Troubleshooting
If the LED Indicator will not light, or displays an indication not listed in this manual:
• Verify correct battery polarity;
• Check that there is a solid electrical connection to the battery;
• Check that battery voltage appears on the GVB-8 battery cables.
The GVB-8-WP will not operate without a battery. If the system appears to be overcharging or the GVB-8-WP will not begin charging, ensure that the solar panel is wired only to the GVB-8-WP.
If the GVB-8-WP does not appear to be charging, note that the GVB-8-WP waits up to one minute before trying to restart if is has shut down due to lack of power from the solar panel. If the
LED indicator will not light with a battery connected, or blinks the over-battery-voltage error, or the controller does not charge, the fuse may be blown. The GVB-8-WP fuse is located in a
black waterproof in-line fuse holder in the positive battery line. If the fuse is blown, replace it with a 10A fast-acting ATO or ATC fuse rated for the maximum battery voltage. Automotive-style
fuses are typically rated to 32V, and are suitable for the GVB-8-Pb-12V-WP, GVB-8-Pb-24V-WP, GVB-8-Li-14.2V-WP, and GVB-8-Li-28.4V-WP. For the GVB-8-Pb-36V-WP, GVB-8-Pb-48V-WP, GVB-
8-Li-41.7V-WP, GVB-8-Li-54.2V-WP, and GVB-8-Li-56.8V-WP, a fuse with a higher voltage rating is required. We recommend Littelfuse part number 142.6185.5102, rated 58V, or OPRIFUSE part
number APR58-UL-10A (UL# is JFHR2-E504903), rated 58V. For more in-depth system troubleshooting, please visit the support area of our website: https://sunforgellc.com/learning-center.
Specifications:
Rated Panel (Input) Current:
8A*
Minimum Panel Voltage for Charging:
5V
Minimum Battery Voltage for Operation:
9.5V
Maximum Input Panel:
60V
Recommended Max Panel Voc at STC:
50V
Input Voltage Range:
0-60V
Maximum Input Short Circuit Current**:
8A*
Maximum Input Current***:
15A
Operating Temperature:
-40°C – 85°C
Maximum Full Power Ambient:
70°C
MPPT Tracking Speed:
15Hz
Environmental Protection:
IP68, Waterproof
Connection:
Flying Leads, 16 AWG tinned wire, pre-stripped
Certifications:
CE, FCC, RoHS
GVB-8-WP, All Models
Note:
The most common causes of blown fuses are:
• Connecting the GVB-8-WP to the battery backwards;
• Shorting the solar panel input while the GVB-8-WP is charging. In this case,
there may be internal damage to the controller.
*Panel ratings have increased since we designed the GVB. Although we don't believe in changing specifications without a corresponding engineering change, based on both our customers' experiences over the years as well as the
headroom we designed into the GVB, we feel comfortable recommending the GVB for panels with Imp up to 9A. **Panel Isc. Maximum input power and maximum input voltage requirements must also be respected. ***Maximum
current that the controller could draw from an unlimited source. This specification is not intended for determining PV input.
