Example- Harbor Freight has a 45 watt kit for 199.00 US
(3*15 Watt panels - 12 volt @ about 1.5 Amps each)

includes panels, controller, 2 DC lights NOT BATTERIES

at 6 hours full light, that is 270 Watts possible, more likely 220 watts per day

I found 75 AMP hours 12 Volts for 40.00 each (military surplus, used 2 years of 10 years rated, AGM, Woo hoo!) Bought 4, so 120.00.

So, we have 300 AMP/Hours, or 3600 Watt Hours storage. (300 Amps * 12 Volt= 3600 Watts)

I have an inverter already (no extra cost) But to buy a new one capable would be ~100.00 (1000 watt continuous, 300 watt surge)

If I use 50%, or 1800 Watts, I can run my 18Ft/ Fridge (500 Watts) for 3+ hours. It would take me 8-10 days to recharge the batteries to full. Cost 320.00 ( or 420.00 with Inverter)