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Old 06-11-2014, 07:40 PM   #21
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I am becoming a bit fanatical on 12 volt current conservation I guess. I have 735 watts of Solar with a 400+ watt wind generator feeding 10 golf cart batteries for 1125 amps. Pretty robust. Just got the boat and am learning the systems, last night I was down to 12.8 volts so I fired up the charger, was cloudy yesterday and today. Charger off all day now at 14.2.
That`s an impressive battery array and feeding system. A query, batteries at 12.6v and above are fully charged, firing up the charger seems unecessary.
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Old 06-11-2014, 09:21 PM   #22
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I am just learning the systems. And I guess I am more than a bit on overkill mode. The air x helps in a breeze too. I thought anything below 13 was time to start charging.
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Old 06-11-2014, 10:20 PM   #23
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That sounds very robust, Mule. Do you have a SOC meter? 12.65V on L-A wet cell is full charge at rest.

Measuring State-of-charge - Battery University
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Old 06-12-2014, 02:12 AM   #24
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I am just learning the systems..... The air x helps in a breeze too. I thought anything below 13 was time to start charging.
Your set up would be the envy of most. I doubt you`d need genset charging often. If it`s not sunny it`s often windy, you`ve got your bases well covered.
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Old 06-12-2014, 07:00 AM   #25
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My hat is off to Mad Dog Mike. Tragic situation, he refit this boat in all areas to this standard, 3mo in Abacos wife had health issues. When he decided to sell I got a call. Hate to make out on another's misfortune, he said glad it was me. We have known each other for awhile.
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Old 07-03-2014, 05:42 PM   #26
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Change out bridge ice maker

I currently have a U-Line SP28WH that I would like to replace with a freezer. It's located on the bridge and I do have room for a larger unit. Suggestions?

Sorry...this is my first post and I have no idea if this is the right protocol
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Old 07-03-2014, 06:14 PM   #27
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https://www.engel-usa.com/products/f...fridge-freezer
I have a new one of these for sale. It is a fridge or a freezer. Very low 12 volt draw, works on 110 also. About the size of a standard 48 quart ice chest. Keeps my ice cream rock hard. I need $700, $150 off. I have never found a discount. I have 2 other Engles and after selling I am going for another, swing door upright. 817 360 5561
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Old 07-03-2014, 11:06 PM   #28
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I have one of these. This is a good price for a 113 qt. unit but the shipping cost is BS ($103). Look around I bought on for around $780 with shipping two years ago.
Dometic CF-110AC110 Waeco CoolFreeze Portable Fridge Freezer AC/DC CF 110AC 110 Trailer Camper RV
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Old 07-04-2014, 05:05 AM   #29
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Just a thought. Why not get a Domestic freezer to your exact dimension and use a step up inverter ?
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Old 07-04-2014, 09:15 AM   #30
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Thanks. I didn't know Dometic made a freezer that size.
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Old 07-04-2014, 09:24 PM   #31
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Mule. I had the pleasure of observing Mad Dog Mikes restoration of your boat. Everything on that vessel is to a standard of excellence that is beyond reproach. You got a heck of a boat. Sorry to hear of their problems. really nice folks.

Enjoy .
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Old 07-09-2014, 07:49 PM   #32
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Just an FYI on how these compressors work, they are all AC compressors, when running on 110VAC they simply use a step down transformer but it's still AC supplying the compressor. Once you switch to DC that's where a DC switching supply is used in other words a square wave inverter, different taps are used on the same transformer for the 12VDC switching supply/ inverter that supplies the compressor it's quasi AC.
Perhaps that's why they run better on 110VAC or at least the manufactures say so.
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Old 07-10-2014, 07:35 AM   #33
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Just an FYI on how these compressors work, they are all AC compressors, when running on 110VAC they simply use a step down transformer but it's still AC supplying the compressor. Once you switch to DC that's where a DC switching supply is used in other words a square wave inverter, different taps are used on the same transformer for the 12VDC switching supply/ inverter that supplies the compressor it's quasi AC.
Perhaps that's why they run better on 110VAC or at least the manufactures say so.
Bill

Not sure I can relate what you're saying to what NovaKool told me, Bill.

Their tech said it's a DC compressor in ours. If provided AC, that's converted to DC first (as with a laptop, cell phone charger, whatever)... so the compressor always runs on DC, no matter what the original source.

??

FWIW, we did also touch on the slight inefficiency that would be introduced with an inverter: changing DC to AC with an inverter, and then converting it back to DC during the fridge's power supply process. I don't know if that would be a big deal (don't have an inverter, haven't studied), assuming the inverter is doing other useful work at the same time anyway...

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Old 07-10-2014, 07:39 AM   #34
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Not sure I can relate what you're saying to what NovaKool told me, Bill.

Their tech said it's a DC compressor in ours. If provided AC, that's converted to DC first (as with a laptop, cell phone charger, whatever)... so the compressor always runs on DC, no matter what the original source.

??

-Chris
That's what I originally thought until I helped a few other boaters with Dometic frig/ freezer repairs.
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Old 07-10-2014, 08:02 AM   #35
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That's what I originally thought until I helped a few other boaters with Dometic frig/ freezer repairs.
Bill

Ours aren't Dometic.

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Old 07-10-2014, 08:12 AM   #36
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Thanks Chris, I just haven't seen a DC compressor yet. It might be possible that the units shown (thread starter) don't use compressors and maybe these units use Thermo-Electric (TE) module technology instead?
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Old 07-10-2014, 08:37 AM   #37
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Bill, here's from the "Installation and Troubleshooting Manual (2005)":

All Nova Kool units are supplied with the silent and efficient BD
series variable speed compressors from Danfoss. Nova Kool has supplied your
unit preset at the optimum speed for most “normal” applications. The speed is
controlled by a resistor in the thermostat
circuit. 0 ohms (no resistor) runs the
compressor on its slowest speed, a 1523 ohm
resistor will provide you with the fastest
speed. The slower the speed, the lower the
amp draw, and the lower the capacity. The
chart provides four examples, the resistance

must be between 0 ohms and 1523ohms.


FWIW, there's another statement about cooling:

AC/DC units cool at the same rate
on DC as on AC.



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Old 07-10-2014, 08:42 AM   #38
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DC 12V 24V Refrigeration Compressor 134a QDZH30G New in Box | eBay

DC 12v - 24v refrigeration compressor~134A~QDZH30G~NEW IN BOX
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Old 07-10-2014, 08:46 AM   #39
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If it's a Danfoss 35 or 50 compressor, it's 12/24 volts.

Most of the Italian manufacturers use this. It's what I have in my Vitrifrigo, which I love by the way.

http://www.ra.danfoss.com/TechnicalI...cei100b602.pdf

Also as Bay Pelican mentioned, my AC wiring is such that the inverter only runs a few necessary 120 v appliances when not plugged into shore power or Genny.
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Old 07-10-2014, 09:02 AM   #40
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I stand corrected thanks for the documentation on the DC Danfoss compressors.
Thanks all,
Bill
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