Machine Builders Network

Video Update
Slide Show
Who's Online
0 registered (), 5 Guests and 0 Spiders online.
Key: Admin, Global Mod, Mod
Newest Members
930dreamer, b4autodark, Dwayne Oxford, Jimyd, Tigerfab
2347 Registered Users
Forum Stats
2347 Members
21 Forums
1000 Topics
17380 Posts

Max Online: 64 @ 09/04/14 12:00 AM
(Views)Popular Topics
Articulating Tractor/FEL - From Scratch 1661812
THE BEAST (tracked personal vehicle) 739329
trailer tounge help 576273
Tracked Backhoe 364146
Look what followed me home!!!! 320838
Shop modifications 312302
Hendey Lathe rebuild 307167
what odd jobs did you do today? 279980
andre's tractor build 240060
backhoe plans 229116
Su M Tu W Th F Sa
1 2 3 4 5
6 7 8 9 10 11 12
13 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28 29 30
Bug Reports
Top Posters
tom 1601
Doc 1156
Lu47Dan 1108
bunkclimber 1087
mdlawnguy 860
Business Links
Enco Site Site
Ebay Site
McMaster Site
Grizzly Site
Surplus Center Site
The Farm Show
Metal Supermarket Site
Friends of MBN Site
Miller Welding Projects Site
Topic Options
Rate This Topic
Hop to:
#14916 - 05/05/15 01:32 AM Solar panel to run pump...
camdigger Offline
MBN member
Registered: 02/16/10
Posts: 135
Loc: On Assignment
The story goes that I have a need at work for a pump system to run an irrigation sprinkler or two. What I am trying to do is to find a cheap way to get rid of waste water in a pit. The temps are warm here. It is already 20C through the day May 1 here with a nearly constant breeze. I know from experience that the mid day temps will go up another 15 degrees or over the next 4 months. It is quite normal to get 90 - 120 days of straight sun, so the humidity will drop from 80% it is now to about 25% later in the season. The combination of high temperatures, near constant breeze, moderate humidity, and ample sunshine seem ideal for evaporation.

Theoretically, I should be able to power a 12V 3 or 4 amp pump from a 100W solar panel. Best would be if I could eliminate a battery. This seems ideal, the pump would run when the sun was shining and stop at night when the sun went down. The system would be very portable. hang the panel on the fence, run the wires, and drop the pump/sprinkler in the pit and walk away.... Is this feasible? I have been looking at panels and small 12 or 24 V submersible bilge pumps. I can find sprinklers at the local garden center. Some even give a decent spray pattern with no moving parts, and few restrictions to get clogged with goop.

Edited by camdigger (05/05/15 01:44 AM)
#14918 - 05/05/15 03:26 AM Re: Solar panel to run pump... [Re: camdigger]
Doc Offline
MBN Old hand
Registered: 02/12/10
Posts: 1204
Loc: Beryl Jnct. SW Utah, Mdl Nowhe... ***
Maybe my HF panels have given me a warped perspective. 3 panels net only 45W combined.

Even so I would guess it was a mater of just how much you wanted to pump how far?

Amazon has some very nice and cheap little twelve volt pumps, but low volume.(see my "spring weaning" thread for link.) Bilge pumps are fairly pricey. Even the HF 12vdc pumps are pricey now.

Most impeller style pumps don't like to run dry, so I'd add a float switch that would only energize pump when water was above intake level. You might also think in terms of mist heads rather than rain birds.

Doable, sure.... just a question of scale.
Notice: This site will cease to exist end of February 2019. Starting anew at new address: Come join us!
#14922 - 05/05/15 06:32 AM Re: Solar panel to run pump... [Re: Doc]
camdigger Offline
MBN member
Registered: 02/16/10
Posts: 135
Loc: On Assignment
Doc. My plan was to hang a submersible off a float. The sprinkler head I have in mind is designed for lawn watering. Mist heads would be better for evaporation ( increased surface area ), but mist heads usually need higher pressure and have smaller nozzles which would have tendency to plug.
#14923 - 05/05/15 02:07 PM Re: Solar panel to run pump... [Re: camdigger]
bunkclimber Offline
MBN Old hand
Registered: 02/14/10
Posts: 1101
Loc: Maryland *****
The Renogy 100W monocrystalline panels are nice..bought many on Amazon.I used to buy them on eBay from padovaimports but the price was too high at 189/ea shipped,then I spotted them on Amazon for 149 every so often,basically the same panel...rugged construction and good output to charge batts in my camper now,off grid later.In full bright sun they do about 4.5A.

Originally Posted By: camdigger

Theoretically, I should be able to power a 12V 3 or 4 amp pump from a 100W solar panel.
#14926 - 05/06/15 04:52 PM Re: Solar panel to run pump... [Re: bunkclimber]
kbs Offline
MBN member
Registered: 05/07/10
Posts: 109
I expect it may come down to a volume vs. pressure question.
In my experience, admittedly limited, higher pressure takes more energy than higher volume.
When I was tasked with watering a lake front sod install, I went with a simple sump pump (high volume, low pressure) and had the outlet placed on the high ground.
The water would flow down through the new sod, soaking in as it went.
It worked our fine.

They make "back up, 12 VDC" sump pumps.
If one would make sense for you ???
#14927 - 05/06/15 06:04 PM Re: Solar panel to run pump... [Re: kbs]
mdlawnguy Offline
MBN Enthusiast
Registered: 03/07/10
Posts: 878
Loc: maryland *****
Use a inline screen/filter on the pump end just watch the water.. scum builds fast on screen.

Donor Recognition 2010
Recent Posts
Mill Drill repair
by Lincoln
09:17 AM
m715 rebuild
by tom
07:09 PM
I couldn't pass it up
by GLyford
11/24/16 11:44 AM
THE BEAST (tracked personal vehicle)
by jeapadrenaline
11/22/16 09:47 PM
smiple centrifuge
by tom
11/21/16 11:38 PM
Kubota B7200
by terry
11/20/16 07:11 PM
Chargeur+ Kits & Product
by GLyford
11/16/16 03:54 PM
The "S" word...
by tom
11/16/16 12:32 PM
Still alive!!!
by sonny
11/13/16 06:17 PM
Truck repair
by mdlawnguy
11/12/16 02:35 PM

Shout Box

File Locker
Donate to MBN
Today's Birthdays
No Birthdays

Machine Builders Network