I checked with vmpp voltage it was around 14.9V for 21V oc voltage.
As you are not running the mosfet up anywhere near its maximum rated current, 11v gate drive should be fine.The voltage doubler circuit i am using provides around 11V to turn on mosfet and people who have worked with such drivers seem to have satisfactory results.
At 100% duty cycle solar voltage=16V battery voltage=15.5V
Actually this thing would have got over long back but, i see that vmpp what i have set isn't working fine below 17.5V i.e say in algorithm i set vmpp=14V,15V,16V it just sits at 17.76V but, system works properly for vmpp above 17.5 till open circuit voltage.
I am powering the mosfet driver circuit (i.e voltage doubler +tlp250 ) from battery voltage not solar.The only other thing I can think of is, where does the control system take its power from. Is it from the battery side, or from the solar panel side ?
I see that vmpp what i have set isn't working fine below 17.5V i.e say in algorithm i set vmpp=14V,15V,16V it just sits at 17.76V but, system works properly for vmpp above 17.5 till open circuit voltage.
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