Almot wrote:
76 watts is low in terms of grid power.
In terms of battery use it's a different picture. This translates into 7A post-inverter. On a hot day you would need +80 AH from battery, I don't think this could be called a low use, in terms of battery capacity.
But on grid it doesn't matter, you're not using battery.
Umm.. Your "forgetting" one small "detail" in your calculations..
Most RV fridges USE 12V from your battery to run the control board electronics and the gas valve..
That is about to the tune of 12 Ahr of battery per 24 hrs for most RV fridges.
So, 80 Ahr - 12 Ahr = 68 Ahr making a Home fridge conversion a bit easier to consider using your "figures"..
Now, to put this into real life, you are assuming the fridge compressor runs a lot longer in hot weather..
I have NOT seen my fridge run longer, pretty much from 60 F to 110F inside the trailer my home fridge seems to run 20-22 minute on and 38-40 minutes off..
Additionally if one was smart enough they do like I did, choose an inverter which is smart enough to power down when the compressor is off and power up when the compressor turns on..
Saves an additional 12 Ahr there so we can take the 68 Ahr - 12 Ahr =56 Ahr of capacity needed..
Making it even easier to justify a home fridge..
That is how I can get away with one pair of 6V GC2 batteries which have 210 Ahr capacity and half of that (50% DOD) is 105 Ahr..
105 Ahr - 56 Ahr = 49 Ahr left..
My furnace uses 8A, At 50F (the coldest I have needed the furnace) the cycle typically is about 15 minutes run time per hr..
That is about 2A per hr, for 24 hrs that is 48 Ahr..
In reality, since I am not "camping", I am "overnighting" my furnace is only running over night so say 8 hrs (usually 6-7 hrs) that is only 16 Ahr..
49 Ahr - 16 Ahr = 33 Ahr..
All of my lights are LED so with every single one turned on there might be a whopping 4 A draw, run those 2 hrs (which is a lot since in the summer it gets dark around 10 PM) that would be 8 Ahr..
33 Ahr - 9 Ahr = 24 Ahr left..
I don't typically use a water pump but that can be figured in also..
Say three 15 minute showers (three people) about 3/4hr of water pump at say 8A.. That would be 6Ahr of use..
24 Ahr - 6Ahr = 18 Ahr left..
Entertainment..
TV, 24" LED backlight TV is about 40W or about 3.3 Ahr per hr of use (I don't bother with since I am overnighting) ..
So say 2 hrs of use that is 6.6 Ahr.
18Ahr - 6.6Ahr = 11.4 Ahr left..
So WHY is so hard to get you RV fridge hugger folks to understand that a home fridge CAN be easily used for boondocking?
Two pairs of 6V GC batteries could be used and you would be able to go 48 hrs or two days without the need to recharge..
Add 300W-400W of solar and two pairs of 6V GC batteries most likely could extend that to nearly 4 days without much effort or running a gen..
But in reality, many so called boondockers USE A GENERATOR ANYWAYS so why make such a darn negative fuss about it..