[RE-wrenches] 120/240 Delta

[David Quattro]

Are you sure they are out of phase?  or is it Zero volts from L to L?



On Wed, Mar 25, 2026 at 9:09 AM David Quattro <david at quattrosolar.com>
wrote:

> Even if some amalgamation of hardware could play along, personally I
> wouldn’t do it.  It’s out of the ballpark with all major brands. Your
> highest voltage will be 120v, thus your amps would be high. Sounds like a
> warranty nightmare. I think that restaurant needs to upgrade their electric
>
>
>
> On Wed, Mar 25, 2026 at 8:54 AM Michael Morningstar via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> Wrenches,
>> I have a customer that has asked me to provide their restaurant with PV
>> and battery back up. Easy-peasy or so I thought. It turns out that the
>> service that supplies the restaurant is being fed by two phases from a
>> 120/240V transformer. The service entrance conductors are direct burial and
>> run under a large paved parking lot, so there's no changing that
>> arrangement. I'm at a loss as what I can do here. I don't believe that
>> something like a Sol-Ark 18k is going to play nice with two legs 120
>> degrees out of phase? The 30K definitely needs all three phases so a 240
>> Delta/208 WYE isn't going to help? I don't even think there are
>> micro-inverters or string inverters available to give them just straight
>> grid-tied and no BB. Are there any solutions that I'm unaware of?
>> Michael
>> ?
>> --
>>
>> Michael Morningstar
>>
>>
>> Morningstar Electric Inc
>>
>> PO Box 1494
>>
>> Mount Shasta, CA 96067
>>
>> 530-921-0560
>>
>> CSLB 1116835
>>
>> mjmorningstar at gmail.com
>>
>>
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