Author Topic: Portable solar system to run electric fans  (Read 963 times)

Offline surfivor

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Portable solar system to run electric fans
« on: June 01, 2018, 07:57:18 AM »
I am interested in a portable solar system to run a couple of fans at my camp when it’s very hot out. I would like to have one fan that blows air out the window and another fan that blows air on me. When it’s warm out sometimes my yurt gets very hot in the afternoon such that it is too hot to take a nap, cook or do anything

I have this little fan that uses 6 D batteries but it doesn’t push enough air when it gets really hot

Would I be looking at one 12 V battery and some panels? How long will the battery run the fans for roughly?  On a hot day it can be too hot from about 11:00 to 4:30. It is not hot every day and if I am not inside the yurt then I don’t need to run fans. It would be nice if such a system could run fairly powerful fans for 2 or 3 hours. There is some sun here but much of it is partial sun or direct sun only during certain parts of the day. If the system is not too heavy or bulky I could possibly place it in a more open area 1/10 of a mile back onto my property for charging

What are some good systems?

This would also be a good backup system to have. I would be Interested  in something portable so I could move it back-and-forth between my camp and my house if I wanted to
« Last Edit: June 01, 2018, 08:11:37 AM by surfivor »

Offline armymars

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Re: Portable solar system to run electric fans
« Reply #1 on: June 01, 2018, 09:27:46 AM »
  It depends on how big the fans are. It's all about voltage and current needed to run them. I once read ther was a tent design that lowered the temp. by 20 degrees. It involved a tarp above the tent with a one foot spacing. This would cause an air flow between the tent and tarp.

Offline Carl

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Re: Portable solar system to run electric fans
« Reply #2 on: June 01, 2018, 10:12:09 AM »
 :popcorn:  Just getting some fresh popcorn ,for now.BUT ,air circulation makes up for a lot of sweat and many good fans are made for RV's that run from solar direct or 12 volt battery. A small fan directed across you can do a lot and maybe you should look into a roof vent to open more circulation as hot air naturally rises and ventilation can often be fixed without use of power ...HINT for some I use are just auxiliary auto radiator cooling fans from a scrap yard.

Offline surfivor

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Re: Portable solar system to run electric fans
« Reply #3 on: June 01, 2018, 12:13:48 PM »
:popcorn:  Just getting some fresh popcorn ,for now.BUT ,air circulation makes up for a lot of sweat and many good fans are made for RV's that run from solar direct or 12 volt battery. A small fan directed across you can do a lot and maybe you should look into a roof vent to open more circulation as hot air naturally rises and ventilation can often be fixed without use of power ...HINT for some I use are just auxiliary auto radiator cooling fans from a scrap yard.

There is a large skylight but it does not have many clean edges so that installing a screen would be complicated. There are various springs and a gear where are you open it using a stick Turner.  All those things create a jagged area.

Offline Bolomark

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Re: Portable solar system to run electric fans
« Reply #4 on: June 01, 2018, 04:28:16 PM »
I installed an attic fan in gable end of my house, solar panel is mounted on an old direct TV satellite arm adjustable both ways.The sun hits it at 10 am runs until sun goes down.
it is controlled by thermostat  (72deg.)  and fuse and works great.I picked up my fan and panel from backwoods solar. no batt. 8)

Offline surfivor

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Re: Portable solar system to run electric fans
« Reply #5 on: June 01, 2018, 04:33:19 PM »
I know it was mentioned in another post that the goal zero system may be overpriced but this one for $600 (just battery) can charge a laptop 3 to 5 times. I am familiar with these so it is a place to start.

https://www.goalzero.com/shop/power-stations/yeti-400-lithium-portable-power-station/


This one will charge a laptop 17 times and cost $1300 but that is just for the battery

https://www.goalzero.com/shop/power-stations/goal-zero-yeti-1000-lithium-portable-power-station/

What are some similar alternatives and is hooking such systems to panels a simple matter?

