The power demand imposed on it by the equipment that the inverter operates on
  Currently, the only source of new nickel-iron batteries appears to be Hungary, and we've heard mixed reports about them. In short, we don't recommend them unless they're almost free. High losses in charging and discharging will increase the size of solar panels required for the same energy usage by 25-40%. Advantages – Switching time is lower than offline UPS 2) Internal...
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