Thanks for the suggestions! I don't think I'm up to hacking together a controller. Hacking a communication protocol _might_ be a possibility.
I have thought about the idea of a dedicated electric motor to run the compressor...and trading inefficiency for simplicity might be something I'd go for. A couple more details...it'll be going in a 1964 1/2 Mustang that will retain its V8 ICE system and have an electric motor (probably HPEVS AC-35x2) going to a front-wheel-drive something-or-other. The leading candidate for the battery pack right now is a 22 kWh Leaf-based pack from Hybrid Auto Center, which should be easily capable of delivering sustained 20 kW with peak loads of 150 kW. I'm guessing range is going to be roughly not dissimilar to a Volt's...so, even with a 4 kW load for climate, I should still typically have enough range for all-electric driving, plus the V8 will be there when needed. ...I should add, another option that I've thought of but rejected is to run the air conditioner off the V8...but that would require the V8 be running any time I wanted cool air...which, in Phoenix, is half the year. But if it's running off the electric system, even if the batteries run low, I can use a minimal amount of regen to put charge back in the EV half. Might not be all that great for fuel economy...but most of the time it's going to be running in electric mode, and most of the time that the V8 is running the electric motor is still going to be doing most of the acceleration, so I'm not overly worried about burning an extra gallon or three over the course of a year. With the Prius route, what would be involved in hacking the communication protocol? And, the other direction, to stick a motor on a traditional unit, how big a motor would be ideal? Thanks! b& On Jun 10, 2015, at 3:29 PM, Joe <jya...@gmail.com> wrote: > I'm on my 4th iteration of air-conditioning scheme. The latest is building a > controller to run a 2nd gen prius a/c compressor. I have a thread going on > DIYecar here: > http://www.diyelectriccar.com/forums/showthread.php/diy-controller-04-09-prius-c-140346.html > > It's worked well so far at up to 105F outside despite speed limitations (due > to only a 144v pack) and power draw was only about 1.5kW. I just got it > working a few months ago so we'll see if it lasts the summer. > > Just some initial thoughts, I spent a lot of time/money flushing the hoses > and heat exchangers to get all the PAG oil out (eats at the motor windings > apparently). Also spent extra money on having new hoses made. Since you'll > be starting from scratch, you won't have to do either if you go the prius > compressor route. Also, if you'd rather avoid hacking a controller together, > you could hack the communication protocol to the 3rd gen prius compressor > which has its controller built in. > > Previous attempts were: > - ice water and a fan. was easy to try, but laughable for phoenix. > - use a single phase compressor out of a 5000 BTU window a/c unit with a > homemade inverter - not enough cooling capacity, need more like 10k-12k > BTU/hr. > - use a 3.5 HP treadmill motor to run the original a/c compressor. Failed > miserably, not enough power to even get it turning past a few RPM. > - use a 5 HP single phase 240VAC air compressor motor to turn the original > a/c compressor powered by a homemade 240VAC single phase inverter. The motor > is readily available, so reasonably cheap. This setup worked well from a > cooling perspective, but terribly inefficient and drew 3-4 kw on the hottest > days and not much less on the warm days. My electronics failed on its second > summer, so I spent the winter working on the prius a/c project. > > A friend of mine has a porsche and belt drives his compressor off the tail > shaft of the drive motor. It was easy to do, but is about as inefficient as > my attempt to use a second motor to drive the original a/c compressor. And, > gotta rev the motor while at a stop light to keep the compressor going. > http://electricporsche924.blogspot.com/2014/09/ac-update.html > > Joe > > On Wed, Jun 10, 2015 at 2:44 PM, Ben Goren via EV <ev@lists.evdl.org> 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://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/NEDRA) > > -------------- next part -------------- A non-text attachment was scrubbed... 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