Determination of AINV:When calculating the availability of the plant, the availability of each inverter / converter shall be weightedwith the nominal DC power input of the modules installed at each inverter / converter. An inverter / convertershall be deemed to be unavailable when its capacity is generating less than its nominal capacity.Determination of HPER:“Hours of the Period” are the total hours of each relevant period, reduced by the hours:•When solar irradiance measured in the module plane of array is below 50 W/m²•When such inverter / converter is not operative due to Force Majeure•When such inverter / converter is not operative due to a cause solely attributable to the Employer•When such inverter / converter is not operative due to grid outage.Determination of HUNA:The “Hours of Unavailability” are those hours of each relevant period when the applicable inverter /converter is not operative for reasons other than those described for purposes of calculating the “Hoursof the Period” HPER.Notes:The time period of measurement will be the minimum available, this must be shorter than 2 minutes.If the Availability is less than Guaranteed Availability in any year, Availability Liquidated Damages shallbe paid.Availability Liquidated Damages shall be calculated as follows: