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#51

Ded Driver
Member
From: West of the Border, WA
Joined: 27 May 2018
Posts: 2,875
Member
23 October 2019 10:53 pm

out of interest, also found these flowmeter with LED thermometer
https://www.ebay.com.au/itm/LED-Thermom … 0041.m2061
1571831596_led_thermometer_flowmeter.jpg


APLA member, GPX4000, modded SD2100, XTerra705, GM1000, Whites MXT Pro, Nokta Pointer, sP01 Enhancer, Garmin GPSMAP 64S, kti PLB, a map, all sorts of coils & a cupla buckets full of hope & enthusiasm

1 user likes this post: ctxkid

#52

bicter
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From: SW of Ipswich, QLD
Joined: 28 August 2013
Posts: 153
Member
24 October 2019 09:37 am

Ded Driver wrote:

just partly answered my own question by having a quick search.
12V DC 10W Brushless Solar High Temperature Water Pump 8L/min. $18.70 free postage from Hong Kong
10W equates to 0.8A @12.5V .... seems light, but I assume that is no load.
https://www.ebay.com.au/itm/12V-DC-10W- … 0677.m4598
What pump flow rate are you using ctx?

Or if you're only using it for experimentation, one of these cheaper https://www.ebay.com.au/itm/Submersible … ctupt=true may do the job, don't trust the spec though as its rated suspiciously high at 100Deg C whereas your more robust unit is rated to 55 Deg C.
I've been using this type on a couple of solar fountains for a couple of years and they work fine. They generally only last about a year but that's pumping dirty pond water with a filter that gets blocked up regularly.

Last edited by bicter (24 October 2019 09:37 am)

1 user likes this post: Ded Driver

#53

Nightjar
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From: Waikiki, WA
Joined: 26 September 2013
Posts: 1,554
Member
24 October 2019 11:12 am

If it is humid the condensation will now be diverted outside box and caught in a can.

1571875928_peltier_set_up._004.jpg


Happy Hunting, Nightjar.

2 users like this post: Ded Driver, ctxkid

#54

limpalot
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From: East of Wodonga vic
Joined: 31 July 2015
Posts: 1,067
Member
24 October 2019 12:16 pm

I like your ideas; had a similar thought for Solar Air Conditioner. If you had higher fins and had 4 of these units facing in ; a fan and you have an Air cooler.
Cheers John


Home made sluices x 2 & highbanker, ATX, Garret Supa Sluice, Quanta pan, 2008 - minelab 4500, SPO1, Makro Gold Kruzer

#55

Ded Driver
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From: West of the Border, WA
Joined: 27 May 2018
Posts: 2,875
Member
24 October 2019 12:38 pm

like this 4 unit Peltier?
https://www.ebay.com.au/itm/12V-4-Chip- … 616308b14f
1571881078_4x_peltier.jpg


APLA member, GPX4000, modded SD2100, XTerra705, GM1000, Whites MXT Pro, Nokta Pointer, sP01 Enhancer, Garmin GPSMAP 64S, kti PLB, a map, all sorts of coils & a cupla buckets full of hope & enthusiasm

1 user likes this post: ctxkid

#56

limpalot
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From: East of Wodonga vic
Joined: 31 July 2015
Posts: 1,067
Member
24 October 2019 01:01 pm

I was thinking more of a box, no ends; 4 units separate with the fins facing towards each other; that way one fan would blow air through.


Home made sluices x 2 & highbanker, ATX, Garret Supa Sluice, Quanta pan, 2008 - minelab 4500, SPO1, Makro Gold Kruzer

#57

Nightjar
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From: Waikiki, WA
Joined: 26 September 2013
Posts: 1,554
Member
24 October 2019 01:09 pm

There are a multitude of options.

https://www.ebay.com.au/b/Peltier-Coole … %7Ciid%3A1


Happy Hunting, Nightjar.

