Residential Solar Photovoltaic (PV) System

For example: if the panel being tied into is rated for 100 amps and is protected by a 100 amp main breaker, in order for a 30 amp PV tie-in-breaker to backfeed the panel, the main breaker protecting the panel must be reduced down to 70 amps (30+70=100), and assuming that the building’s existing electrical loads on that panel (calculated as ... ................
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