Troubleshooting‎ > ‎

Solar Panel

Symptom:
My solar panel is not charging.

Solution:
By attaching a multi-meter directly to the power lugs (screws) on the rear of the solar panel (while it is
exposed to direct sunlight), you can make absolutely sure the problem lies in the solar panel itself.
Connecting multi-meter directly to Solar panel

This method eliminates all the other components involved in solar recharging; including the Kelly
controller, the solar controller and the connecting cable. You just have to pop off the plastic cover
from the small black plastic junction box on the underside of the panel and attach the multi-meter
clips (making sure it is set to measure VDC (Volts DC). If you are not seeing at least 16-20 volts coming
off the panel, it's kaput. Marty has replaced his TWICE with absolutely no assistance and it wasn't too
complicated. An extra set of hands would definitely have made the job easier.

When replacing the panel the first time, I used stainless steel screws, washers and cap nuts to replace the original rivets which had to be drilled out. This made it MUCH easier to replace the second time. As has been noted elsewhere, the new Taiwanese panel seems to be more efficient and durable than the original
Chinese one. [source: primarily Marty R]




The Fuse

On newer ELFs [details on which version or Elf number this was changed on would be helpful], the Solar Charging Controller is a Genasun GV-BOOST. This has a fuse in it. From the manual (available below):

If the led indicator does not light with a battery connected, or blinks the over-battery-voltage error, or the controller does not charge, the internal fuse may be blown. Check the fuse inside the GVB by removing the four screws on the bottom of the enclosure. 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, GVB- 8-Pb-24V, and lithium models with a CV voltage up to 31V (i.e., GVB-8-li-31.0V. For the GVB-8- Pb-36V, gVb-8-Pb-48V, and higher-voltage lithium models, a fuse with a higher voltage rating is required. We recommend Littelfuse part number 142.6185.5102, rated to 58V.

Owners have reported that connecting the battery while the solar panel is in full sunlight can cause this fuse to blow.

You can buy the fuse from Mouser: Littelfuse 142.6185.5102 fuse.
You can also buy the fuse from AMZ: Automotive Fuse

Basics of How Lithium Battery Chargers work: 
1. With the output voltage of the charger turned off, measure the battery voltage
2. If the battery voltage is at maximum voltage turn off the charger
3. If the battery is not at maximum voltage charge the battery using a constant current or constant voltage based on the battery voltage
4. Go back to step 1 and repeat as necessary.

Related Links

Battery not charging in the sunlight (OT official)
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Scott Cytacki,
Jul 29, 2016, 7:42 AM
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