#58

Ded Driver
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From: West of the Border, WA
Joined: 27 May 2018
Posts: 2,875
Member
24 October 2019 01:17 pm

yeah Limpalot, the pic I posted is just an example. It wouldnt be hard to remove the fans, build the whole thing into a box, & fit 1 or more fans on the end of the box so to blow air though it. Would probably work ok for a small volume, like inside a car or caravan. Food For Thought!
like this one with 1 fan - axial air flow
https://www.ebay.com.au/itm/Semiconduct … SwOVlb4mNO
Nightjar, this could even present a feasible option for a couple of fridges, using ducting to blow air from the unit into 1 or more fridges, &/or a space that needs cool air (like under my false floor)

Last edited by Ded Driver (24 October 2019 01:21 pm)


APLA member, GPX4000, modded SD2100, XTerra705, GM1000, Whites MXT Pro, Nokta Pointer, sP01 Enhancer, Garmin GPSMAP 64S, kti PLB, a map, all sorts of coils & a cupla buckets full of hope & enthusiasm

#59

ctxkid
Member
From: Up Ship Creek
Joined: 12 April 2018
Posts: 2,263
Member
24 October 2019 06:07 pm

Nightjar wrote:
ctxkid wrote:

a couple of hours made 510Wh power perfect cool using 2x 100watt folding mats

CTX, Can you explain a little more what you are doing here, I'm lost? Does it refer to what you put back into your battery while running your peltier set up?

i am exploring ways of using/storing what would be wasted solar energy idea

the hot water is something that could be run on the move to burn unused current from a dc to dc thumbsup or in this case ya solar that is at camp , the battery is charged, so to use the residual current make hot or cold water , hot for washing and cold to drink cool

or in a home super efficient solar station that can be used to cut utility bills (much bigger peltier cool ):perfect:

and best of all it has been keeping my mind occupied smile

Last edited by ctxkid (24 October 2019 06:09 pm)


...................................................Such is life........................................................
Oldest Copper coin 1799 left seated half penny, Oldest Silver 1834 Shilling

2 users like this post: Nightjar, Ded Driver

#60

ctxkid
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From: Up Ship Creek
Joined: 12 April 2018
Posts: 2,263
Member
24 October 2019 06:16 pm

Ded Driver wrote:

thinking about pumps CTXKID, have you looked for one with a brushless motor?
Would be a few more money but more efficient & thus draw less Amps.
just wondering whats available.

just got a new pump draws bought .5amp , but am going back to one of these

https://www.ebay.com.au/itm/DC-12V-Subm … ctupt=true

bought the same draw , little less flow , but that is good as the heating water is better at a slower flow rate


...................................................Such is life........................................................
Oldest Copper coin 1799 left seated half penny, Oldest Silver 1834 Shilling

#61

limpalot
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From: East of Wodonga vic
Joined: 31 July 2015
Posts: 1,067
Member
24 October 2019 06:17 pm

I was thinking of a caravan setup, cost little to run and cool air in the heat of the day. Hot water for a shower at night.


Home made sluices x 2 & highbanker, ATX, Garret Supa Sluice, Quanta pan, 2008 - minelab 4500, SPO1, Makro Gold Kruzer

1 user likes this post: Ded Driver

#62

ctxkid
Member
From: Up Ship Creek
Joined: 12 April 2018
Posts: 2,263
Member
24 October 2019 06:22 pm

limpalot wrote:

I was thinking of a caravan setup, cost little to run and cool air in the heat of the day. Hot water for a shower at night.

we run on the the same rail


...................................................Such is life........................................................
Oldest Copper coin 1799 left seated half penny, Oldest Silver 1834 Shilling

#63

Occasional_panner
Member
Joined: 20 July 2016
Posts: 2,202
Member
30 October 2019 07:50 pm

Nightjar wrote:
bicter wrote:

Nightjar,
I cant tell from the eBay description, are you able to separately set the on & off temp?
For instance, turn on at 20 deg and off at 15deg.
I imagine control over the hysteresis would be important for longevity of fans etc as well as perhaps being a little more efficient with the power usage.

