Dear all, i am possible to do experiment on the application of solar cell and i have run into several problems so i need to seek advice from all the experts in here. I have several DC loads include: 1 x Cooler fan (12V, 0.25A) 1 x cooler fan (12V, 0.2A) 2 x rechargable AA size battery (each 1.2V 0.20mA) 1 x handphone (the charger of the phone reads output to be DC 5.3V and 0.4mA) The spec of the solar.. under sunlight the voltage reading is around 22-23V and current around 0.25A. I cut the wire of the charger and attached it to the solar cell and try to charge the phone. The phone reads charging but after 5 secs it says stopped charging. May i know what is wrong? will a DC to DC converter solve this problem? But the best DC to DC converter that i can find from supplier the output is 5V and 1A. Will it still works? My next question will be if i will to do connection to the 2 cooler fan, will it be better if i connect it in parallel or series? Is it possible to do multiple connections with the above DC loads? Do you all think that it will be possible to connect the solar cell in series with any one of the cooler fan, the 2 AA size battery and then to the handphone in series? Any recommendations on how should i connect if i want to do multipe connections? Thank you for your time in reading my questions and offering your help. So sorry, i lack knowledge in such stuffs but was allocated this project thus very desperate for help with experts in this forums. Thank you so much everyone. Really appreciate it.