Sometimes in the field I have run over 3000 feet of #22 hookup wire to run several hundred watts from my car for ham-radio camping using ground-return. See: APRS SWER Power Distribution <http://aprs.org/aprs-swer.html>
If your solar is a series string array, then the voltage is approaching 500 volts. The loss is I squared R so the loss at 500v is less than a 4th of what it is at 240v. Lets try #12 wire has a resistance of 5 ohms over 2000 feet, so the loss from say a 10 kW array (20 amps) is 2000W or a 4th of your power, but if you get to the 6 cent meter you get double the value so it is a net gain of 2. But that is 1 wire. If you used a perfect ground for the return. THe ground return might be a best case 10 ohms, but then that is in the wilderness. If both systems are near utilities which are firmly grounded then most of the current might flow through the low resistance utility grounds (but making an unsafe condition on loss of grounds). Just thinking... One other problem is that most string grid-tie inverters do not like to see any ground current and will trip (though this can be spoofed). Bob . On Sun, Mar 21, 2021 at 11:47 AM Lee Hart via EV <ev@lists.evdl.org> wrote: > Willie via EV wrote: > >> Hmm... If you're on good terms with your neighbor, you could run a > >> wire between houses and sell your excess power to him in the summer, > >> and he could reimburse you in the winter. > > > > That highlights a problem I have long considered but not found a viable > > solution to. I have one meter where my excess production is worth > > $.03/kwh and another where it is worth $.06. Unfortunately, the > > separation is about 1/3 mile. I would love to have the $.03 energy > > available to use (or sell) on my $.06 meter. A neighbor suggested a > > pair of high voltage transformers but I doubt the practicality. And I > > doubt I could afford the wire size necessary to do a few kw over that > > distance. My $.03 production is limited by my utility to about 15kw by > > the utility's transformer. > > 1/3 mile is not too bad. It would certainly be possible to run your own > power line for that distance, as long as it's all on your own property. > Transformers above 1 KW are over 95% efficient, and high voltage can cut > your wire losses to 1-2%. > > But the economics are another matter. If you have to buy the wire, > transformers, and supplies new, and pay someone to install it all, I > doubt it would ever reach payback. > > [Mad thought... Maybe Tesla's broadcasted power idea will make a > comeback. We know how to wirelessly broadcast power for limited > distances at not-too-terrible efficiencies. Given that solar power is > "free", imagine a subdivision where every home has PV, and either > broadcasts or receives to share power with their neighbors. No grid! > I'll bet the utility regulations weren't written to exclude selling > power when there are no physical ties!] > > Lee > -- > All children are born engineers. Watch them at play. They're not > just playing; they're experimenting, building and learning. That's > engineering! Then we get them in school and squash it out of them. > (Geoffrey Orsak, Southern Methodist University dean of engineering) > -- > Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com > > -- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > ARCHIVE: http://www.evdl.org/archive/ > LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20210321/84c8cdbb/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org
