My Smartsolar 100/30 controller shows low wattage coming from my panel array but shows the correct voltage. Measured amperage from the panels on a recent cloudy day was around 4-5 amps but the app reports 8 or 9 watts and 0.5 amps in bulk charge mode. It takes forever to charge the 200Ah battery. When originally installed everything was working correctly showing appropriate amperage. At some point there was a firmware update for the charger and things seemed to go downhill after that although it could be a coincidence. Any suggestions? I have checked/replaced connections to no avail.