Micronesia Rural Photovoltaic Panel Specifications

What is the rated output of a solar cell?

The rated output is determined with a solar cell temperature of 25°C (77°F) with an irradiance of 1000 W/m2 and in the Islands, cell temperatures when exposed to the sun are a lot always greater than the standard 25°C (77oF). Also, average irradiance is generally much less than 1000 W/m 2.

How to determine PV array size using MPPT controller?

When determining the PV array size for systems using a MPPT controller, Wh efficiency is used. All these losses are expressed as percentages which are then converted into a fraction when applied in determining the PV array output.

What is the manufacturing tolerance for a PV module?

The output of a PV module is specified in watts and with a manufacturing tolerance based on a cell temperature of 25°C(77°F). Historically this has been ±5% though in recent years typical figures have been 0% to +3% however, in small print on the data sheet there is often the statement: Measuring tolerance: ±3%.

How to determine the energy required from a PV array?

In order to determine the energy required from the PV array, it is necessary to increase the energy from the battery bank to account for all the sub-system losses. All the load energy is provided by the battery. The design month PSH is 4.38.

How much power does a PV array need?

Assume all the power is being supplied directly to the loads by the PV array, therefore no battery losses. From the example the daily energy requirement expressed in Ah from the battery is 74.1 Ah (1779Wh/24V). (Battery Inverter losses already taken into account) Number of module strings in parallel = 20.3A ÷ 8.3A = 2.45 rounded up to 3.

How does dirt affect the output of a PV module?

The output of a PV module can be reduced as a result of a build-up of dirt on the surface of the module. The actual value of this loss will be dependent on the conditions at the actual location of the modules, but in some city locations this could be high due to the amount of car pollution and dust in the air.