150 Ah battery backup time
Estimate how long a 150 Ah battery may run selected appliances after voltage, usable battery share and inverter loss are shown clearly.
Ah alone does not tell runtime
Amp-hours describe battery capacity at a stated voltage. A 12 V, 150 Ah battery begins with a different energy figure from a 24 V, 150 Ah bank. Appliance load, battery condition, discharge limit and inverter efficiency also matter.
Use usable energy, not label total
Start with volts × Ah for nominal watt-hours. Reduce it by usable depth of discharge and inverter efficiency, then divide delivered energy by the real appliance load in watts.
Treat it as a planning range
Battery age, temperature, cable losses, charge level and discharge rate can reduce runtime. Test safely with your actual equipment before relying on it for an important need.