Solar Power





Results 1 to 15 of 15

Thread: Solar Power

  1. #1
    Join Date
    Apr 2010
    Location
    Pretoria
    Age
    62
    Posts
    60

    Default Solar Power

    Dear All
    I need advice please. I have got borehole that I use as a standby water supply. The submersible pump is powered by Eskom and I want to switch to solar power. Some facts:
    1. The borehole is rated to deliver 2000 liter/hour for 8 hours daily.
    2. The depth of the current submersible pump is 42 meters.
    3. The water is 15 meters from the ground surface. (Is this the head?)
    4. The water needs to be lifted approximately 5 meters from ground surface.
    5. The current 3 phase submersible pump is faulty and have to be replaced.
    6. There is no need to store power, no batteries are required.
    7. No need to convert power to AC.
    8. The pump will be controlled with a level switch in the tank or some other means.
    9. I would like to do the installation myself

    Questions:

    1. How do I determine what pump is required?
    2. How do I determine number/type of panels required?
    3. And where do i buy all the stuff?

  2. #2
    Join Date
    May 2009
    Location
    Hillcrest, Malaysia
    Age
    63
    Posts
    18,610

    Default

    Quote Originally Posted by MJB View Post
    Dear All
    I need advice please. I have got borehole that I use as a standby water supply. The submersible pump is powered by Eskom and I want to switch to solar power. Some facts:
    1. The borehole is rated to deliver 2000 liter/hour for 8 hours daily.
    2. The depth of the current submersible pump is 42 meters.
    3. The water is 15 meters from the ground surface. (Is this the head?)
    4. The water needs to be lifted approximately 5 meters from ground surface.
    5. The current 3 phase submersible pump is faulty and have to be replaced.
    6. There is no need to store power, no batteries are required.
    7. No need to convert power to AC.
    8. The pump will be controlled with a level switch in the tank or some other means.
    9. I would like to do the installation myself

    Questions:

    1. How do I determine what pump is required?
    2. How do I determine number/type of panels required?
    3. And where do i buy all the stuff?
    Eish. Off the top off my head, there must have been a reason the original pump was three phase AC. As in lots of power required.

    If you do go solar you are going to need it to be converted to AC to drive a reasonable pump. High power DC motors dont exist.

    If you can get a DC High power motor it's not DC. It's AC with a built in DC-AC converter and it is expensive.

    Now forget all the nonsense above.

    The most important specification you left out is how many litres of water do you want to pump a day.

    If it's 50ml get some hamsters and a wheel, if it's 5000L stick to EKSDOM AC.
    Cheers

    ZS5KAD
    3 V8's
    NA TwinTurbo SuperCharger
    A V6 and an inline 4

    The frogs are starting to notice that the water is getting warm but it is already too hot to do anything about it.....

  3. #3
    Join Date
    Apr 2010
    Location
    Pretoria
    Age
    62
    Posts
    60

    Default Solar Power

    Fluffy, thanks for the prompt reply. I have a primary borehole with a 3 phase submersible pump delivering enough water for daily use that includes watering the garden and providing water for cattle. The standby borehole is used for emergencies only. However, if I can get a constant supply of water from the standby borehole powered by sun or wind it will reduce the usage of the primary borehole.

    Regarding the most important specification left out, as stated, the borehole is rated to deliver 2000 liter/hour daily for 8 hours continuously. Cost of the system will determine the size of the pump. I think in short i need to determine what is the cost/liter.

  4. #4
    Join Date
    May 2009
    Location
    Hillcrest, Malaysia
    Age
    63
    Posts
    18,610

    Default

    There are companies that specialise in SOLAR PV Pumps in SA.

    Google is you friend.
    Cheers

    ZS5KAD
    3 V8's
    NA TwinTurbo SuperCharger
    A V6 and an inline 4

    The frogs are starting to notice that the water is getting warm but it is already too hot to do anything about it.....

  5. #5
    Join Date
    Apr 2010
    Location
    Pretoria
    Age
    62
    Posts
    60

    Default Solar Power

    Fluffy, again, thank for you prompt reply. However I was hoping to get advice from someone who did this before.
    Last edited by MJB; 2014/10/13 at 10:59 PM.

  6. #6
    Join Date
    Aug 2012
    Location
    Okahandja, Windhoek
    Age
    67
    Posts
    4,058

    Default

    There are a few solar pumps on the market. If you want a decent pump, go Grundfos Sqf, but it will cost a few bucks also. Pump would maybe R20 000 plus 300 to 400 Watt solar. http://www.sustainable.co.za/solar-p...lar-pumps.html google also watermax.

    The cheapest will be a 3 phase AC pump.

    Start by determine how much water you need per day, then selecting a pump that delivers that over 5 to 6 hours per day that and then the solar required for that. All manufactures have graphs showing what the pump can deliver at certain heads , and the solar required for that. Watermax have certain kits, but that pump needs to be serviced regularly.
    Last edited by JLK; 2014/10/13 at 11:14 PM.
    Johan Kriel

    LC's and Echo Chobe

  7. #7
    Join Date
    Apr 2010
    Location
    Pretoria
    Age
    62
    Posts
    60

    Default

    Quote Originally Posted by JLK View Post
    There are a few solar pumps on the market. If you want a decent pump, go Grundfos Sqf, but it will cost a few bucks also. Pump would maybe R20 000 plus 300 to 400 Watt solar. http://www.sustainable.co.za/solar-p...lar-pumps.html google also watermax.

    The cheapest will be a 3 phase AC pump.

