The lecture will cover our recent research in the Swedish Consortium for Artificial Photosynthesis and the European network SOLAR-H. Our research aims for the production of a valuable fuel, hydrogen, from the endless resources solar energy and water. The idea is that water shall be oxidized in a molecular, catalytic process using solar energy. The electrons extracted from water shall be used in a second catalytic process to reduce protons to molecular hydrogen. To manage our chemistry we use a biomimetic approach where we copy key principles from natural enzymes that accomplish partial reactions. Water oxidation using solar energy is carried out by the Photosystem II reaction center using a catalytic Mn4 complex. In our chemistry we use a photoactive ruthenium center to absorb light energy and trigger the electron transfer reactions. This photoactive Ru-center is coupled synthetically to synthetic multinuclear manganese-complexes. The lecture will describe our research on light driven, multi-electron transfer in these Ru-Mn systems. Recent chemical oxidation experiments that lead to the oxidation of water in synthetic Mn-systems, will also be described and analyzed with a combination of EPR spectroscopy and isotope-labeling techniques. To accomplish reduction of protons to hydrogen we mimic the di-iron center in hydrogenase enzymes. Some of our recent results on these biomimetic Fe-Fe complexes will be described.