Check SP-Series Solar Pack Voltage

In the event of insufficient or unstable battery voltage from an SP-series solar power pack, check the output voltage by measuring directly on the UW-6 plug. Test the pack both in and out of direct sunlight to fully assess the functionality of the solar panel.

Use a DC voltmeter or multimeter set to measure at least 20VDC. Measure the potential between Pins 1 (V+) and 3 (GND) of the pack’s UW-6 plug connector.

SP-Series solar power pack voltage

Figure 1: UW-6 plug pin connections.


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

Significantly lower observed voltage on the SP-Series solar power pack may warrant service. Normal service consists of a battery replacement (every 3-5 years standard) and/or solar regulator replacement (only in event of failure).