vanlifer here. this runs my 12v fridge on eco mode aiming for 30 degrees (F) while my car is in 100 degree heat in the shade (car vented and fan going of course) for multiple days. If I have to plug something in that is a regular wall outlet it will do hours but not days. It will not charge from the car like my smaller ones will, but seeing what the input from the wall or solar panel is compared to what the input from any source is on the smaller jackeries, that's probably a good thing and meant to protect the car batteries. Also, please note that if you have smaller jackeries there are at least two sizes of solar panel inputs and there are adapters on these but i have mixed feelings about the adapters so i use one solar panel for my smaller ones and the one that comes with this package on my bigger one. also, it is heavy. I keep one of those rolling office carts folded up in my car for when I need to transport the battery anywhere. probably my one complaint is the solar panels - there's a few things that weren't thought through very well. one, when they are folded, the outside is the solar panel - that's probably meant so you can still halfway use it while its folded but i'm never going to use it while its folded and it makes it so much harder to unfold, especially since it is very heavy and fragile. and then the other thing is that it is fragile enough that I keep it in the original box for it's protection but that means I have a box in my car and I've had to go out of my way to disguise it so it doesn't look like something worth breaking into a car for. It would be nice if there was a carrying case or something, or if it wasn't so fragile that I needed to put it in something like that. these are not complaints that lower my rating in any significant way though, and it is still an extremely affordable and usable item for what i need.