I have a 150/45, 100/30, and a 75/15.
Panels 3 strings all within limits to the controllers.
When I plug in the 75/15 it works fine as a stand alone, as soon as I join it to the batteries the other two start tracking to 0 then to what ever the panels wattage is. For instance 200w to 0 constant back and forth, this in turn affects the amps as well. What can I do to get all three to play nice with each other? Batteries are 3 100ah parallel.
So without the 75/15 the other two are working fine? Are you sure you have not crossed over the PV cables? Connecting the positive of string one to mppt one but negative of string one to mppt two could cause something like this. Do you have a schematic of the system?
Here are my panel setups 150/75 is 4 100watt in series about 91.2v 5.78A separated from other strings
100/35 4 100watt in series/parallel 49v 10.4A separated from other strings
75/15 4 100watt in series/parallel 49v 10.4A separated from other strings
There is no cross over since each string is separated and goes to their own breaker. The sun reaches different points in the yard so I am trying to capture what I can before the shadows come.
I don’t think they do tbh. I’m in a similar issue. They network like a family reunion after the beer cooler comes out. In my situation you’ll get a voltage drop which gets them all sorts of default and they’ll hang at the lowest voltage competing over the last chicken wing, no one wins and they’re too busy arguing, meanwhile your amperage suffers like nobody’s business.
It’s supposed to be a “master, slave” setup, but ain’t no one know who’s master or slave, they’re too busy fighting over chicken wings that the dog ate hours ago. I mean someone’s got to be in charge (pun intended)..