From: Willie via EV <[email protected]> >> How long do you need that 1kw of power? If short-term, how about two 12v >> batteries in series?
>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. There you go. Buy a second Tesla. :-) Connect their two 12v DC/DCs in series. :-) >I'm not sure the micro inverters (for 60 cell panels) will do well with >24v; I'm seeking an "upverter" with adjustable output. There may be some problems powering a microsine with a DC/DC or battery. They expect a PV panel, which looks like a current source. It will be using an MPPT algorithm to try to find the best current the PV can supply (regardless of its voltage at the moment). It may not be "happy" with a voltage-source supply like a battery or DC/DC. I have a Trace MS100 microsine inverter on my 24v PV panels. When the PV voltage drops under 20v, it shuts down even though the panels can still provide about 1 amp at that voltage. I tried connecting the panels to three 6v batteries (18v). The PV panels would happily charge them to about 22v with no other load. But the microsine did not work when I connected it to the PV panels + 18v battery. The voltage was in range (about 22 volts); but the microsine would be off for 5-10 seconds, then turn on and ramp up the power to just under 100w over a few seconds; then shut down, wait another 5-10 seconds, and repeat. This was not a useful way to generate power. > I haven't found specifications of the capacities of DC-DCs on various EVs. > I suspect they will all supply at least 1 kw. I think you're right. They all seem to have 50-100 amp DC/DC's, presumably to simulate the 60-100 amp alternator in most ICE cars. -- Excellence does not require perfection. -- Henry James -- Lee A. Hart http://www.sunrise-ev.com _______________________________________________ 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)
