This isn’t a post being written about a fault or a diagnoses i’ve come across on a site, but rather just a summary of some of the more common fault codes you could ever receive from your Deye or Sunsynk inverter (i’ll do more like this on other inverter brands later down the line), what … Read more
The CT (Current Transformer) coil is probably one of the most overlooked components in a hybrid inverter installation. It’s small, inexpensive and easy to install but if it’s installed incorrectly it can cause some very strange system behavior. I’ve seen CT coils installed in the wrong location, fitted backwards, or simply left disconnected altogether. All … Read more
A PV isolation (or insulation resistance) fault is probably one of the more frustrating faults to deal with on a PV system. Diagnosing the type of fault is usually easy enough, as most inverters perform an insulation resistance check during startup and will report it as a fault. Finding where the fault actually is, however, … Read more
This was a site roughly 600km from HQ that had been sitting with a constant F58 (BMS communication fault). As a temporary workaround, the system had been set to run on manual battery settings instead of relying on BMS communication between the batteries and the inverters. The system configuration is 3 × 50kW Deye inverters, … Read more
We don’t really specialise in Victron systems where I’m currently working, but I have worked with them quite a bit in the past. One error that I’ve seen more often than I ever expected is the Error 8 – Ground relay test failed. I never properly documented a real-world case of this one, but it’s … Read more
While this isn’t strictly an inverter or fault finding case study post, we have an operation center that monitors a large amount of sites across the country. It’s extremely important for them (along with the SLA’s in place) that these loggers remain online for them to be able to monitor these sites. It’s also extremely … Read more
This one took time. Not because the fix was complicated, but because nothing made sense at first. To make it worse, the site wasn’t accessible to me physically. We have installations across the country and this one was too far out, so everything had to be done remotely. All I had to work with was: … Read more
This one was a unit that was brought in to our workshop with the client believing there was a fault with either the battery or the Deye inverter so both came in for testing as a system. The clients installer (electrician) had tested everything on site for bad connections or blown fuses etc and he … Read more
This was a site I was called out to where a 12kW 3 Phase Sunsynk inverter kept periodically presenting a W03 (or grid phase wrong fault). It would go in to W03 randomly and then clear the error itself after a while. Now normally a W03 is just a phase rotation error and can be … Read more