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Hi All.
Hopefully some one with electrical knowledge, 12 volts can give me some advice here.
Today I ran out of power with my 14 volt cordless drill, while helping our community garden, so I Heath Robinson's a old 12 volt Black and Decker Proline cordless drill, (the batteries have long been cream crackered), using blue spade connectors onto the drills terminals that would normally fit into the battery pack, using the 'orange 2 core cable' which you would normally fit to electric 'mains 'powered drills/grinders, connecting the other end to 'crocodile clips' onto the battery terminals of my fourtrak.
The drill worked, but rotation was far slower than what I expected, also the torque produced was far less than expected. My Fourtrak battery amps far exceeded the the capacity of the drills original batteries,and I was originally worried that the greater power(amps) in the Fourtrak battery would burn out the drills motor.
So any advice out there, regards cable length,type and core sizes.
Many thanks.
Edward (ews)
Quick tutorial
To quote Spike Milligan
'durr .... I writted on a piece of paperrr' http://www.daihatsu-drivers.co.uk/node/5393
Also, the amp capacity of the battery is a measure of the capability of the battery to deliver the current demanded of it. If the load only requires a smaller current, a larger battery is well capable of supplying it.
For example, if you open the vehicle door and the interior light goes on, it takes about 1/2 Amp. The battery which is capable of giving 600 Amps to start the engine does not somehow break the bulb. Put it the other way, if you installed a couple of 6V lantern batteries (capable of say 3 Amps) in series in the battery box, the interior light would still work OK because it would only need 1/2 Amp. Guess how much chance you would have of starting the engine on them, though !
The orange power tool wire is about 0.5 square millimetres, which is good for about 5 Amps. Unfortunately, as I have described, the voltage drop in a low voltage system is too great for a 12V ex-cordless drill taking about 10 Amps.
I would suggest using wire of 2.5 square millimetres cross section for a 'there and back' run of not more than 3 metres.