I have actually spoken with Hychill a number of times, but the negativity that surrounds HC's is overwhelming. And, I think that it is illegal to charge a system above 300g??? Is that correct?
I found widespread negativity as well bit whilst researching the use of HC's discovered that they are in common use in domestic refrigeration equipment
and figured that if the usual propensity for over-regulation in Europe
applied to refrigeration systems and European bureaucrats allowed it's use it was probably safe.
I don't know about the 300g limit but suspect that since the refrigerant regulations
are State based there would be seven sets of rules, sort of a rerun of the rail gauge thing.
I found the eutectic with timer system to work very well. The box did not actually have a eutectic tank in it so I just put a plywood
false floor in about 100mm above the bottom, pored in about 75mm of water
, and rigged a computer fan so that it blew the cold air from the evaporator plate over the top of the water
. It was sort of a Rube Goldberg arrangement but it worked beautifully the only down side being the loss of usable volume from having both an evaporator and the eutectic set up in the same box.
I have removed the evaporator and computer fan and am rebuilding the box with a false bottom which will seal (the old arrangement never caused a problem, I just don't like the idea of the possibility of eutectic fluid sloshing about with the groceries) and will install a copper tube evaporator coil under the false bottom.
Danfoss have a controller for the BD50 which allows the compressor
to run directly from the solar panels
without the use of a battery
. I am also considering trying one of these and installing a second thermostat which will control a connection to the house batteries in the event the eutectic fluid temperature rises above the eutectic temperature.