Engineering calculators for faster decisions

Size a capacitor bank, a battery, a transformer or a motor cable; estimate solar and VFD savings. Every assumption is visible and editable.

Six calculators

Rooftop system size, generation, payback and 25-year returns.

Capacitor kVAR, bank size, current reduction and payback.

Backup time, battery Ah needed, bank layout and charging time.

Full-load current, starting current and cable size with voltage drop.

kVA rating, loading, full-load currents and fault level.

Energy and rupee savings from adding a drive to a pump or fan.

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