UL 1741 specification and minimum voltage

[tweekzilla]

I live in an SCE area and have a sunyboy 5000TL-US invertor. When the temperature gets hot in my area the voltage to the house drops down to about 105V or less on each phase. This causes the invertor to issue a grid fault and not produce electricity. I've complained to SCE on many occasions and they have done nothing about it. Is 105V outside of the UL1741 standard? Any ideas on how to convince SCE that they are producing poor power?

[bcroe]

There are 3 ways to fix it. Get your PoCo to keep the voltage in range; reprogram the inverter lower trip
out line voltage below 105/210; or use a dual auto transformer to boost the line voltage by something like
5VAC more on each leg to your inverter. Such a transformer would be needed to rated at least 24A and
250W or VA to give you a 5 + 5 boost. good luck, Bruce Roe

[tweekzilla]

Thanks bcroe. BTW do you know what the minimum voltage is from the standard? I'd like to be able to tell SCE that they are providing power that is not to the standard

[sensij]

SCE's Rule 2 in their tariff book specifies 228 V (114 V each phase) for residential service, and allows another 4 V drop per phase for house wiring to suggest that lighting equipment designed for 110 V min (or other equipment at 108 V min) should be OK. (All based on ANSI C84.1, which is the relevant standard for service, not UL)

https://www.sce.com/wps/portal/home/...vZ0FBIS9nQSEh/