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  • Small off-grid systems for offices

    Hello, my name is Philip. I am an American working as a marketing director in Shanghai for a Chinese on/off grid products distribution company. I have learned a lot about my company's products in a very short time, but I feel as though I still don't know enough. In order to become more knowledgeable about the products that I am selling, I am thinking about installing a small off grid 380W system in a friend's office here in Shanghai. I plan to hang the two 190W mono panels in the windows much like a BIPV. The rest of the equipment will be as follows:

    -Inverter: 220V, 50HZ, 300W
    -2 batteries: 12V, 150AH
    -Controller: 24V DC, 0.4KW

    I would like to run sockets directly from the system and plug in 8 computers, 2 water coolers, and a microwave.

    Is this possible? Does anyone see any potential problems?

    Best,
    Phil

  • #2
    Originally posted by baronclaw View Post
    -Inverter: 220V, 50HZ, 300W
    -2 batteries: 12V, 150AH
    -Controller: 24V DC, 0.4KW

    I would like to run sockets directly from the system and plug in 8 computers, 2 water coolers, and a microwave.

    Is this possible? Does anyone see any potential problems?
    You are correct, you have a lot to learn. The batteries will be destroyed in an hour after they come in the morning. Nothing you have specified can even run a single computer.

    Try something more like:

    Panel Wattage = 3000 watts
    60 Amp MPPT controller
    48 volt Battery @ 600 AH
    5 Kwh True Sine Wave Inverter.

    You are not even close.
    MSEE, PE

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    • #3
      small off-grid solar system

      Originally posted by Sunking View Post
      You are correct, you have a lot to learn. The batteries will be destroyed in an hour after they come in the morning. Nothing you have specified can even run a single computer.

      Try something more like:

      Panel Wattage = 3000 watts
      60 Amp MPPT controller
      48 volt Battery @ 600 AH
      5 Kwh True Sine Wave Inverter.

      You are not even close.
      Okay, so let me pick your brains for a moment. 3000 watts for the panels. Is this number based on the sum of the peak wattage of all panels in the system? For instance, if I have 11 x 290w panels, that should do the trick right? As for the other figures that you mentioned, is there a formula that you used or are you basing your numbers on past experience? Also, can you explain "the batteries will be destroyed." If I were to use the incorrect figures that I mentioned in my last post, are you saying that the load would be too great? How would the batteries be destroyed?

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