David: You could try setting up the parameters and then disconnecting the displays. This would prove or disprove if the display is initiating the unwanted programming changes.
I have often resisted system upgrades but once the pain of the expense and labor is past the rewards can be great. When updating systems I have rewired PV strings at the combiner to avoid lifting panels and rewiring on the roof. Good luck. William Miller Miller Solar.com 805-438-5600 www.millersolar.com On Wed, Sep 23, 2026 at 10:44 PM David Coale <[email protected]> wrote: > Hi All, > > I have a system with two SW5548 inverters paralleled together. One of the > inverters randomly changes the input parameters and ends up trying to turn > on the generator, and since there is no generator, the system gets a > fault. I have also seen it set the gen to an EQ charge. I can redo all > the settings, but this does not last long before the shenanigans begin > again. > > I took apart the buttons and cleaned them all, but this did not change > anything. I then took the cover off and cleaned the control board as best > I could and re-seated the ribbon cables. Still no luck. > > Any ideas/experieance with this? Replacing the inverters with a more > modern version would be very expensive and time-consuming, as the panels > would also have to be rewired. > > Thanks, > > David > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: [email protected] > > Change listserver email address & settings: > > https://lists.re-wrenches.org/mailman/options/re-wrenches_lists.re-wrenches.org/ > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > https://lists.re-wrenches.org/pipermail/re-wrenches_lists.re-wrenches.org/ > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org >
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