Translations:Weather and solar resource evaluation/22/en

For the purpose of PV system design, the solar resource for a given location is expressed as insolation in kWh/m². The insolation value for a location will vary each day throughout the year. For the purpose of sizing the PV source for an off-grid PV system the most relevant value is the monthly average insolation value for a location as compared to the monthly average energy requirement - this process is covered in the load and solar resource comparison. This value will be used to size the PV source to ensure that system can generate enough energy to meet the demands for all loads and to recharge the battery bank during periods of poor weather. It is very important to use a conservative insolation value for PV array sizing calculations.