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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@allObjects
@etmpvga, to handle the variable output of a solar panel (assuming with no controller or a like) and the need for a steady supply of the mc, you need something in between the panel and the battery... and depending on the device you use for that, it may even have an regulated output on it, 3.3 or 5V. Don't know what mc board you have - whether it has a regulator or not...
You need to make sure that your battery is not over charged.
For once cell 1S / 18650 Lithium and solar 6V solar panel and the need of 5V, something like a 3.7V Lithium Li-ion Battery Charger Module Step Up Converter (google/ebay) works.