•Mount vertically on a non-flammable surface, with the power terminals facing downwards.
•Mount chose to the battery, but never directly above the battery (in order to prevent damage due to gassing of the battery).
•Grounding: the heatsink of the controller should be connected to the grounding point.
•The controller will operate only if the PV voltage exceeds battery voltage (Vbat).
•PV voltage must exceed Vbat +5V for the controller to start. Thereafter minimum PV voltage is Vbat +1V.
Cable connection sequence:
First: connect the battery.
Second: connect the solar array (when connected with reverse polarity, the controller will heat up but will not charge the battery).
In the other hand, MPPT solar controller is better than PWM controller. The efficiency and stability of MPPT is good than PWM type.