too much current

[2windy]

Just checked the voltage going into my dump load, it read about 15 volts then started going down til it shutoff. The amps read about 7 amps. My battery bank voltage is 28.5. My thoughts were when it dumped power it dumped the same voltage as your batteries and the current just increased..

[Flux]

This dump is pwm. It will dump at battery volts but the thing goes on and off.

If your battery was at 28v and the pwm was 50% you would have 28v square waves with 50% duty cycle. A normal mean reading meter would read this a 14v.

With a mean reading voltmeter you will see a dump voltage proportional to dump current  and the mean current will be the mill current minus anything still charging the battery. When duty cycle reaches 100% you will see battery volts across the dump load and it will be a steady current equal to battery volts divided by load resistance.

If it worked as you implied the current would be constant and all or nothing.

Flux

[2windy]

Thanks again Flux... its sounds like it is working okay. It is doing exactly what you say. I didn't know quite how it work.