Charging a AGM 12v battery

[Sunking]

The vmp on the panel is 37.5 volts the MPPT controller says pwm + MPPT regulator in the fine print. In full sun when I put the probes on the input terminals it fluctuate between 14 and 15 Voltz. And the battery is on 12v. You can manually change the panel voltage( overcharge) if I turn the panel voltage down .1 of volt under 12v the solar input terminal voltage jumps back to 45v but it stops a the panel charge.

You have a PWM charger. Which means with your panels and 12 volt battery you get 70 watts out of a 200 watt panel.