Could you use the old Dankoff trick of running through 2 poles in series of a 300 v rated switch? That used to be approved, before we had all these 600 v rated equipment.
R. Walters [email protected] Solar Engineer On Nov 7, 2011, at 1:16 PM, Larry Crutcher, Starlight Solar Power Systems wrote: > Ray, > Yes, the idea was for a low cost way to add battery backup to existing high > voltage PV grid tie systems, not new construction. > > The second inverter does not need to be able to sell since that is handled by > the grid tie inverter. It simple passes grid power to loads and maintains the > battery. That means any off-grid inverter/charger or even low cost separate > inverters and chargers may be used, a very economical solution. However, the > idea may be of no value because it appears no one makes a transfer switch. > > Larry Crutcher > Starlight Solar Power Systems > > > > > On Nov 7, 2011, at 11:32 AM, Ray Walters wrote: > >> Just curious, what's the advantage of switching at the array vs. just using >> a Sunny Island or Outback system? Seems this would cost more, and have less >> efficiency, since you would still have the battery float losses, backup >> inverter idle losses, in addition to the 2nd grid tie inverter losses. Are >> there site specific conditions driving this that I'm not understanding? >> I've done quite a few GT systems w/ battery backup, so I'm always up for new >> ideas though. >> >> Ray >> >> >> On 11/7/2011 12:15 PM, Larry Crutcher, Starlight Solar Power Systems wrote: >>> >>> Hi Glen, >>> That model is a disconnect switch. What the system needs is a 4 pole >>> transfer switch, automatic or manual, to connect the PV source to the >>> charge controller. >>> >>> Hello Gary Willit, >>> Yes, you've grasped my concept precisely and I agree, getting a high >>> voltage DC transfer switch may nix this design. Sounds like a product for >>> Midnite Solar to build. >>> >>> >>> >>> Larry Crutcher >>> Starlight Solar Power Systems >>> >>> >>> On Nov 6, 2011, at 1:42 PM, Glenn Burt wrote: >>> >>>> Siemens makes a line that are UL listed. >>>> Their VBII series like HNF361PV – 30A >>>> >>>> -Glenn >>> >> _______________________________________________ >> List sponsored by Home Power magazine >> >> List Address: [email protected] >> >> 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: [email protected] > > 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 >
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