The lithium ion battery is rated at 2000 mah.
Arduino solar panel battery.
Solar cells are connected to the input of the lithium battery charger tp4056 whose output is connected to the 18560 lithium battery.
Or by connecting the li ion battery to the solar module then the solar module to your arduino board via a pair of 5 v wires.
A 5v step up voltage booster is also connected to the battery and is used to convert from 3 7v dc to 5v dc.
The v15 v50 v75 and v88 batteries charge efficiently from solar and have an always on mode which keeps them on whether or not a device is drawing any power.
Either by connecting your arduino board to the module and the module to its solar panel.
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This circuit was based on the awesome tutorial by deba168 solar powered arduino weather station.
Solar cells are connected to the input of the lithium battery charger tp4056 whose output is connected to the 18560 lithium battery.
Charging voltage is typically around 4 2v.
Given these we must choose a solar panel capable of at least 5 7 v 164 mah and a lithium battery rated at 1044 mah.
Voltage booster s input ranges from 0 9 to 5 0v.
To be conservative my solar panel is rated at 6 v 500 mah.