About 6 months ago I set up a solar system on my offroad teardrop trailer. It consists of a Suaoki 100W 18V 12V Solar Panel Charger, a Sun YOBA 20A 12V 24V Solar Charge Controller and a 12v wet lead acid battery all connected with 10 guage wire and MC4 connectors. It worked fine until a couple of weekends ago I pulled out the trailer to take it out and found the battery dead. I charged it using a 110 source with a charger. The solar controller showed that I wasn't getting sufficient voltage from the solar panel. I tested the wires coming directly from the panel and got ~15-17 volts, but the charge controller showed 9 or less. The battery was showing 12.4 volts When I connected my volt-meter to the charge controller connections to the solar I got that same less than 9 volts. Whenever I connect the solar panel to the charge controller the voltage coming out of the charge controller would drop. I assumed there was something wrong with the solar controller and replaced it with a HQST 30 Amp PWM Smart Solar Charge Controller with LCD Display but had the same problem. I have tried cleaning all of the connections and putting dielectric grease on them, it didn't help.
What could be going wrong? is my panel going bad and making the voltage, but not enough amps to overcome resistance?
What could be going wrong? is my panel going bad and making the voltage, but not enough amps to overcome resistance?
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