[Swansea Hackspace] Solar Panel Battery Charging

[Ceri Clatworthy]

Assuming you only need 3V3, then you could just charge an 18650 LiPo with
Resistor & Diode directly from solar panel,

*Yes I know it is not the best solution, but if the solar panel is about
the right 'power' O/P then it should be OK,*
*After all, that's how MOST solar security lights work.*


Assuming you are using something like a D1 mini, then you can probably just
connect the LiPo directly across it's 5V input.




On Fri, Jul 17, 2020 at 2:54 PM E Ball <eba at ebassociates.co.uk> wrote:

> Thanks il check your answer out - I am using Arduino UNO Wi-fi Rev 2
>
> Regards
>
>
>
> Eddie Ball
>
> EBA Consulting Ltd
>
> +44(0)7767426142 <+447767426142>
>
> +44(0)1554890300 <+441554890300>
>
>
>
> Visit Our Web Site <http://www.ebassociates.co.uk>
>
>
>
> [image: Twitter_logo 1] <https://twitter.com/#!/eddieballeba>[image:
> Facebook]
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> Sent from my iPhone
>
> On 17 Jul 2020, at 14:31, Alice Mitchell <alice at swansea.hackspace.org.uk>
> wrote:
>
> On Fri, 2020-07-17 at 09:38 +0000, EBA Consulting Ltd wrote:
>
> Hi
>
>
>
> I have designed a system with 3 sensors (Temp,Light and level) they
>
> run from an Arduino- wifi unit. I have powered it using a 9v PP3
>
> battery.
>
>
>
> The system will be located outside the property but in range of wi-
>
> fi.  There is no power so I would like to use a re-chargeable 9v
>
> battery connected to a solar panel to keep it topped up.
>
>
>
> I am looking for help to provide a hardware design solution to
>
> achieve this
>
>
> I would be curious to know what Arduino board you are using, a lot of
> the standard ones used a linear voltage regulator for the power supply
> which will waste a lot of power and might make the power consumption
> too high to be practical for long term solar power.
>
> Have you seen projects like this one ?
> https://www.instructables.com/id/Solar-Powered-WiFi-Weather-Station-V20/
>
> They use a Wemos D1 Mini as the microcontroller (its an ESP8266 dev
> board), powered by a standard LiIon battery, connected to one of those
> off the shelf lithium charging boards like we stock in the space and a
> solar panel.
>
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