Reolink solar panel
You can keep the camera charged with the solar panel that can be connected via the USB port.
Here in Florida, the panel works very well because it's the sunshine state 
https://learncctv.com/
Note :
"Reolink solar panel"This content is uploaded by APPS CONNECT Developer and available on Google Play Store. APPS CONNECT Developer do not own this content and this content credits to their respective owners listed in the source link. Hopefully useful and please share this app.