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 Post subject: Xantrex: Positive or negative ground?
PostPosted: Wed Oct 18, 2006 12:43 am GMT EthGMT 
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Minnow
Minnow

Joined: Sat Nov 26, 2005 6:47 pm GMT EthGMT
Posts: 17
I'm specing a DIY system for my home and am going to use a Xantrex GT3.3 (240) with 16 Evergreen 190's in a single string. The Xantrex 3.3's come in both postiive and negative ground. Is there a standard or an advantage to having either positive or negative ground?

The 3 line drawing that SRP (AZ utility) sent me to check out has a Sunpower with a positive ground. Their rules didn't specifiy either.

Can you help?

Thanks!

Mikey


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 Post subject:
PostPosted: Wed Oct 18, 2006 10:18 am GMT EthGMT 
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Red Cobra Delta Guppy
Red Cobra Delta Guppy
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Joined: Sun Jun 02, 2002 1:01 am GMT EndGMT
Posts: 1158
Location: Lakeland Florida
Only the Sunpower panels require positive grounded inverter, something due to the panel technology and charge build up on the glass to cell area when positive charged

All other systems are negative ground and that what I would build.

Also note, there are no battery backup systems that are positive ground as all charge controllers are of the non-isolated design. The Inverters, which by code, provide galvanic isolation and hence are isolated from the inputs, which allows for either potentional.


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 Post subject:
PostPosted: Thu Oct 19, 2006 10:07 am GMT EthGMT 
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Minnow
Minnow

Joined: Sat Nov 26, 2005 6:47 pm GMT EthGMT
Posts: 17
Thanks Guppy!

Negative it is!


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