Originally Posted by sailorchic34
Actually my 120V fridge uses about 2.5 amps per hour. Sure it uses 14 amps (at 12V DC) when its running, but it only runs 2-2.5 minutes per 12 minutes. That's in the hot delta
by the way. While everyone said it would not work, the blonde engineering chic, though otherwise.
Duty cycle is the key. A 12V fridge runs quite a bit, 20 to 40 minutes per hour. A 120V runs only a few minutes at a time and about 10 minutes per hour.
For a given size box the amount of BTU's extracted would be the same. So energy use in watts per hour would be about the same for the standard compressor
It works just fine, thank you very much, on the hook. I carry all my electrical
loads with two solar panels
(130 and 100 watts).
I'll be running a small cooler style nova kool, while I agree that power use isn't that different, the tests by off-road guys indicate about 2.5 amps for it as well, but that way I don't need an inverter
. Prices vary widely, I'll be paying 589$, New with warranty, same compressor
as the built in. I prefer the simplicity without inverter
. I'll likely have a small generator(Honda 1000 or 2000w) for any ac needs. As I'm on an alberg 30
so space is an issue, the 2000 should run my battery charger
if needed but I doubt the 1000w can.
my cordless tools charge on dc directly(dewalt) so does my laptop(iGo charger
for an Asus laptop
, handles ac and dc, charged that way for 9 months of hard use on a motorbike so it's reliable.
I have a dc 18650 lithium battery charger, for my electronic cigarette, flashlight etc. The flashlight also had the ability to charge from dc directly as well.
With the ease of dc charging
these days I have no need for inverter.
One thing I am adding is a Usb hub with 5v higher power charging
, my AA battery charger, phone
, and more can all charge on that, the iGo has a single Usb out right on the charger but with two aboard I want more ports
Standardizing(Usb, AA and 18650 only) and one brand of cordless tools with a full lineup of tools both 12v and 20v on a single charger lets me cut way back on the usual rats nest of ac chargers and wires.
With that in mind the dc fridge makes most sense to me.
Different approaches are everywhere, downside to my approach is can't replace fridge at Wal-Mart etc if needed.