40A LED MPPT Controller
40A MPPT Charge Controller With LCD, 150V Max Panel Voltage
The Microcare MPPT utilizes PWM and integrated technology to provide greater than 96% efficiency from your solar panels. What you can be sure of is that the Microcare MPPT charge controller will deliver the highest charge current possible for a given set of operating conditions. The ability to step down a high voltage solar array to a low voltage battery can save you money by reducing the size of the wire required and making the installation simpler and faster.
Operator Friendly Features & Controls Include:
- Automatic selection of Battery voltage (12v-48v)
- Automatic selection of Panel voltage (20voc-150voc)
- Circuit Breaker protection – Full input and output protection
- Battery and Panel Voltage Display
- Charge Mode and Current Display (Equalize, Boost and Float.)
- Output Power from Panels Display
- 24hr Average, 8 Day Data Logge
What is maximum power point tracking (MPPT) and how does it work?
Maximum Power Point Tracking, frequently referred to as MPPT, is an electronic system that operates the Photovoltaic (PV) modules in a manner that allows the modules to produce all the power they are capable of. MPPT is not a mechanical tracking system that “physically moves” the modules to make them point more directly at the sun. MPPT is a fully electronic system that varies the electrical operating point of the modules so that the modules are able to deliver maximum available power. Additional power harvested from the modules is then made available as increased battery charge current. MPPT can be used in conjunction with a mechanical tracking system, but the two systems are completely different.
To understand how MPPT works, let’s first consider the operation of a conventional (non-MPPT) charge controller. When a conventional controller is charging a discharged battery, it simply connects the modules directly to the battery. This forces the modules to operate at battery voltage, typically not the ideal operating voltage at which the modules are able to produce their maximum available power.
For the example, the conventional controller simply connects the module to the battery and therefore forces the module to operate at 12V. For example, by forcing the 75W module to operate at 12V the conventional controller artificially limits power production to approx. 53W.
Rather than simply connecting the module to the battery, the MPPT charge controller calculates the voltage at which the module is able to produce maximum power. In the example of 75w panel and the maximum power voltage of the module (VMP) is 17V. The MPPT system then operates the modules at 17V to extract the full 75W, regardless of present battery voltage. A high efficiency DC-to-DC power converter converts the 17V module voltage at the controller input to battery voltage at the output. If the whole system wiring and all was 100% efficient, battery charge current of 42% would be achieved by harvesting module power that would have been left behind by a conventional controller and turning it into useable charge current.
Sample 300W MPPT system:
