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Commissioning
The starting and operation of a PV system for the first time

Delamination
The seperation of the bonded layers of glass and/or plastic encasing the PV cells of a module

Hydrometer
An instrument used to measure the specific gravity of a liquid

Battery Load Tester
A test instrument that indicates battery health by drawing a high discharge current from a battery for a short period

Maintenance Plan
A checklist of all required regular maintenance tasks and their recommended intervals

Monitoring
The repeated measurement of electrical, environmental, or battery parameters at certain intervals

Data Acquisition
The recording and processing of data from a monitoring system

Troubleshooting
A systematic method of investigating the cause of system problems and determining the best solution

Troubleshooting Level
The depth of examination into the equipment or processes that compose a system

Incentive
A monetary inducement to invest in a certain type of capital improvement, such as an every generating system or energyconservation measure

Production Incentive
A recurring payment program that provides project owners with cash payments based on electricity production

Energy cost
An expense related to the energy input of an electricitygenerating system

Discount Rate
The rate at which the value of furture money is reduced to its present value

Single Present Value Factor
A multiplication factor for determining the present value of a single future cost for a given discount rate and period

Recurring Present Value Factor
A multiplication factor for determining the present value of an annually recurring cost for a given discount rate

Annualized Cost
A portion of the total lifecycle cost attributed equally to each year of operation

Payback Period
The amount of time required for the avoided costs from an alternate energy source to match the cost of the chosen energyproduction system

Payback Point
The point at which the accumulated lifecycle cost of one system option matches the total lifecycle cost of the other system option

Energy Payback
The amount of time a PV system must operate to produce enough energy to offset the energy required to manufacture the PV system

