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Old 04-17-2019, 12:02 AM   #1
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Exclamation Backfeed breaker for solar system

I'm swapping out a 100 amp panel that was damaged for another 100 amp panel. Adding spaces w/ my new panel. The previous panel had the solar hot tapped in btwn. The 100 amp & the service head, instead of being put on a breaker.

Now that i have extra spaces for a breaker, do you think i should hot tap the solar to my new panel instead of putting on a breaker that would increase heat on my bus bar?
(being this main panel is the customer's only panel-he doesn't have subpanel in house.
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Old 04-17-2019, 06:18 AM   #2
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Just put a fan in there.
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Old 04-17-2019, 07:46 AM   #3
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Separately derived systems require disconnect means. Breaker at panel minimum. BTW, How do you avoid backfeed of utility into solar system? How do you avoid solar backfeed into the utility grid during power outage (when linemen working on system)?
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Old 04-17-2019, 07:57 AM   #4
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Quote:
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Separately derived systems require disconnect means. Breaker at panel minimum. BTW, How do you avoid backfeed of utility into solar system? How do you avoid solar backfeed into the utility grid during power outage (when linemen working on system)?
Hello, welcome to the forum.

A breaker in the panel is not required.
You want the solar system to backfeed into the grid, that is the entire point of a grid-tied system.
During a power outage, the "anti-islanding" function will shut down the system to prevent backfeeding.
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Old 04-17-2019, 03:33 PM   #5
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20 years of hacked together PV systems ....
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Old 04-17-2019, 05:48 PM   #6
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You will need a continuum transfuctioner in order to make this work properly
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Old 04-17-2019, 08:20 PM   #7
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I hate back feeders...
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Old 04-17-2019, 10:45 PM   #8
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I'd simply solder speaker wire to the buss bars and attach that to your photovoltaic array. Maybe also wire in a pull-chain switch just to be safe.
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Old 04-17-2019, 10:54 PM   #9
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Solar System ??
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Old 04-18-2019, 10:33 AM   #10
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Where the hell is Pluto?
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Old 04-18-2019, 11:52 AM   #11
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Where the hell is Pluto?
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Old 04-18-2019, 11:52 AM   #12
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Quote:
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Where the hell is Pluto?
Pluto is no longer a planet. It got demoted
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Old 04-18-2019, 03:38 PM   #13
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Quote:
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Pluto is no longer a planet. It got demoted

Had to be, it's smaller than our moon.
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Old 04-18-2019, 06:48 PM   #14
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Quote:
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Quote:
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Where the hell is Pluto?
Pluto is no longer a planet. It got demoted [IMG class=inlineimg]https://www.electriciantalk.com/images/smilies/biggrin.png[/IMG]
I refuse to accept this. Grandfather clause. That is all.
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Old 04-18-2019, 06:55 PM   #15
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Fun Fact: You can line up all the other planets- Mercury, Venus, Mars, Neptune, Saturn, Uranus, and Jupiter in the space between the Earth and our moon.
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Old 04-19-2019, 09:37 PM   #16
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Quote:
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Fun Fact: You can line up all the other planets- Mercury, Venus, Mars, Neptune, Saturn, Uranus, and Jupiter in the space between the Earth and our moon.

Fasinating
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Old 04-21-2019, 06:55 AM   #17
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Quote:
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Separately derived systems require disconnect means. Breaker at panel minimum. BTW, How do you avoid backfeed of utility into solar system? How do you avoid solar backfeed into the utility grid during power outage (when linemen working on system)?
what? you must be joking.
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