All good ideas. thanks,
jay On Oct 20, 2010, at 11:56 AM, R Ray Walters wrote: > I second Allan's move to 48 v; that's usually what we've ended up doing in > very similar situations, to keep the existing 'monsta' cable. > Usually they have a dated mod sine inverter, so the upgrade to Outback > improves the system coming and going. > As much as I loved the SW series inverters, their time has come and gone. > They don't last forever, and even if parts are available, they're almost > $1200 to repair. > > R. Walters > r...@solarray.com > Solar Engineer > > > > > On Oct 20, 2010, at 12:37 PM, Allan Sindelar wrote: > >> Jay, >> When we faced this issue recently, we used it as an opportunity to upgrade >> to a 48V system. The obsolescence and lack of Schneider support for the >> SW4024 contributed to the logic of this approach. >> >> At 48V an MX60 will handle 3200 watts. >> >> Allan Sindelar >> al...@positiveenergysolar.com >> NABCEP Certified Photovoltaic Installer >> EE98J Journeyman Electrician >> Positive Energy, Inc. >> 3201 Calle Marie >> Santa Fe, New Mexico 87507 >> 505 424-1112 >> www.positiveenergysolar.com >> >> On 10/20/2010 11:58 AM, jay peltz wrote: >>> >>> Hi Ray et all, >>> >>> The customer has 200' of 4/0 direct buried with a 24v system, and is >>> running close to 60 amps now, and wants to add 6 more 215 watt modules. >>> So the issue has been to try and find a way around putting in another wire >>> ie digging a new trench through his yard. >>> >>> the client may be willing to try and see how it goes with the controllers, >>> at this point hes aware that it could blow up and its not a warranty issue. >>> >>> Will keep you up to date about what smokes or not. >>> >>> j >>> >>> peltz power >>> >>> On Oct 20, 2010, at 10:18 AM, R Ray Walters wrote: >>> >>>> Hi Jay; >>>> >>>> I'd second (3rd, 4th?) everyone else's comments that it probably isn't a >>>> good idea. >>>> I'd add that the diode will eat at least a volt, so that's not good for >>>> MPPT, or balancing. >>>> The one possible way to do this, might be to use a Vanner battery >>>> equalizer, which is designed to split an incoming charge source, and feed >>>> 2 batteries, without letting them >>>> "see" each other. I think they're only good for 24 v, though, so that >>>> might not work for your situation. >>>> The only other way I could see, is using a huge relay ( or paralleled >>>> relays) controlled by a C40 (or similar). You would lose both MPPT and >>>> PWM, and be back in the solar stone age (90s) though. >>>> >>>> TIme to pull out the 2 big cables, and pull 4 smaller ones? >>>> Have fun, I actually like retrofitting old off grid stuff; it presents all >>>> sorts of interesting challenges like this. >>>> >>>> R. Walters >>>> r...@solarray.com >>>> Solar Engineer >>>> >>>> >>> _______________________________________________ >>> 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 >> > > _______________________________________________ > 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 >
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