This shouldn't be too hard....
First off you need to calculate how much power you need for how long. I would recommend buying 12 Volt LEDs for all your lighting needs. They are pretty easy to locate on Amazon and I am sure other places as well. They have strip lights, flood lights, etc that could easily be used to light inside and around a connex.
So determine your total load...
For example....
(2) 12 Volt LEDs @ 18 Watts (18 x 2) = 36
(2) 12 Volt LEDs floods @ 36 watt (36 x 2) = 72
(5) smart phones @ 5 watts (5 x 5) = 25
133 Watts @ 12 volts
Then go here....
https://www.batterystuff.com/kb/tools/solar-calculator.htmlAnd enter you information on your wattage, voltage, hours per day running, how many days of backup power you want (without charging), & approx size of your battery in Amp-hours
Then you can size your solar panel...
Hour of sun per day (assume around 6 for Texas, but you can find a chart online - this is DIRECT sunlight)
https://www.wholesalesolar.com/solar-information/sun-hours-us-mapSolar Panel Sizing ( I would recommend at least 100 watt panel minimum)
So for my example, here is what I entered....
wattage = 133
hours = 4
voltage = 12
days of backup power = 2 days (without charging)
Approx size of your battery in Amp-hours = 125 ah
Hrs of Sun = 6
Solar Panel = 100 Watts
This yields ONE 12 volt 125 AH battery and TWO 100 Watt, 12 Volt Solar Panel
So now for a parts list....
125 Ah Battery - $240 on Amazon
100 Watt Solar Panel = $100 on Amazon X 2
Charge Controller - Morningstar SS-20L-12V Sunsaver-20 Amp With Lvd $100
There are $30 (or cheaper) charge controllers on Amazon and Ebay, but the Morningstar is a very good brand where they others are cheap Chinese controllers that may or may not last. Also, the unit I listed above has a low voltage disconnect which will drop the load once the battery hits 50% of rated output.
This will prevent you from damaging the batteries if you forget to turn a switch off. The unit would just kill the output.
You may need a bigger panel or more batteries (and maybe even a large charge controller) depending on how many lights you want to run and how long you run them, that is why I linked the calculator to help you size the battery and solar panel.
Choose your lights and post them and your estimated run times and I can help you size your equipment if you like.
You can also buy several smaller Ah batteries and wire in parallel if you found a good deal on 35 or 50 ah batteries as well.
aggiez