Reddit mentions of POTEK 750W Power Inverter 12V DC to 110V AC Car Adapter with Two USB and AC Charging Ports for Laptop,Tablet, Smartphone,Camera and More

This should do the trick. It's borderline so if the money isn't as much an issue I'd go for the 1000W model just to be on the safe side. Best of luck.

I just bought, and installed an exhaust fan in the back of my pickup. It works great, and I'm stoked to have power in the back now. It wasn't very difficult to figure out.

I bought this, this, this, this, and this fan. It set me back about $350, but I went with a larger, more powerful solar panel. You'll need some 10 gage wire and crimp connections. Home depot has all those parts.

Here's what it looks like.

I have an inverter with alligator clips on it that has at least 300 watts (you can gather things you think you would use and add up the watts to see your needs):
https://www.amazon.com/POTEK-Inverter-Adapter-Charging-Smartphone/dp/B01FEUD9OO/ref=sr_1_9?s=automotive&ie=UTF8&qid=1504464365&sr=1-9&refinements=p_72%3A1248861011


Then I have a marine deep cycle battery (I actually have two because I use them for other stuff also):
I can't find the exact one, but it is just Deep Cycle marine battery 12 volts and about 100 amp hours rated, they are about $75-100 at Costco or Walmart.

If you search for 24DC or the larger 27DC Marine battery you will find them.


Then of course you need a charger, I love this one, but there are others:
https://www.amazon.com/BLACK-DECKER-BC15BD-Battery-Charger/dp/B00KNMKRU8/ref=pd_bxgy_263_3?_encoding=UTF8&pd_rd_i=B00KNMKRU8&pd_rd_r=KVPBC0ZVG9ZQGWAPD6HS&pd_rd_w=4Xk7X&pd_rd_wg=SRKI5&psc=1&refRID=KVPBC0ZVG9ZQGWAPD6HS


You just clamp on the inverter and you are all set, instant power supply :)


Edit: you could also get one of these and use your car charger with it, it might extend the life of the big deep cycle battery since you don't have to run the inverter

Aux batteries are nice because you can feel confident to run them down, and when charged they allow you to jump start yourself with jumper cables if you accidentally run your car battery down.

Yes, the aux batteries need to wire into something to charge them. Either solar, grid/generator power, or the car. Mine can be charged through all 3. Charging from the car is the most practical.

You want the aux to be charged while your car is running. If you're feeling mechanical you'd want a battery isolator like this, but that install is a pain.

Instead, I use an inverter plus a charger; very safe and non-technical. I hook my inverter up to my starter battery, and simply wedge it next to the starter battery under the hood. Then I run a normal "3-prong" home extension cord from under the hood into my SUV cab. In the cab I plug into a battery charger which is connected to the aux batteries to charge them. These links aren't the actual ones I use, just to show you examples.

In my setup, I have to pop the hood and switch on the inverter after I start the car, and before I stop the car, pop the hood again and turn it off. So it doesn't drain the stater battery while the car is off. Some people might agree with my build but in my opinion it's the simplest and cheapest way.

As far as sizing. For simple, just get one battery. Look at the Amp Hours (Ah) rating. IMO get an AGM battery (a type of SLA), other types are finicky. Watts is Amps Volts. Batteries are 12 volts so a 12 volt battery with 100 Amp Hours (Ah) can provide 12100=1200 watts. Divide by 2 since you only want to drain it to 50%. So a 100 Ah battery gives you 600 watts. If you run a 25 watt blanket, that means the battery can run it for 24 hours. It's best to underestimate here since the battery will rarely be fully charged except after a long drive.

If you had a 100 Ah AGM battery, you'd want probably a 10-amp charger (for reasons) and a 400+ watt inverter.

I know it's a lot :p Hope it makes sense.