Grounded negative for Evergreen panels

Discussion about the Power System DC Disconnect (PSDC)

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mcandy
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My RE system: 8 Evergreen ES190, 2 Rolls 12PS11CS (12v @ 1000Ah), MX60, VFX2612e, Mate, Bio-diesel micro-CHP.
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Grounded negative for Evergreen panels

Post by mcandy » Mon Oct 22, 2007 2:33 pm

We have just been notified that our installation of Evergreen ES190 panels must have the PV negative tied to ground otherwise the power output will gradually fall.
My reading tells me that the MX60 will be fine with this but the GFP2 will not.
Any ideas for maintaining ground fault protection with the negative grounded?

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crewzer
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Post by crewzer » Mon Oct 22, 2007 5:02 pm

Arrays should be grounded for safety reasons. The power output of all PV modules will fall with age. However, it's something that happens gradually over years and decades.

Here's a link to Evergreen's installation manual. There's no mention of grounding for the purpose of improving power output. See: http://www.evergreensolar.com/upload/In ... 010707.pdf

Who/what was the source of your notification?

HTH,
Jim / crewzer
090805 System Configuration: 966 W STC (849 W CEC PTC) 48V PV array, FM80, 24V x 400 Ah AGM battery bank, FX2524T w/ BTS, Hub-4 & Mate; Link-10 w/ BTS, & E-Panel.

Kent Osterberg
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Post by Kent Osterberg » Wed Oct 24, 2007 9:28 pm

It's the GFP/2s job to make the connection between the DC negative and ground. If you have the GFP/2 installed correctly you are covered. Don't add a second connection between DC and ground anywhere.

mcandy
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Posts: 6
Joined: Thu Oct 11, 2007 11:53 am
My RE system: 8 Evergreen ES190, 2 Rolls 12PS11CS (12v @ 1000Ah), MX60, VFX2612e, Mate, Bio-diesel micro-CHP.
Location: In a wee Scottish glen
Contact:

Post by mcandy » Thu Oct 25, 2007 8:42 am

The notification came from Evergreen via their European distributor, Donauer solar, who forwarded it to all who had bought Evergreen ES panels.

I wondered about the GFP2 grounding the negative as the sample diagram in the MX60 manual without a GFP2 shows the negative grounded directly.

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