Article 61326 of alt.solar.photovoltaic:
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From: nicksanspam@ece.villanova.edu
Newsgroups: alt.solar.photovoltaic
Subject: Re: Grid-tied only vs Battery Backup Question, when grid goes down
Date: 5 May 2008 09:36:26 -0400
Organization: Villanova University
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Ron Rosenfeld  <ronrosenfeld@nospam.org> wrote:

>... without utility backup function, an SW5548 would require only
>an 80Ah @ 48V battery.

Years ago, a Trace engineer told me they tested SWs with a bunch of
batteries that literally came from a junkyard, and the really really bad
batteries still worked fine in this mode. Maybe they only have to hold
a charge for a half AC cycle.

Nick