how much does it cost???

[jasonnjane]

how much does it cost to charge a rc car battery?

always wondered this.

[pugs]

not much, if you are charging off a modern switch mode power supply the current draw on the mains side is going to be very low, maybe about 20-40 watts at the most I would have thought(unless you are running at its max current draw), electricity is measured in Kw hours,so you can draw 1Kw(1000 watts) for 1 hour and you will be charged 1 unit of electricity for this (not sure how much it is per unit now) but if you know then you can roughly work it out now

[purpletimbo]

Nothing as I always charge off my full size car, and the extra fuel to recharge it's battery must be too small to measure.

[ashleyb4]

Well Going on the basis that electricty is say somewhere about 5p a unit?

I charge my 5000 mah lipo at 5 amp

13.8v x 5 = 69Watts

Now in theory it should take an hour at 5 amp to put 5000 mah into the cell im sure its not but i aint arguing so thats 69wh > 0.069

Somwhere about 0.3 of a penny.

God ive got to much time on my hands.

A

[pugs]

Originally Posted by ashleyb4

Well Going on the basis that electricty is say somewhere about 5p a unit?

I charge my 5000 mah lipo at 5 amp

13.8v x 5 = 69Watts

Now in theory it should take an hour at 5 amp to put 5000 mah into the cell im sure its not but i aint arguing so thats 69wh > 0.069

Somwhere about 0.3 of a penny.

God ive got to much time on my hands.

A

Thats how many watts you are pulling from the 12v side not the 240v side

[ashleyb4]

Yea but omhs law! As voltage goes down aka the transformer the current goes up. TO make the power the same.

A

[pugs]

Originally Posted by ashleyb4

Yea but omhs law! As voltage goes down aka the transformer the current goes up. TO make the power the same.

A

No sorry it's not the same, if you pull 20amp from a 20 amp power supply it will not pull 20amp from the 240v end, more like 3-5amp, think about it you normally only get a 13amp fuse,trust me I've been an electronics engineer for 16 years. You are right that as the voltage goes down the transformer current goes up but it's the conversion between the two coils, the current draw on the 12v side is at say 20amp(max load) the load is a lot less on the other side because the voltage is a lot higher and if you go into switch mode power supply's it's even more complex