Patent ID: 8230736

Claim:
A flow battery, comprising: a first holding tank for holding a first conductive electrolyte; a second holding tank for holding a second conductive electrolyte; at least one cell through which the first conductive electrolyte and the second conductive electrolyte are flowed; a first level sensor positioned in the first holding tank; a second level sensor positioned in the second holding tank and decoupled from the first level sensor, wherein said first and second level sensors are arranged such that there is no potential for cross-talk between the first and second level sensors; and circuitry coupled to the first level sensor and the second level sensor to alternatingly determine a liquid level in each of the first holding tank and the second holding tank, wherein the first level sensor and the second level sensor each comprise: at least two electrodes, the two electrodes being positioned in the holding tank; and sensor leads that couple the at least two electrodes to the circuit.