hi,
I'm designing a DIY emergency light for some places in my house as I have quite a lot of power problems here, anyway, I was thinking, can some one help me out with the following questions regarding batteries:
1. I was thinking of getting the 12v 4aH battery, **broken link removed** at rapid. Does it mean I can run a 12 halogen 20w light bulb for 4 hours or whatever? what is the maths? it says it can supply 200ma for 20 hours, does that mean I can get 1amp for 2 hours or something?
2. what kind of rated relays do I need to make sure it can handle the current from these batteries?
3. what kind of charging circuit do I need to charge these from a +12v 400ma powerpack? would that mean it takes 10 hours to fully charge?
4. I assume that a 10w halogen light would use half that power/have double the time...
5. what are suitable 'tab' connectors? any part numbers?
thanks for your time,
computer
ps: incase you are wondering I am using a simple relay controlled by a microcontroller to run it....
I'm designing a DIY emergency light for some places in my house as I have quite a lot of power problems here, anyway, I was thinking, can some one help me out with the following questions regarding batteries:
1. I was thinking of getting the 12v 4aH battery, **broken link removed** at rapid. Does it mean I can run a 12 halogen 20w light bulb for 4 hours or whatever? what is the maths? it says it can supply 200ma for 20 hours, does that mean I can get 1amp for 2 hours or something?
2. what kind of rated relays do I need to make sure it can handle the current from these batteries?
3. what kind of charging circuit do I need to charge these from a +12v 400ma powerpack? would that mean it takes 10 hours to fully charge?
4. I assume that a 10w halogen light would use half that power/have double the time...
5. what are suitable 'tab' connectors? any part numbers?
thanks for your time,
computer
ps: incase you are wondering I am using a simple relay controlled by a microcontroller to run it....