Solar-bicycle project. Charge controller and inverter questions
I run a community garden in San Jose and we are installing an off the grid solar system to power a few appliances: 2 Led lights (20W) + phone charger (6W) + immersion heater (120W)
We will start there and eventually expand the system to generate enough power for a small 12V van-type fridge. Someone suggested to keep the system 12V to avoid any possible safety issues.
Our max energy use per day would be 200W, although this is not likely to happen often, or at all. The garden is not open everyday and the appliances would not necessarily be used every time the garden is open. This would change once we incorporate the fridge, but that is a future concern.
The fun part of the project is that we are going to build a bicycle blender (only mechanical) and add a second chain to the rear that will tie to an alternator to provide extra energy to the battery.
What I am wondering is what type of charge controller would we need? I imagine we would need 2 inputs to draw power from the alternator and the solar panel.
In case this helps, we were thinking of getting 2x250W solar panels and 2x1200W deep cycle batteries (12V). And just to make sure, since it's a 12V system, there is no need for an inverter right?
Any input or ideas would be appreciated!
Thank you :)