HI Larry, I'll chime in here with the "other" option, ie no batteries at all.
Instead its a back up generator. I've found them to be much cheaper, and if you are expecting a longer outage then weather is usually a problem ie its overcast and therefor you'll need a backup for your battery system anyway, so just go with the backup. jay peltz power On Sep 2, 2011, at 8:51 AM, Larry Brown wrote: > Wrenches, > > After Hurricane Irene left a lot of people without power here in the > Northeast, customers who have grid-tied systems are asking about some battery > backup to power some essential loads. > > We have used Sunny Islands but they require either 2 Sunny Islands or a step > up transformer to get 240 volts for the well pump. Schneider Electric > (Xantrex XW) inverters look like they would work for this application and do > 120/240 volt output as well and we have used these in off grid applications > but not as AC coupled. I have considered Magnum because they also do 120/240 > volts but they need battery diversion to ensure the batteries are not over > charged. > > None of these systems are going to be rewired as a DC system so I am looking > for any feed back on what others are using to AC couple to existing grid-tied > systems to provide some battery backup. > > Thanks > Larry > > Larry Brown > Sun Mountain_______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
