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Max Burton fridge/freezer
#21
(04-19-2017, 08:02 PM)highdesertranger Wrote: it turned to slush it didn't freeze solid.  highdesertranger

Yep and then very quickly froze solid... do I have to submit a picture?
Andrew
Democracy is two wolves and a lamb voting on what to have for dinner. Liberty is a well-armed lamb contesting the vote. -- Benjamin Franklin (attrib.)
[Image: RVNsvc1966.jpg]
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#22
I've continued testing the Max Burton fridge/freezer, this time using the freezer compartment as a freezer. I set the temp to 15°F and put some frozen food into the freezer. The ambient temperature was 74°F. At 15°F the compressor duty cycle is about 33% on (11 minutes) and 67% off (22 minutes) and maintains the freezer temperature between a low of 12°F and a high of 17°F. I also monitored the temperature of the fridge compartment which was fairly constant at about 41°F.

The freezer compartment is about 10.5" x 10.5" x 11.5" (W x L x D) which I find is more than enough room for me. The refrigerator compartment is 11" x 5" x 6" (W x L x D) which will probably be ok unless you want to put a case of beer in it, then you might need to use the freezer as a fridge too.

Tomorrow I'll try it in a higher ambient temperature.
Andrew
Democracy is two wolves and a lamb voting on what to have for dinner. Liberty is a well-armed lamb contesting the vote. -- Benjamin Franklin (attrib.)
[Image: RVNsvc1966.jpg]
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#23
Do you have any interest in testing to see how much electricity it consumes over a given time span?

The following linked wattmeter has many clones, hook it inline on the DC power cord, if interested:

Last time I hooked mine inline, my Vitrifrogo c51is averaged 0.62 Ah consumed each hour over a 3 day period with 75F max day and ~60f lows maintaining 32.5f.

I do have extra insulation and very good condenser ventilation.

https://www.amazon.com/dp/B017YCTRKK?psc=1
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#24
(04-21-2017, 11:46 PM)SternWake Wrote: Do you have any interest in testing to see how much electricity it consumes over a given time span?

The following linked wattmeter has many clones, hook it inline on the DC power cord, if interested:

Last time I hooked mine inline, my Vitrifrogo c51is averaged 0.62 Ah consumed each hour over a 3 day period with 75F max day and ~60f lows maintaining 32.5f.

I do have extra insulation and very good condenser ventilation.

https://www.amazon.com/dp/B017YCTRKK?psc=1

Hey SternWake, yes I will do that, I want to be able to continuously monitor it for a while...
Andrew
Democracy is two wolves and a lamb voting on what to have for dinner. Liberty is a well-armed lamb contesting the vote. -- Benjamin Franklin (attrib.)
[Image: RVNsvc1966.jpg]
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#25
The wattmeter linked has an internal shunt on the (-) wire, The + can be sourced from anywhere, mean ing the + wire does not 'have' to flow through the wattmeter. Inside the + wire has some insulation stripped from it and is soldered to the circuit board. The wire is not cut.

I know this as I have replaced the 12awg leads with 8awg as I use mine on my 40 amp battery charger and 12AWG gets too hot passing that much current.

These wattmeters might or might not be able to accurately read currents below 0.15 amps. I have had some that could and others that would not.

The one I use now cannot read my 0.03 amp internal fan or the ~0.02 amp draw of the compressor controller as it awaits a signal from the thermostat to add on, So I add on 1 AH each 24 hours when i make that 0.62 AH average claim.

I use 45 amp Anderson powerpole connectors on most devices so I can hook up the wattmeter up easily and see what that item draws. I do not condiser them 100% accurate, but averaging somewhere between 85 and 95% depending on the load they are measuring.

Windynation sells a clone version with 8awg leads, and this one reads small currents nicely, but something is very OFF with the KWH and AMP HOUR figures, as they read less than half of actual consumption, yet the instanteous watts volts and amps figures displayed are all fairly accurate. Something is off in the software which counts current passed over time on the windy nation unit.

