Solar power

Discussion in 'Power cuts' started by Criggy, 7 Mar 2015.

  1. Criggy

    Criggy

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    My tank is now completely off the grid
    All it took was a 300w 24v solar panel, a charge controller, 2 12v lead crystal batteries and a 2.2kw 24v true sinewave inverter.
    Thanks eskom...but no thanks

    Powers tank, all the lights in my house and most plug points except for kettle, oven, toaster, geyser etc uploadfromtaptalk1425737195853.jpg

    uploadfromtaptalk1425737195853.jpg
     
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  3. dallasg

    dallasg Moderator MASA Contributor

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    Cool, what aH batteries? Remember not to discharge them to low and a good investment is a battery monitor
     
  4. Criggy

    Criggy Thread Starter

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    100ah x2. They lead crystal so can be drained dead and will not affect them. Tonight will be the test..hold thumbs!!
     
  5. mariusmeyer

    mariusmeyer

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    Only a 300w panel?
     
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  6. dallasg

    dallasg Moderator MASA Contributor

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    Panel only charges battery, so 300w should be fine
     
  7. dallasg

    dallasg Moderator MASA Contributor

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    Lead crystal are best for solar and varied climates, have about 3000 disharge/recharge cycles
     
  8. butcherman

    butcherman Moderator MASA Contributor

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    What is the power consumption for your tank?
     
  9. Riaanv

    Riaanv

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    Not sure how far you will get on 300w for most tanks (not an expert) but 300w x 5.5 hours sun a day will give you 1.65 units (KWH) per day (in winter you can half this). Those batteries should work well for load shedding

    My tank needs 24 units (KWH) a day, I will need 4300w worth of panels. In winter it will only cover half of the 24 units required per day.

    If my calculations are wrong I would be happily corrected because it would mean what I am planning will give more units / be much cheaper..........
     
  10. dallasg

    dallasg Moderator MASA Contributor

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    As far as my techs tell me the panels charge the batteries via the charge controller, the batteries thru the inverter power the tank

    I will post a diy tut during the week
     
  11. Criggy

    Criggy Thread Starter

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    i may need to add another 300w panel. The tank consumption is at min 160w and at max 660w if lights are on and heater is on which in summer- heater is never and lights are on 7hrs p/day. i averaged it out to approx 300w. If it is not sufficient i will add 1 more 300w panel. lastnight i was at the rugby and when i got home the inverter had switched off but the charge in the batteries was still 24v. Will be at home toniht to do a test on the batteries and if they do not run the tank throughout the night i will add another 2 batteries. Im currently getting an avg of 280w from the panel. Will need to see what this drops to in cloudy conditions/shortened daytime etc. Will be interesting to see how jt turns out.
     
  12. BennieV

    BennieV

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    Hi Criggy what did you spend so far on your solar system.
     
  13. Criggy

    Criggy Thread Starter

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    18k so far. All high end equipment though and allows for easy upgrading and additions.
     
  14. TaahirS

    TaahirS MASA Contributor

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    How often do the batteries need replacing? And how much do they cost?
     
  15. Criggy

    Criggy Thread Starter

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    Should last 8-10 years and range btwn 2-3k depending on size and quality. A nice way to keep your tank running in the event of loadsheddung is to get 1 decent battery and a 1kw inverter which should handle a 3hour loadshed. If you need power for longer then add batteries
     
  16. mpcheshire

    mpcheshire

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    Where did you buy the solar equipment from? Pricing seems good
     
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  17. Riaanv

    Riaanv

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    Thanks Dallas would appreciate that
     
  18. zippy

    zippy

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    very interesting.
     
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