Page 2 of 2 FirstFirst 1 2
Results 21 to 37 of 37
  1. #21
    Join Date
    Mar 2008
    Location
    De Wildt
    Age
    58
    Posts
    42,457
    Thanked: 19480

    Default Re: Not grid tied, solar when the sun shines

    Quote Originally Posted by Die Uwe View Post
    Please read my OP again. I dont want this setup to be reliant on Eskom. The answer then is not go grid tied. The answer is add batteries.

    I dont care about break even. Break even calculations is not going to help me anything if worst case scenario, Eskom is unavailable for days on end
    You then need to size the batteries first, and thereafter calculate how many panels needed to recharge the batteries with consideration for a week of rainy days scenario...............or else buy a generator which will solve all your problems and be cheaper in the long run?
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

  2. The Following 2 Users Say Thank You to jelo For This Useful Post:


  3. #22
    Join Date
    Aug 2009
    Location
    george
    Age
    46
    Posts
    262
    Thanked: 176

    Default Re: Not grid tied, solar when the sun shines

    Quote Originally Posted by Die Uwe View Post
    That is the idea yes. I wasnt aware of the 8x normal kw on a borehole pump startup. If that is indeed true and my borehole pump is 1.5kw as I suspect, then I will hae no choice but getting the batteries from the start.
    If i may. Perhaps invest in a heat pump like i did years back to replace normal geysers. Mine heats up 2 x 150L gesyers from 35 to 55 degrees in 3 hours and it stays that temp for many many hours. It chows 1.5kw, so much less than a normal geyser, much more efficient. On my pool pump, 750w, start up i see on graphs is not that hectic, once start up is over, yours will pull 1.5kw. So in essence, you need a 3.6kw inverter in my humble opinion.

  4. The Following User Says Thank You to ezee rider For This Useful Post:


  5. #23
    Join Date
    Mar 2008
    Location
    De Wildt
    Age
    58
    Posts
    42,457
    Thanked: 19480

    Default Re: Not grid tied, solar when the sun shines

    Quote Originally Posted by ezee rider View Post
    So in essence, you need a 3.6kw inverter in my humble opinion.
    Yep, around 4kW will do the job..........
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

  6. #24
    Join Date
    Jun 2018
    Location
    White River
    Age
    34
    Posts
    335
    Thanked: 375

    Default Re: Not grid tied, solar when the sun shines

    I would install a solar borehole pump and another gas geyser
    Mike

    Out in the bush!

    2012 Amarok with a transfer case
    1956 Series 1 (now in boxes, Covid delayed the rebuild)
    1999 Land Cruiser 105 EFI

  7. The Following 3 Users Say Thank You to AfricainHD For This Useful Post:


  8. #25
    Join Date
    Oct 2010
    Location
    Pretoria
    Age
    62
    Posts
    1,844
    Thanked: 942

    Default Re: Not grid tied, solar when the sun shines

    Quote Originally Posted by jelo View Post
    Yes, you need to take the pump and geyser off grid and have an off-grid system with panels and batteries.
    That means NOT running the pump or geyser off solar, but off battery and these are recharged later or even in parallel.

    5kWh = a BUNCH of deep cycle batteries with battery protection. Not so simple.
    Have you had a look at the inverter specs he posted?

  9. #26
    Join Date
    Mar 2008
    Location
    De Wildt
    Age
    58
    Posts
    42,457
    Thanked: 19480

    Default Re: Not grid tied, solar when the sun shines

    Quote Originally Posted by AfricainHD View Post
    I would install a solar borehole pump and another gas geyser
    yes indeed

    The solar pumps can run at varying speeds AFAIK.

    Just be careful though: there is a limit to the head height.

    https://shop.thesunpays.co.za/pages/...borehole-pumps
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

  10. The Following 2 Users Say Thank You to jelo For This Useful Post:


  11. #27
    Join Date
    Mar 2008
    Location
    De Wildt
    Age
    58
    Posts
    42,457
    Thanked: 19480

    Default Re: Not grid tied, solar when the sun shines

    Quote Originally Posted by faniedup View Post
    Have you had a look at the inverter specs he posted?
    I had a quick glimpse, didn't concentrate on the battery connection, why?
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

  12. #28
    Join Date
    Jun 2018
    Location
    White River
    Age
    34
    Posts
    335
    Thanked: 375

    Default Re: Not grid tied, solar when the sun shines

    Quote Originally Posted by jelo View Post
    yes indeed

    The solar pumps can run at varying speeds AFAIK.

