Victron's Blue series of MPPT charge controllers are some of the most simple and reliable on the market. Theyre also cheap.
This unit will take up to 100V DC which allows for 2 standard grid tie panels in series. This allows us to connect between 500-640W which will be ample charge for even the most demanding 12V applications.
The unit will also happily work off a single solar panel giving a range of 250-320W.
This device applies a 4 step adaptive charging methodology, thereby ensuring long battery life. It will also deliver 12V out and will disconnect all loads to protect your cells.