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Home » Reader question » Reader question: Pumping up groundwater with a submersible pump on solar panels
Dear readers,
I live in Sakon Nakhon (Thailand) and would like to extract water from the ground for irrigation of the soil/garden. This with solar panels and a depth pump.
The pump should run on solar energy for about 10 hours (between 07.00:17.00 and 20:30) daily without the use of batteries. The pump should be able to deliver approximately XNUMX to XNUMX liters per minute.
The pump should be protected against dry running and there should be an automatic system to adjust the number of operating hours. If there is too little current, the pump should also be able to be protected (i.e. stop).
Can someone guide me more on this? Is this possible without too much expense?
Thanks in advance.
Regards,
Yvan
Hi Yvan,
Nice technical project that is fun to brainstorm about.
Questions that immediately come to my mind are:
– Is there surface water present? And can/may you use it?
– How deep is the groundwater level?
– Is there an existing electrical connection?
– Is there an existing community water connection?
– Is the area to be watered large (your plan is to pump 18 m3 of water per day)? Will it be spraying or irrigating?
First I would calculate what eea will cost you:
1. Inquire at neighbours/village how deep the water level is in order to roughly calculate what it costs to drill a well. In general, you can count on 1000 ThB/m.
2. Depending on the depth of the well you have to buy a self-priming pump (7000 ThB) or a so-called submersible pump (25000 ThB). (Walk in at homepro/Global etc).
3. If you know which pump you need, you can also calculate the required solar panels. There is also a price tag for the electrical installation including fully automatic control and protections. I think a rough estimate for this installation (fully automatic) will be 60.000 ThB. As an example, you can google for pasture drinking troughs for cows.
4.etc etc
Typing this I think it will be a challenge to approach this project in such a way that it is also financially attractive.
If you have surface water and electricity, it is possible to use a simple submersible pump with a timer. Easy and cheap and automatic. However, remember that most submersible pumps should not run for 10 hours a day due to overload and lifespan.
You may want to consider having a gardener/woman do the watering. You don't have to have a complicated fully automatic installation and you will almost certainly be cheaper in the long run.
The above is just a start to let your thoughts go about it. Plenty of possibilities.
I myself have also tried various installations in my garden, varying from an extra source, sprinkler system, drippers, fully automatic and all that on a fixed electricity connection! All resulting in a gardener who regularly takes up the hose to irrigate and also manually starts and stops the sprinkler pump.
If you want to brainstorm in more detail I can give you my email.
I'm also curious if others know of a more ready-made solution. Can I also use this in my new home?
Have fun with your plans.
Greetings Frank.
I estimate that you cannot buy something directly on the market to go from solar panel to pump. If you want to use cheaper standard products, you will still end up with a panel + inverter to 230
and then you may also have to add a small battery because a pump uses relatively much when starting.
It would be energetically more efficient to use the pump directly from the solar panels, but there is a chance that this will be custom-made and therefore more expensive.
there is therefore direct complete units for sale. see my response below
yvan
maybe this link will help you.
reliable company and english speaking staff.
recommend contacting for information.
Personally, I think that apart from the pump and the panels you also need a battery and charge controller.
http://www.thaipowertech.com/index.php?lay=show&ac=cat_show_pro_detail&pid=537210
success
Here in Khunfang we have 6 solar energy installations from the pot of rural development and rural environment via the province of Uttaradit and from Bangkok. With net support and 40 to 60 meters deep.
Costs about 35.000 to 50.000 baht per system I think. Depends on what exactly
Should have enough suppliers in Sakon Nakhon by the way.
Drive around and ask at an installation.
otherwise respond back and call my wife, she arranges things like that
Solar cell pump station 90 meters deep with frame and shielding
4 solar collectors a 340 Watt
Output 1/2 in
Capacity 90 meters deep. up to 5000 liters per hour
AC/DC converter
Total 50.000 baht
I can't make it better
There are now complete water pump systems with solar for sale without battery
seen for sale in the do home.
Dear Rori,
If, as you claim, you can install everything at the specified price of 50.000 bath, you can start working for me tomorrow. Under the condition that the pump is running, that it lifts about 20//30 Lr of water, that it is secured, in short, as I told it on the blog.
As you can read, everything is included in that price.
Greetings.
