The batteries is 12V 80AH, sorry I forgot to point this out.
The story behind:
- A customer had a contract to install 100 outdoor billboard where the electricity is unavailable for 2 years.
- The back light will be LED based, powered by 12V 80AH automotive (truck) battery.
- He's calculation that he need to replace and charge the batteries once a week.
- He is asking me to build the LED back lighting system and finding the solution for battery charging.
But I still not getting the deal for this
The batteries do not need to be charged all for once a week, it can be scheduled daily (about 15/day), so it should not be so hard. As the contract is for 2 years then the charging method need to be good enough to give them the proper life time.
No problem with the back lighting, still looking for the best solution on charging, and the most important - still waiting for the deal...