SolarHead
50% of people are below average. (Its a statistic)
I used a 60A breaker in my main panel , but wondering about the 120% rule on breakers. Sol-Ark mentioned I may should be using a 40A breaker instead. Anyone using a Sol-Ark 12K, what size breaker are you using in your main panel? This is the dedicated breaker for the Sol-Ark to get its AC power, as well as push back through to push power onto the main panel (if you are using "limited power to home" mode).
One reason I went with 60A breaker was because the Sol-Ark 12K can handle I think up to 63A pass-through. But then I worry about the 120% rule on breakers.
Thinking about the fact that a solar PV or battery energy storage system can supply additional power from the opposite side of the main breaker supply. There are now two separate sources feeding power from opposite ends and no single protection device that prevents the electrical equipment in the middle (bus bar in this case) from becoming overloaded. In this example, there is a total of 250 amps of power draw that would exceed the safety rating of the busbar, allow it to heat up becoming a serious fire hazard.
The NEC 120% rule limits the size of additional power sources (PV or battery) to within an acceptable safety limit based on the equipment label rating. In this case, the PV breaker would be limited to a maximum of 40 amps. 200 amp rating x 120% = 240 amps 240 amps minus the 200 amp main breaker = 40 amps max for PV breaker
Your thoughts?
One reason I went with 60A breaker was because the Sol-Ark 12K can handle I think up to 63A pass-through. But then I worry about the 120% rule on breakers.
Thinking about the fact that a solar PV or battery energy storage system can supply additional power from the opposite side of the main breaker supply. There are now two separate sources feeding power from opposite ends and no single protection device that prevents the electrical equipment in the middle (bus bar in this case) from becoming overloaded. In this example, there is a total of 250 amps of power draw that would exceed the safety rating of the busbar, allow it to heat up becoming a serious fire hazard.
The NEC 120% rule limits the size of additional power sources (PV or battery) to within an acceptable safety limit based on the equipment label rating. In this case, the PV breaker would be limited to a maximum of 40 amps. 200 amp rating x 120% = 240 amps 240 amps minus the 200 amp main breaker = 40 amps max for PV breaker
Your thoughts?