What roof top air conditioner are you using? - Page 3 - Ford Transit USA Forum
Reply
 
Thread Tools
post #21 of 40 (permalink) Old 01-06-2017, 10:32:PM
Member
 
Join Date: Jul 2015
Location: SW Montana
Posts: 41
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Quote:
Originally Posted by WhereDoIgoFromHere View Post
If you download the Heat loss calculator and look at the numbers, I think the heat loss from a well insulated van could be reduce by 4/5's to ~ 3,000 BTU's / HR. But probably still to much amp draw to run through the night on battery power. So no boon-docking with air conditioning without a generator. It would take a minimum of a Honda 2000?

On a really hot day it could supplement the vehicle air conditioning while driving with an alternator to battery charger running.

How long does the compressor cycle on?

http://www.buildagreenrv.com/design-...n-conversions/
Hi,
The heat loss calculator is mine -- happy to answer any questions about it.

Couple of things to bear in mind when using it for heat gain (AC) are that people, pets, cooking etc. add to the heat gain. This is a plus when heating, but a minus when cooling. Heat gain per person is about 300 BTU/hr depending on how active they are.

The other thing is direct solar gain through windows. This can be a big swinger -- for a window in direct sun with no shade on it, it can be 200+ BTU/hr per sqft of window. So, well fitted reflective window shades are a must -- even better if you can shade the outside of the windows.
Of course, parking in the shade (if you can find it) makes a big difference.

One solution that involves some DIY is to adapt a small room AC to the van. Something like this one: https://www.amazon.com/Frigidaire-FF...+small+room+ac
Its a SEER 11, which is pretty good, especially compared to RV AC units.
The 5000 BTU/hr should be OK for a well insulated van with good shades on the windows -- but, it might take a while to catch up if the van starts out hot.
I've seen youtube videos from people who have adapted this kind of AC.

If your steady state heat gain is (say) 3000 BTU/hr, and you have a SEER 11 AC (COP = 3.22, efficiency = 322%), then the steady wattage would be (3000 BTU/hr)(1/3.412 BTU/hr/wat) (1/3.22) = 273 watts. This would be an average of (273 watts)/(12.5 volts) (1/0.9 inverter efic) = 24 amp. Or, 24 amp-hrs per hour of operation when producing an average of 3000BTU/hr of cooling. Maybe something that would be workable without shore power, but a BIG house battery, and operating only part of the day.

Specs here: http://www.frigidaire.com/Home-Comfo...AC/FFRA0511R1/
The spec says 450 watts when cooling at 5000 BTU/hr, so good agreement with calc above.

Gary

Last edited by GaryBIS; 01-06-2017 at 10:37:PM.
GaryBIS is offline  
Sponsored Links
Advertisement
 
post #22 of 40 (permalink) Old 01-06-2017, 10:57:PM Thread Starter
Member
 
Join Date: Dec 2016
Posts: 46
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Gary,

Nice job on the Heat Loss Calculator and your website. Lots of great information.

How many amp hours per hour of operation would you estimate the Mach 8 to draw while running on low? Do they give enough information to estimate that number? http://www.airxcel.com/coleman-mach/...h-8/mach-8-cub
WhereDoIgoFromHere is online now  
post #23 of 40 (permalink) Old 01-06-2017, 11:16:PM
Senior Member
 
Join Date: Apr 2016
Location: mississippi
Posts: 658
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 152 Post(s)
i am boondocking with air conditioning at least a couple nights a week with a van insulated to R-9, a 440 AH battery bank driving an inverter, charged with 650 watts of solar and a 60 amp battery to battery charger, plus a backup 100 amp charger built into the inverter that runs on shorepower 1 or 2 nights a week in a campground to make sure the batteries are staying fully charged all week because driving and sun light may not always be enough.

over the road truckers are doing this every night because the law says they cant run there engines at night, so i have loosely based my electrical system on there system, but about the only real difference with my system is i have solar and drive less some days.
some info on truck Auxiliary Power Units: http://www.trojanbattery.com/pdf/TRN...aper0910FL.pdf

2016 transit cargo 250 MR, LWB, 3.5 eco, 3.31 limited slip
Michael Ophus is online now  
post #24 of 40 (permalink) Old 01-07-2017, 08:04:AM Thread Starter
Member
 
Join Date: Dec 2016
Posts: 46
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
What air conditioner are you using?
WhereDoIgoFromHere is online now  
post #25 of 40 (permalink) Old 01-07-2017, 09:16:AM
Senior Member
 
Budsky's Avatar
 
Join Date: Aug 2015
Posts: 1,076
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 354 Post(s)
Quote:
Originally Posted by GaryBIS View Post
Couple of things to bear in mind when using it for heat gain (AC) are that people, pets, cooking etc. add to the heat gain. This is a plus when heating, but a minus when cooling. Heat gain per person is about 300 BTU/hr depending on how active they are.

The heat gain from pets is significant- I built an 8x12 portable wood cabin that was very well insulated with a small propane radiant/open flame heater..
I was surprised that with two 55 lb dogs and two people in it I found we needed essentially no heat until below 40F!
Dogs, of course have a higher body temp than humans.

