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So I picked up this HF 350 Power Station looking for a solution to power our mini fridge in our outdoor kitchen. It works great! Powered the fridge for our 8 hour trip and still had some charge left. Our inside fridge is DC so it runs the whole time but I keep the fridge in the outside kitchen full of...... sodas....... and I hated that when we would get to our destination my ......sodas..... would be warm. I would say it would have went 9 hours which is pretty awesome IMO.
Thos big battery invertors are pretty neat. Back when I had a trailer with an oudoor fridge that was 120vAC only, and I was camping off-grid, I found that as long as the fridge and BEvERages were cold to start, they'd stay pretty cool for the weekend, as long as I swapped in some ice packs every morning, whch I re-froze every night in the inside fridge, which ran off propane.
Also agree that a decent cooler with ice in it works good too. Nice to have options. Where you really get in trouble is if you have a few dozen "spare" drinks and they get warm, and your main fridge is full of food for the family.
I like it. Sure ice works too, but ice is a pain in the azz, takes up space in the fridge, and isn't always available when/ where you want it. The little inverter power supply battery thing can be reused and it has other uses outside the camper if needed.
My camper's outside kitchen fridge is also AC powered, but I have a couple LiFeP04 batteries and an inverter installed in the camper, so I keep the beer cold with the same principle, just not as portable.
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I think those would be pretty handy. Not necessarily for a beer fridge, but just anything around a camper. Paired with the HF Predator portable solar array, and you've got a way to power all the gadgets the family wants to run each evening, then charge the next day.