Bicter,
On the thermostat shown in above pic you can "set" activation temperature but not the cutout temperature.
The readout on the pic is the ambient temp (difficult to read) 23.8°C. You probably notices the Engel ambient temp reads 25°, I was fiddling remember so they don't match.
For the test I set the activation at 22°C so the Peltier is running, when the ambient drops to 20°C it will automatically cut out. The thermostat is designed this way (2°C cut out lag) so what ever device you are controlling doesn't cut in & out if the ambient temperature hovers around your set point.
No doubt there are thermostats that you can set upper & lower temps. In this instance working with the ambient temperature suffices.

CTX, Totally agree, very addictive. Years ago knocked up a random number picker 1 - 45 using led's and electronics, it worked but never gave me the winning lotto numbers. lol

These are a nightmare to work out, someone on youtube posted a good vid on one
https://www.youtube.com/watch?v=yVD0zkZTe00

Skip to 4.20 it gives the options.

I used to use these on something else but went with a custom dual channel board in the end, but they were very reliable and value for money.

Last edited by Occasional_panner (30 October 2019 07:51 pm)


Don't worry me with your problems, I have enough of my own.

1 user likes this post: bicter

#64

Nightjar
Member
From: Waikiki, WA
Joined: 26 September 2013
Posts: 1,554
Member
31 October 2019 10:46 am

Occasional_panner wrote:

These are a nightmare to work out, someone on youtube posted a good vid on one
https://www.youtube.com/watch?v=yVD0zkZTe00

Skip to 4.20 it gives the options.

Instructions post #30 makes it easy.

Going to try one of these with the Peltier setup. If successful will be handy when picking up town supplies and keeping them cool until we get back to the caravan fridge/freezer.

https://www.ebay.com.au/i/153686136252? … v3EALw_wcB


Happy Hunting, Nightjar.

#65

Occasional_panner
Member
Joined: 20 July 2016
Posts: 2,202
Member
31 October 2019 04:25 pm

Adjusting P1 will give you hysteresis, so no it doesn't have to be within 2 deg.


Don't worry me with your problems, I have enough of my own.

1 user likes this post: bicter

#66

ctxkid
Member
From: Up Ship Creek
Joined: 12 April 2018
Posts: 2,263
Member
03 November 2019 08:15 am

Thanx TJ the thermo switch link works a treat, cheers for the heads up perfect

latest pics, a coupla days ago smile

1572728951_p1130009.jpg

had some water in the can , worked ok thumbsup

1572728951_p1130010.jpg


...................................................Such is life........................................................
Oldest Copper coin 1799 left seated half penny, Oldest Silver 1834 Shilling

2 users like this post: Ded Driver, Tathradj

#67

Occasional_panner
Member
Joined: 20 July 2016
Posts: 2,202
Member
10 November 2019 08:22 am

Ctx, have you tried it without a pump, just using the thermosyphon principle
Like here https://www.researchgate.net/figure/Sch … _256854680
It would give you one less thing to fail and doesn't draw power.


Don't worry me with your problems, I have enough of my own.

1 user likes this post: ctxkid

#68

ctxkid
Member
From: Up Ship Creek
Joined: 12 April 2018
Posts: 2,263
Member
10 November 2019 06:11 pm

Occasional_panner wrote:

Ctx, have you tried it without a pump, just using the thermosyphon principle
Like here https://www.researchgate.net/figure/Sch … _256854680
It would give you one less thing to fail and doesn't draw power.

yes i tried it , but not as efficient (muuuuuuuuch slower) as pumping the water around, my latest pump is submersible and draws .4ah


...................................................Such is life........................................................
Oldest Copper coin 1799 left seated half penny, Oldest Silver 1834 Shilling

#69

Nightjar
Member
From: Waikiki, WA
Joined: 26 September 2013
Posts: 1,554
Member
10 December 2019 08:44 pm

Australia Post had these on display $60.00. Last week managed to get one for $40.00
Watch this space to see how it performs with a Peltier inserted through the wall.
When we travel 140+kms into town and back to top up supplies it maybe ideal to keep the perishables chilled until we get back to the caravan.

1575970783_chill_chest_001.jpg


Happy Hunting, Nightjar.

4 users like this post: goody2shoes, Jaros, Ded Driver, ctxkid

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