Need help determining how many watts my inverter charger should be. preppers

I have a small home off grid. The only power source I have is a DuroStar DS4000S portable generator. I wish to purchase an inverter-charger in order to be able to run appliances continuously for atleast 12 hours or more.

I think this kind of explains what we are trying to do...

What's the difference between an inverter and inverter/charger? An inverter simply converts DC (battery) power into AC power and then passes it along to connected equipment. An inverter/charger does the same thing, except that it is connected to an AC power source to continuously charge the attached batteries when AC utility power is available. In the case of a power outage, the inverter will automatically switch to battery power to provide power to connected equipment.

So the basic idea is to use the generator to recharge deep cycle batteries. This allows us to shut off the generator. Then the inverter-charger will convert the electricity for use to said appliances.

I'm not sure how many watts the inverter should be. I've done some research already, but I'd really appreciate some help making sure my calculations and my understanding on how everything should work is correct.

And my first question is how many watts does my inverter need to be?

I have a Frigidaire FRT21P5AQ9 refrigerator. Part number 240379012 on page A-5 of PDF link for anyone who wants to double check. The specs are Wattage 140 to 185, Amps (running) 1.1 to 1.6, Voltage 115 VAC (127 VAC max) that needs to be constantly running. (I have diabetes and need to keep my insulin cool).

I also have a GE JGBP35WEA7WW Gas Range. The specs are 120V; 60Hz; 5A.

I used this " "DC to AC amperage conversion run through an Inverter" calculator to help determine the amount of Watts for each device but I'm not sure if I'm using it correctly.

For the fridge I put the max volts (127v) and max amps (1.6A) and I got 203.2W. And for the stove, that'll only run when I'm cooking, I put 120V and 5A and I got 600W. So together that would be 803.2 watts I also have a number of other devices, but unfortunately I don't have the model numbers for these devices with me right now. They'll include a boom box radio, a cellular phone charger, some lights, etc. Can someone help me determine the minimum and maximum watts needed for the inverter-charger I purchase?

Actual product recommendations for inverter chargers and deep cycle batteries would also be helpful. Thanks in advance!

Submitted March 12, 2017 at 06:19AM by Xybernauts http://ift.tt/2mVaNPz preppers