Sizing MPPT Charge Controllers

How to Size a Solar Charge Controllers

Outback Power's MX60, an MPPT Charge Controller

Sizing MPPT solar charge controllers by hand can be one of the more difficult takes for a system designer. Unlike PWM or shunt controllers, many MPPT controllers have the ability to down convert higher voltage PV (solar panel) arrays to lower voltage battery banks. In order to do the calculations, a few different NEC (national electric code) factors are required. To explain this process is beyond the scope of this article, but we can give a couple of web links to get you close. If you are unsure of the correct controller for you, contact a solar professional to help. Here are some links to manufacturers’ websites that include sizing tools for their controllers.

MPPT Solar Charge Controller Sizing Tools from the Manufacturers

• Morningstar Sizing Tools
• Blue Sky Energy Sizing Tools