WE have a new Waeco Coolmatic icebox conversion unit that we installed
earlier this year. This is the unit:
http://www.defender.com/product.jsp?path=-1|406|10789|86418&id=323775 This
unit uses the Danfoss BD35F compressor & controls.

It was installed with an optional Mobitronics AC power supply (when AC is
present, solenoid switches from DC to AC). This unit puts out 24V with 110V
input - Spec says nominal output voltage is 25V and no-load voltage is 29V.
The unit is purpose made for the BD35 compressors.

PROBLEM: This weekend, the compressor would not come on for long periods (on
AC or DC) - temperature would rise to 48F or so. (Expected about 38F based
on setting). Eventually, just when I thought the unit was completely dead),
it would kick in and run again. Nothing I did such as switching unit on/off
or rotating thermostat to different settings would cause any reaction).
Previously, the unit would cycle on and off and maintain temperature in a
narrow band. Only change that I can see, is that the batteries were fully
charged last night and we were at a different dock (for AC)

The Waeco manual says:

12v Cut-in voltage 11.7V Cut-out voltage 10.4V
24V Cut-In voltage 24.2V Cut-Out voltage 22.8V

Distance from batteries is about 10 ft. Wire size is 8ga except for
Mobitronics unit which has short leads of lighter wiring (about 1ft in/out)

Do you think it is possible I am getting cutout due to too HIGH a voltage?

(I don't suspect too low, because I have run unit mostly with undercharged
batteries with no problem.)

I did measure voltage at Refrig teminals (unit not running) but with charger
on and it was about 12.7-13V) - I forget 24V number, but I think it was
something like 25.2V.

GBM