Correction to my first post the LED on older compressors is connected
to terminals C and D but on BD35 and BD50 compressors it is connected
to the small + terminal and the D terminal.

wrote

Thanks for the reply Richard.

1. If you disconnect shore power from boat the question of high voltage
will be eliminated. The BD35 Module can except voltages up to 29 volts
before it shuts down compressor.

Yes - If battery charger is the cause this will help. Unit should run OK on
Mobitronic unit and has in past - But I need to do some detailed testing.

2. I have no information on Mobiletronics's inverter or how it is
wired to the Danfoss module.

FYI - The Waeco Mobitronic rectifier accepts 110V and puts out 24V nominal.
When AC is present, a solenoid acitivates which switches off DC battery
power. The DC power from the battery runs to this unit and then on to the
refrig unit Here are some links - I suppose it is possible that this unit
has a fault, because even DC from battery goes through it's internal switch.

http://makeashorterlink.com/?T1782437D

http://www.waeco.biz/tmp/MPS-35_B_d_gb_04.pdf

If one of the safety perimeters of module
is being violated there will be a single audible beep coming from
module. Is there a beep sound when unit is turned on and unit does no
run? Does fan run even if unit does not run?

I have not heard a beep and fan does not run. Unit just seems to go into
hibernation, but then it eventually wakes up after temperature in box has
risen 10F or more.

I see your site is back on - I will post later after I go down to boat.

GBM