JC refrigeration AC or DC upgrade?
Just wondering if any of you could tell me whether I should buy the AC or DC conversion for my dometic rm2652. We are on shore power almost always except for traveling. Would the truck charge batt...
Forum Discussion
I'm late to the thread, as it looks like you've already made your purchase.
I have the 120V version in my truck camper, which uses 1.0-1.3kWh per day. I chose it because I have a native 48V bank, so it's being converted one way or the other, and I wanted the slightly extra cooling capacity.
The following is directly from their FAQ:
Our compressor pulls 90W on the AC side (not 96W). At the 56% duty cycle mentioned above, that works out to 1.209kWh/day, which is in line with what we've observed.
The DC compressor is advertised to pull 90W. At the mentioned 64% duty cycle, that's 1.382kWh/day.
By those numbers, the AC version is 13% more efficient. Inverter losses are usually a little under 10%. That indicates the AC version may actually be more efficient overall, even accounting for the inverter, but just like their FAQ says, it's more or less a wash.
I have the 120V version in my truck camper, which uses 1.0-1.3kWh per day. I chose it because I have a native 48V bank, so it's being converted one way or the other, and I wanted the slightly extra cooling capacity.
The following is directly from their FAQ:
Q. what is the duty cycle (run time) A in our testing @ 80F the AC compressor will run approx. 56% and the DC approx. 64%, that is not opening and closing the doors. So, this will vary some according to your usage
Q. which is most the power efficient 120V or 12V A. on paper the 12V is the most efficient @ 7.5A 90W, but it runs some slower than the 120V, so in the end they are practically the same. But if no inverter is on board then the 12V is still much faster than your gas/elect.
Our compressor pulls 90W on the AC side (not 96W). At the 56% duty cycle mentioned above, that works out to 1.209kWh/day, which is in line with what we've observed.
The DC compressor is advertised to pull 90W. At the mentioned 64% duty cycle, that's 1.382kWh/day.
By those numbers, the AC version is 13% more efficient. Inverter losses are usually a little under 10%. That indicates the AC version may actually be more efficient overall, even accounting for the inverter, but just like their FAQ says, it's more or less a wash.
