The SSC is a good option. Calder did a comparison of the control algorithms
for the Danfoss AEO, Frigbot SSC and the Isotherm ASU in the October 2004
Professional Boatbuilder. Of the three the SSC seemed to have the most
sophisticated program. Works similar to the AEO by monitoring run times and
adjusting speed but the SSC has an "ideal" profile that it tries to fit to
over time. The Isotherm unit really just watches the system voltage and
turns the compressor to high speed when it sees the system is being charged.
Not necessarily the best for temperature control but saves the most battery
amps.

I have an idea for a program that was sort of a blend of all three and could
do a lot more but decided that I didn't want to risk a frige full of spoiled
food because of a programming error. :-)

An interesting side note: I have met several folks who have been cruising
for a long time that complain that their compressors run to long and want to
speed them up when in actuality they are most efficient when they run 59
minutes out of every hour.

--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com

wrote in message
oups.com...
I was present during 105 degree ambient tests of the AEO in freezers
and was impressed with its performance but if you can not find them,
the next best thing is a Frigoboat SSC. I have one on my test bench
and it performs much like the AEO even adjusts for day night economy.
The SSC also has the LED built in including six differant speed LEDs.
There are a series of tests on the SSC in my 12/24 volt book. The BD50
will require a soft start feature if operated at max RPM in a warm
climate, both of these controllers have soft start features.
Dick