"Beluga" 2015 350HD 3.2D, 3.73, EL, HR.
Budsky is online now  
post #26 of 40 (permalink) Old 01-07-2017, 09:21:AM
Senior Member
 
Budsky's Avatar
 
Join Date: Aug 2015
Posts: 1,076
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 354 Post(s)
Quote:
Originally Posted by Michael Ophus View Post
over the road truckers are doing this every night because the law says they cant run there engines at night,
In some places that is true- in others it is not.
Love's built a truckstop at an exit 2 miles from my home- outdoors on a quiet night there is a perceptible rumble from 100+ trucks idling.
I'm sure glad I don't live closer...many homes are almost right up on it- they were there first and I'd bet the owners are pissed!

"Beluga" 2015 350HD 3.2D, 3.73, EL, HR.
Budsky is online now  
post #27 of 40 (permalink) Old 01-07-2017, 10:14:AM
Senior Member
 
Join Date: Apr 2016
Location: mississippi
Posts: 658
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 152 Post(s)
Quote:
Originally Posted by Budsky View Post
In some places that is true- in others it is not.
Love's built a truckstop at an exit 2 miles from my home- outdoors on a quiet night there is a perceptible rumble from 100+ trucks idling.
I'm sure glad I don't live closer...many homes are almost right up on it- they were there first and I'd bet the owners are pissed!
the trucks may have only stopped for coffee, fuel or food, the law says they can not leave then idling more then an hour or two, when the truckers are asleep they have to shut them off! there may be exceptions to that law in extreme cold since diesels are hard to start when very cold and the fuel solidifies into wax.

sounds like you have the same zoning laws we have here: houses and mobile homes in close proximity.

2016 transit cargo 250 MR, LWB, 3.5 eco, 3.31 limited slip
Michael Ophus is online now  
post #28 of 40 (permalink) Old 01-07-2017, 10:40:AM
Senior Member
 
Join Date: Apr 2016
Location: mississippi
Posts: 658
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 152 Post(s)
Quote:
Originally Posted by WhereDoIgoFromHere View Post
What air conditioner are you using?
a 2 hose Whynter model ARC-141BG portable air conditioner 14,000 BTU. using a maximum of 10.8 amps at 120 volts AC, intake and exhaust floor vented on opposite sides of the van. powered by a Magnum Dimensions MS2012 inverter with an output of 16.7 amps at 120 volts AC.

2016 transit cargo 250 MR, LWB, 3.5 eco, 3.31 limited slip
Michael Ophus is online now  
post #29 of 40 (permalink) Old 01-07-2017, 10:48:AM
Senior Member
 
Budsky's Avatar
 
Join Date: Aug 2015
Posts: 1,076
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 354 Post(s)
Quote:
Originally Posted by Michael Ophus View Post
the trucks may have only stopped for coffee, fuel or food, the law says they can not leave then idling more then an hour or two, when the truckers are asleep they have to shut them off! there may be exceptions to that law in extreme cold since diesels are hard to start when very cold and the fuel solidifies into wax.
Define "the law". As far as I can tell here is no blanket (federal) law against idling.
In SC where I am under state law trucks are allowed to idle while the driver is sleeping or resting...or when outside temp is above 80 or below 40.

"Beluga" 2015 350HD 3.2D, 3.73, EL, HR.
Budsky is online now  
post #30 of 40 (permalink) Old 01-07-2017, 12:32:PM
Senior Member
 
Join Date: Apr 2016
Location: mississippi
Posts: 658
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 152 Post(s)
Quote:
Originally Posted by Budsky View Post
Define "the law". As far as I can tell here is no blanket (federal) law against idling.
In SC where I am under state law trucks are allowed to idle while the driver is sleeping or resting...or when outside temp is above 80 or below 40.
i have no clue? i told the local Trojan battery distributor that i wanted deep cycle AGMs for inverter use, i had wanted some 8Ds i picked out before hand but he said he had none in stock. he then said he had Trojan 'overdrive' group 31s in stock that all of the truckers used in there truck APUs, i got them at wholesale (i bought 6 of them) which is nearly half of what they sell for on amazon!

http://www.trojanbattery.com/markets/transportation/

2016 transit cargo 250 MR, LWB, 3.5 eco, 3.31 limited slip

Last edited by Michael Ophus; 01-07-2017 at 12:40:PM.
Michael Ophus is online now  
Reply

User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



  Similar Threads
Thread Thread Starter Forum Replies Last Post
Webasto Air Top 2000 STC PETROL (GASOLINE) won't start atoine Camper Vans and Conversions 14 Yesterday 10:39:PM
Roof vents barely moving air Thinksnow Ford Transit General Discussion 3 11-01-2016 12:36:PM
Air Conditioner output temp not adaquate mdrambler Ford Transit Troubleshooting 38 09-26-2016 08:01:PM
Roof Top AC Unit Johnny Camper Vans and Conversions 14 09-24-2016 12:00:AM
Roof top AC Mdnewfies Accessories and Add Ons 1 12-08-2015 04:18:PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off