Electrochemical storage system comprising a multi cell-array with [2,n] cells electrically connected in series, each cell comprising a membrane, a first cell compartment and a second cell compartment, and electrolytes, at least one Hydroxyl Storage Electrode (HSE) with at least one appendant Hydrogen Evolution Electrode (HEE) together forming a negative electrode, at least one Oxygen Evolution Electrode (OEE) forming a positive electrode, at least one first electrical connection to the positive electrode and at least one fourth electrical connection to the negative electrode, wherein the fourth electrical connection at the cell side is split into a fifth electrical connection to the at least one HSE and a sixth electrical connection to the at least one HEE, wherein the negative electrode of cell m is in electrical connection to the positive electrode of cell m+1, wherein hydrogen evolution (i HE ) currents between HSE i and HEE i (i∈[1,n]) are independently controlled with at least one controller, wherein electrical connections provide a multi-triggered electrode, and wherein the at least one first electrical connection of the first cell is adapted to be electrically connected to a first terminal of an external DC power source/sink and wherein the at least one fourth electrical connection of the last (n th ) cell is adapted to be electrically connected to a second terminal of the DC power source/sink. a multi cell-array with [2,n] cells electrically connected in series, each cell comprising a membrane, a first cell compartment and a second cell compartment, and electrolytes, at least one Hydroxyl Storage Electrode (HSE) with at least one appendant Hydrogen Evolution Electrode (HEE) together forming a negative electrode, at least one Oxygen Evolution Electrode (OEE) forming a positive electrode, at least one first electrical connection to the positive electrode and at least one fourth electrical connection to the negative electrode, wherein the fourth electrical connection at the cell side is split into a fifth electrical connection to the at least one HSE and a sixth electrical connection to the at least one HEE, wherein the negative electrode of cell m is in electrical connection to the positive electrode of cell m+1, wherein hydrogen evolution (i HE ) currents between HSE i and HEE i (i∈[1,n]) are independently controlled with at least one controller, wherein electrical connections provide a multi-triggered electrode, and each cell comprising a membrane, a first cell compartment and a second cell compartment, and electrolytes, at least one Hydroxyl Storage Electrode (HSE) with at least one appendant Hydrogen Evolution Electrode (HEE) together forming a negative electrode, at least one Oxygen Evolution Electrode (OEE) forming a positive electrode, at least one first electrical connection to the positive electrode and at least one fourth electrical connection to the negative electrode, wherein the fourth electrical connection at the cell side is split into a fifth electrical connection to the at least one HSE and a sixth electrical connection to the at least one HEE, wherein the negative electrode of cell m is in electrical connection to the positive electrode of cell m+1, wherein hydrogen evolution (i HE ) currents between HSE i and HEE i (i∈[1,n]) are independently controlled with at least one controller, wherein electrical connections provide a multi-triggered electrode, and wherein the at least one first electrical connection of the first cell is adapted to be electrically connected to a first terminal of an external DC power source/sink and wherein the at least one fourth electrical connection of the last (n th ) cell is adapted to be electrically connected to a second terminal of the DC power source/sink. <EOS>