Battery Life Calculator
Calculate battery life in hours. Enter capacity (Ah/Wh), load power, voltage, depth of discharge, and efficiency to find runtime.
battery discharge calculator
To estimate battery life, one needs to first convert battery capacity to usable energy. Multiplication of ampere-hours (Ah) by voltage (V) and depth of discharge (DoD), and efficiency is used. Divide by the load power in watts, then. The output provides approximated hours of run-time.
Formula & Table Summary:
Usable Energy (Wh): E = Ah × V × DoD × η
Battery Life (h): t = (Ah × V × DoD × η) ÷ P_load
Reverse (Required Ah): Ah_req = (P_load × t) ÷ (V × DoD × η)
battery usage time calculator
The calculation of the time period that a battery can support a load before needing a recharge is done using a battery life calculator. Run time in hours will be calculated by entering some battery capacity (Ah or Wh), system voltage, load power, depth of discharge (DoD), and efficiency. The tool can be applied to the backup systems, solar systems, electronics, UPS, and EVs. The formula is based on the available energy = Battery Capacity Voltage DoD Efficiency. This energy, divided by the load power, will achieve the expected run time. Divide system losses, inverter efficiency, and DoD restrictions to avoid excessive discharge and lengthen battery time.
battery runtime calculator
| Battery | Load (W) | Voltage (V) | DoD | Efficiency | Life (h) |
|---|---|---|---|---|---|
| 12V 100Ah | 100 | 12 | 0.8 | 0.9 | 8.6 |
| 24V 150Ah | 300 | 24 | 0.85 | 0.92 | 10.4 |
| 48V 200Ah | 500 | 48 | 0.9 | 0.95 | 16.4 |
| 400V 62Ah | 2000 | 400 | 0.9 | 0.9 | 12.5 |
