diy solar

diy solar

Home Builder Looking to Offer Solar for our Customers

The size grid-tie system people can install is often limited by rules on how many amps of circuit breakers can feed a breaker panel.

NEC allows main breaker plus PV breaker to be 120% of busbar rating. Of course the busbar isn't allowed to carry more than 100% of its rating, but PV breaker is put at far end, away from main breaker. A 100A panel with 100A main breaker can have 20A PV breaker installed at far end. A 20A breaker can carry 16A continuous load. 240V x 16A = 3840W maximum PV inverter output. If 200A busbar and main breaker, 40A PV breaker, 32A PV, 7680W maximum PV.

Beyond that, need a larger panel, smaller busbar, or multiple panels.

Planning to have the right breaker panel (and maybe a sub panel for battery backup protected loads) would be part of your design.
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