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

[Marco Mangelsdorf]

With SMA's assistance, we're replacing the two 10 kW TLs with non-TL SB US
inverters.

 

marco

 

  _____  

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] 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] 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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