Originally Posted by SKMT
I'm planning to buy a cheap
domestic 120v chest freezer
in either 5 or 7 cu ft.
1)Does anybody have experience running one of these off a 1000w inverter -- is it enough for compressor startup?
Depends on the inverter, the ambient temperature, the temperature inside the freezer. You may find that a freezer that runs OK if previously cooled off on shore power
won't start if it has been defrosted, particularly on a hot day, so the fact that it works once is no guarantee it will work
next time. I think 1000 watts would be marginal.
Keep in mind that you'll have to defrost several times a year in tropical areas, more often if you are opening the freezer multiple times a day e.g. to get ice
2)Also, curious to estimated daily amp draw in florida type heat?
amp hour draw per day at 12v with 10% inverter losses = kwh draw per year divided by 4
Typically these draw around 200-250 kwh per year on the yellow label which matches my own measurements on the ones I have owned, so you're looking at 50-60 Ah per day, roughly. On a hot day it will be a little more but will not be double.
3) For 5 vs 7 cu ft, do you think they actually step up the compressor size, or use exact same compressor in both?
Comparing the Energy Star yearly KWH, they say the 7 uses about 17% more energy (for 30% more space). Not sure if that's due to larger compressor, or same size compressor running more...
The KWH used is roughly proportional to the total wall area (on all six sides) because that determines the heat loss. Did they change compressors between models? Who knows, but it doesn't affect energy use as long as it's reasonably sized for the wall area.