    Just be careful though: there is a limit to the head height.

    https://shop.thesunpays.co.za/pages/...borehole-pumps

    Yes, and the head plays with the price substancially as well.

    Changed all of the borehole pumps in the reserve to solar a few years back, heads varied from 60m to 160m. Best thing that we did. It just worked. Fit and forget type of thing.
    Mike

    Out in the bush!

    2012 Amarok with a transfer case
    1956 Series 1 (now in boxes, Covid delayed the rebuild)
    1999 Land Cruiser 105 EFI

  13. The Following 2 Users Say Thank You to AfricainHD For This Useful Post:


  14. #29
    Join Date
    Mar 2008
    Location
    De Wildt
    Age
    58
    Posts
    42,457
    Thanked: 19480

    Default Re: Not grid tied, solar when the sun shines

    Quote Originally Posted by AfricainHD View Post
    Yes, and the head plays with the price substancially as well.

    Changed all of the borehole pumps in the reserve to solar a few years back, heads varied from 60m to 160m. Best thing that we did. It just worked. Fit and forget type of thing.
    I have a 1.1kW 3ph pump running at 230m..........

    Cheaper to leave it be and put in a 3ph inverter and panels than to try buy and run a solar pump solution at that depth.
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

  15. The Following User Says Thank You to jelo For This Useful Post:


  16. #30
    Join Date
    Oct 2010
    Location
    Pretoria
    Age
    62
    Posts
    1,844
    Thanked: 942

    Default Re: Not grid tied, solar when the sun shines

    Quote Originally Posted by jelo View Post
    I had a quick glimpse, didn't concentrate on the battery connection, why?
    I'm trying to figure out why you claim he needs a 5kW battery.

    I agree on having a battery to stop the inverter from shutting down and starting up every time a cloud pass, but for starters I think he will go a long way with 4x105Ah lead acids to help suplement the short term peaks and valleys in the solar supply

  17. #31
    Join Date
    May 2009
    Location
    Hillcrest
    Age
    65
    Posts
    19,733
    Thanked: 9282

    Default Re: Not grid tied, solar when the sun shines

    Quote Originally Posted by faniedup View Post
    I'm trying to figure out why you claim he needs a 5kW battery.

    I agree on having a battery to stop the inverter from shutting down and starting up every time a cloud pass, but for starters I think he will go a long way with 4x105Ah lead acids to help suplement the short term peaks and valleys in the solar supply
    Exactly. Would be perfect for this application.

    The danger, and why some suppliers wont even sell to you unless you can guarantee otherwise, is that somebody who doesn't know better, tries to draw 5kW out of the inverter while on batteries, and sucks 100A out of the batteries and kills then in a week..
    Cheers

    ZS5KAD - PROFFESIONAL DUMBASS
    3 Land Rover V8's
    NA - TwinTurbo - SuperCharged
    A V6 and an inline 4

    If you fly or drive to an anti-Fracking meeting, you have no business being there and you wont get my ear......

  18. #32
    Join Date
    Mar 2008
    Location
    De Wildt
    Age
    58
    Posts
    42,457
    Thanked: 19480

    Default Re: Not grid tied, solar when the sun shines

    Quote Originally Posted by faniedup View Post
    I'm trying to figure out why you claim he needs a 5kW battery.

    I agree on having a battery to stop the inverter from shutting down and starting up every time a cloud pass, but for starters I think he will go a long way with 4x105Ah lead acids to help suplement the short term peaks and valleys in the solar supply
    I didn't say he needs a 5kW battery, but as Fluffy said: if his draw is 4-5kW PER HOUR for several hours......

