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What should my Solarglass roof produce...?

Keoni8888

Member
Jul 30, 2020
13
9
Simi Valley, CA
Is there a reason why 2 powerwalls would not back up your AC?

Yes and no... They are older 10 seer models (from 2003) and the LRA is 81A. I actually measured them at about 90A inrush. So the startup current is much too high for the Powerwalls. Tesla told me that soft starter devices would not be enough to bring down the LRA, so denied hooking them up originally. But after some research I found (and installed) some devices that bring the LRA down to about 19A each - well within specs for the 2 Powerwalls. In any case, I have ordered another PW and will have then move the ACs over to the backup load on install (3 PW can backup 56-83 LRA, 2 PW need to stay below 55). I am also going to replace the ACs with much more efficient ones in the winter (budget constraints due to a very expensive roof :)).
 
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nwdiver

Well-Known Member
Feb 17, 2013
8,115
10,584
United States
I am also going to replace the ACs with much more efficient ones in the winter.

I have a 21 SEER 2 ton multi-split that's magical. I can easily run it off-grid with a 4kW inverter. Cooling 1 room it pulls ~800w. Lots of VFD options out there now. Any VFD is going to have 0 starting current.
 

Keoni8888

Member
Jul 30, 2020
13
9
Simi Valley, CA
I have a 21 SEER 2 ton multi-split that's magical. I can easily run it off-grid with a 4kW inverter. Cooling 1 room it pulls ~800w. Lots of VFD options out there now. Any VFD is going to have 0 starting current.

Thanks @nwdiver ! I'd love if you could fill me on on this as I am not familiar with VFD (other than what I just Googled). What should I be looking for in a good AC (central, not split) that is compatible with VFD? I'm looking for two 3 ton 21 seer systems with zoning. Does anything good, like Lenox, work in with these devices? Please PM me if you would not mind so as not to take the thread in a different direction.
 

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