I have a 60 W, 20 V solar panel and I am trying to charge a 12 V, 70 Ah lead-acid battery with a solar charge controller.

I set the charging voltage to 14.1 V in the controller but it shows the current from solar is 0.5 A at a very sunny time of the day in summer. The max. current of the solar panel is 3 A. Why is the controller limiting the current?

  • 2
    \$\begingroup\$ Because the battery is charged or close to full charge. \$\endgroup\$
    – Solar Mike
    Jul 6 at 6:13
  • \$\begingroup\$ @SolarMike no it is less than 30%. \$\endgroup\$ Jul 6 at 9:29
  • \$\begingroup\$ Which controller are you using? How are things connected? \$\endgroup\$
    – johnEE
    Jul 6 at 9:35
  • \$\begingroup\$ I don't know if it's MPPT or PWM there is no label. the only label written is smart solar charge controller 20A. solar is connected to pv port + - and battery is connected to battery port and a led light is connected to load. @johnEE \$\endgroup\$ Jul 6 at 9:41
  • \$\begingroup\$ In what test conditions did you measure the 0.5A? Does this value change if you disconnect the LED from the load port? \$\endgroup\$
    – johnEE
    Jul 6 at 9:46


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