Is a B&D Simple Start safe to use?

[HarryM1BYT]

Originally Posted by VMax1000

Does 6Ah equates to 360 A per min ?

Actually I did, and I agreed with you, except a 6aH battery at that rate of discharge (even supposing it could support that rate of discharge, would only support it for a much shorter time than 60 second. Likely it would manage it for a fraction of a second.

[VMax1000]

Originally Posted by HarryM1BYT

Actually I did, and I agreed with you.

Thank you

And would 360 Amps per minute be enough to start a car ?

[HarryM1BYT]

Originally Posted by VMax1000

Thank you

And would 360 Amps per minute be enough to start a car ?

Almost certainly, yes, but where are you getting the 360aH from?

Surely you don't mean from a 6aH battery, or the 6aH transferred across into the main battery - simply because it doesn't work like that. In fact you will be lucky to get 1/6th of that into the main battery.

[VMax1000]

Originally Posted by HarryM1BYT

Almost certainly, yes, but where are you getting the 360aH from?

Surely you don't mean from a 6aH battery, or the 6aH transferred across into the main battery - simply because it doesn't work like that. In fact you will be lucky to get 1/6th of that into the main battery.

Right, 6Ah = 6 Amps per hour.
Therefore it is the same as 360 Amps per minute

How long does it take to start a car ??

I can see why it wouldn't work after my initial reservations

[HarryM1BYT]

Originally Posted by VMax1000

Right, 6Ah = 6 Amps per hour.
Therefore it is the same as 360 Amps per minute

How long does it take to start a car ??

I can see why it wouldn't work after my initial reservations

6aH in one battery, will not translate to anything near 360aM in another battery. Batteries just do not work that way, they are not buckets.

How long it takes to start a car, depends on how quickly the car will normally start, but also depends heavily upon the state of charge of the battery.

[VMax1000]

I'll leave you to it.

I'm sure your advice will be invaluable to members who are less knowledgeable but I will trust my own knowledge

[SD1too]

Originally Posted by VMax1000

The document please....

Sorry for the delay Herman. Here is the document:

http://homepages.which.net/~paul.hil...eriesBody.html

The discharge characteristics I referred to earlier are in section 7.2. When you've read this I hope it will be clear to you why 6Ah does not equate to 360 amps per minute.

If you're still unconvinced, the next time you have access to a discharged battery connect it to a mains charger via your multimeter on a 10 amp range. Watch what happens to the current over time.

Simon

[VMax1000]

Originally Posted by SD1too

Sorry for the delay Herman. Here is the document:

http://homepages.which.net/~paul.hil...eriesBody.html

The discharge characteristics I referred to earlier are in section 7.2. When you've read this I hope it will be clear to you why 6Ah does not equate to 360 amps per minute.

If you're still unconvinced, the next time you have access to a discharged battery connect it to a mains charger via your multimeter on a 10 amp range. Watch what happens to the current over time.

Simon

Sorry but fail to see the link to what I've said.............

Harry is an electronics engineer..............he can help

Think I'll throw my degree in the bin. It's worthless with all the so called self taught around

And what happens with current over time is the same as people over time............it dies....

[HarryM1BYT]

Originally Posted by VMax1000

Sorry but fail to see the link to what I've said.............

Its a website, which includes the graphs (section 7.2) which compare amp/hour rate versus discharge time. Something which several of us have tried a number of times to explain to you, but you appear to be in some sort of denial.

Once again - If you discharge a battery at its specified C/? rate, you may find it produces close to its stated aH capacity. Discharge it at a greater rate than C/? and the a/H available declines very rapidly. The C/? is usually quoted as a 10 hour discharge rate.

Why you have decided to completely ignore such an important factor as the discharge rate and do so repeatedly in your calculation, is anyone's guess.

Care to come clean at last and using the above mentioned graph - make an estimate of the a/H capacity of a 6 amp/Hour battery discharged at a 20minute rate?

Harry is an electronics engineer..............he can help

Think I'll throw my degree in the bin. It's worthless with all the so called self taught around

If you do indeed have a degree, then that is what I would be inclined to do with it. You have assumed the 'self taught' - you really have no idea of the qualifications of those you have been arguing with and I for one would never declare my qualifications, for the purposes of arguing in a internet forum.

And what happens with current over time is the same as people over time............it dies....

Yes if you discharge a battery rapidly, it will surprisingly rapidly go flat.

[berkshirelad]

Originally Posted by SD1too

Yes, I seem to remember others reporting this. Yours is a 2002 car, yet my 2003 wiring diagram shows the cigar lighter wired directly from the battery!

The lighter must draw a pretty hefty current. Is there a relay feeding it in your car? I wonder if this is what MG Rover have labelled an 'auxiliary socket'?

Simon

Yes R132 in the passenger fuse box. Mine is a 2002 registered Tourer
There is a further fuse and no relay for the auxiliary socket