Sizing MPPT Charge Controllers

How to Size a Solar Charge Controllers

Outback Power's MX60, an MPPT Charge Controller

Sizing MPT 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 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 Sizing Tools from the Manufacturers

• Xantrex Sizing Tools
• Outback Power Sizing Tools
• Morningstar Sizing Tools
• Blue Sky Energy Sizing Tools