Smart Solar 150/70 2+ years old fed by 3x HIT225Watt panels (675W total) connected in parallel with an OCV of about 50 Volts. The unit is connected to a system with a CCGX, BMV-712 Smart and a 3KW/120V Multi. Fed by a 900AH LiFePO4 battery. All of it installed in an RV.
All components are up-to-date in firmware.
5 days ago while the RV was parked inside an enclosed garage and the Multi plugged into shore power, the Smart Solar started to produce error #38 shutdown. When I took the RV on a trip, these errors continued to get logged and of course the Smart Solar was shut down. I read the instructions as to how to reset but I could not easily disconnect the panels. Nothing seemed to work. I downloaded the same (latest) firmware and then force-reloaded that firmware via load-file option. That succeeded and the unit started to work OK again for the rest of the day charging the battery.
I don't believe the problem is solved because I never got to the level of charge current that would be customary on a discharged lithium battery with full mid-day clear sunshine. The panels should have been able to feed at close to 600 Watts (per prior experience) but they were stuck at a max of 420 Watts and occasionally (maybe two to three times within 30 minutes for maybe 1 minute) the input (solar panel) voltage would fluctuate wildly quickly swinging from about 43V to 16V and levels between those values. Over the 2+ years this system is operational I have never seen this kind of behavior with a totally clear sky (no clouds and no obstructions) in the middle of the day.
Am I looking at a faulty Smart Solar unit? I will check the wiring and connectors from the panels to the unit when I get back from this trip. But I seriously doubt that there is a problem that would cause this type of behavior.