Te c h n i c a l D o c u m e n t a t i o n SunSaver Field Testing Procedures Abstract: The following test procedure was developed for use in field conditions, where no external power sources are available.
Note: Due to the fabrication process of the SunSaver controller, the exact damaged component may not be evident. It may only be possible to determine if the unit is functioning properly. However, other factors may be apparent the will assist the technician in determining the cause of the failure.
(step 1 cont.) B) Check the LVD FET (if controller is equipped with LVD) by measuring a diode drop between Battery (+) and Load (+) terminals. If no diode drop is present or if an open circuit is measured, the LVD FET is damaged. If no diode drop is present (short circuit), the unit will still (most likely) regulate the battry voltage properly, however the controller will no longer have LVD capability.
Step 4: PV, Battery, and Small (2A) Load Connected to Controller Note 1: A standard automotive brake lamp (type 1156) works well for this test. A) with the lamp turned On, measure the Load Voltage. It should be within 20-30 mV of the battery voltage. If the Load voltage is more than 0.25V lower than the Battery voltage, the LVD FET’s are damaged. Battery + - + PV Array Step 5: SunSaver Installed in the Power System. A) Check the correct operation of the SunSaver based on the above tests.
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