How Does A Solar Panel Backfeed Another Solar Panel

My question has to do with the nec s requirement of the sum of the amps ratings of the overcurrent devices shall not exceed 120 percent of the rating of the busbar or conductor.

How does a solar panel backfeed another solar panel. Here s a question for some of you green energy folks who re familiar with solar power how when does the system backfeed the grid. Having all the current entering the bus bar at the same place tends to let heat build up he explained. The first guideline has to do with wire sizing. Nowadays as the price of solar panels drops the size of the solar array rises.

John smith is a homeowner in california looking to reduce his electric bill by going solar and he decided to call an installation company that he found on the internet. Once solar inverters get larger than. How a solar pv system works. I ve seen some hints that without batteries or grid power a solar panel can t fully start and run an inverter but i can t find any information to back that up and it feels like backfeeding would.

This inverter converts the dc electricity produced by your solar array into ac electricity which is suitable for household consumption. The sizing of back feed breakers is another point of difficulty. Here are the guidelines i wanted to share. We are going to put a 100a subpanel in the garage.

In most cases you should locate the backfeed breaker at the end of the panel opposite from the main breaker to balance the heat distribution on the bus bar. A larger solar array requires a larger inverter. When sizing your dc run you must use short circuit panel amps times 1 25 as shown in figure 11. Solar pv systems work by producing electricity via a solar array.

Back then a typical solar system was about 500w. The sunlight that hits your panels is converted into dc electricity which is fed into an inverter. The next day a rep from xyz solar came out to his house and after looking at his electric bill told john that he would need an 8 5kw pv system to offset 100 of his past 12 month usage.