Victron is exactly what you need! I was looking for a cheaper controller but am now very glad I ordered the Victron 48V. The bluetooth app was easy to install and gives a lot of information. This was perfect for powering my solar panels to run a 48v motor. Please note that you need at least three 100w solar panels to run the controller (input voltage must be 5v above battery voltage) - total power for 3 modules is over 60v and will charge my lithium battery very well.