So, we have two refer units on board, one older than the other, both are 110VAC and 12VDC capable...evidently the PO wanted two refrigerators for live-aboard....
During checkout I discovered that although both refer units worked fine on 110VAC, only one unit worked on 12VDC. Not thinking anything of it, I switched on the Inverter
and HO-LA! the second refer tried to come on...but when it did it made a "things-arn't-sounding-too-good" operational noise
(I suspect, from the compressor). Of course I immediately shut it, and the inverter
, off. Checking further, I found that the PO had disconnected the 12VDC side of the unit making all the noise
. On a whim, I hooked up the 12VDC side and WA-LA! it started right up and ran smoothly (Insert happy face here).
Now I have both refer units running well on either 110VAC shore power
or 12VDC boat battery
power....and I have plenty of power on the boat to run both if need be...but...and this brings for me the questions of the decade...when I turn on the inverter the older unit switches over and tries to run off the 110VAC inverter which has a modified sine wave. I'm not sure whether the new unit tries to run off the inverter because it's so quiet.
1st question is about running compressors on a modified sine wave inverter...is this a good thing, bad thing, or doesn't make any difference thing? Both compressors seem to run fine off the boat banks (although they do tend to dim the lights downtown...
2nd question is about the default relays in the refer units. My experience so far says that when plugged into shore power
(or the inverter) the relays are set up so that they will default to 110VAC. My units seem to run fine as long as I manually turn off their connection to the 110VAC line when I turn on the inverter. Does anyone know if this is true (default to 110VAC) for all dual voltage refer units or just some?
Thanks to all who've read this far...inquiring mind just wants to know.
Ray on S/V Pure Joy