One more thing to add to the A/C driving off the motor pilot shaft. I do not use battery power to drive the motor at the same time the A/C comes on or even when the electric heaters come on. How do I do this? This is how:
A A/C or electric heater does not run all the time. In a A/C system there is a High Pressure and Low Pressure Switches. In a heater there are also high temperature limit switches. The on dash switch controls a A/C relay which is also control by the high and low pressure switches. Even if you turn on the dash A/C switch, the A/C pump may not engaged because the pressure may be up and the low pressure switch is not turn on which controls the A/C pump electric clutch. Only the blower fans come on when you turn on the A/C or Heater control switches. So as to prevent either the heater or A/C to operate, I install or use a limit switch that comes with the Curtis 5K accelerator control. The dash A/C and or Heater control circuit is control by this limit switch. When I depress the accelerator pedal, the limit switch turns off the A/C or Heater control circuits and when I let up on the accelerator, it turns these circuits back on. In the A/C system, many times it does not effect the A/C cooling, because the A/C pump may be up to pressure and the clutch is disengaged anyway. So far since installing this control system in 1980, I never had these units run by the main battery power, except for testing only. Roland ----- Original Message ----- From: Bill Dube via EV<mailto:[email protected]> To: Chris Tromley<mailto:[email protected]> ; Electric Vehicle Discussion List<mailto:[email protected]> Sent: Thursday, June 11, 2015 8:03 AM Subject: Re: [EVDL] DIY EV air conditioning? You would need a lot of ice, hundreds of pounds, to provide the refrigeration needed. 12,000 BTU/hr is the rating of a typical car air conditioning unit. This is literally equivalent to one ton (2000 lbs) of ice per day. "Hacking" some OEM EV air conditionaing, like from a Prius, is likely the best option. There are also inverter driven (VFD) home compressors that would likely work as well, but aren't as rugged as the OEM EV air conditioning compressors. I would investigate small, single phase input, three phase output, variable frequency drives (VFD) instead of building my own inverter from scratch. Like a TECO: http://www.surpluscenter.com/Electric-Motors/3-Phase-Motors/Variable-Frequency-Drives/1-HP-TECO-VFD-115-VAC-1PH-INPUT-3PH-OUTPUT-11-3424.axd<http://www.surpluscenter.com/Electric-Motors/3-Phase-Motors/Variable-Frequency-Drives/1-HP-TECO-VFD-115-VAC-1PH-INPUT-3PH-OUTPUT-11-3424.axd> Likely will run nicely from DC. Certainly cheap to try. Bill D. On 6/11/2015 6:35 AM, Chris Tromley via EV wrote: > If A/C demands aren't great, I've wondered if you could get away with a > cooler, some ice packs, some water to carry the "cold" and a circulation > pump to run the water through a tubing network installed in a seat cover. > I know it sounds crude, but that's how NASA cools astronauts. Almost all > the energy would come from the freezer that chills the ice packs. Could be > inconvenient, but if the car is for commuting, just throw ice packs in the > fridge at work. > > Chris > On Jun 10, 2015 5:44 PM, "Ben Goren via EV" > <[email protected]<mailto:[email protected]>> wrote: > >> So, I can imagine all sorts of ways that one might run air conditioning in >> an electric vehicle, but I'm sure others have actually tried and done >> different ways and likely figured out the best general approach. >> >> Any of those others reading these words and care to point me in a good >> direction? >> >> This'll be starting from scratch in a vehicle that never had air >> conditioning in the first place but for which both factory and aftermarket >> air conditioning systems are available that run off of a pulley on the ICE >> engine. >> >> Thanks, >> >> b& >> _______________________________________________ >> UNSUBSCRIBE: >> http://www.evdl.org/help/index.html#usub<http://www.evdl.org/help/index.html#usub> >> http://lists.evdl.org/listinfo.cgi/ev-evdl.org<http://lists.evdl.org/listinfo.cgi/ev-evdl.org> >> For EV drag racing discussion, please use NEDRA ( >> http://groups.yahoo.com/group/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/20150611/fbac298a/attachment.htm<http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150611/fbac298a/attachment.htm>> > _______________________________________________ > UNSUBSCRIBE: > http://www.evdl.org/help/index.html#usub<http://www.evdl.org/help/index.html#usub> > http://lists.evdl.org/listinfo.cgi/ev-evdl.org<http://lists.evdl.org/listinfo.cgi/ev-evdl.org> > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/NEDRA<http://groups.yahoo.com/group/NEDRA>) > > _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub<http://www.evdl.org/help/index.html#usub> http://lists.evdl.org/listinfo.cgi/ev-evdl.org<http://lists.evdl.org/listinfo.cgi/ev-evdl.org> For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA<http://groups.yahoo.com/group/NEDRA>) -------------- next part -------------- An HTML attachment was scrubbed... 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