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

[August Goers]

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] *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 [
re-wrenches-bounces at lists.re-wrenches.org] on behalf of August Goers [
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] *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<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<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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