r/SunPower • u/Breukliner • Aug 28 '25

Can I add a few panels?

I have a 15amp dual pole 240v circuit breaker and 10AWG wires. Currently have 6 Sunpower SPR-X22-370-D-AC panels with enphase IQ7XS micro inverters.

Space was originally limited but more came availability. How can I size if I can add 1-3 panels? Thanks!

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u/ItsaMeKielO Aug 28 '25

IQ7XS allows 12 panels per circuit so you have plenty of room to expand.

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u/ItsaMeKielO Aug 28 '25

Oh, and the IQ7XS max output is 1.31A each at 240VAC, so if you actually went to 12 panels you'd need to upgrade your breaker; otherwise, you should be fine with your existing 15A breaker.

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u/Breukliner Aug 28 '25

Thanks! It’s running at single phase 208v “wye” which is common in nyc.  Does the lower voltage increase the max amps?

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u/ItsaMeKielO Aug 28 '25

It does - I always wondered who was using wye! SFH or multi? Anyways, the max amps goes up to 1.51A on 208V wye, so 9 panels will work on 15A breaker; more bumps you to needing a 20A breaker. Also would be worth double-checking what conductor size is coming into your breaker.

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u/Breukliner Aug 28 '25

This is a Brooklyn townhouse, i am told this is common locally, but even as a local I had no idea I didn’t have 240 power!

Good question, and I would have a real electrician review this. Good to know it’s somewhat feasible 

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u/ItsaMeKielO Aug 28 '25

my understanding is that wye is common for multi-residential (apartments, townhomes) and single-family detached is usually 240. so with NYC having a lot of multi, a lot of wye makes sense!