Calculation
t = U · Q · η / P
Runtime = usable energy / load power; efficiency and reserve reduce theoretical time.
E = P·t
Battery runtime at a defined load
Runtime = usable energy / load power; efficiency and reserve reduce theoretical time.
MINTSI
02
Result
Select a target and calculate.
Technical principle schematic
Understand the inputs
- Runtime t — Theoretical supply duration at constant load.
- Average battery voltage U — Average voltage during discharge.
- Capacity Q — Rated capacity; usable fraction is represented by efficiency.
- Load power P — Electrical input power including continuous auxiliaries.
- Overall efficiency η — Share of nominal energy usable after converter and discharge losses.
Example
48 V · 50 Ah · 0.85 / 480 W ≈ 4.25 h.
Assumptions and limits
Constant load and average voltage; temperature, ageing and discharge curve are excluded.
Sources