Solar cookers are a good option in developing countries with high solar po-tential for environmentally friendly cooking and reduced pressure on forests.However, they are still affected by the intermittency of the sun. In order toovercome this problem, in this work, a box type solar cooker integrated Ja-tropha oil as a heat storage material is fabricated and experimented with. Thedesign was examined with a maximum stagnation temperature of 157.7 ̊C.The recorded cooking power vanished between 78.4 and 103.6 W, whilethermal efficiency varied from 41.26% to 58.78%. The energy transfer cycletest, including charge and discharge revealed that 91.18% of the heat lostthrough the cooker could be recovered by the heat storage unit and a largeamount is restored to the system during cloudiness or a temperature pertur-bation

Solar Cooker, Kapok Wool, Performance, Heat Storage, Jatropha oil