On the other hand, 330 VDC is the new "60". Its in evry modern universal power supply, its in solar and similar voltages are in all hybrids and EVs. Its even in your cell phone charger. It is very exciting to see all these systems come together into cross compatible energy systems. My book talks about these disruptive technologies that are invisible to the average consumer, but all have HV DC as their fundamental common characteristic.
Running something at 330 VDC can go TEN times as far through the same wire as at 120v. I demonstrated running a few hundred watts over 3600 feet using only #22 hookup wire and ground return from my Prius to a remote operating position on a hill top. Yes, definitely dangerous, but it is worth learning about. When I was a kid the Cub Scout handbook had a requirement to build a two-tube radio set with 150v power supply. This is for 8 year old kids... But using a non DC rated switch can burn your house down, so it does take a new way of thinking... Bob, WB4APR Author http://aprs.org/Energy-Choices.html On Tue, Feb 18, 2020 at 4:49 PM jkenny23 via EV <ev@lists.evdl.org> wrote: > The casual discussion of dealing with direct connection to the HV battery > scares me a bit. I get that you're all DIY EV enthusiasts with experience > dealing with high voltage, high power, but I'd highly recommend staying > away > from any direct connections to the HV battery. I like the idea of the low > voltage "buffer" battery that then automatically connects to the on board > charger. As mentioned, you could make it automated. > > I'd recommend going with a higher voltage buffer battery, e.g. 48V (14s) > Li-Ion, as 24-48V inverters tend to be more efficient (the lower the > conversion ratio to 120V, the better, plus reduced I^2 * R losses in your > cabling). You can use low cost pseudo-MPPT chargers like the MPT-7210A, for > up to 600W of output power, and a boost type architecture, so your panels > would operate around 20-30V as is standard, and the MPT-7210A would boost > to > 48V. I basically did this, though in a very roundabout way, for charging my > Leaf, mostly as proof of concept. I had a 160W panel on my patio, charged a > 1.8kWH Li-Ion 48V battery with the MPT-7210A, and used a 1.5kW inverter to > charge the Leaf via the stock 120V charging cable. The battery got > uncomfortably hot by the time it was depleted (it was made of recycled > cells, which don't like discharging over 0.5C rate, and I was pushing it at > nearly 1C). Here's a post about the solar/battery charger side, and a video > about the battery/Leaf charging side if you want more info: > > https://secondlifestorage.com/showthread.php?tid=4161&pid=22926#pid22926 > https://secondlifestorage.com/showthread.php?tid=4436&pid=27117#pid27117 > https://www.youtube.com/watch?v=b3f68mS7IOk > > -- > Sent from: http://electric-vehicle-discussion-list.413529.n4.nabble.com/ > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > ARCHIVE: http://www.evdl.org/archive/index.html > INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Please discuss EV drag racing at NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20200218/91018320/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/index.html INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
