Hi everyone, I know similar questions have been asked on the forum before but, differently from other topics, I am going to turn on a high-power LED trying to use the smallest amount of solar cells for weight and space constraints reasons.
I have saved four small high efficiency solar panels and a 18650 Li-ion battery from two power banks and I would like to power a small sailboat crepuscular navigation lights using solar energy.
The light uses a 3W 700mAh (2-3V) white LED which will be turned on and off using a LDR. Solar panels produce 5V 100mA, so an array of four would give out 400mAh, still less than what the LED requires.
The wiring possibilities include: - TP4056 and a boost converter (XL6009 for instance); - the new TPxx board (see pic below); - a Mppt Controller J3L2 (see pic below); - a IC QX5252F based circuit (as described here) - a direct connection from the panel to the battery and a switch activated by on the LDR to cut off solar panels and connect the battery to the light.
Which approach do you think works best? Should I add more solar panels and batteries? Thank you