We don't have one "catch all" aftermarket AC system that addresses all of these concerns:
1) Cost
2) Weight
3) Being able to sit for more than over night
4) Reliability (IE dead batteries)
5) Low fuel usage
APUs cost a ton and still use fuel, plus they add weight and take frame rail space. Most battery based solutions are $5k+ and don't offer cooling much longer than 7-8 hours. Some guys run window units but can have dead batteries in the morning. If you run 4 extra batteries isolated that's a ton of extra weight and cost. My idea consists:
Maxwell ESM - $920 USD group purchase (contact me for info)
3 x Duracell AGM batteries from Sams Club - $180 each = $540 (these are rebadged Deka Intimidators which are VERY good batteries)
Engine capable of optimized idle or similar (Detroits, do other engines do this?)
Simple "window" AC unit for now, aftermarket in the future (help me out with this, can be either 12v or 120v)
I'm still looking for the last one, that is cost effective and reliable as well as efficient. EER above 12 would be nice. Everything that is efficient is r410a based, and that will not last in our environment, too much pressure.
My idea is as follows:
Turn on engine fan and max out AC for last 5 miles, park away from any idling trucks or hot asphalt. Close curtains and some guys run a sheet off the top bunk. Insulate windows with those silver sheets. Pop the hood open a bit to let the heat escape. Turn on parked AC, enable optimized idle, and go to bed. In detroit calibration tool you can change everything about optimized idle, when it comes on, how long, summer rpm, winter rpm etc.. I would enable optimized idle to come on at 11.5 battery volts for two hours. The ESM is essential for this, because you will never kill your batteries, and the battery volt drop will not affect your inverter or the AC. On a regular setup it will kill them without isolation.
To me this is a very effective setup concerning cost, weight, and reliability. Fuel useage would be a fraction of what it was, and would be far less than most APU setups. Weight would be about the same as a regular 4 battery setup.
Parked AC solution - I have an out of box idea
Discussion in 'Trucks [ Eighteen Wheelers ]' started by allan5oh, Apr 18, 2014.
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My Honda EU3000is is a total of $3k, including a rooftop AC that will freeze your butt out of the truck if left unchecked, a small heater for winter, and a battery charger.
Runs 12hrs on 2 gallons of gas, has a 3.6 gallon tank built in. Anywhere sells gas, and I carry a few extra gas cans.
Quieter than any APU, and can run for days on end.
No insulated curtains needed.....
Martin -
Where do you mount it?
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I've seen those Honda generators, usually mounted to the catwalk. Generally nice and quiet, though it doesn't hook into the existing HVAC equipment, can be a blessing or curse.
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I firmly believe in redundant systems. AC clutch goes out on the truck, fire the generator up and carry on in Arizona, in August.
Heater motor quits, heater core leaks, and so on, fire the generator up and run the electric heater.
So on and so forth
MartinStuka Thanks this. -
Now if they'd run tank heaters, and perhaps incorporate a small pump and an additional crossover to circulate fuel through the system so that the stuff in the lines and filters can't gel in the Winter months, that would be pretty fly. -
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Personally, I've been looking into building a battery apu using an 8000btu portable a/c, 2-3k inverter, and 4-5 agm batteries. 8k btu might be overkill, but it might also be more efficient. Upside is that i wouldn't have to worry about harmful emissions, noise (other than a/c), or buying fuel (which gets expensive over time). No major alterations for setup either. Carrying weight would be less than or comparable to a diesel apu but definitely heavier than running a genset. The downside is that you'd have to charge the batteries before each use, which shouldn't be a problem during a regular day of driving. You're also limited by the amount of operation hours before you'd have to charge batts. So if your breaks are longer than 10hrs, then this might not be a feasible alternative.
Also unknown is how effective this would be during winter operation. A typical block heater uses 1500-1800 watts. That coupled with a cabin heater might decrease operational hours. Haven't done the calculation for that so I'm just guessing. Or just buy a heavy duty sleeping bag, some down comforters, and bear the cold....which actually isn't bad in 30 degree temps. lolLast edited: Apr 19, 2014
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