You hit the nail on the head. The migration of all our high-power systems to HV DC is the topic of my book (EV's, Solar', heatpumps, and all modern power supplies). Any power device that uses "variable speed" such as new airconditioners and other appliances are internally using 365 VDC which is a great place to dump cheap DIY solar. And to marry with our EV batteries.
Bob - Author http://aprs.org/Energy-Choices.html On Sun, Mar 21, 2021 at 12:48 PM jerry freedomev via EV <[email protected]> wrote: > Hi Peter and all,Earth tubes almost can't avoid moisture and molds making > air versions dangerous to breathe air from them. You really need a coolant > based system, not air.Minisplits are a far better solution and some work > directly from batteries now both in 48vdc and 365vdc nom.. I hear some > variable AC ones can work from batteries as just rectified anyway for the > variable speed inverter.I see a future where much of home high power loads > run on 365vdc nominal directly from home solar, batteries and EVs packs > both charging and using for home power with cheap DC-DCs pushing it where > you want it to go in or out of the EV.And as a microgrid sharing bus.Though > it's looking like V2G will be common next yr with VW and Lucid forcing > Tesla, others to compete. .Jerry Dycus > > On Saturday, March 20, 2021, 09:52:16 PM PDT, Peter VanDerWal via EV < > [email protected]> wrote: > > Bobby, have you done any research on Earth Tubes? Not just looking up > testimonials and anecdotes, but looked for actual studies? > > I was really yped about earth tubes for a while until I looked into them > and found a few studies. I found a lot of people claiming that all they > did was dig 2 foot deep trenchs and burried 30 feet of tube and 'Wow, what > a difference' > But the actual studies with measurements, etc. tell a different story. > > First of all you need to go a LOT deeper than 2 feeet, 6-8 foot minimum. > One study I found was done in India as I recall, they were studying using > Earth Tubes to cool a green house. > They used 4 tubes 100 feet long, 8 foot deep spaced 6 feet apart. The fan > used to drive the air through them consumed 400-450 watts and ran 24 hours > a day. It was effective at the begining of summer, but by the middle of > summer the output air temps had climbed to around 80 degrees, the green > house temps were closer to 90 degrees. > > I also read lots of feedback from individuals that were having problems > with mold due to condensation in the earth tubes. That is solvable, by > making sure the tubes angle down, away from the house and you have some way > to drain the moisture from them. > > My mini-split heat pump on the other hand uses about 1/2 the energy per > day to cool my house and output air temp is around 50-60 degrees an the > temp in the house stays below 76. I could get it cooler, but it would use > more energy and I'm comfortable at that temp. > > So the mini-split is more effective, for less energy and a LOT less work > to install. If you have to hire someone to dig the trenches, the > mini-split is probably cheaper. > > Sometimes the best solution is NOT the simplest solution. > > My PGP public key: https://vanderwal.us/evdl_pgp.key > > March 19, 2021 6:05 PM, "Bobby Keeland via EV" <[email protected]> wrote: > > > In a previous posting I said: > > <Unfortunately I’m still working on my solar > > <water heater, my battery backup for the solar > > <panels, earth tubes and many other > > <projects. > > > _______________________________________________ > 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/20210321/653bc786/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 > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20210321/40a635a5/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
