Large-scale solar fuel production using semiconductor based photoelectrochemical (PEC) system requires inexpensive, efficient and stable devices that can provide photovoltages sufficient to overcome both the thermodynamic and overpotential losses of the redox reaction. Here we report all electrodeposited multi-junction PEC devices for solar fuel production using serially connected CdSe based and CdTe based Schottky barrier junctions with photovoltages exceeding 1.0 V. These PEC devices are synthesized inside nanoporous alumina membranes with each nanoscale solar conversion units physically and electronically isolated from each other, making the entire device fault tolerant. The alumina membranes also serve to protect the semiconductor from chemical and PEC corrosion.