A modular kitchen-connected indoor stationary solar cooking device comprising: a housing; a thermal battery disposed in the housing and adapted to store thermal energy, wherein an outer surface of the thermal battery is insulated in a graded manner by a first layer of a high temperature heat resistant paint, a second layer of a reflector formed on the first layer, and a third layer of another insulation material formed on the second layer, wherein vacuum is provided between the first insulation layer, the second insulation layer, and the third insulation layer; a first heater disposed to be in contact with the thermal battery, wherein the first heater is to be coupled, in use, to a solar array, operated at a first value of electrical resistance, and adapted to receive solar energy in electrical form which is converted into heat energy for charging the thermal battery; a second heater disposed to be in contact with the thermal battery, wherein the second heater is different from the first heater and is to be coupled, in use, to a mains supply, operated at a second value of electrical resistance to draw, in use, a defined range of electrical supply from the mains supply for charging the thermal battery; wherein, the first heater and the second heater are adapted to: separately receive the solar energy and the electrical supply, respectively, for simultaneously charging the thermal battery and storing the thermal energy; wherein the solar cooking device further comprises a heat control assembly disposed on a cooktop of the thermal battery and adapted to accommodate a cooking vessel, wherein the heat control assembly is adapted to rotate for controlling a heat supply for cooking in the cooking vessel, wherein the solar cooking device can get charged and discharged at the same time while performing its function of indoor cooking. a housing; a thermal battery disposed in the housing and adapted to store thermal energy, wherein an outer surface of the thermal battery is insulated in a graded manner by a first layer of a high temperature heat resistant paint, a second layer of a reflector formed on the first layer, and a third layer of another insulation material formed on the second layer, wherein vacuum is provided between the first insulation layer, the second insulation layer, and the third insulation layer; a first heater disposed to be in contact with the thermal battery, wherein the first heater is to be coupled, in use, to a solar array, operated at a first value of electrical resistance, and adapted to receive solar energy in electrical form which is converted into heat energy for charging the thermal battery; a second heater disposed to be in contact with the thermal battery, wherein the second heater is different from the first heater and is to be coupled, in use, to a mains supply, operated at a second value of electrical resistance to draw, in use, a defined range of electrical supply from the mains supply for charging the thermal battery; wherein, the first heater and the second heater are adapted to: separately receive the solar energy and the electrical supply, respectively, for simultaneously charging the thermal battery and storing the thermal energy; wherein the solar cooking device further comprises a heat control assembly disposed on a cooktop of the thermal battery and adapted to accommodate a cooking vessel, wherein the heat control assembly is adapted to rotate for controlling a heat supply for cooking in the cooking vessel, wherein the solar cooking device can get charged and discharged at the same time while performing its function of indoor cooking. separately receive the solar energy and the electrical supply, respectively, for simultaneously charging the thermal battery and storing the thermal energy; wherein the solar cooking device further comprises a heat control assembly disposed on a cooktop of the thermal battery and adapted to accommodate a cooking vessel, wherein the heat control assembly is adapted to rotate for controlling a heat supply for cooking in the cooking vessel, wherein the solar cooking device can get charged and discharged at the same time while performing its function of indoor cooking.