We had a problem with the inverter/charger when plugged into the marina mains supply. It would not switch over to charging the batteries, we had reported this to Black Prince, and they said they would sort it.
The old inverter was replaced, and we still had the same problem, back at their base they tested the old inverter, and it worked without a problem.
One possible thing that could be causing this is an over voltage on the marina supply, the Photonic Universal 3000W unit maxing out at approx. 263V. Normal UK supply used to be 240V, but I believe in 1987 we have harmonised with the rest of Europe at 230V +/- 10% (which therefore includes our UK 240V) with a theoretical max of 253V.
The next step they replaced the Photonic Universal 3000W unit with a Sterling PCS123500 unit, this gives us a slightly higher max output to 3500W but also accepts a higher shoreline input voltage of up to 270V.
All the work in now completed, and we will see in the next few days if this has been a success. We have only had excellent service from Black Prince on any problems we have had, there will always be problems, that is to be expected. It is how well they are dealt with that makes the difference.