Battery Bank Capacity
Calculator
Results
- Bank voltage (V)
- 48
- Bank capacity (Ah)
- 200
- Bank energy (Wh)
- 9,600
- Total cells
- 8
Electrical results
| Bank voltage (V) | 48 |
| Bank capacity (Ah) | 200 |
| Bank energy (Wh) | 9,600 |
| Total cells | 8 |
formula-map diagram
- Bank voltage (V)
- 48
- Bank capacity (Ah)
- 200
- Bank energy (Wh)
- 9,600
- Total cells
- 8
Electrical relationship
Formula
V_bank = V_cell × n_series ; Ah_bank = Ah_cell × n_parallel= 48
Note
This is a simplified model: it applies the textbook relationship to the numbers you entered and assumes ideal components, steady-state sinusoidal conditions, balanced loads and copper resistivity of 0.0172 Ω·mm²/m at 20 °C. It ignores component tolerances, temperature drift, skin effect, harmonics, inrush, transformer and battery losses, and it is not a substitute for the wiring code that applies where you are. Have any installation sized and verified by a licensed electrician or engineer.
More in Electrical engineering
See all →Frequently asked questions
How is total battery bank capacity calculated?+
For batteries in parallel, capacities (in amp-hours) add directly: total Ah = Ah1 + Ah2 + ... For batteries in series, capacity in Ah stays the same as a single battery, but voltage adds instead.
Why does series wiring increase voltage but not capacity?+
In series, the same current flows through every battery, so the amount of charge (amp-hours) that can be delivered is limited by a single battery's capacity — but each battery adds its own voltage, so the voltages stack.
Why does parallel wiring increase capacity but not voltage?+
In parallel, all batteries share the same voltage since they're connected across the same two points, but each contributes its own current, so the total charge available (Ah) is the sum of all batteries' capacities.
How long will a battery bank power a given load?+
Approximate runtime in hours is total Ah divided by the load's current draw in amps, though real-world runtime is usually shorter because capacity ratings assume a specific discharge rate and batteries lose some usable capacity at higher discharge currents.
Should I mix batteries of different ages or capacities in a bank?+
It's best avoided. Mismatched batteries in series or parallel charge and discharge unevenly, which stresses the weaker battery, shortens the whole bank's life, and can even create safety issues in some chemistries like lithium.