For blueint: It really seems like we are on the right track of finding the right solution... The problem is now that the fuell cell delivers 1 kW and both the buck-boost and the flyback can only handle up to 150 W. I do not know if this is the same case for the Sepic and the Cuk... What difference d...

For blueint: The fuell cell produces between 3 A at 30 V and 70 A at 30V depending on the current drawn from it. I need to charge 2 12 V batteries with this fuell cell... I have no system setup right now... that is what im hoping to build on the basis of the help im getting here...

Ok... On the links you (victor_passe) gave me there is a load of switching regulators and i have quite a problem of finding out which one to use... Do i have to be worried about frying the regulator at 70 A?

For Victor_passe: Is that also what is called a "inverting regulator?" For dar303: I have already tried to search the web for that solution. I (think) i found out that a charging regulator for a small wind turbine for use on boat or other places, could only receive 12, 24, 36 or 48 volts, ...

Hi everybody. Im danish, but writing you in english since my swedish is a little poor and to avoid confusion. Im currently working on a projekt conserning fuell cells... My problem is that depending on the working load drawn from the fuell cell stack, the current is varying from about 3 A and 30 V t...