For a 1 kW home backup solution, it would probably be better to just use a 12volt input inverter so your entire system could be 12v.
There are a lot of 1-2kw inverters that operate on 12v input. 24 or 48v input isn't really necessary until you get up into the 3-5 kW inverters. One less power conversion step, and you can use the vehicles' accessory 12v battery as a "mini buffer" instead of having to have your own 24v buffer battery. Having said that, I do have a 24v home backup power system, with an inverter that can run my well pump (2.5 kW continuous, lots of surge draw), but I'm taping my (130v) truck battery pack with a 500w DC2DC power supply that goes from 130->24v to keep my 2kWh "buffer" battery topped up.] But since I have a DIY conversion, access to pack voltage is easy, and it's in the right range for the power supply I found [ Meanwell SD-500H-24] [Alternatively, if you do have 2 EVs, you could use each vehicle to charge one 12v battery, and then use those two 12v batteries in series to get 24 volts, and have 2kW of input power....] Jay On 8/20/19 1:51 PM, Willie via EV wrote: > > > On 8/20/19 12:17 PM, Lee Hart via EV wrote: >> From: Willie via EV <[email protected]> >>> Subject: [EVDL] sources for 12vdc to 24vdc converters >>> Can anyone suggest? Looking for 1kw or larger. >> >> Seems like something you would be found for long-haul truckers. Many >> of their accessories are 24vdc, but some truck only have 12v systems. >> >> How long do you need that 1kw of power? If short-term, how about two >> 12v batteries in series? In a vehicle, one at a time could be charged >> by the vehicle's 12v system. Use a switch or contactor to swap back >> and forth, alternately charging one then the other, while the pair of >> them continuously power the 24v load. > > 100% duty cycle. I'm exploring using Enphase M215 micro inverters > powered from an EV's 12v DC-DC following this scheme: > https://teslamotorsclub.com/tmc/threads/powerwall-2-0-backup-runtime-extender.126358/ > > and the suggestions of others here. > > This will be but a piece of a home backup power scheme. It can > supplement a PowerWall or some other micro grid. Suggestions on other > minimal micro grid schemes solicited. One attraction of the micro > inverters is that they will semi-gracefully shutdown when demand is low. > Also, the modularity. Not enough power? Just add another EV. > > I'm not sure the micro inverters (for 60 cell panels) will do well with > 24v; I'm seeking an "upverter" with adjustable output. > > I haven't found specifications of the capacities of DC-DCs on various > EVs. I suspect they will all supply at least 1 kw. > > Thanks! > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Please discuss EV drag racing at NEDRA > (http://groups.yahoo.com/group/NEDRA) > -------------- next part -------------- A non-text attachment was scrubbed... Name: pEpkey.asc Type: application/pgp-keys Size: 2448 bytes Desc: not available URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20190820/c5a8b09f/attachment.key> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
