So I want to learn about batteries and the process of charging them.
As a project, I'm going to create a solar powered charger to charge a 9v NiMh battery with 175mah capacity.
I have a 15v solar panel which produces 0.32A of current. I will use this to charge my battery.
So here are my questions:
I read somewhere on the net that you should not charge a battery with a higher voltage than its capacity. So if I was to just connect the panel to the 9v battery, while it's generating 15v - boooooooom? I should use a 9v voltage regulator, right?
I also saw something on the net about only charging batteries with 10% of their current. Is this true? Should I be resisting my current to 17.5mah (for a 175mah battery)? If so, why?
15v is the peak voltage of the solar panel. It won't always be at this rate. Infact, it may even be lower than 9v. Does this mean that if the current battery charge produces more power than the solar panels, the charge will actually travel in the wrong direction and damage my panels? Should I be using a diode and/or something else to prevent this?
How do I work out the amount of hours required to fully charge the battery?
If something was to go wrong with this project, could I blow up my whole house and kill myself and invalidate my home insurance and make my family homeless? No seriously, is it safe?
Is there anything else I should know (saftey, good practices, etc etc)?