Check SP-Series Solar Pack Voltage

In the event of insufficient or unstable battery voltage from an SP-series solar power pack, the output voltage can be measured directly on the UW-6 plug. The pack can be tested both in and out of direct sunlight in order to assess the functionality of the solar panel.

Use a DC Multimeter and measure the potential between Pins 1 (V+) and 3 (GND) of the pack’s UW-6 plug connector.

UW-6 plug pin connections.


Healthy operational pack voltages range from 12V to approximately 15.1V, depending on the amount of direct sunlight and the age/health of the installed battery.

Significantly lower observed voltages may warrant a battery replacement (every 3-5 years standard) or solar regulator replacement (only in event of failure).