I have finally built my Arduino Weather station. I thought it might be good to power it by battery, and recharge the battery by Solar Panel. My main problem is i live in the centre of England, and the average sun shine hours are very poor especially in Winter.
My question is this, Can i power the Arduino during daytime hours from a 9 volt dc transformer, fed from my houses 240 vac mains supply, while the Solar Charger re charges the battery, then when the light levels drop, some kind of automatic switching devise will switch off the transformer supply onto the battery supply, then visa versa when the light levels rise again. I also intend to build a solar tracker to obtain maximum sunlight collection.
I have had an idea to use the 9 volt transformer connected to the Arduino external power supply, and the battery connected to the USB port, if this is possible, any advise would be appreciated, as i do not want to fry my equipment.
Can anyone advise on this