Solar Expedition 450W Solar Array
July 2021
|
Solar Stik
®
Inc.
22
|
1. The Expedition panel should be in its folded/storage
position and in darkness to ensure correct readings.
2. Set the multimeter to Diode Mode ( symbol).
3. Insert the test leads of the multimeter into the HC-4
connectors of the Expedition panel. Look into the
end of the connector as you are inserting the leads
to ensure that they make a solid contact with the
conductive part of the connector.
4. Take measurements with the multimeter leads in both
orientations. The choice of which lead goes into which
connector first is not important because a complete
analysis will include measurements made with the leads
in both orientations.
Postive (+)
Negative (-)
The images below show the readings expected when the bypass diode is functioning properly.
Test results for a good bypass diode:
• The multimeter displays OL when a good diode is reverse-biased. The OL reading indicates the
diode is functioning as an open switch.
• A good forward-biased diode displays a value of < 0.2 V.
Test results for a faulty bypass diode:
• A bad (opened) diode does not allow current to flow in either direction.
• A multimeter will display OL in both directions when the diode is opened.
The Expedition bypass diodes permit forward flow of current produced by the solar cells that
comprise the Expedition. They also prevent current from flowing in reverse, which will result in heat
buildup that will damage the cells and potentially result in a fire. Follow the steps below to verify
that the bypass diodes are installed in the proper orientation and are functioning properly.
Expedition Bypass Diode Test
Figure 24. Bypass diode reverse-biased measurement Figure 25. Bypass diode forward-biased measurement
Figure 26. HC-4 connectors from a Expedition
panel
