For a heater, it will get high dollar in a hurry. One of our guys had a 45 watt from Harbor Freight, he ran lights, fan, radio headset and charged his cell phone. They no longer make that one.

I have a 8'x8' 12' hihg cedar deerstand and have solar power to it. I was unhappy with the function of it last year and need to know exactly what size of charger/inverter/another solar panel?/battery size/ etc to run my stand 24/7. I will start by telling what I have currently, and what I will be using. I have a BP 120 watt solar pannel. A small charger, a 400 watt pricy inverter. In the deer stand I have a 30 inch flat screen tv/dvd combo, two 100 watt lights, used only after dark to help get out of the stand, a AC/Heater under the stand with 4" inlet and 4" return air, 750 watt microwave, small ice box, 1.2 amps, cycles off and on, off more than on in winter, dish network reciever & Sat. system, less than 10 watts???? The tv uses around 100 watts, in AC mode uses just under 6 amps, heat strip 8 amps. this system designed for dog house comfort. I live in Northern Louisiana, and use the AC during the first of the
season, and heat latter in the season. Last year I was running behind started with a 20 watt solar panel, 3 cranking/deep cycle optma blue top batteries, ordered deepcycle, they sent the cranking/deep cycle compo. I hooked then in series, for a total output of 12 volts. I saw real soon the 20 watt panel was too small, as the bat. ran down after only a couple of hours. That is when I bought the 120 watt panel, could not get it on top of the stand last year, and used small ga wire to run from the ground to the charger 12 feet up, but the wire was over 20' long. I now have the 120 watt panel on top of the stand, and the largest ga. wire that would fit. I think this will help. I only hunt 3 days in a row. Fri.Sat.Sun. for about 4 hours at a time. I want to leave the icebox on 24/7. The heat/AC, TV, occasional use of the microwave for not more than 5 minutes a hunt, the AC/heat will only beused around 2 hours max for the 3 days I hunt, Tv will be in use for about 3 hours a hunt x 3 hunts a week. I know that by leaving the inverter on 24/7 it will have a neg draw, around .5 to .6 amps I would guess.

My question is what do I need to add, upgrade, to do the above. What kind of battery, charger, and inverter do I need to accomplash this?
Do I need a bigger solar panel? or will the 120 watt be big enough? What ever you think I need to get to accomplish this I need to know. I know it sound crazy, but I love to hunt in style, but last year only the tv, and icebox could be ran for about 3 hours, and the batteries would be discharged. If you need more information, just let me know. I am serious about getting the system right, so I can leave the icebox on, and not have my food spoil. Is this doable?

It rarely gets below 40 degrees,,, bring a down jacket.

The heater was just an "if" lol
I'm more focused on the fan and phone charger. Thanks for the info, guys!

A $300 300-watt solar panel will generate approx 1000 btu per hour in full sunlight (ZERO when it's dark).
By comparison, a $2 bottle (1#) of propane = 20,000 btus !! (w/ a $20 heater)
$15 of propane (20# bbq bottle) = 400,000 btus ( equivalent to $120,000 worth of 'solar panels' )

A $300 300-watt solar panel will generate approx 1000 btu per hour in full sunlight (ZERO when it's dark).
By comparison, a $2 bottle (1#) of propane = 20,000 btus !! (w/ a $20 heater)
$15 of propane (20# bbq bottle) = 400,000 btus ( equivalent to $120,000 worth of 'solar panels' )

I use the Mr Heater Little Buddy and bring one of the portable phone charger battery banks. Just charge it before you leave the house or trailer. You can buy a 2 pack and will give you between 6 -8 hours if you are constantly on your phone.

I believe you’re off in your calculation.

1 pound of propane is 90,000 btus. Therefore a 20# bottle is 1,800,000btus.

a GALLON of propane = 90k btus; a gallon is about 4.5 pounds . . .

(like my physics prof always said, check your UNITS!; the 'numbers' are worthless if the units are wrong!)

Well that’s not good. We just had our house built and the propane guy did his calculations and decided that for 3300sq ft with spray foam insulation, gas tankless water heater, 2 gas furnaces, and 2 gas start fireplaces that all we needed was a 250lb tank. In all his calculations he listed 1lb = 90,000btu

Propane is the most expensive energy source for a house
I've pulled out my furnace and replaced with 16 seer heat-pump,
and pulled out propane WHeater and replaced with electric HeatPump WH.
bills are less than HALF what the propane was costing.