i just got an email from my electric company saying that my sw 4048 inverters aren't approved for gridtie that they aren't UL listed for grid tie according to the xantrex website
I've searched all over the xantrexwebsite and can't find a thing on them saying they aren't listed
everything i've read says they are


any suggestions

Well for starters, you can just look at your inverter, if its listed, it will have a UL1741 sticker on it, but part of that listing requires you have the GTI modules installed. If you don't have those then your Electric company is correct that your SW4048's are not UL listed for gridtie operation.

If your unit is labeled as compliant and you have do have the GTI's, then have your utility check this list, its what California allows for there gridtie rebate program and show them the UL1741 sticker showing its is compliant.

http://www.gosolarcalifornia.org/equipment/inverter.php

thanks sg the sw is UL1741 listed with the revised 4.10 software which means it doesnt require an extra gti as it is built in

my inverters have the revised software

another question...the utility company is also saying i'm required to have a one line diagram on file at their office....is this the case everywhere...sounds unusual

The only sw4048's that meet UL REQUIRE the GTI ... I'm 100% sure of this. No SW4048 installations without GTI's are UL1741 listed, I was with Xantrex when all this went down and I know first hand what happened. Based on your firmware ( 4.10 ), I would say you have a pre 2001 unit, that's NOT certified for gridtie, you need updated firmware ( 4.20 ) and the GTI units for you installation

Hear is the manuals on the required GTI

http://www.xantrex.com/web/id/115/p/doc ... roduct.asp

And quoted from the manual, page 7 http://www.xantrex.com/web/id/605/docserve.aspx

I had to supply a 1 page wiring diagram, but I don't recall if that went to the Building Inspection office, or Edison. Either way, I had to supply the signed permit, to get Edison to sign off on it.

thanks again...yes i see now with all the calls i made today the gti is required ,but now i'm finding out it is no longer availiable anywhere...

guess i will try to sell these inverters and get an xw4548