Hi,
On our boat we have a Phoenix Multiplus 12/1200/120 which used to work fine. Currently it goes frequently into an error condition when disconnecting a 220V appliance, with three leds switching on on the control unit:
Overload
low battery
temperature
I tried to diagnose the error as we are on vacation and need the 220 V for our cooking appliance. Initially I assumed it was due to low battery (even though our battery voltage remained stable and the battery monitor indicated 75% load approx.)
Charged our battery pack with the generator, waited for the Phoenix to cool down. Tested the inverter using a small water heater. Current draw 100 Amps at 12 Volts. Ripple measured at the battery peak 300 mv at start of the heater. A pretty constant 260 mv while the water heater was in operation. No errors recorded.
Once the waterheater stopped operating I could hear what sounded like a relay switching a couple of times in the Phoenix Multiplus. The ripple current came down to zero but peaked at about 50 mV and 100 mV while I the Phoenix unit made the switching sound. Subsequently the PHoenix went into the error condition (Overload + low bat + temp).
What surprises me is that the error is generated when the inverter switches off. I had seen it earlier when pulling the plug from an ipad charger for example.
Any advice on what could be the issue?
Thanks,
Frank
