outback and error events [RE-wrenches]

[Bill Brooks]

Keith,

Christopher might know off the top of his head, but my first guess is that
the high battery voltage is simply an error being recorded in the heat of
the moment while the short circuit was being dealt with inside the inverter.
Strange transients happen in those types of situations, so if the inverter
shut down the ac very quickly, a spike could have occurred on the dc input
side that looked like a high voltage condition.

I only make this guess because I have seen this on other utility interactive
inverters. But I might be full of $#!@.

Bill.


-----Original Message-----
From: Keith Cronin [mailto:kcronin at islandenergy.net] 
Sent: Sunday, June 11, 2006 1:41 PM
To: RE-wrenches at topica.com
Subject: outback and error events [RE-wrenches]




Hello folks

 

We installed a 5.2kW PV system with 2-3048's and 8-8D's on a home, grid
tied, last year. This is fed into their main 100 amp house panel. They have
gas for all of their appliances and they are net energy exporters (hoorah!)

 

At 8:30 last night, I got the call the system was down. They couldn't
understand what was happening, but I reminded them of the bypass, so they
could isolate the situation and go to bed. (and continue the party).

 

Well, this mornings' summary with the client on the phone, left a few areas
in question. It turns out, they had a small gathering, and it seems one of
the guests, turned on a switch, that went to a future wire outside for
landscape lighting, that was not "safed" off, or a gecko ran across it and
that was the start of the situation.

 

It tripped a single, 20 amp breaker, which sent the system into a tailspin.
Inverter #1 popped up on the mate as "inverter #1 shorted", and "battery
voltage high". They system was oscillating and the lights were going on and
off every 10 seconds or so, then every 1-2 seconds.

 

Why the high battery voltage? The shorted error message makes sense..

 

Could I get some feedback on this scenario, and ways to prevent this from
happening, from a design standpoint as well as a troubleshooting guide for
clients?

 

Thanks

 

 

Keith Cronin 
President 
Island Energy Solutions Inc 
270 Kuulei Rd Suite 106 
Kailua, HI 96734 
Electrical Lic C-25221 
808-262-3268 Tel 
808-263-0338 Fax 
kcronin at islandenergy.net 
www.islandenergy.net 


  

 


[Non-text portions of this message have been removed]


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