Fridge fans again.

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Jcloughie

Jcloughie

Jun 16, 2020
5,518
2,471
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In my last Lunar caravan I fitted a fridge fan made from bit I bought from China. It worked beautifully, it could just be heard turning on and off during daytime hot weather. And the fridge was noticeably cooler in 36 degree temperatures.

I have just purchased a new fan kit for our new van. But after using the van for a few days in quite hot weather and being very impressed with the fridge and freezer operation. I may not fit it.

But, if I do, I may first make a modification to the kit. And I am looking for some advise.

I have tested the kit with a USB power supply and it works well. But I had to first decipher the controls. If anyone wants to purchase they are available on eBay, Amazon and AliExpress. I paid £13.

Instructions:
  • Power up
  • Press left button once
  • Scroll through until screen shows ‘P0’
  • Press left button to select
  • Use arrows to set the temp the fans should turn on, (say 32, needs trial and error)
  • Repeat, but setting with P2 and set the lower temp at which the fans will turn off.
Instead of using a USB power supply. I am considering wiring directly to the 12 volt circuit via a fuse. The control box should be fine, as it says 12 volt on the back. But the fans are rated at 5 volt..

I would re-wire these in series, which might put around 7 volts in use. (I think the will just run a bit faster, if they blow, so be it. 12 volt fans are cheap enough).

Any comment on my logic.

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John
 

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noggin16460

noggin16460

Mar 12, 2025
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13
15
Jcloughie said:
In my last Lunar caravan I fitted a fridge fan made from bit I bought from China. It worked beautifully, it could just be heard turning on and off during daytime hot weather. And the fridge was noticeably cooler in 36 degree temperatures.

I have just purchased a new fan kit for our new van. But after using the van for a few days in quite hot weather and being very impressed with the fridge and freezer operation. I may not fit it.

But, if I do, I may first make a modification to the kit. And I am looking for some advise.

I have tested the kit with a USB power supply and it works well. But I had to first decipher the controls. If anyone wants to purchase they are available on eBay, Amazon and AliExpress. I paid £13.

Instructions:
  • Power up
  • Press left button once
  • Scroll through until screen shows ‘P0’
  • Press left button to select
  • Use arrows to set the temp the fans should turn on, (say 32, needs trial and error)
  • Repeat, but setting with P2 and set the lower temp at which the fans will turn off.
Instead of using a USB power supply. I am considering wiring directly to the 12 volt circuit via a fuse. The control box should be fine, as it says 12 volt on the back. But the fans are rated at 5 volt..

I would re-wire these in series, which might put around 7 volts in use. (I think the will just run a bit faster, if they blow, so be it. 12 volt fans are cheap enough).

Any comment on my logic.

View attachment 9167

View attachment 9168

John
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Any chance of a link please
 
ProfJohnL

ProfJohnL

Mar 14, 2005
18,885
4,124
50,935
With the exception of the output voltage you have suggested, the rest of the plan seems logical.

The reason I question your output voltage is these sorts of device are likely to use a relay to control their output power, so the output voltage is more likely to be the same as the input voltage. in your case 12V.

I do wonder if putting the two 5V fans in series and running them on 12V, might make them too noisy.

I have often fitted fans to pieces of electronic test gear, and its quite common for example to use a 24V fan just running on a 12V supply, for situations where only a light air movement or low noise is required.
 
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