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For Leaves Limited, founded in 2012, specialized in production of PV module. Now mostly focuses on the customized solar panel, like semi flexible, ETFE panel and other special type & materials solar panel. Meanwhile, offer the complete solution of dc charging system.

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Charge Controller - Photovoltaic System Component
Source: Solar Direct | Author:For Leaves Ltd | Publish time: 2015-08-02 | 1955 Views | Share:

Some controllers have these voltage points factory-preset and non adjustable, other controllers can be adjustable.

Controllers are rated by how much amperage they can handle. National Electric Code regulations require controllers to be capable of withstanding 25% over amperage for a limited time. This allows your controller to survive the occasional edge-of-cloud effect, when sunlight increases dramatically.  Exceeding the amperage ratings on your controller can destroy it.

Using a controller with more amperage capacity than you are generating will allow you for future expansion and it usually doesn't cost much.

A PV controller also prevents reverse current flow at night. Reverse current flow is the tiny amount of electricity that can flow backwards through PV modules at night, discharging the battery, but the loss of power is insignificant.  Only with larger PV systems is this significant but and almost all charge controllers deal with it automatically.