Power backup

Backup sizing starts with the load to be carried and how long it must run. Generators, inverters, solar panels and battery banks play different roles: continuous standby, short bridging or generation. Specify the load in kVA or kW, single or three phase, hours of autonomy, fuel type, battery chemistry, available space and ventilation, and any noise limit. Installation, changeover wiring and earthing (IS 3043; check the current edition) are for licensed electricians.