Panneau solaire 10A 12V / 24V Batterie Régulateur de charge, régulateur, 3 étages PWM LCD
This is the one you want if you propose to use Li-ion batteries. Most of the cheap controllers are just designed to manage lead acid batteries. This can be set up for either...which is great if you intend to use li-ion cells or are currently on lead acid and may want to upgrade in the future. Settings for nominal 12v (3c li-ion ) system or 24v system (6c li-ion).