What is Battery capacity?
Battery capacity (Ah)
How long it can supply that load.
Short answer
150 Ah tubular is the common sweet spot for 3–4 hours of fans and lights.
Battery capacity when buying a home inverter & battery
How long it can supply that load.
Why it matters: Backup hours ≈ (Ah x 12 x 0.7) ÷ load in watts.
Look for: 150 Ah tubular is the common sweet spot for 3–4 hours of fans and lights.
Full Home Inverter & Battery buying guide