Solar buck converter

Author	Message
rogerdw Guru Joined: 22/10/2019 Location: Australia Posts: 955	Posted: 01:26pm 01 Feb 2024         nickskethisniks said   Did you split the input? ( one solar array/ controller) No, unless they are out of MPPT algorithm, and/or are in bulk/float. If you are entering bulk phase or float then it's normal I think, the battery can't except all energy the solar is producing. You can try to set them with each a little bit different settings. If you did calibration right, a new calibration will not help, my first controller was put on the wall and I never did a new calibration. Thanks Nick. No, I have 3kW of panels 3s4p into each controller. I don't think there is a major problem then, I'm just getting used to how they work. I might still go through and check the parameters, though pretty sure they were all consistent.   Solar Mike said   Sometimes I have 3-4 mppt controllers feeding a single battery bank, each has its own circuit breaker, have never used extra output isolation diodes, all they do is waste heat.... If you want to use them, Schottky types would be preferable, 100V 100 amp And you are correct, its difficult to get them to current share, I normally have each controller programmed for a max current limit, so under bulk charge they share current equally. Your controller looks very good. Cheers Mike Thanks Mike, looks like I was expecting the diodes to fix something that isn't an issue anyway. I also have cct breakers on the inputs and outputs of each mppt. The more I watch the displays at the various stages, the more sense it makes.