HT SOLAR I-Ww User Manual (English)

Questions and Answers:

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Jennifer GreerAug 10, 2025
Why is the short circuit current high on my HT SOLAR I-Ww Measuring Instruments?
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  christinareyesAug 10, 2025
  A high short circuit current in HT Measuring Instruments can occur if the irradiance sensor is not correctly oriented. Ensure it is properly oriented. Another cause might be shades or dirt on the irradiance sensor; in this case, clean the irradiance sensor or remove any obstruction. Also, verify that the module selection is correct in the PV system configuration and set the instrument properly. If the sensor is defective, replace it.
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sschultzAug 15, 2025
What to do if the short circuit current is low on HT SOLAR I-Ww?
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  Mackenzie AdamsAug 15, 2025
  Low short circuit current in HT Measuring Instruments can be caused by several factors. Ensure the irradiance sensor is correctly oriented. Reflections on the sensor can also cause this issue, so set the instrument properly. Check for environmental contaminants on the modules, such as soiling, dirt, snow, or debris, and clean the modules or remove any obstructions. Far distance obstructions (shading) may also be the cause, or aging; check the modules for blindness or humidity and replace affected modules if necessary. Also, ensure that the module selection is correct in the PV system configuration.
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jessica24Aug 20, 2025
Why is the open circuit voltage low on my HT SOLAR I-Ww?
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  Stephanie AndersonAug 20, 2025
  A low open circuit voltage in HT Measuring Instruments may be due to a low temperature measurement; attach the thermocouple properly to a typical temperature location. It can also result from an incorrect number of module selections in the PV system configuration; in this case, select the AUTO mode. Shorted bypass diodes could also be the cause; set the instrument properly. In some cases, replacing affected modules is also a solution.
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Carrie DiazAug 26, 2025
How to fix a non-linear characteristic curve on HT SOLAR I-Ww Measuring Instruments?
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  dennis41Aug 26, 2025
  A characteristic curve that is not linear in HT Measuring Instruments may be due to unsteady irradiation during measurement; re-test when clouds are gone. Leopard spot clouds shading the modules can also cause this; repeat measurement at an irradiation of minimum 700W/m2 (IEC/EN61829). Also, low irradiation during measurement can be the reason.
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Kristi AllenAug 30, 2025
What causes a low current ratio Impp/Isc in HT Measuring Instruments?
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  Blake FloresAug 31, 2025
  A low current ratio Impp/Isc in HT Measuring Instruments can occur due to soiling across modules; clean the modules. Tapered shades can also cause this; un-shade the modules. A small current mismatch may be the reason; check the current match. Degradation of cell shunt resistance can also be a factor; replace affected modules.
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Kristi VazquezSep 4, 2025
What to do if the voltage ratio Vmpp/Voc is low on HT SOLAR I-Ww Measuring Instruments?
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  Jennifer MosesSep 4, 2025
  A low voltage ratio Vmpp/Voc in HT Measuring Instruments can be caused by a voltage drop on cables to the PV module string; check cables, connectors, contacts, and string wirings. Also, check cable length and cross section. Check modules for bad connections or oxidation. Replacing affected modules might also be necessary.