Considering the high current carrying capacity of the TEC module is high therefore we cannot use battery it will be bigger than the Product. Therefore second method is used to generate the electricity is by heating the Heat sink to temperature and maintain the temperature same as hot side heat sink temperature so that electrons inside the semiconductor excites and generate the electricity which is method to other than supplying electricity to TEC module.
From Figure 8, it can be seen that the retention time is around 52 min which can be