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Author: Subject: Best fridge for solar power
Alm
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[*] posted on 8-23-2016 at 09:38 PM


Quote: Originally posted by del mar  

thats ridiculous, if you can't figure out how not to use your microwave oven at the same time your refrigerator is cycling on....maybe you shouldn't live off grid! 3K inverters don't run for free :rolleyes:

Yep. Big inverter = big overhead.

The rest of the post - that I don't know how to use microwave at the same time with refrigerator - I will attribute to too much tequila.
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imlost
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[*] posted on 8-23-2016 at 09:46 PM


An inverter refrigerator has to be more efficient than a standard refrigerator, for the same reason it's not economical to continually push the accelerator pedal to the floorboard every time you want to move your car forward a little. It only makes sense to try to match the compressor speed to the demand, and to keep the internal temp of the refrigerator as constant as possible. This technology uses a variable speed compressor, not one that goes on at full rpm until a thermocouple shuts it down. This means that at night, the compressor on an inverter fridge is running more economically than when it's hot during the day. Matching the energy to the demand only makes sense.
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del mar
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[*] posted on 8-23-2016 at 10:20 PM


Quote: Originally posted by Alm  
Quote: Originally posted by del mar  

thats ridiculous, if you can't figure out how not to use your microwave oven at the same time your refrigerator is cycling on....maybe you shouldn't live off grid! 3K inverters don't run for free :rolleyes:

Yep. Big inverter = big overhead.

The rest of the post - that I don't know how to use microwave at the same time with refrigerator - I will attribute to too much tequila.


sorry that was rude, I apologize. like I said earlier im a fan of multiple inverters sized to the task....but thats just me :)
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Alm
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[*] posted on 8-23-2016 at 10:49 PM


Big advantage of inverter fridge is that there is no on-off, no spike, no transition. In the night it runs at slower speed, but then a regular on-off fridge cycles less in the night. How much energy this saves - hard to tell.

Back to the topic.

There are different ways with on-off fridge. One is getting a dedicated small-medium inverter for a fridge. You can add a soft-start circuit if you want, but I'm not convinced this is worth the trouble. The difference in daily overhead btw 1,000W inverter without soft-start circuit and 300W inverter with a soft-start will be minor. You can also make inverter run on demand, i.e. when fridge cycles.

In the end, adding one small 100W panel to harvest those extra 0.1-0.2 KWH a day may be easier and cheaper.
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