I bit the bullet, panels etc to be delivered on Monday - Page 4




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  1. #61
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    Default Re: I bit the bullet, panels etc to be delivered on Monday

    They're probably all busy but anyone know of someone in Cape Town who is good at installing these systems?

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  2. #62
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    Default Re: I bit the bullet, panels etc to be delivered on Monday

    Quote Originally Posted by Dogbert View Post
    They're probably all busy but anyone know of someone in Cape Town who is good at installing these systems?
    Got a mate who's done his fair share...

    http://vickerselectrical.co.za/
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  4. #63
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    Default Re: I bit the bullet, panels etc to be delivered on Monday

    Quote Originally Posted by Mbu View Post
    I could be wrong but your PC array is way over the limit for your mppt. I have a similar size schubart inverter and for a 48v system the limit is around 3000w and you are over 5000w .
    Mbu

    Care to explain? I am a bit slow on the uptake.
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  5. #64
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    Default Re: I bit the bullet, panels etc to be delivered on Monday

    Just an update.

    Elect drawn from Eskom over three months, reading every 18th
    - Dec : 702 kWh
    - Jan : 701 kWh
    - Feb : 762 kWh (We had quite a few overcast days due to the good rains, hence the increase)

    The above was attained via a timer system to change to Eskom that I set to specific periods of the day, with intermittent changes on overcast stages.

    But now all has changed

    Richard Mackay has built and installed a DCV monitor and switchover that works perfect.
    - Switch to Eskom at 44V
    - Switch back to batt at 55V (after 1.5 - 2h)
    - Switching to Eskom usually around 6AM when the shop fridges start up and switch off around 7AM. This is usually a balancing act as when the sun is a bit late to hit the panels a short switchback happens. In the evenings around 7PM the switch to Eskom happens again until the batteries are charged and due to very low draw during the night the batteries last to 6AM again. I like!

    I can already see less Eskom hours are being used. kWh are also being logged to get a more accurate figure in a month's time
    Isuzu 300 d-tec
    MB Gwagen G350 Bluetec
    Nissan NP300 2.4 4x4
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  7. #65
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    Default Re: I bit the bullet, panels etc to be delivered on Monday

    Quote Originally Posted by JohanMaree View Post
    Mbu

    Care to explain? I am a bit slow on the uptake.
    there is a maximun limit of the total watts from the pv panels that can be handled by one particular mppt and it is usually reflected on the specs of the mppt .for eg a 60 A 150v mppt will allow a maximum input of 3000w from the solar panels for a 48v battery bank . the limit is even lower if it's a 24v battery bank system for the same mppt size it's usually around 1600w.I know we dont get the full documented wattage from the panels but it's usually safe to keep within the manufacturer's recommended limit to avoid damaging your mppt

  8. #66
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    Default Re: I bit the bullet, panels etc to be delivered on Monday

    Would the MPPT or PWM not just limit the current to the maxim. I have found cheap PWM would switch of the solar input at 90% of maxim and not switch on again until solar disconnected and reconnected. This may be a good point to consider while we exceed the maxim to take care of cloud and partial shade.

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

    Mbu

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