How much battery drain? (1 Viewer)

[OldWomble]

Morning all
i know there are some pretty clued up electrical wizards on here so I’d appreciate a bit of help.
if I run a 1250 watt coffee machine for 6 minutes via a 1500 watt inverter, how much will I drain my battery? I keep trying to work it out and keep getting different answers

 

[pappajohn]

10.416 amps plus loses..... Around 11.5 amps total per 6 minutes at 10% loss

 

[St3v3]

10.416 amps plus loses..... Around 11.5 amps total per 6 minutes at 10% loss

Just to clarify, that's 11.5 Ah.

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[pappajohn]

Just to clarify, that's 11.5 Ah.

11.462 amps per 6 minutes assuming 10% inverter loses.

Watts divided by volts equals amps.

 

[St3v3]

11.462 amps per 6 minutes assuming 10% inverter loses.

Watts divided by volts equals amps.

11.462 Amp Hours, of battery capacity per each 6 minutes of use.

 

[pappajohn]

I

11.462 Amp Hours, of battery capacity per each 6 minutes of use.

OK, If you want to be pedantic.

It will use 114.62 amp hours

But It still uses 11.462 amps in 6 minutes

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[St3v3]

But It still uses 11.462 amps in 6 minutes

No, it uses 11.462 Amp Hours in 6 minutes.

Whenever it's running it will draw 115 amps.

 

[funflair]

OldWomble I hope you have got your answer now but just to confuse you even more you might find that the coffee machine doesn't pull maximum power for the full 6 minutes

 

[OldWomble]

Thanks guys, that’s about what I worked out so perhaps I’m not as daft as I thought!

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[pappajohn]

OldWomble ...... Every time you make a coffee it will discharge your battery by 11.462 amps.
That's 11.462 amps less than you had before you made a coffee.
Only pedants confuse things with amp hour etc.

 

[pappajohn]

OldWomble I hope you have got your answer now but just to confuse you even more you might find that the coffee machine doesn't pull maximum power for the full 6 minutes

Maybe not, but that's a bonus.
Work on 11.462a and there'll be no disappointment.

 

[St3v3]

OldWomble ...... Every time you make a coffee it will discharge your battery by 11.462 amps.
That's 11.462 amps less than you had before you made a coffee.
Only pedants confuse things with amp hour etc.

The battery capacity is marked in amp hours. How is that confusing things?

What would be confusing (!) is if the OP wired up his inverter with cable to support the 11 amps you told him it would draw and set fire to his van.

The pedant comments aren't really necessary, a simple yes, you're right would have sufficed.

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[pappajohn]

The battery capacity is marked in amp hours. How is that confusing things?

What would be confusing (!) is if the OP wired up his inverter with cable to support the 11 amps you told him it would draw and set fire to his van.

The pedant comments aren't really necessary, a simple yes, you're right would have sufficed.

Now go back and read the OP.

how much will I drain my battery?

The OP will drain 11.462 amps
He will not drain 114..62 amps in 6 minutes though 114.62 amps hour will pass through the wiring for 6 minutes.

 

[OldWomble]

Hey guys, please don’t fall out over it, I appreciate both your comments and I’ve got the drift of what your both saying. Thanks again and Happy Christmas to you all!

 

[St3v3]

He will not drain 114..62 amps in 6 minutes though 114.62 amps hour will pass through the wiring for 6 minutes.

NO!

Current is measured in Amps.

Battery capacity is measured in Amp Hours.

If you have a 10 amp device running for 1 hour, a current of 10 amps will be flow through the wires.

This will use 10 amp hours of the available battery capacity.

If you were to run the same device for half an hour:

10 amps will flow.
5 amp hours will be used.

You got the maths spot on, but are confusing amps and amp hours.

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[St3v3]

Hey guys, please don’t fall out over it,

I won't. Glad you're sorted, Happy Christmas to you too.

 

[pappajohn]

As the OP has thanked us both for our input let's leave it at that.

 

[autorouter]

The OP will drain 11.462 amps
He will not drain 114..62 amps in 6 minutes though 114.62 amps hour will pass through the wiring for 6 minutes.

The current flow will be 114.62 amps for 6 minutes. 6 minutes is 1/10 hour. Battery capacity used (amp-hours) will be amps x hours, ie 114.62 x 1/10 = 11.462 amp-hours.

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