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Has anybody experienced this problem before? Let me know if you need any more information. I am no electrician, so might have used the wrong terminology here and there, do forgive me! We live on a 60ft 2009 narrowboat in a marina, always connected to shoreline when moored. Problem: 230V power will suddenly cut out when connected to shoreline, regardless of time of day/temperature outside/what is running When power has gone off, lights (indicating battery on float charge/fast charge/inverter on) on inverter (Sterling Pro Combi S) not displaying Power can be turned back on by switching from shoreline power to inverter, which comes on, then switching back to shoreline - BUT has also switched itself back on When shoreline power is back on, inverter shows battery is on fast charge - takes approx. 1 hour to reach float/trickle charge Last occurrence: 21:30 Tuesday: 230V power turned off, 12V remained on. Nothing special turned on using 230V apart from usual fridge/freezer etc. Reading on DC Distribution: 12.7 and -07 Didn't check inverter panel Switched to inverter - working, and back to shoreline - working again Checked inverter panel - battery on fast charge (Switched between BATT 1/BATT 2 on DC Distribution. BATT 2 (starter battery) not showing on panel - discovered that was because isolator had been switched on. Switched off isolator and starter battery working as normal, engine started. Probably not related, but noting here just in case.) 22:30 Tuesday: battery on float charge 07:00 Wednesday: battery still on float charge Later on: Switched engine on, unplugged from shoreline, switched inverter on - working 08:50: Plugged back into shoreline while engine still running - no 230V power, 12V still working. Inverter panel lights not showing 09:00: 230V turns itself back on, engine still running, inverter panel - battery on fast charge 10:00: inverter panel - battery back on float/trickle charge Might also be relevant: When connected to shoreline, inverter won't switch on. Will only switch on when disconnected from shoreline - so when we are able to switch the inverter on when the 230V power goes off, does this mean that the inverter isn't registering that it is connected to the shoreline? Is one battery on its last legs/dead and causing the whole thing to cut out/drain so suddenly? I have pics of 230V/12V circuit I can attach if needed. Could there be a problem with an isolation switch for the domestic batteries, hence why 230V still off when engine running/connected to shoreline? Batteries last changed 3-4 years ago. Why did the power cut out while the engine was running, and the battery was on fast charge when it came back on? Why does whole inverter system go off when power cuts out?