Hi...On the off chance that your current ice chest works OK right now, I'd be enticed to go through some cash on 2 or 3 additional batteries and a sun oriented board. Additional batteries will give you broadened perseverance for the ice chest, and a greater bank can retain charge all the more rapidly, amplifying charge proficiency. I'd likewise see whether it's conceivable to add more protection to the current ice chest.
https://www.7pcb.com/
https://www.7pcb.com/