Polyethylene glycol-based colloidal electrode via water
(B) Using the photovoltaic solar panel with an 8 V output voltage to directly power a 10 V LED panel. (C) Using the photovoltaic solar panel with a 9.14 V output to charge the batteries in parallel. (D–F) Photovoltaic solar panel-charged 12 V LED panel during daytime (E) and at night (F).