fishface (31/03/2008)
dont know anything about the optimate,
but if u connect a wire wound or ceramic resistor across the output of a voltage source
( ur charger)
with a meter set to current in series between 1 end of resistor and the charger terminal this will present a known load
n u can calculate the current and compare with reading
using ohms law:
voltage ( 12v) / maximum charger current (say 2 amp) = R ( 6 ohm)
so u use a 6 ohm resistor rated at 24 w
or 12 w for a 1 amp charger
the charger shud deliver its full load current into the resistor
Did Steve Wright just take over your PC for a minute?..lol;)
lol no
im sure he would of posted sumthing a whole lot less inteligent:P
dad did the electrical knowledge and i did the knowledge of ohms law n the maths
lol yeh …i think
gcse’s seem so long ago
HNC Mech Eng seems even longer ago:D
fishface (31/03/2008)
thats cuz it was
You wasn’t even a tadpole then:D
lol i was never a tadpole , or id be a frog:w00t:
adrock (31/03/2008)
sorry couldn’t resist. not too far from the truth though, unless the battery was dodgey. would a multimeter tell you what amperage is coming out of it? maybe you could see what the trickle charge is reading at as it pulses? certainly sounds iffy. know quite a few people to have their batteries fried by optimates. won’t use em anymore.
i got mine from maplins as i’m a cheapskate. seems to work ok but i never really need to use it as i ride all year round
Most very good multimeters can only handle a current of 10 amps Max. Most not so good might have a limit of, oh, 1.50 amps. Beyond that they blow a fuse or fry some circuitry / components. So unless you can afford a sacrifical V-Ohm meter, I wouln’t do it. The cheapest way is to invest in a Battery charger that tells you what its doing at any given moment, something like an Acumen charger, got red, blue, amber and green LEDs that tell you if the battery is hosed, won’t hold a charge, or if it can be recovered, or when it is maxed out. Or you can just go out into your garage, get high on your recreational drug of choice and watch the free light show. Thats the truth, unless your battery is cheaper than the charger.
Tinker (01/04/2008)
adrock (31/03/2008)
sorry couldn’t resist. not too far from the truth though, unless the battery was dodgey. would a multimeter tell you what amperage is coming out of it? maybe you could see what the trickle charge is reading at as it pulses? certainly sounds iffy. know quite a few people to have their batteries fried by optimates. won’t use em anymore.
i got mine from maplins as i’m a cheapskate. seems to work ok but i never really need to use it as i ride all year round
Most very good multimeters can only handle a current of 10 amps Max. Most not so good might have a limit of, oh, 1.50 amps. Beyond that they blow a fuse or fry some circuitry / components. So unless you can afford a sacrifical V-Ohm meter, I wouln’t do it. The cheapest way is to invest in a Battery charger that tells you what its doing at any given moment, something like an Acumen charger, got red, blue, amber and green LEDs that tell you if the battery is hosed, won’t hold a charge, or if it can be recovered, or when it is maxed out. Or you can just go out into your garage, get high on your recreational drug of choice and watch the free light show. Thats the truth, unless your battery is cheaper than the charger.
An Optimate is the same as an Acumen and does have all the dancing lights, but, as I say I want to know how to test it:)
That position in your pic/avatar there, looks like it would be painful after a while. Sore neck?
no seen as it only took me a couple of seconds to take the picture lol