Fortunately, the owner is pretty handy and is willing to live with any negative consequences. That said, I want to offer him something as simple and bulletproof as possible. I am walking into this with eyes wide open, for sure.
Jason Szumlanski Principal Solar Designer | Florida Solar Design Group NABCEP Certified Solar Professional (PVIP) Florida State Certified Solar Contractor CVC56956 Florida Certified Electrical Contractor EC13013208 On Tue, Apr 23, 2024 at 5:47 PM Dave Angelini Offgrid Solar via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote: > Not being helpful but I walk away from these. It will come back to you. > > *Dave Angelini Offgrid Solar > "we go where powerlines don't" > <http://members.sti.net/offgridsolar/>https://offgridsolar1.com/ > <https://offgridsolar1.com/> <http://members.sti.net/offgridsolar/> > e-mail offgridso...@sti.net <offgridso...@sti.net> > text 209 813 0060* > > > On 2024-04-23 2:40 pm, Jason Szumlanski via RE-wrenches wrote: > > I have an off-grid client who is working on replacing old equipment at a > cabin. He has a lot of 12 volt distribution in the house for lighting, > fans, and a 12 volt refrigerator. He also has 120 volt AC loads that run > through a separate distribution panel where the only source is a 2000 Watt > Honda generator. There is no inverter present. The batteries are charged > through a Trace C40. > > He currently has a few ancient solar panels and a struggling Bank of AGM > batteries. It's time for an upgrade. I can easily supply enough PV power > for what he needs. He currently has a 9 kilowatt hour battery capacity that > he was happy with when the batteries operated optimally. Nonetheless, I > would probably future-proof him with a 10 to 15 kilowatt hour LiPo to > double or triple his usable capacity. > > For convenience, obviously it would be nice to have an inverter to > eliminate or reduce the generator requirement. But he seems committed to > keeping his 12 volt distribution because it would be costly to replace > fixtures. I think he would consider replacing the 12 volt refrigerator if > he has an inverter. > > He definitely wants LiPo batteries. > > I don't like the idea of 12 volt direct from a battery plus connecting an > inverter to that same battery. It is going to be hard to measure and > monitor things. > > I am thinking about using a 48 volt battery with a single phase 120 volt > inverter, getting him to change to a 120 volt refrigerator, and using a DC > converter to give him somewhere in the range of 100 amps at 12 volts for > his existing DC lighting and fan loads. Is this a bad idea? Should I stick > with a 12 volt battery system? He does have a tiny 12 volt pressure pump > which might be an issue for the converter. I'm not sure. I am a bit worried > about the efficiency loss and capacity of DC converters and not sure how to > size it. > > Jason Szumlanski > Florida Solar Design Group > > > > > > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > >
_______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
