[RE-wrenches] Inverter back feed liability

[wes kennedy]

Hi All,
My 2 cents.
UL1741 and IEEE 1547 talk about Anti Islanding requirements for grid interactive inverters. It is possible in theory, if the load on the grid exactly matched the pv production you could have an islanded situation. But as soon as the teeter totter tipped either way, the island collapses. 
I agree with Chris, if it were to happen, then the inverter manufacturer would be at fault.  -Wes Kennedy 303-653-3073
      From: Chris Mason <cometenergysystems at gmail.com>
 To: RE-wrenches <re-wrenches at lists.re-wrenches.org> 
 Sent: Sunday, November 22, 2015 3:34 PM
 Subject: Re: [RE-wrenches] Inverter back feed liability
   
As long as the inverter carries a UL listing, it is the manufacturer's liability.


On Sun, Nov 22, 2015 at 6:10 PM, <toddcory at finestplanet.com> wrote:

worst case scenario, a battery based inverter system trying to power the grid would immediately shutdown on overload as the "infinite load" of the grid would look like a dead short. also, all utility workers treat lines as "live" and routinely short out feeders before working on them... so the likelihood of this being an issue is extremely tiny. someone else would have to address the liability issue, but i imagine this is covered in the utility's net metering contract. todd   

On Sunday, November 22, 2015 1:19pm, "gary easton" <gary at arp-solar.com> said:

Hello Wrenches,I have an electrical engineer customer that asked me a "what if" that I had not heard before. If an inverter somehow back feeds the grid during an outage and damages something or hurts someone who is liable? 
-- 
Gary Easton
Appalachian Renewable PowerStewart, Ohio 45778
NABCEP Certified Solar PV                                                            
T: 740-277-8498 www.arp-solar.com
“First they ignore you. Then they laugh at you. Then they fight you. Then you win.”
~Ghandi


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-- 
Chris MasonNABCEP Certified Solar PV Installer™Solar Design EngineerGenerac Generators Industrial technician
www.cometsolar.com264.235.5670869.662.5670Skype: netconcepts
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