I’m a serious off gridder, born in the backwoods of Alaska, my place there is 25 miles from the grid, here on the left coast I’m not more than a few miles away. I don’t have a POCO, I make all my electricity with the sun. Never had a power outage or system shutdown in 25 years. I have two Grape Solar 5 cu.ft. fridge/freezers and one 3 cu ft Volvo badged unit removed from a tractor trailer. All my referigerator’s are DC direct using super efficient Danfoss compressors and electronic drivers. ALL I MEAN ALL of my gear is made in America.......MidNite, MagnaSine, Exeltech Rolls-Surette etc. I don’t just talk Solar, I did commercially in the very high end “mission critical” environment for government agencies communication sites and satellites now in orbit. retired now so I just tinker and consult professionally with off gridders and state licensed contractors. I’m a federally licensed electrical engineer since 1965. I refuse to argue with someone who obviously lack experience in the field.
DC Fridge or AC fridge with inverter?
- Thread starter Offgridsteve
- Start date
The examples given are irrelevant. They do that stuff for $5 items like phone cases.
"This video capture card boasts 4.8 stars after 3,531 @amazon ratings. Only 2 reviews from the US and the rest are international reviews for DIFFERENT PRODUCTS. It's 2021, how are we still seeing blatant fraud on this TRILLION dollar company?"
Amazon.com: Customer reviews: COSTWAY Car Refrigerator, 55-Quart Dual-zone Electric Cooler with Shockproof, LCD Display, 12V/24V DC, 100-240V AC, -4°F to 50°F, Portable Car Fridge for RV Truck Travel Home Camping Vehicles, Gray
Find helpful customer reviews and review ratings for COSTWAY Car Refrigerator, 55-Quart Dual-zone Electric Cooler with Shockproof, LCD Display, 12V/24V DC, 100-240V AC, -4°F to 50°F, Portable Car Fridge for RV Truck Travel Home Camping Vehicles, Gray at Amazon.com. Read honest and unbiased...
www.amazon.com
It is not clear what the debate is about here. Should consumers completely ignore testimonials from other consumers? Including his?
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MrNatural22
?SW sunshine =⚡️⚡️lit up thru the darkness✌️
There are literally dozens of internet reviews and ratings for about anything.
look at ALL, Then use your common sense.
not what billy bob, Luke, Herman of Fred told you.
WHY do some of you depend 99% of the time, and swear by
“Amazon reviews” ?
️
Research research research research research? ????????
look at ALL, Then use your common sense.
not what billy bob, Luke, Herman of Fred told you.
WHY do some of you depend 99% of the time, and swear by
“Amazon reviews” ?
️ Research research research research research? ????????
Who is arguing otherwise? Are you saying amazon reviews should be ignored?There are literally dozens of internet reviews and ratings for about anything.
look at ALL, Then use your common sense.
not what billy bob, Luke, Herman of Fred told you.
WHY do some of you depend 99% of the time, and swear by
“Amazon reviews” ?
Research research research research research? ????????
svetz
Works in theory! Practice? That's something else
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Here's how I test my fridges.
First, I record the air temperature (indoors or outdoors)
Next, using a fridge thermometer, I note the fridge temp/settings.
For power measurement, I use a Kill-a-watt for AC, and a DC power meter/data logger for DC.
I record the the start time, and begin, I want the duration to be at least 24 hours. (more data = better)
During the test, I note any significant changes in air temperature, and check the fridge's temp at least once, to see it it is realistic. (under 40f)
At the end of the test, I record the stop time, OAT, fridge temp ,and total power consumed.
I am trying to be at least semi-scientific. Anything I am missing?
First, I record the air temperature (indoors or outdoors)
Next, using a fridge thermometer, I note the fridge temp/settings.
For power measurement, I use a Kill-a-watt for AC, and a DC power meter/data logger for DC.
I record the the start time, and begin, I want the duration to be at least 24 hours. (more data = better)
During the test, I note any significant changes in air temperature, and check the fridge's temp at least once, to see it it is realistic. (under 40f)
At the end of the test, I record the stop time, OAT, fridge temp ,and total power consumed.
I am trying to be at least semi-scientific. Anything I am missing?
svetz
Works in theory! Practice? That's something else
You're not missing it, but I'd add that you need to test freezers over a longish period to ensure any defrost power is recorded in the cycle.
Analog or digital/wireless refrigerator thermometer? I started using a wireless thermometer so I don't open the door to check. I may be a bit OCD and that doesn't work out well for the refrigerator.
Agreed, how long do you think is realistic and useful?
I do have a wireless. Good point, opening the door does skew the results, I think.Analog or digital/wireless refrigerator thermometer? I started using a wireless thermometer so I don't open the door to check. I may be a bit OCD and that doesn't work out well for the refrigerator.
svetz
Works in theory! Practice? That's something else
No clue, at least one defrost cycle I guess. It'll be interesting to hear what others do.
Or makes it more accurate if you have teenagers
But, that's probably one of the better arguments for a chest-style vs. standup
Or makes it more accurate if you have teenagers
I was thinking the same thing.
If everyone started with a couple gallon jugs of room temperature water in the fridge that would be more real world.
Sounds like a winner to me. A standard thermal mass. But why the room temperature water? If we are going that route, should we then start the test with the fridge at room temperature?
At least in the RV world, time to operating temperature is important. How many hours ahead of time do I need to fire up the refrigerator so that it's ready to be stocked?
tim0shel
Solar Enthusiast
- Joined
- Jan 27, 2020
- Messages
- 464
I think one thing to take in consideration is the insulation or thickness of a fridge. Some DC ones I've had noticed a big difference here. I guess in mild climates its not much of an issue but in the South when it gets really hot this causes one to run alot!
Ok, just attempting to come up with a standard set of rules. So, we should then place two ambient temperature gallon water jugs in the fridge at start, and we expect the fridge will also be at ambient temperature. Sound about right? Or, should the time-to-operating temperature a separate test? sounds like it might be.
Now that I think about it, I never put anything into the refrigerator until it gets to operating temperature. The exception to that is that when I'm in a hurry I put a frozen gallon of water in the refrigerator to help it cool faster.
Well I guess I was wrong about that, you CAN document negative reviews being faked. Thank you for educating me about that. The fact Amazon caught them and is prosecuting might also be an affirmation of the integrity of the system.Here is another bit of chicanery that has been going on. Trusting amazon reviews is not good advice.
/cdn.vox-cdn.com/uploads/chorus_asset/file/13443461/acastro_181114_1777_amazon_hq2_0002.jpg)
Six people indicted in Amazon Marketplace bribery scheme to help third-party sellers
The group also paid to have fake negative reviews posted on competitors’ product pageswww.theverge.com
Yes, all is fair in love, war, and business. There is far more of this going on than you would expect. Especially between Chinese companies, but also the US. Companies pay people to post disparaging reviews and comments on forums just like this one. It's almost impossible to stop when so much money is involved. I could cite a lengthy example about the skullduggery 2 scientific camera manufacturers are employing against each other.
MrNatural22
?SW sunshine =⚡️⚡️lit up thru the darkness✌️
Yep I remember when we had absorption gas/electric fridges in our camp trailers we would always start the boxes 24hrs
in advance or at least over night with frozen gallon jugs before stocking the chow in them. Never did an actual scientific
test just always used this basic method.
The DC compressor boxes we use now cool much quicker with the frozen jug method but if using room temp jugs it usually takes at least 10hrs to bring fridge and jugs down to the desired temps. We run them at 33-35deg F and it keeps the eats happy.