The most accurate clone I owned was the Andoer version which I no longer own. I currently employ the GTpower clones.

All these clones are taken from the original 'watts up' version which I can no longer find a link to.

Some of these clones will also display the time since they were powered up. Mine do not, well the windy nation one does, but with the WH and AH figures being soo off I do not reallly employ it other than seeing instant amps watts or volts.
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#26
(04-22-2017, 10:04 AM)anm Wrote: Hey SternWake, yes I will do that, I want to be able to continuously monitor it for a while...

I'd be interested in the results.
Doing the Van thing since the early eighties.
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#27
(04-22-2017, 12:37 PM)SternWake Wrote: These wattmeters might or might not be able to accurately read currents below 0.15 amps. I have had some that could and others that would not.
I got a great eBay deal on a Victron BMV700, so maybe I'll get a spare shunt and wire the BM to be able to log amps passed for any load or charging source.
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#28
(04-22-2017, 01:29 PM)John61CT Wrote: I got a great eBay deal on a Victron BMV700, so maybe I'll get a spare shunt and wire the BM to be able to log amps passed for any load or charging source.

That looks like a nice meter, but kind of pricey for me. That being said, I went through 4 different Chinese meters until I found one that "might" be accurate enough — there's the 45 day shipping time to put up with too — as well as what to do if it doesn't work, one that I got was doa.

I also just today saw this: http://www.ebay.com/itm/122446409220 
It's just an ammeter, comes with the shunt and is -100A - 0 - +100A, I'm tempted...
Andrew
Democracy is two wolves and a lamb voting on what to have for dinner. Liberty is a well-armed lamb contesting the vote. -- Benjamin Franklin (attrib.)
[Image: RVNsvc1966.jpg]
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#29
(04-21-2017, 11:46 PM)SternWake Wrote: Do you have any interest in testing to see how much electricity it consumes over a given time span?

The following linked wattmeter has many clones, hook it inline on the DC power cord, if interested:

Last time I hooked mine inline, my Vitrifrogo c51is averaged 0.62 Ah consumed each hour over a 3 day period with 75F max day and ~60f lows maintaining 32.5f.

I do have extra insulation and very good condenser ventilation.

https://www.amazon.com/dp/B017YCTRKK?psc=1
I got this meter today and spliced it into the power lead to the to the fridge/freezer. As soon as I verify its operation I'll start logging data...
Andrew
Democracy is two wolves and a lamb voting on what to have for dinner. Liberty is a well-armed lamb contesting the vote. -- Benjamin Franklin (attrib.)
[Image: RVNsvc1966.jpg]
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The following 1 user says Thank You to anm for this post:
Ballenxj (04-28-2017)
#30
I have some grub in the freezer so I am running it at 17°F rather than the 32.5°F SternWake used, but here are my figures:

For a 24 hour period I used 240 Wh, or 10 Wh per hour.
When the compressor is running the fridge freezer draws about 3 A at 12.5 V or 37.5 W.
Since the measured average hourly power usage is 10 Wh the duty cycle works out to about 26% which is close to what I measured by timing it a few days ago so it seems like the 240 Wh measurement is reasonably accurate, assuming the meter is accurate, but the Aervoe literature says a maximum of 3.8 A power draw, and the meter is maxing out at 4.6+. There's a minor discrepancy there...

My house battery is a single 50Ah LiFePo4 that is rated at 650Wh so I could run it for 2+ days with no charging, but with solar panels and the southwest sun the daylight hours are usually free...

I apologize in advance for any mathematical errors, my figuring ain't what it used to be...
Andrew
Democracy is two wolves and a lamb voting on what to have for dinner. Liberty is a well-armed lamb contesting the vote. -- Benjamin Franklin (attrib.)
[Image: RVNsvc1966.jpg]
Add Thank You Reply
The following 1 user says Thank You to anm for this post:
Ballenxj (04-30-2017)


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