Offline Carl

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Re: Portable solar system to run electric fans
« Reply #6 on: June 01, 2018, 05:05:27 PM »
  You shop in a higher end market than I as 100 amp hour battery can be had in the $75 to $100 range and a 100 watt panel with controller well under $200 and this would run several fans and lights for several years before needing to replace the battery and let me add that AMP HOURS is the measure to look for ....not how many times you can charge a laptop or electronic cigarette...

Offline surfivor

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Re: Portable solar system to run electric fans
« Reply #7 on: June 01, 2018, 05:52:03 PM »
  You shop in a higher end market than I as 100 amp hour battery can be had in the $75 to $100 range and a 100 watt panel with controller well under $200 and this would run several fans and lights for several years before needing to replace the battery and let me add that AMP HOURS is the measure to look for ....not how many times you can charge a laptop or electronic cigarette...

Post some links or recommend brands

I guess maybe anker was the better priced brand.

Also found this

https://bestportablesolargenerators.com/goal-zero-yeti-alternative/

Offline surfivor

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Re: Portable solar system to run electric fans
« Reply #8 on: June 01, 2018, 06:40:20 PM »

This unit looks interesting. It weighs 12 pounds and sounds like it has a lot of power for its size

https://www.chargerharbor.com/review-suaoki-120000mah-portable-power-supply/

Offline Carl

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Re: Portable solar system to run electric fans
« Reply #9 on: June 02, 2018, 06:45:47 AM »
This unit looks interesting. It weighs 12 pounds and sounds like it has a lot of power for its size

https://www.chargerharbor.com/review-suaoki-120000mah-portable-power-supply/

About 30 amp hours,if compared to a 12 volt battery, as the 120,000 mah rating is very deceptive because it is a 3.7 volt main storage cell and depends on inverters to produce usable voltages for other devices  with this you basically have 300 Watt Hours (I know that it claims 400 Watt Hours) of available power...300 watts for one hour....30 watts for 10 hours....enough to run one small (say 6 to 8 inch) fan for 10 to 20 hours or a good 20 inch fan for maybe two hours.

Fans require a fair amount of power to move quantities of air and few quality fns are designed for 12 volt battery use.


May I suggest you find the fans that you want to use for the job and work towards a power unit that will give 10 hours run time ,or more and maybe allow for a light or two ....though flashlights and portable lamps do work great also. You will have a far greater chance for success this way.


Offline Carl

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Re: Portable solar system to run electric fans
« Reply #10 on: June 02, 2018, 10:05:22 AM »
I use fans like the links below and they do move a good bit of air for 'personal' use as while in a chair or in bed on a hot,power-outage night and they run off most any 12 volt battery BUT use about 1 amp so you get about the same number of hours use as the rated amp hours of a good battery or jump pack....for TWO of this fan I would suggest an 18 AMP HOUR battery though better to use one fan per 18 Amp hours of battery to add longer life to the battery as flattening them each day is not so healthy for the chemistry. During a power outage I used a 12 amp hour sealed lead acid battery to run one fan all night and was comfortable with a recharge in the morning from my larger solar panels/battery set-up.

https://www.amazon.com/12v-Oscillating-Fan-Car-Universal/dp/B0719JVTW4/ref=sr_1_30?ie=UTF8&qid=1527954786&sr=8-30&keywords=12+volt+auto+fan

https://www.amazon.com/Zento-Deals-Portable-Oscillating-Fan-Universal/dp/B01HMV9CX0/ref=sr_1_11?ie=UTF8&qid=1527954644&sr=8-11&keywords=12+volt+auto+fan

https://www.amazon.com/Hopkins-SP570804-Go-Gear-Oscillating/dp/B003SS62PS/ref=sr_1_1?ie=UTF8&qid=1527954644&sr=8-1&keywords=12+volt+auto+fan

I don't know that one fan is better than the other and usually just buy the lower cost of these links as I usually keep a couple spares as I use some daily in my Ham shack for circulation.

