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
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, MorRyde pin box
2017 3500 Dodge Maxi DRW 4X4, Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, etc.
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.
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.
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.
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.