Every solar PV system includes an inverter that converts the direct current (DC) electricity generated by your solar system to the alternating current (AC) electricity used to power your facility and its equipment. Throughout this article, we’ll be discussing the concepts of line side and load side.
We''re going to discuss traditional PV inverters connected to the supply side of a main breaker/disconnect. The sum of those power sources shall not exceed the ampacity of the service conductors. If you have a PV system you''re connecting to a service, you can''t exceed the rating of those pre-existing service conductors..
In the case of a multiple inverters, a PV panel and a fused disconnect are both used, as required by code and the utility. The advantage to this approach is that it allows you to install a supply side connection that is limited only by the amperage of the existing panel.
However, if the output of the inverter is 34 amps, you would need a 42.5 amp solar breaker (34*1.25), which would exceed the 120% rule. Your solar provider will help you understand how the NEC rules apply to your situation. If your system will exceed the 120% rule, one solution is to downsize the main breaker.
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