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Elettrical mppt with high voltage input and wide voltage input @ costant vout

Hi there... I'm developing a mppt to drive a big inverter. Vin is from a lot of solar panels in series to produce about 730 vdc (900 with no load) but when the vin is higher of about 400 vdc the mppt Will start up and drive it to 600vdc and when the vdc Will be over 600 it must regulate it to 600 with constant  Vout....

I know that means its not a mppt the right name, but We started to call it so.... :) any ideas? Iout max @ 12 amps...

i Was thinking to power an arduino, to measure the vdc in and to drive a buck boost converter... I reached to power on the arduino and to measure the vdc in... Now the problem is the real problem... Ive surfed the web but i didn't found anything... Thanks a lot for any ideas... MM

p.s dc dc converter is not my passion, ive started to study but the voltage is really high... Regards