Been in contact with the place I bought my BlueSolar 75/15 and Bluetooth dongle and want to hear if someone experienced similar
Its installed in a 4x4 with 100+80w solar panels in series (lots of cloudy days in scotland) It feeds a 12v 90ah deep.cycle battery which mainly runs LED lights and a fridge. Battery is connected to started battery via a Victron Cyrix battery combiner.
Been working well for 2 years and then other day noticed when turning rear LED worklight an approx 1amp load the light output is low and constantly fluctuating. Measured load terminals on the Charge controller and it swings from 5 to 11 volts. The battery voltage is stable at 12.50v at same time. Day was sunny and 34v from the panels and charging state float. When turning on more lights the load voltage drops to 0v and at somepoint it came up with battery overvoltage 23v alarm. Switched loads off and voltage dropped slowly to approx 12v. When disconnecting solar panels and in evenings the unit turns fully off, no light in diodes and not visible via bluetooth
When the engine is running and battery combiner is active both batteries are 14.2 volts. Battery terminal of charge controller is stable at 14.2v Thou when load above 1Amp is applied the same voltage fluctuation in the victron app occurs and lights goes dim and bright randomly
Tried disconnecting the main battery and no change in behaviour. Tried another LED light with approx 1.5amp load and same story.
Is it a faulty unit or is there something else that needs to be looked at? The battery overvoltage error really puzzles me as no changes to wiring and then appears normal again.