Hello everybody, Im doing a project and I need to supply my arduino with solar power, I know I can use a battery and a module to do that, but my question is, can I have for example two batterys? one supplying the arduino while the other battery is getting charge with solar power? then when the first battery is low change to the other battery and start charging the first battery with solar power?
Thanks
HI,
Why can't you charge and use the battery at the same time?
If you look for solar charge controllers, charging and supplying to a load while charging is not a problem.
Can you post links to what solar charge modules you have been looking at?
Tom.. 
Size the system so that the solar cells provide current to charge the battery and current to run the project during daylight hours.
And remember that the solar cell output and battery capacity numbers are wildly optimistic (or complete lies). After you figure out your power needs multiply by 3 or 4 and use that number to pick parts.
hi, thanks for answering I was looking at this one Solar Power Manager 5V - DFRobot
Im making a scada system with arduino, and I need the arduino to be working all the time, so do you think this could work?
I dont know which batterys should I use.
You need load sharing for that (where the solar panel can simultaneously charge the battery and power the Arduino).
Most solar LiPo charger hobby modules can't do that. Instead, they can charge the battery properly only if it is disconnected from the load.
For better advice, post the details of your application.
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