Offline kid_couteau

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Re: Portable solar system to run electric fans
« Reply #11 on: June 02, 2018, 05:54:19 PM »
Hi All

Surfvivor may I ask a personal question?

Do you have any electronics experience? Please forgive I do not mean that in a catty way but as an honest question. I ask because then we know where to start.

It is only my opinion and again please forgive my bluntness but it seems that in your posts you always tend towards the Goal Zero type equipment. From what I have read and what I have built it may be good stuff but you could build an equivalent setup yourself for a lot less.

From Carl's post: https://www.amazon.com/12v-Oscillating-Fan-Car-Universal/dp/B0719JVTW4/ref=sr_1_30?ie=UTF8&qid=1527954786&sr=8-30&keywords=12+volt+auto+fan

https://www.amazon.com/HQST-Monocrystalline-Connectors-Battery-Charging/dp/B018BMGTTO/ref=sr_1_5?ie=UTF8&qid=1527983429&sr=8-5&keywords=solar+panel+100watts

https://www.amazon.com/EDECOA-Inverter-Modified-Display-Remote/dp/B074VY2RGS/ref=sr_1_23?s=lawn-garden&ie=UTF8&qid=1527983504&sr=1-23&keywords=power+inverter+sine+wave

https://www.amazon.com/Universal-UB121000-45978-100AH-Cycle-Battery/dp/B00S1RT58C/ref=sr_1_3?s=electronics&ie=UTF8&qid=1527983590&sr=1-3&keywords=12+volt+sla+battery+100ah

Heck you dont even need the inverter if you just want 12 volt stuff

Just a thought
Kid Couteau

Offline FreeLancer

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Re: Portable solar system to run electric fans
« Reply #12 on: June 04, 2018, 01:27:39 AM »
I got one of these Vornado Energy Smart fans last summer that has a high-efficiency brushless DC motor that runs off 24VDC transformer that plugs into the fan with a standard barrel connector.  It's expensive but it does move air well and can be dialed down to really low speeds to reduce noise and energy consumption.




Today I made up a DC power cord and played with running it off of 12V batteries and power supplies through a DC converter to measure the fan's current draw.  At full speed it pulled 2.2A x 24.0V ~ 53W from the converter, which corresponded to 4.2A x 13.8V ~ 58W from the power supply I was using.  At about 75% fan speed, which seems like the sweet spot in terms of noise and air flow, the fan pulled 1A x 24V = 24W.   I have the exact same design with the traditional AC motor and it pulls 72W from the wall socket at full speed, although the DC model feels like it may move a bit more air at top speed.


You could hook up two deep-cycle 12v batteries in series with a 24V solar charge controller and then run the fan directly off batteries with no conversion losses from a DC-AC inverter or a DC-DC converter. 
« Last Edit: June 04, 2018, 01:51:47 AM by FreeLancer »

Offline Carl

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Re: Portable solar system to run electric fans
« Reply #13 on: June 05, 2018, 08:40:37 AM »

Offline surfivor

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Re: Portable solar system to run electric fans
« Reply #14 on: June 06, 2018, 09:59:33 AM »
Hi All

Surfvivor may I ask a personal question?

Do you have any electronics experience? Please forgive I do not mean that in a catty way but as an honest question. I ask because then we know where to start.

It is only my opinion and again please forgive my bluntness but it seems that in your posts you always tend towards the Goal Zero type equipment. From what I have read and what I have built it may be good stuff but you could build an equivalent setup yourself for a lot less.

