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86Dolphino

solar question

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Posted (edited)

I want to run two 120mm CPU fans behind my Dometic Fridge to help cooling process. I also want to fun 3 50mm fans inside the fridge to help circulate.

My question is

the 2 120MM fans are 12v @ .12amps each

the 50mm fans are 12v @ .12 amps each

so I have a total of .60 amp

to convert it to watts is 12vX.60= 7.2 watts

 

I want to wire this 7watt panel which is Rated up to 7-watt / 583mA per hour of sunlight

 

If I convert my .60 amp to mA it would be 600mA

So can I wire these fans direct to the solar panel and during the day just have the fans come on with the sun ( I may add a on/off switch to shut it down when not in use)

below are links to all items if interested

120mm fans

https://www.ebay.com/itm/12V-DC-120mm-X-25mm-Brushless-2-Pin-Cooling-Fan-LED-Heatsink-Marine-PC-CPU/132784803547?epid=10028178306&hash=item1eea974edb:g:6E0AAOSwFFJbonmZ

50mm fans

https://www.ebay.com/itm/DC-12V-0-12A-2-Pin-50x50x10mm-PC-Computer-CPU-System-Brushless-Cooling-Fan-5010/282772246839?epid=687429849&hash=item41d68a1137:g:JQ0AAOSwNeVbd-TC

7watt panel

https://www.amazon.com/Competition-Amorphous-Power-Battery-Charger/dp/B008GUHBEO/ref=asc_df_B008GUHBEO/?tag=hyprod-20&linkCode=df0&hvadid=167150549507&hvpos=1o1&hvnetw=g&hvrand=10229534100648222432&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9030895&hvtargid=pla-502885687632&psc=1


 

 

 

Edited by 86Dolphino

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Posted (edited)

The fans are good, the panel is to small you going to under v the fans and they will run slow and hot. The 7w is only at high noon with no clouds. I'd use 10-12w.

Perfect answer is a 15w panel and controller with a small AGM battery.

https://www.amazon.com/ACOPOWER-Polycrystalline-Photovoltaic-Battery-Charging/dp/B07N854MW4/ref=sr_1_7?keywords=15%2Bwatt%2Bsolar%2Bpanel&qid=1565122354&s=lawn-garden&sr=1-7&th=1

Battery...https://www.walmart.com/ip/Interstate-12V-5Ah-12V-5Ah-Sealed-Lead-Acid-Battery-This-is-an-AJC-Brand-Replacement/122436590

A thermostatic fan switch will turn off the fans when the refer isn't running

https://www.ebay.com/itm/2-RV-Camper-Refrigerator-Cooling-Fan-Switch-Thermostat-DIY-Free-ship-Instruct/121719154712?hash=item1c5706e818:g:7XcAAOxy86RSUaF4

A less glorious answer is the fan switch and run the fans off the house battery. If the fans ran 24 straight they would only use  15AH.

FWIW I run my fans this way and the low desert they will cycle on/off till way past 2:00 AM. With your proposed system your fans stop at sundown

Edited by WME

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thank you WME. ill end up going with the 15watt panel with the Temp switch and small battery.

 

My fridge gets cold but not as cold as I would like it. its always hovering just out of safe range for food storage.

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My bad I ran some numbers. a 20w panel and a 10 ah battery would be better. The 15w panel would be right at the edge

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once I get my driver side wall issue repaired (which I'm working on now) I will get a 20w panel a small battery and a thermostatic fan switch. that sounds like the right way to go.

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FWIW here is my set up. It runs off the house batteries and the 280w worth of solar panel. The 2  100w glue down panels failed after 1 year and I now have a single 280w traditional panel.

http://toyotamotorhome.org/forums/index.php?/topic/10205-my-frigeumrator-dont-kul-gooder/&tab=comments#comment-95165

 

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