anecdote: the economics of overpaneling a charge controller

The upgraded panels have been mounted for about a month and this morning is the first time the controller got close to clipping power at rated current (40A). Refresher: the EpEver 4215BN solar charge controller specs say it is rated for 40A output, which the docs also express at 520w on nominal 12v systems. The

redux: why overpaneled systems don’t make braggable power

I’ve talked about this before but will revisit because it is so danged counterintuitive: overpaneled solar configurations rarely make impressive levels of power. For example, this morning the system achieved Vabs (14.7v) at 0950 local time.   By definition, charging acceptance will drop from this point until float (or sundown in my case).  So barring the

circuit breakers

Thinking out loud a bit here. When I mounted the electrical panel mock-up on the wall I ordered some components for it off Amazon: 12v fuse block.  Only ordered one but will eventually need two, one for normal house loads and one for opportunity loads. 15A self-resetting circuit breakers 40A self-resetting circuit breaker cable clips