|
11-03-2019, 05:37 PM
|
#1
|
Established Member
Join Date: Nov 2018
Location: Vancouver
Posts: 44
M.O.C. #22974
|
Inverter
On my 3402 Montana i just installed a new 2000 W inverter and 4 -6 v batteries . Also installed a Victron 702. Great battery monitor and a must with an inverter .Future plan is to replace the Norcold 1200 with a samsung house fridge. What im curious about is those that have an AC fridge what kind of Draw there getting from the compressors. I find running the norcold non compressor fridge draws an insane amount of battery. Ok when driving with truck alternater helping . But without, the battery bank can barely hold 11 v.
I dont need an explanation on the math im just interested in what others are getting for draw on there household fridges so that i can campare b4 buying one. thanks
|
|
|
11-03-2019, 08:35 PM
|
#2
|
Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,315
M.O.C. #4831
|
Most of use the propane side of the refer when boondocking. The Norcold/Domectic dual mode refers use too much electricity to run it off an inverter.
Here us a discussion about residential refers and their power consumption. Take a close look at John Kohl's experience. It may make you rethink the residential refer.
http://www.montanaowners.com/forums/...ad.php?t=79314
__________________
Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
|
|
|
11-03-2019, 08:40 PM
|
#3
|
Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
|
When we were into boondocking we had seven solar pannels, six golf cart batteries and a 4500 watt inverter. We still never tried to run the frig or the water heater on electric. The micro wave and everything else took all we had, particularly in the winter.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
|
|
|
11-04-2019, 04:05 PM
|
#4
|
Montana Master
Join Date: Nov 2007
Location: Kville
Posts: 2,865
M.O.C. #7871
|
We had a MH that had a Whirlpool in it, used about 3 amp with the compressor running.
|
|
|
11-04-2019, 04:16 PM
|
#5
|
Established Member
Join Date: Nov 2018
Location: Vancouver
Posts: 44
M.O.C. #22974
|
Thats 3 anps AC. Do u know what the draw on the batteries was.?
|
|
|
11-04-2019, 04:58 PM
|
#6
|
Montana Master
Join Date: Sep 2013
Location: Pensacola (mail forward service)
Posts: 3,198
M.O.C. #13740
|
Battery draw on most inverters nowadays is more than 10 times the ac draw since they are roughly 90% efficient. So if the fridge draws 3 amps max of 120vac or 360 watts, what you will see off the dc side is 30 amps or 360 watts on 12vdc PLUS that extra 10% for a total of about 33 amps of 12vdc.
__________________
2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
|
|
|
11-04-2019, 05:21 PM
|
#7
|
Established Member
Join Date: Nov 2018
Location: Vancouver
Posts: 44
M.O.C. #22974
|
Your math is correct. My new almost 500 Amp hr battery bank can deal with that draw overnight. Whats happening with my Norcold 1200 on AC draws my batteries down to 11 V. From my experience in marine installiations u will kill the batteries in short order with that kind of sustained pull.
|
|
|
11-04-2019, 05:33 PM
|
#8
|
Established Member
Join Date: Nov 2018
Location: Vancouver
Posts: 44
M.O.C. #22974
|
Forgot to mention my boat batteries can maintain 12v or more with a 20-30 amp pull untill about 50% gone
|
|
|
11-17-2019, 03:09 PM
|
#9
|
Montana Fan
Join Date: Jan 2019
Location: TROY
Posts: 132
M.O.C. #23248
|
I agree with the other poster, you would be well served manually switching the fridge over to gas when parked.
I don't like having the propane on while driving, from your experience it sounds like installing a 2000W inverter to run the fridge on electric while driving may be a viable solution? I have a single 12 v marine battery.
|
|
|
11-18-2019, 03:39 PM
|
#10
|
New Member
Join Date: Aug 2017
Location: Hinton
Posts: 2
M.O.C. #20320
|
I had the 4-door 2118 model fridge updated to JC Refrigeration Dutch Aire 12 volt system this past summer. Works very well. The specs say it draws 5.5 amps at 12 volts, 67 watts, when the compressor is running. They estimate it's running 56 percent of the time.
|
|
|
|
Thread Tools |
Search this Thread |
|
|
Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
» Recent Threads |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|