If your solar panel system does not include batteries ... you should not use a 40-amp charge controller. Many charge controllers include an LCD display where you can check operating parameters ...

However, the secret weapon behind maximizing the efficiency of these panels often goes unnoticed: the MPPT solar charge controller. At the intersection of technology and sustainability ...

Solar power ... happened upon a 450W PV panel on the cheap. Sadly, the panel was a commercial unit, and compatible off-the-shelf MPPT, or maximum power-point tracking, controllers are expensive.