HarryN
Flashlight Enthusiast
How much run time do you get from the power station with your fridge plugged in?
There are two loads on a power station running a refrigerator:
- The standby power of the inverter portion just being turned on
- The refrigerator or load itself
There is a Department of energy sticker inside of the fridge for a 1 year / 365 day average, and most of them are in the 1 - 2 kW-hrs range per day. This includes the automatic defrost cycle. So depending if the fridge is making ice, defrosting, or just running, it might only use 1 kW-hr that day, especially if you keep the door shut a bit more those days.
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The standby power draw of inverters varies by model, but it is commonly in the 20 - 40 watts range, and this adds up. Using 25 watts for run:
( 25 watts ) x ( 24 hrs / day ) ~ 600 watt-hrs , so it can be 30 -40 % or more of the power used from the battery pack.
My inverter pulls 20 watts but I have seen some pull 80 watts standby power.
The standby power used is a constant, so you can run multiple loads on it and that part does not change.
The inverter that I use ( and many of them ) has a TTL terminal point to turn on / off the inverter with an external switch. I am thinking about adding a timer so that the inverter is off 50% of the time to save some power, but have not done it yet.
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So my 4 kw-hr system can run it for a few days and the 2 kW-hr system obviously less. So far we have been lucky and I have never had to run more than 1 day.
When I had my van, it had 2 each x 150 watt solar panels on it, so nominal 300 watts. I also have another 4 of those in the garage that I can put in the driveway to supplement during outages.
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So when I have that much solar out there, it keeps up on a sunny day. On cloudy days, more or less not much solar is collected.
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The main challenge with the commercial power stations is that one of the on-line influencers pushed them all to go with larger inverters and small batter packs, which is kind of the opposite of what is needed in a power the refrigerator in an outage situation. You would really like to have 2 days of stored power if possible to carry it over for a 3 day outage.
A bit of a complicated response but I hope that makes sense.
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