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BatteryCalcs — calculation report

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The hard parts of electrical work explained in plain language: starting surge, reactive power, capacity, losses. No formula without an explanation.

Reactive power: why 1000 W at cos φ 0.8 loads the wiring like 1250 VA

With an inductive load, part of the current does nothing but build and release a magnetic field. It adds no active energy, yet the conductor still has to carry it. What W, var and VA actually mean — and when it genuinely matters to you. 2026-08-21

Why your inverter trips the moment the fridge starts

The battery has plenty of energy, yet the system shuts down the instant the compressor kicks in. That is not a fault — it is inrush current, and it never shows up in the watts on the nameplate. 2026-08-21