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I have built a wind generator capable of 54vdc @ 6.4 amps open circuit. How do I control the power into the grid tied inverter with a min of 11vdc to a max input of 32vdc. I do not want to dump power into a bank of resistors. Id like to be able to make a circuit maybe with relays that will switch when the power gets too high and decrease the voltage and increase the current. Or do I just use a deep cycle battery (with a low voltage cut off when the generator isn't running), in between to keep the voltage steady as it will not over charge due to the constant draining from the inverter. Will a 12v battery with roughly 50 cranking amps be hurt by charging voltages between 12 and 50 volts with max 6.4 amps. Again, it will never get that high due to the inverters draw, id be using it to maintain steady power to the inverter. What are the flaws in my reasoning?
And got the following answer:
You need a appropiately spec'ed MPPT Charge Controler between your wind turbine & your battery - with you grid tie as the load. Batteries are a great place to dump power BUT once they are full overcharging can damage them, as will over discharging them.. hence the need for a charge controler. The 'MPPT' is a typically a buck converter that does dc-dc conversion of dropping voltage while raising current. There are also boost converter that do the opposite. Your reasoning flaw is that batteries must be treated especially nice to retain their power storage capacity... they are prima donnas. So sometimes it's just easier to dump excess power then get involved with battery storage.
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