BFL13 wrote:
pianotuna wrote:
Just do it. It is not as if you are dealing with 90 amps.
If he has the 80amp PD going as well as say 20 amps of solar, he would equal his 100 amp fuse on that path. If he passed the solar along the inverter wires it would only add up to the solar amps on that 80 amp fuse there.
I am not clear on what happens if the amps are opposing direction on the same wire. What would the solar controller think is going on if it is trying to pass 20 amps to the battery along a wire that had 10 amps coming the other way to the inverter?
You do have inverter/chargers using the same DC wire set for both functions, but I am unclear if that would ever be at the same time.
I was never going to connect the controller to the PD cable for just that reason, I was going to have the inverter and the controller on the same cable, so I'm thinking when watching TV the inverter draws about 8 amps, if the solar controller is putting out 20 amps the net flow would be 20 - 8 = 12 amps TO the batteries.
I asked Morningstar, originally their tech support guy "Joe" didn't understand the question and said no, inverter and controller on the same leg is not a good idea, then he said he'll ask one of their engineers, then emailed and said he talked the the other tech support guys and said I'd be okay. So not exactly a glowing endorsement... ;)