Yvan
In Lazada you see some pumps for solar operation, 12,24, 48 Volt. 1239 baht for submersible pump
These are, quickly needed, 300 W.
A centrifugal pump is not self-priming and you will need a non-return valve to keep the suction line full. This if suction happens below the pump and is also limited.
.
The largest solar panels are 320 Wp, only at optimal times. So you need several.
Then there is the arrangement. Many settings can be realized on a frequency controller (suitable for 12, 24 or 48 volts). This must of course be in a dry cabinet.
But if you have a cloudy day, the effect is 0. Too little power, or you will have a lot of solar panels.
Then you have to turn off the pump, on the other hand that thing is sputtering a bit, not great either.
So set minimum power shut down in controller.
Watering all day seems a bit unnecessary to me. You could water in the morning and in the evening.
You must have an arrangement on site, so a battery (with charger) and storage electricity is imaginary and better for the whole. With an electronic timer you can switch everything automatically. An additional flow switch for switching off the pump when there is no flow. Seems like the best solution to me.
This way you can program blocks in time, water. Your deep charge battery is charged every time when the pump is not running and power is normally always available.
A 48 volt, 300 W pump draws 300/48 +/- 7A. With a battery of 50 Ah/7, you can theoretically water for 7 hours.
The lower the voltage, the higher the current becomes, which in turn raises concerns about cabling.
You can't do a 12 volt 300 W, requires 25 A, with 1 mm2 cable, minimum, edge board 2,5 mm2.
And otherwise a cable buried in the ground to the nearest 220 volt contact point in a plastic pipe, just on 220 volts with a timer and flow switch. Then don't forget to connect to a fuse WITH earth leakage detection, since earthing in Thailand is not much or is not there.
Grounding is not just hammering a pin 1m into the ground and thinking that there is grounding. If the resistance in this is too great, the current will flow through you to ground (way of least resistance) and you can end up in the
…..dead. Anything over, even 30 mA, can be fatal. This depends on your physical condition.
Frank has also let his thoughts go and decided to hire a water woman. 555
Solar cell pump station 90 meters deep with frame and shielding (box)
4 solar collectors a 340 Watt
Output 1/2 in
Capacity 90 meters deep. up to 5000 liters per hour
AC/DC converter
Total 50.000 bath Assembled and installed
Yes, Rori if you really confirm this, I will give my phone number so we can meet better.
I live in the immediate vicinity of Phang Khon.
Greetings
Yvan
I deliver nothing. Read my LONG story explaining the situation here on the village.
rori says on December 2, 2020 at 12:11
For example, 3 large and 3 small pump installations on solar cells were delivered and installed here.
Eh without well drilling.
The point in this is delivery from Uttaradit to Phang Khon is over 500 km. So more than 1 day up and down. So travel and accommodation costs are added
According to my wife, it is certain that in your area in Sakon Nakhon there are also companies that supply systems.
I'll give you my wife's e-mail address.
Jiratchaya Vutti
Oh forgot. To dig a well you need WRITTEN and SIGNED permission from the municipality.
In any case, they are very strict about that with regard to groundwater management.
They even check self-dug surface wells up to 5 meters.
It also has to do with the fact that we have a chronic water shortage here and there are even large irrigation projects underway to transport water from the NAM river up to 15 km to the west. Very large and wide concrete gutters.
Dear Rori,
My wife also informed me about the "compulsory" application for drilling a well.
Many thanks for your useful information. I'll check with suppliers of solar panels in the neighbours. I know that solar panels are for sale in large warehouses such as Global House etc.. but finding someone there who can really help me, I don't see from experience. In the meantime I found out that there is a smaller shop in Sakon Nakhon that sells only solar panels and accessories. I'll take another chance there.
Thanks again for the effort.
Yvan
Not with Home Pro or Gobal. Are purely sales oriented. Just ask if they have m5 to m16 bolts and nuts?? Never heard of expansion bolts and or wall anchors either.
What about beam carriers? Can go on for an hour.
1. Do a search in the local community. Head and board village? Just call the mayor. In every rural community there is a central organization of residents and farmers. They do government-sponsored projects. Ask there through the woman. Oh let the WIFE or aunt do it.
2. There are certainly smaller businesses in your neighborhood that supply solar panels and pump units. Here in Uttaradit and surroundings there are about 5. I think they are not there.
Good luck