Renewable Energy Glossary

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Magnetic Declination

Measure of the difference between true north or south (in degrees to the east or west) and magnetic north or south at a particular site.

Manifold

A system of piping with a single inlet and multiple outlets or multiple inlets and a single outlet.

Maximum Power

The power in watts produced by the turbine at maximum water flow and net head. This number (with suitable safety factors) is used to calculate the size of transmission wiring, controllers, and dump loads for the system.

Maximum Power Point

The point on the I-V curve where a module will produce the most power at STC ratings. The MPP is the product of the maximum power current (Imp, Imax) and the maximum power voltage (Vmp, Vmax); these values can only be measured when the system is under load.

Maximum Power Point Tracking

Maximum power point tracking (MPPT) is a feature of power equipment that enables it to follow the ever-changing maximum power point of a PV array throughout the day in order to deliver the most power possible. In microhydro systems, MPPT is used to optimize turbine speed by changing the load characteristics with changes in voltage. This technology applies to turbines that drive permanent magnet alternators (whose magnetic field cannot be controlled).

Mean Radiant Temperature

The average temperature of all surrounding surfaces in a space. It is used to measure the comfort level of a room.

Mechanical Ventilation

A system that uses mechanical devices such as fans, blowers, air-distribution ductwork, a heat-recovery ventilator, or an energy recovery ventilator to blow old air out, suck in new air in, or do both.

Micro-hydro

Micro-hydro technology uses falling water to generate electricity through a turbine, on a much smaller scale than conventional hydroelectric technology.

Microhydro

Technical definitions vary, but in common usage for home-scale systems, microhydro refers to hydro-electric plants producing from about 50 watts to perhaps 10,000 watts. Many prefer the terms "nano" or "pico hydro" for this size range.

Microinverter

A low-wattage inverter designed to produce AC electricity from one PV module.

Mineral Wool Insulation

Also referred to as rock or slag wool, mineral wool insulation is made from an industrial waste product from steel production and basalt. Resembling fiberglass, it is said to perform better in terms of fire resistance.

Mixing Valve

A less-expensive anti-scald valve that will not normally be acceptable as an equal replacement due to less accuracy.

Monocrystalline

PV cells manufactured from a single crystal with perfect silicon lattice structure, making them among the most efficient commercially available cell technologies.

MPP

Maximum power point (MPP, Pmp, or Pmax) is the point on the I-V curve where a module will produce the most power at STC ratings. The MPP is the product of the maximum power current (Imp, Imax) and the maximum power voltage (Vmp, Vmax); these values can only be measured when the system is under load.

MPPT

Maximum power point tracking (MPPT) is a feature of power equipment that enables it to follow the ever-changing maximum power point of the PV array throughout the day in order to deliver the most power possible. In microhydro systems, MPPT is used to optimize turbine speed by changing the load characteristics with changes in voltage. This technology applies to turbines that drive permanent magnet alternators (whose magnetic field cannot be controlled).

MRT

Mean radiant temperature (MRT) is the average temperature of all surrounding surfaces in a space. It is used to measure the comfort level of a room.

Multi-crystalline

PV cells made by a casting silicon in a mold; also known as polycrystalline. Once solidified, it creates many crystals within the ingot.

1 A B C D E F G H I J K L M N O P Q R S T U V W Y

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