Solar heat collection efficiency reduces with increase in temperature of the heating media owing to heat loss. Thermal energy capture is easily carried out using heat exchangers, but there are challenges in converting this to usable power, especially at lower temperatures. An electrochemical system which has reasonable variation in free energy with temperature can be used to capture this low grade energy by charging at a higher temperature. Vanadium Redox Flow Battery (VRFB) is considered as a case study to see the feasibility of this concept. For this purpose, a lumped parameter model of the VRFB system is developed to study the high temperature operation. It is observed that high temperature operation enables charging at lower potentials and achieving higher current density. Based on this study a method for capturing low grade energy using electrochemical systems is investigated. © 2018 Elsevier B.V.