1000 volt single phase inverters

[PVfarmer]

a residential ground mount with inverter at the array should be permitted to run at 1000V.

The issue of the 600V rating on the Fronius Primo data sheet may still be a problem that needs to be solved, though.

To me the "on or in other buildings" part sounds like 1000VDC panels on a garage roof to a 240V inverter inside the garage are ok.

I read 2017 as-
If the 240VAC inverter is attached to a house with 1000VDC wires attached to it, that is not allowed.
If the inverter is not attached to the house, then 240VAC is the voltage that is "on or in" the house.

Max. input voltage
600 / 1000V**
**The maximum voltage for installations in or on residential dwellings must not exceed 600 Vdc.

http://hespv.ca/hesproductspecs/Fronius/Fronius_Primo_compressed.pdf

 

[SolarAlternativesDesign]

Fronius tech support provided this official looking letter verifying that the 1000V limit shown in the operating manual is the limit for which the Primo inverters were designed, built and tested and that they are "certified" by Fronius for 1000V use. It also explains why the data sheet shows 600V.

 

[SolarAlternativesDesign]

To me the "on or in other buildings" part sounds like 1000VDC panels on a garage roof to a 240V inverter inside the garage are ok.

I read 2017 as-
If the 240VAC inverter is attached to a house with 1000VDC wires attached to it, that is not allowed.
If the inverter is not attached to the house, then 240VAC is the voltage that is "on or in" the house.

Max. input voltage
600 / 1000V**
**The maximum voltage for installations in or on residential dwellings must not exceed 600 Vdc.

http://hespv.ca/hesproductspecs/Fronius/Fronius_Primo_compressed.pdf

That's how I read it also. Where 2017 690.7 says "PV system dc circuits on or in one- and two- family dwellings" it should be clear that the conductors on the AC side of the inverter aren't considered in the 600V limit.

 

[electrofelon]

Fronius tech support provided this official looking letter verifying that the 1000V limit shown in the operating manual is the limit for which the Primo inverters were designed, built and tested and that they are "certified" by Fronius for 1000V use. It also explains why the data sheet shows 600V.

Cool thanks. I hadn't crossed paths with that document. Maybe it is my overly logical brain, but I find the last and second to last paragraph to be a waste of ink.

 

[jaggedben]

Cool thanks. I hadn't crossed paths with that document. Maybe it is my overly logical brain, but I find the last and second to last paragraph to be a waste of ink.

LOL, that's what I thought, too.

 

[pv_n00b]

Even when DC at <1000V is specifically permitted?
The 3rd sentence, "on or in other types of buildings"...does that mean *all* other types?
2017:

View attachment 17053

Currently all building mounted PV system DC circuits are limited to 1kV, or less for residential. There are some exceptions for large PV systems that have buildings whose only purpose is for the PV system to have higher voltage DC conductors inside. This is mainly for those multi-MW inverter sheds you see at utility scale projects. Enclosed sheds are considered buildings and it would not make much sense if you could not run 1.5kV DC circuits to the inverters inside.