"Solar Generator" compliance requirements

[retirede]

Back-up generators connecting to building wiring fall under NEC Art. 702 for optional standby systems. Parts of UL 1741are applicable to stand alone systems. I'm not sure what the applicability is to portable systems.

How can only part of a UL standard be applicable? I’d think a device would either be listed to the standard, or not.

And one of the tests performed under 1741 is to ensure the inverter shuts down on loss of grid. It can’t apply to a standby system.

 

[jaggedben]

How can only part of a UL standard be applicable? I’d think a device would either be listed to the standard, or not.

And one of the tests performed under 1741 is to ensure the inverter shuts down on loss of grid. It can’t apply to a standby system.

UL 1741 covers all sorts of stuff, just like the code. It's 214 pages. If a piece of equipment is not intended to perform a particular function that happens to be in the standard, that's no more surprising than, say, an electrical installation that doesn't happen to have features covered by a part of the code, such as a transformer or a solar system.

I haven't read the standard, but I understand the anti-islanding portion of UL1741 applies to both interactive inverters and interconnection devices (e.g. Telsa Gateway) that don't do inversion. It also covers things like solar charge controllers that don't do either. I'm sure it covers stand alone inverters that don't interconnect.