[RE-wrenches] Solar direct water pumping

[Ray Walters]

Just with all other solar equipment, you definitely don't want to go 
CCC.  I'd recommend you take a look at the Grundfos SQ flex line.  2nd, 
you need to look at the pump charts to see what the actual flow rate 
will be at the head you're considering.  The pump you are looking at 
doesn't even give basic flow rates at pressure. (2nd clue it sucks) Max 
head is basically where the pump quits pumping, and the 8 GPM rating is 
at no pressure at all.  I'd "guess" it would pump maybe 4 to 6 GPM at 40 
ft of head?  Also, add extra head for the friction losses in the pipe.  
That can be looked up (just like wire losses) for the size pipe and flow 
rate.

Finally, you didn't mention how large a pond.  To fill the pond, it 
needs to overcome both evaporative losses, and leakage into the 
surrounding soil.

Ray Walters
Remote Solar

On 5/8/2023 10:04 AM, Howie Michaelson via RE-wrenches wrote:
> Hi,
>
> I have a friend/client that is looking to keep his pond filled with 
> water pumped from a spring downhill from the pond. He's happy to have 
> the pond filled just when there is enough sun to pump, so no batteries 
> are desired. I have little to no experience with water solar direct 
> pumping, so I'm a little leary of spec'ing anything. The pump will sit 
> 5 feet deep, the distance from spring to pond is about 120' and the 
> head is about 30-40' .  He found a pump on Amazon:
>
> https://www.amazon.com/Submersible-Stainless-Built-Circulating-Brushless/dp/B083NHH18K/
>
> Again I know virtually nothing about this topic so I'm not clear 
> whether this pump is appropriate or not.  Any advice is appreciated.
>
> Howie
>
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