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Tesla says I don't need a new panel for our solar glass roof. Besides it being old and original, it is completely used up. I will probably replace it before the roof is installed, but I found it strange they didn't recommend an upgrade. Am I missing something?
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I have no clue about a backfeed breaker. I assume you feel I need a bigger panel.Where is the backfeed breaker going to go if there's no more room?
The current plan we've been presented is 6.5kW, though I'm hoping to squeeze another .5kW out of our roof. We have 100 amp service.What's your solar roof output rated at, and what's your main feed rating?
Tesla says I don't need a new panel for our solar glass roof. Besides it being old and original, it is completely used up. I will probably replace it before the roof is installed, but I found it strange they didn't recommend an upgrade. Am I missing something?
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Your Cutler-Hammer electrical panel has 22 slots. Tandem circuit breakers may be used to make room. The existing Slots 12, 15, and 17 are tandem breakers (and I assume your panel has capacity to convert some of the existing circuit breakers). The 120 volt circuits in Slots 14, 16, 18,19, 20, 21, and 22 may combined to make room. Even the 240 volt circuits in the top half of the panel can be combined. See below picture of my home loads panel during installation with tandem circuit breakers on most of the circuits. Note, solar and powerwalls are installed at the bottom.
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A back feed circuit breaker is the circuit breaker(s) solar and/or Powerwalls are connected to in the panel. They back feed solar and battery power into the panel. A breaker does not care which direction current flows. It works the same if your using it normal or back feeding it. As in the above photo, Per code, Tesla prefers to install the back feed circuit breaker at the exact opposite of the main load on top.
Thank you for the explanation, GenSao! So my panel isn't really "used up". It's just old and ugly. But, hey, if I can save 2 or 3K by not upgrading, I'll take it.
Aren't main busses limited on how much you can backfeed? In my case I have a 200 amp panel and could only backfeed 20%, or 40 amps. I originally ordered a large system (60 amp backfeed breaker) and had to change to medium (40 amp backfeed) to avoid a panel replacement. Can't remember if that was a local regulation or NEC.
P=IV (power = current x voltage)I appreciate all the information that’s been shared thus far.
So will a 20 amp backfeed breaker handle a 7.3 kW system that we've recently signed off on?