Open Circuit Voltage Test Purpose Sample Clauses

Open Circuit Voltage Test Purpose. Open Circuit Voltage Testing provides a simple method to determine that all strings are properly connected (module and string polarity) and that all PV modules are producing an appropriate voltage level. Scope: All strings Party: Seller Equipment/ Materials: • rubber insulating gloves • voltmeter with an accuracy of at least 1 percent of reading • fuse puller • infrared thermometer or thermocouple • PV specification for Voc as a function of temperature • jumper wire Conditions: This test should be conducted under full sun (>500 X-x-2) and stable sky conditions, generally between the hours of 10:00am and 2:00pm. Procedure: o Measure the temperature of the PV modules using an infrared thermometer or thermocouple. (It is sufficient to measure the temperature of 2-3 modules and take the average). o Calculate Expected Voc: Referring to the PV manufacturer supplied equation for Voc as a function of temperature, calculate the expected Voc of each string. o Remove Fuses: Wearing rubber insulating gloves and using a fuse puller, carefully remove the fuses from the combiner box. Failure to remove the fuses will result in identical voltage measurements for every string since they are in parallel with the fuses in place. o Test String Voltages: Place the positive lead on the fuse block of the string you are testing while the negative lead is attached to the negative block. Continue testing each string by moving to each positive string fuse block. Test and record the voltage of each electrical string. Criteria: For stable sky conditions and irradiance above 500 X-x-2, string voltages should conform to within 5% of expected voltage as calculated in Step 2 above and each string should conform to within 2% of the average string voltage in the same combiner box under identical temperature and irradiance conditions. For irradiance less than 500 X-x-2 or for unstable sky conditions (if irradiance changes by more than 10%, or ambient temperature changes by more than 5°C), compare each string’s measured voltage to periodic measurements on a known good (reference) string. The reference string must be measured at irradiance above 500 X-x-2 and its measured voltage must be within 5% of the voltage calculated using Step 2 above. Voltage on non-reference strings should be within 5% of the reference string voltage under the same temperature and irradiance conditions. For irradiance less than 200 X-x-2, test results may be used only to confirm proper string connection, and not to eva...
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