    Watt-hours = Amp-hours * Volts

    Amp-hours * Volts = Watt-hours

    1 x 105 Ah battery = 105*12 = 1.26kWh ...........

    BUT

    you can't discharge a conventional battery that way.

    I know NOTHING about battery sizing, and I haven't checked the VDC input requirements for the inverter in question, but I still say you'd need a bunch of very expensive LA batteries or some very expensive Pylon lithiums.......
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

  19. #33
    Join Date
    Oct 2013
    Location
    Centurion
    Age
    64
    Posts
    2,693
    Thanked: 1107

    Default Re: Not grid tied, solar when the sun shines

    Quote Originally Posted by Die Uwe View Post
    Just to add. The pump and the geyser dont have to run at the same time. I dont plan on pumping water out of the ground for 6 hours a day.
    How many hours will the pump run per day?

    That will sort out what size and type of battery.

  20. The Following User Says Thank You to ekkekan For This Useful Post:


  21. #34
    Join Date
    May 2009
    Location
    Hillcrest
    Age
    65
    Posts
    19,733
    Thanked: 9282

    Default Re: Not grid tied, solar when the sun shines

    Quote Originally Posted by ekkekan View Post
    How many hours will the pump run per day?

    That will sort out what size and type of battery.
    I think in a case like this the batteries should be set to never supply the load unless there is a power failure.

    Their primary function is to make the job of the Inverter easy during glitches.

    So the smallest battery you can get away with floating forever. Probably 4 x 100AH Deep Cycles.

    In this way you maximise the use of PV energy when it is available, use mains when there is no PV because it is cheaper tha cycling batteries, and have a more than decent UPS for load shedding etc.
    Cheers

    ZS5KAD - PROFFESIONAL DUMBASS
    3 Land Rover V8's
    NA - TwinTurbo - SuperCharged
    A V6 and an inline 4

    If you fly or drive to an anti-Fracking meeting, you have no business being there and you wont get my ear......

  22. #35
    Join Date
    Oct 2013
    Location
    Centurion
    Age
    64
    Posts
    2,693
    Thanked: 1107

    Default Re: Not grid tied, solar when the sun shines

    Quote Originally Posted by Fluffy View Post

    So the smallest battery you can get away with floating forever. Probably 4 x 100AH Deep Cycles.

    In this way you maximise the use of PV energy when it is available, use mains when there is no PV because it is cheaper tha cycling batteries, and have a more than decent UPS for load shedding etc.
    Those 4x100Ah seems OK when there is enough PV and only used for starting. My time in hours is based on the days with no sun and OP wants to work even when no grid is available. One would not want to use a too small bank and have to replace 3 months later. Once the bank size is known one can look at PV size.

  23. #36
    Join Date
    Jul 2017
    Location
    Karoo
    Posts
    306
    Thanked: 637

    Default Re: Not grid tied, solar when the sun shines

    Thanks for the input thus far. On days of no sun I will not run the borehole pump and will use the gas geyser in the other bathroom.

    I believe a bit of compromise will be needed on my side with a setup like this, and im fine with that.

    The plan is to only use the solar setup when it can produce enough electricity.

    If however you say that entry level batteries will cost R10k for the 4 x 100ah lead acid and I can get better batteries for R20k. Then I will rather just get the better batteries from the get go.
    Triton 3.2 Auto 4x4
    Qashqai 2.0 2+

  24. #37
    Join Date
    Mar 2008
    Location
    De Wildt
    Age
    58
    Posts
    42,457
    Thanked: 19480

    Default Re: Not grid tied, solar when the sun shines

    Quote Originally Posted by Fluffy View Post
    I think in a case like this the batteries should be set to never supply the load unless there is a power failure.

    Their primary function is to make the job of the Inverter easy during glitches.

    So the smallest battery you can get away with floating forever. Probably 4 x 100AH Deep Cycles.

    In this way you maximise the use of PV energy when it is available, use mains when there is no PV because it is cheaper tha cycling batteries, and have a more than decent UPS for load shedding etc.
    He DOESN'T want grid tie
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

Page 2 of 2 FirstFirst 1 2

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
  •