I was just looking at the specs on a VL45ProS. Their website shows a power consumption of "0.269kw.h/24h (laboratory data)".
I was going to order a Goal Zero Yeti 1000 core to power this in both of my trucks. This model has a pack capacity of 983Wh (10.8V, 91Ah).
Do I have this math right:
.269kwh/24hr = .01121 kwh * 1000 = 11.21 w
983wh/11.21w = 87.69 hr/24hr = 3.65 days
I know there are many variables that go into this, just want to get an idea of the math on paper of how long this would last.
That seems reasonable, and quite frankly I would trust their math over mine. I averaged 20w continuous while living out of my truck in North Carolina, so my 250wh
Jackery lasted about 12 hours. Yours is 4 times the capacity and they tested it in a more controlled environment (less lid opening events, wind and etc). My fridge was literally on the dirt/grass for a while while I ran the
Jackery tests. I would say those numbers are legit, but everyone’s mileage may vary as there are many variables like you said.
Most of the variables are in regards in the fridges surrounding environments; Arizona desert versus a garage in New Jersey is a night and day difference, to state the obvious. The other major variable is how often the fridge is opened; is someone grabbing a beer every minute, or are you taking things out for a few meals a day, with snacks/drinks occasionally?
Another variable is conversion efficiency, are you using DC to DC or using an adapter for AC power? My idle consumption with DC to DC was 1 watt, while compressor off. When I added adapter to the mix and swapped from DC to the Jackerys AC (110v) port, it averaged 7-11w idle, continuously.
Because of so many variables, what I tell people is simply the consumption when compressor is on versus when it is off.
For reference and to keep things simple, I will just reference DC numbers (and I am going from memory/it’s been a while):
When compressor is on and fully running, she used about 50watts continuous. When off she uses 1 watt.
She turns on and stays on until she’s 2-3 degrees below your set temp, then she turns off until it naturally climbs back up to 2-3 degrees above your set temp and cut back on to repeat this cycle. How much time she spends at 50watts versus 1 watt depends on how long it takes to warm up when compressor is off (extra insulation outside can help), and how long to cool down after it cuts on; Arizona desert vs New Jersey garage, lid opening events and etc.
Hope that helps!
-Sharpe