current of 10 A is drawn for 2 hours:
Q = 10 A * 2 hours = 20 Ah
Formula for Energy Consumption:
Energy (Wh) = Voltage (V) * Current (A) * Time (h)
If the voltage is 400V, the current is 50A, and the usage time is 1 hour:
Energy (Wh) = 400V * 50A * 1h = 20000Wh = 20kWh
Formula for Internal Resistance:
Rint = (Vno-load - Vload) / Iload
If the no-load voltage is 400V, the load voltage is 390V, and the load current is 50A:
Rint = (400V - 390V) / 50A = 0.2Ω