From Carl's post: https://www.amazon.com/12v-Oscillating-Fan-Car-Universal/dp/B0719JVTW4/ref=sr_1_30?ie=UTF8&qid=1527954786&sr=8-30&keywords=12+volt+auto+fan

https://www.amazon.com/HQST-Monocrystalline-Connectors-Battery-Charging/dp/B018BMGTTO/ref=sr_1_5?ie=UTF8&qid=1527983429&sr=8-5&keywords=solar+panel+100watts

https://www.amazon.com/EDECOA-Inverter-Modified-Display-Remote/dp/B074VY2RGS/ref=sr_1_23?s=lawn-garden&ie=UTF8&qid=1527983504&sr=1-23&keywords=power+inverter+sine+wave

https://www.amazon.com/Universal-UB121000-45978-100AH-Cycle-Battery/dp/B00S1RT58C/ref=sr_1_3?s=electronics&ie=UTF8&qid=1527983590&sr=1-3&keywords=12+volt+sla+battery+100ah

Heck you dont even need the inverter if you just want 12 volt stuff

Just a thought
Kid Couteau

 Yes, I mentioned goal zero may be over priced but it is something I am familiar with. I didn't say I was buying that necessarily but using it as starting point for comparisons. I took a digital electronics course 30 years ago, but I don't remember much of it. It may seem like easy stuff to grasp but I have so many hobbies, friendships, things to do and research all the way from trying to do martial arts, gardening, practicing guitar, going out with friends, keeping up with old friends, going surfing, cleaning my house, working out, shopping, going camping, band practice, fixing my car, working, learning new stuff for my profession, canoeing, going to church or temple, finding time to meditate, I am always juggling something and have limited time to figure anything out.

Offline Carl

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Re: Portable solar system to run electric fans
« Reply #15 on: June 07, 2018, 05:39:59 AM »
  When you get time ,you really need to add to your skill on such important things...until then,I would suggest you pay the high cost of the commercial made products  and hope for the best....in this (power needs) case get the largest capacity and as many options to charge the system as you can and give us reports of the use,care,and advantages as I personally know of no one who uses the pre-packaged option...except for the USB/phone chargers.

Offline surfivor

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Re: Portable solar system to run electric fans
« Reply #16 on: June 07, 2018, 08:15:17 AM »
I already posted a link to a unit that I thought looked interesting and it was not a goal zero system. I was on vacation last week and we had a couple of hot days that got me thinking about fans. Right now I am back at work and thinking about other things but I appreciate the links and will look at them when I have time

Offline surfivor

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Re: Portable solar system to run electric fans
« Reply #17 on: June 16, 2018, 06:53:01 AM »
I may order the Suaoki 400Wh/120,000mAh Portable Power Supply this week as well as one of the cheap DC fans Carl posted and maybe the smart fan as well. Then if I am up at my camp in the hot weather and want to take a nap in the afternoon, I will be able to stay cool

Offline Carl

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Re: Portable solar system to run electric fans
« Reply #18 on: June 17, 2018, 07:14:00 AM »
I may order the Suaoki 400Wh/120,000mAh Portable Power Supply this week as well as one of the cheap DC fans Carl posted and maybe the smart fan as well. Then if I am up at my camp in the hot weather and want to take a nap in the afternoon, I will be able to stay cool

400 watt hours is good capacity for most any of the 12 Volt DC operated fans as long as the 12 volt outlet is capable of 1 amp per fan used as many of the current power units do not use a 12 volt battery and electronics must 'step up' the voltage . I would suggest the 15 watt listed power level for fans as that power is needed to actually move a usable quantity of air.I used a small 12 amp hour battery to run a 6 inch oscillating fan for over 10 hours successfully and this is equal to about 140 Watt Hours of the rating on one of the power pack units ....so two fans over night is not out of the question with 'reserve ' power for LED lighting or cell phone recharge and I would use the recharge while mobile option or about 30 to 50 watt solar (costly) for daily planned use of the unit.

Offline surfivor

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Re: Portable solar system to run electric fans
« Reply #19 on: June 18, 2018, 06:57:41 AM »
Quote
.so two fans over night is not out of the question

 I don't need to run fans overnight. It's usually cooler at night and my camp has good ventilation. It's usually the afternoon hours that are too hot to take a nap or be inside the yurt. I generally only would need to run a fan or fans for 2 or 3 hours at the most