    JLK, thanks, I visited this site in my search for a cost effective solution. This is seriously expensive.

  8. #8
    Join Date
    Dec 2008
    Location
    Bellville
    Age
    51
    Posts
    12,926

    Default

    Quote Originally Posted by Fluffy View Post
    There are companies that specialise in SOLAR PV Pumps in SA.

    Google is you friend.
    most definately go for a solar pump.

    the batteries and inverters to drive a traditional pump is just too expensive.


    there have been posts of members that have done this.


    Also contact DIFF on the forum. HE KNOWS his way around solar !

  9. #9
    Join Date
    Jul 2014
    Location
    Pretoria
    Age
    44
    Posts
    948

    Default

    What size tank are you talking about? Jojo? 2500l? 5000l? This will determine how much litres per hour you will need if its completely empty, and then you can calculate that at most you will have 6 hours usable sun to power solar panels. Looks like its going to get a bit expensive, as decent high wattage solar panels aint cheap.

    Look here
    http://www.hybridpower.co.za/pumps_sp_js3_18-80.php
    Last edited by WAJ; 2014/10/14 at 06:46 AM.
    NEW Project: Daihatsu ROCKY (Balboa) 4x4 2.8

    Platkar Haaihoendaai i20 1.4

  10. #10
    Join Date
    Nov 2013
    Location
    Pretoria
    Age
    41
    Posts
    53

    Default

    Quote Originally Posted by MJB View Post
    JLK, thanks, I visited this site in my search for a cost effective solution. This is seriously expensive.
    There are two options, the expensive one and the cost effective one, first question, how much water do you need? you can install a variable voltage pump, 12 to 220 AC/DC with a 70m head that pumps about 700l/day for about R10 000 or you can install a 500l/hour pump for 20 to 30k, 700l/day is enough for a household but not enough to water the lawn. The advantage is if you run out of water, you can switch to 220v for an hour and fill up the tank much quicker (a 140W panel should be enough if I remember correctly) I installed two of them on my dad's farm some 8 years ago.
    X5 E53, 2005 3.0D

  11. #11

    Default

    MJB,
    I only use these pumps. I do not have ESKOM at all.
    http://www.allpower.co.za/WaterMaxCa...s.aspx?catID=4
    2kL/hour is a lot of water for household use.
    As per the link about, I have the smallest pump on a 80W panel. It fills my 2x 5kL JoJos in two days.
    '00 Nissan D22 QD32Ti 4x4 D/C
    '10 Toyota LC150 4.0V6 VX
    '10 Yamaha XT1200Z Super Ténéré
    Our lives were governed by the Ten Commandments, good judgment, and common sense.

  12. #12
    Join Date
    Mar 2007
    Location
    Pretoria
    Age
    50
    Posts
    653

    Default

    MBJ you have a pm.

    I use the solar pump you are looking for.

    It delivers 5500 l per day from 60 m but with a different wet end you can get up to 12 000 l per day from 30 m deep.
    Gerhardt Olivier

    GWM H5 2.4
    Gwm 2.2 d/cab

    Always carry a knife, in case there is biltong or you need to stab someone in the throat.

  13. #13
    Join Date
    Aug 2012
    Location
    Okahandja, Windhoek
    Age
    67
    Posts
    4,058

    Default

    Quote Originally Posted by MJB View Post
    JLK, thanks, I visited this site in my search for a cost effective solution. This is seriously expensive.
    Cost effective will be a 3 phase AC pump, much cheaper and electricity is still cheap enough, far less than solar. Solar only make sense where you don't have grid power. Its cheaper to increase storage capacity then to go solar.
    Johan Kriel

    LC's and Echo Chobe

  14. #14
    Join Date
    May 2009
    Location
    Hillcrest, Malaysia
    Age
    63
    Posts
    18,610

    Default

    There is a similarity here with aux battery systems for camping.

    How much water you use a day (electricity) determines the size if the PV panels and pump.

    How long you can last without sunshine, determines how much you must store and hence the size of the tank.(battery)

    PV Solar tank systems have the advantage of using renewable energy when available and storing it in the cheapest possible battery available, the Jojo tank.

    Until or unless you can put a reasonable figure to consumption you will land up with a system that is over designed and hence expensive, or under designed and hence cheap but ineffective.
    Cheers

    ZS5KAD
    3 V8's
    NA TwinTurbo SuperCharger
    A V6 and an inline 4

    The frogs are starting to notice that the water is getting warm but it is already too hot to do anything about it.....

  15. #15
    Join Date
    Apr 2010
    Location
    Pretoria
    Age
    62
    Posts
    60

    Default

    Dear All
    Thank you all for your valuable inputs!

Similar Threads

  1. Electrickery for camping
    By Elders in forum Camping, Fridges, Accessories
    Replies: 1240
    Last Post: 2019/10/08, 09:23 AM
  2. Power Factor Correction hardware vs Heat Pump / Solar
    By LRwit in forum Alternative Energy Solutions
    Replies: 22
    Last Post: 2013/02/21, 01:27 PM
  3. Solar power question
    By Fanatic in forum Camping, Fridges, Accessories
    Replies: 20
    Last Post: 2012/09/09, 05:48 PM
  4. Overland Journal Portable 12V Fridge Review
    By ChrisH in forum Camping, Fridges, Accessories
    Replies: 20
    Last Post: 2011/11/30, 11:26 AM
  5. Solar Power for farm?
    By Jeanvn in forum The 4x4 Pub
    Replies: 8
    Last Post: 2010/09/07, 06:53 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •