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Adding additional solar panels

miimura

Well-Known Member
Aug 21, 2013
7,211
7,168
Los Altos, CA
I wonder if it would make more sense to replace the 10 year old Sunpower 4000w inverter with a larger one.
I would think replacing the 210W panels with 300+W panels and a new inverter would be easy if you could re-use the same racking.

I am seriously considering replacing my 9 year old and degraded 240W polysilicon panels with new ones, re-using the old Enphase Micro-inverters. The primary consideration is keeping the same panel frame size and 60 cell panel type so they drop in with no other changes.
 

nwdiver

Well-Known Member
Feb 17, 2013
8,856
12,943
United States
I wonder if it would make more sense to replace the 10 year old Sunpower 4000w inverter with a larger one.

Good chance. For the cost of 6 micro inverters and the trunk cable and all the other ancillary stuff you'd need you're almost at the cost of a 7.6kW SMA inverter that can handle ~11kW of solar. How does your solar play with your Powerwalls off-grid? New Rule 21 inverters are able to adjust their output so they're not just on or off.
 

nwdiver

Well-Known Member
Feb 17, 2013
8,856
12,943
United States
Maybe I’m wrong on this but 6 327w panels is almost 2000w which would leave me only 1000w on that inverter and 6 more of those panels would be another 2000w. I’m I thinking correctly.

That would be fine. I have 10.7kW on a 8kW SMA inverter. Do you have SMA? For some reason that's my recollection. Might have a 'SunPower' brand label on it.
 

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