I believe that when you have a TL inverter that has two channels you may have 
up to two strings, unfused, going into each channel.  Thus leaving you with 
four strings of modules with no fusing.  

 

Mike Kocsmiersky

Principal

Phone: 413 883-3144 

Spirit Solar

www.SpiritSolar.net

 

 

From: Jerry Shafer [mailto:jerrysgarag...@gmail.com] 
Sent: Friday, January 29, 2016 6:07 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] DC Fuses on TL Inverters

 

Wrenches
We have been installing combiners with anything more then 1 string on the TL 
inverters. Troubleshooting is better with a remote combiner, its seems a waist 
but all our inspectors to like to see it also. 

On Jan 29, 2016 10:36 AM, "Mark Byington" <ma...@cobaltpower.com> wrote:

 

"Transformerless inverters need fuses on both DC positive and DC negative legs 
to protect the inverter in case of ground fault."

 

I could be wrong, but my understanding is that TL inverters are no different 
than transformer type inverters in terms of DC fusing requirements - no fuse 
required for one or two strings in parallel; fuses required on + and - leads 
for 3 or more strings in parallel.

 

Mark Byington

Cobalt Power Systems, Inc.

 

 


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