RE_Wrenches - FW: power panels [RE-wrenches]

Jeffery Wolfe, Global Resource Options jeff at globalresourceoptions.com
Tue Mar 16 07:43:07 PST 2004


Robin Gudgel of Outback requested that I post the following to the list,
as it pertains to the pre-built power panel issues.

Jeff





------------------------------------------------------------------------
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From: Robin Gudgel [mailto:maryrobin at msn.com] 
Sent: Monday, March 15, 2004 11:39 AM
To: info at GlobalResourceOptions.com
Subject: power panels


Jeff,
I am not allowed to post on the wrenches and Christopher is on the road
so I thought you might be able to post this for me.

When we designed the DC250 years ago, we didn't for see all the
implications of the system design. The C-40 didn't even exist yet. We
put the C-40 breaker on the battery side of the battery breaker for the
reasons listed. Jay is correct that there should be a battery breaker
and a PV breaker for the charge controller. We just didn't think it
through very well back then. The listing that comes with the power panel
is a UL508A listing. That means they can do what ever they want! They
are certifying that it all meets code. Nobody has ever actually
inspected or listed the power panel as an assembly at the factory (or
ever will). You have to rely on the company applying the UL508A label to
have done their homework? Perhaps you should check with who insures that
the pre-wired assemblies coming from "factories" are actually code
compliant. You may be surprised. 
Another thing we have learned over the years is that you never use
separate AC bypass breakers for stacked inverters. This can lead to
overloading the neutral conductor on some homes. This can be dangerous. 
Robin Gudgel

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