[RE-wrenches] Unusual problem with SMA TL inverter on metal roof

[Steve Jefferson]

August,

Please contact me offline about this.

According to the notes when you called in, you had a true ground fault. With DC voltage present to ground.

Thanks

SMA America, LLC
Steve Jefferson
Service Line Supervisor
3925 Atherton Ave
Rocklin, CA 95765 - 3714
U.S.A.
Tel:  +1 916 625 3185 (direct)
Fax: +1 916 625 0871
Mobile: +1 916 622 4253
Email: Steve.jefferson at SMA-America.com<mailto:Steve.jefferson at SMA-America.com>
www.SMA-America.com<http://www.sma-america.com/>

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From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of August Goers
Sent: Wednesday, March 26, 2014 7:13 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Unusual problem with SMA TL inverter on metal roof

I should have mentioned that our installation is not a metal roof either. Ours is a flat foam roof with large tilt racked arrays of SunPower modules.

I've spoken with SMA tech support twice on this and got the idea that either I have a real ground fault or that there is some sort of inductance related problem that they don't necessary have a fix for yet.

Best, August

From: re-wrenches-bounces at lists.re-wrenches.org<mailto:re-wrenches-bounces at lists.re-wrenches.org> [mailto:re-wrenches-bounces at lists.re-wrenches.org<mailto:re-wrenches-bounces at lists.re-wrenches.org>] On Behalf Of Jeff Irish
Sent: Tuesday, March 25, 2014 6:34 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Unusual problem with SMA TL inverter on metal roof

August,

We're seeing multiple inverters with the same error, and not getting the best of answers or support from SMA on fixing the problem so far.  And this is not a metal roof; it's PanelClaw on EPDM.

Jeff Irish
Hudson Solar
________________________________
From: re-wrenches-bounces at lists.re-wrenches.org<mailto:re-wrenches-bounces at lists.re-wrenches.org> [re-wrenches-bounces at lists.re-wrenches.org<mailto:re-wrenches-bounces at lists.re-wrenches.org>] on behalf of August Goers [august at luminalt.com<mailto:august at luminalt.com>]
Sent: Tuesday, March 25, 2014 8:41 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Unusual problem with SMA TL inverter on metal roof
Hi Marco,

Did you ever make any progress on this issue? We're having an interesting issue with one of the new Sunny Tri-Power inverters (a 24 kW unit in this case) where we get an error "residual current too high." We've only done a little troubleshooting so far but I don't think we have a ground fault.

Best,

August

Luminalt

From: re-wrenches-bounces at lists.re-wrenches.org<mailto:re-wrenches-bounces at lists.re-wrenches.org> [mailto:re-wrenches-bounces at lists.re-wrenches.org<mailto:re-wrenches-bounces at lists.re-wrenches.org>] On Behalf Of Marco Mangelsdorf
Sent: Friday, March 14, 2014 9:56 AM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] Unusual problem with SMA TL inverter on metal roof

Probably not.

From: re-wrenches-bounces at lists.re-wrenches.org<mailto:re-wrenches-bounces at lists.re-wrenches.org> [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of RE Ellison
Sent: Friday, March 14, 2014 1:24 AM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] Unusual problem with SMA TL inverter on metal roof

Is the metal roof grounded? Just a fast thought.

bob

From: re-wrenches-bounces at lists.re-wrenches.org<mailto:re-wrenches-bounces at lists.re-wrenches.org> [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Marco Mangelsdorf
Sent: Thursday, March 13, 2014 10:31 PM
To: 'RE-wrenches'
Subject: [RE-wrenches] Unusual problem with SMA TL inverter on metal roof

Friends,

We have run across an odd technical problem at our commercial install at a laundromat on our island.   Attached is the description of the issue from SMA.  We don't know much except that we are switch out the TL inverters to the old style US inverters because SMA has no fix for the phantom ground tripping.  The issue is beyond our feeble understanding.

Any observations to share?

Thanks,

marco

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