I am installing a Growatt MPP 24 volt system in my utility trailer. I just turned it on for the first time and I am getting an 81 error "solar utility" error, with a green flashing light and a buzzing sound.
I have two strings of 2 solar panels each going into the Midnite Solar combiner box. I have each string connected to a Midnite Solar 12 amp DC circuit breaker. Each string reads 92.9 volts and 8.1 amps. However, the output at the main buss bar where the two circuit breakers connect reads 92.9 volts but only 8.1 amps. Shouldn't the combined output be 16.2 amps? I don't know if this is causing the error.
I do have a Midnite Solar SPD installed on the combiner box and the blue light is on. Also, I have the solar panels grounded to the ground buss bar in the combiner box, the ground wire from the SPD connects to the same ground bar, then a ground wire runs from the combiner box ground buss bar to a bolt on the trailer frame (I guess this would be a reference ground.)
Does anyone have thoughts about what I am doing wrong? A pic of the combiner box is attached.
Thanks for any help you can give this newbie.
I have two strings of 2 solar panels each going into the Midnite Solar combiner box. I have each string connected to a Midnite Solar 12 amp DC circuit breaker. Each string reads 92.9 volts and 8.1 amps. However, the output at the main buss bar where the two circuit breakers connect reads 92.9 volts but only 8.1 amps. Shouldn't the combined output be 16.2 amps? I don't know if this is causing the error.
I do have a Midnite Solar SPD installed on the combiner box and the blue light is on. Also, I have the solar panels grounded to the ground buss bar in the combiner box, the ground wire from the SPD connects to the same ground bar, then a ground wire runs from the combiner box ground buss bar to a bolt on the trailer frame (I guess this would be a reference ground.)
Does anyone have thoughts about what I am doing wrong? A pic of the combiner box is attached.
Thanks for any help you can give this newbie.