That is interesting, He is measureing 10 amps and at 240, that is 2500W, but still, a big difference from 1 HP. But then Amps is Amps and Volts is Volts and the product of a motor is not Watts but Volt-Amps.
So, maybe the 10 amps is not in phase with the volts and so there is only 1 HP of actual power even though there is 10 amps indicated and 240v indicated. If the power factor is that far off, no wonder the inverter is unhappy? I wish I understood this better. I never can remember. When our Utility meter calculated kWh, is that only the real WATTS portion and not the Volt Amps? Maybe we only pay for the real watts. And the Utility is stuck with the VA. No wonder they like to see unity power factor. Bob -----Original Message----- From: Jay Summet <[email protected]> Sent: Tuesday, August 20, 2019 5:00 PM To: Robert Bruninga <[email protected]>; Electric Vehicle Discussion List <[email protected]> Subject: Re: [EVDL] sources for 12vdc to 24vdc converters I'm not sure of the HP rating, but it draws 9-10 amps continuous at 240v, and surges up to 20+ amps briefly upon startup. I have a PowerJack 8000 inverter (more like a 3kW inverter that can handle a 5kW surge) to run it. https://www.youtube.com/watch?v=J1rrgxM9Nn8&list=PLmHP4lUqxKmt2fgNM8CIAQ4CruRduhWx0 Jay On 8/20/19 4:02 PM, Robert Bruninga wrote: >> that can run my well pump (2.5 kW continuous, lots of surge draw)... > > I don’t have a well pump but a guy bought one of my 120:240 VAC > autotransformers (800W) and said his pump was only a 1/2 HP pump. So > 800W > should do it. Even 1HP would only be under 1 kW. > > So 2.5 kW for a well pump seems large?, But then, I don’t have one. > > Bob > > -----Original Message----- > From: EV <[email protected]> On Behalf Of Jay Summet via EV > Sent: Tuesday, August 20, 2019 2:02 PM > To: [email protected] > Cc: Jay Summet <[email protected]> > Subject: Re: [EVDL] sources for 12vdc to 24vdc converters > > 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- >> e >> xtender.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/c5 > a8b09f/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) > _______________________________________________ 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)
