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Old 07-17-2016, 06:32 PM   #41
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$200
SID10PV
Product Specifications:
• 10 Watt
Max Head 3.5 ft
• Max Flow 3.3 gpm
http://shop.solardirect.com/product_...oducts_id=1273

I did say I need one that pumps a 30ft head
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Old 07-18-2016, 09:23 AM   #42
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"Thats no good
Only pumps a 9ft head
I would need one that does 30ft at least and they are quite expensive."

HEAD is how high a pump can lift a column of water.

Circulating water in a closed loop is mostly a skin friction and fitting resistance energy consumer , unlike lifting.

True hot water rises and cold sinks , but the energy to force heated water down is very minor.

For no real money you could lay out 50-100ft of dark hose on the cabin top and use a spare galley pump to see how much heat is added to the existing setup.

Only 2 T's and a check valve would be required.

100ft of 3/4 hose might be enough volume of water by itself for a shower.
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Old 07-18-2016, 09:58 AM   #43
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HEAD is how high a pump can lift a column of water.
Yes, and the roof, where the panels or black hose will be is 30 ft above the storage tank/existing HWS
<<< Look to the left <<<
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For no real money you could lay out 50-100ft of dark hose on the cabin top and use a spare galley pump to see how much heat is added to the existing setup.
And then where will I put my 9 x 260w solar panels?
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100ft of 3/4 hose might be enough volume of water by itself for a shower.
It probably would be, but then what happens when others want a shower?
What happens when it raining for day or 3?
I'll need to fire up an electric HWS right?
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Old 07-18-2016, 01:12 PM   #44
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"I'll need to fire up an electric HWS right?"

You bet.

Solar is for modest HW requirements in nice sunshine.

It is an augment to what the big for heavy requirements system can do.

The point is with solar a couple can easily live , well, with no main engine or noisemaker.

The big power hog is usually the reefer , if you can make and store HW while feeding that beast you are home free.

We use propane to keep the ice cream hard and beer cool, so our big energy hog is the battery bank loosing a few percent each day, which solar handles for us.
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Old 07-18-2016, 03:03 PM   #45
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Head of Water spec on pump is not really relevant. It would be if you had an open ended pipe, so the water was pouring out the end. What you're looking at is a closed loop system where water is going up to the solar panel and then back down. In that system, once it's full, the weight of the water going down is equal to the weight of the water going up. So as the water flows down on one side it pulls the water up on the other side. The pump keeps the motion going and has to provide some energy to overcome the friction loss in the tubing. The length of the tubing not the height will determine pump size. There are formulas to calculate this. That pump would be adequate for about 100ft of 1/2" tube.

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Originally Posted by Simi 60 View Post
Product Specifications:
10 Watt
Max Head 3.5 ft
Max Flow 3.3 gpm
El Sid DC Voltage Solar Pump SID10PVSS

I did say I need one that pumps a 30ft head
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Old 07-18-2016, 03:28 PM   #46
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That pump would be adequate for about 100ft of 1/2" tube.
So 30ft up in a dark locker and 30ft down in a dark locker leaves 40ft to see the actual light of day.
Doesnt sound like much
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Old 07-18-2016, 03:39 PM   #47
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Sounds like you're just being obtuse.
Good luck

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So 30ft up in a dark locker and 30ft down in a dark locker leaves 40ft to see the actual light of day.
Doesnt sound like much
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Old 07-18-2016, 03:46 PM   #48
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"I'll need to fire up an electric HWS right?"

You bet.

Solar is for modest HW requirements in nice sunshine.
It is an augment to what the big for heavy requirements system can do.
And this is my point.
Going the solar route I need two installations to make it work.



Quote:
The point is with solar a couple can easily live , well, with no main engine or noisemaker.

The big power hog is usually the reefer , if you can make and store HW while feeding that beast you are home free.
The point is that the roof space will have solar panels for generating electricity.
On the solar quote it was recommended 6 x 250 and I am going 9 x 250 (an extra $450)
Should be more than enough to run the refrigeration and probably a small 45L HWS so no "noisemaker" required.

On the days of no sun I would think feeding a 45L HWS would require far less "noise" than if I was feeding 140L HWS.
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Old 07-18-2016, 03:48 PM   #49
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Sounds like you're just being obtuse.
Good luck
How so?
Solar HWS requires sun
You say the pump is good for 100ft, 60ft of which will never see sun.
Is 40 ft of sun drenched tube enough to make a solar HWS work?

I dont want to waste time and $$ dicking around with something that is a "maybe"
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