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Old 07-06-2014, 05:22 PM   #31
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Electricity: Espresso Machine in Car


Quote:
Originally Posted by dmxtothemax View Post
I beleive the o/p said about 30 cups ?
See post #14.

Anyway it doesn't matter that much, as you still will need a minimum of 4 x batteries,
as there's a safe limit as to what you can draw from batteries
and this is about the maximum you can do without destroying your batteries.
Ain't gonna need 4 batteries. 30 double shots of espresso is only 60 ounces. As I said before, 300 watts will heat 1.75 gallon(224 ounces) of water from 50 to 120.

If the OP does the test I posted to do earlier, he'll know how many cups he can make from 1 battery.

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Old 07-06-2014, 08:08 PM   #32
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Electricity: Espresso Machine in Car


I think that if you try to use one battery
then it will have A very breif life.
You can only take so much out of a battery
Before you damage it.
Where talking 100a +
For the appliance that the O/P stated.
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Old 07-06-2014, 08:10 PM   #33
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Electricity: Espresso Machine in Car


Quote:
Originally Posted by dmxtothemax View Post
I think that if you try to use one battery
then it will have A very breif life.
You can only take so much out of a battery
Before you damage it.
Where talking 100a +
For the appliance that the O/P stated.
Not taking 100 amps out of the battery.
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Old 07-06-2014, 10:55 PM   #34
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Electricity: Espresso Machine in Car


I am going on the method that the O/P suggestted !
What method are you suggesting ?
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Old 07-06-2014, 11:22 PM   #35
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Electricity: Espresso Machine in Car


Quote:
Originally Posted by dmxtothemax View Post
I think that if you try to use one battery
then it will have A very breif life.
You can only take so much out of a battery
Before you damage it.
Where talking 100a +
For the appliance that the O/P stated.
I'm not sure what all the fuss is about here. 100 amps out of a 12 volt lead/acid battery is nothing too outrageous. Heck... your average high output automotive alternator will put out 120.

A few years back we used a D8 truck battery to do some welding out in the bush. We ran welding cables directly off the battery. About two hours of welding 3/8 inch steel plate and there was still enough charge in the battery to start the truck.

Your average car battery will STILL start a stone cold car at minus 35 or 40. I know because I live in Manitoba and do it regularly in the Winter.

The capacity on just a regular car battery is on average:
925 cold-cranking amps, 1100 cranking amps, 190 minutes reserve capacity.
If you go up to a d8 battery you're looking at:
1155 cold-cranking amps, 1380 cranking amps, 400 minutes reserve capacity

You can get a 3000watt inverter right off the shelf from just about any big box store and at 3000 watts you're looking at 250amps. No problem for a good quality car battery.

I have a 1500W in my van which pulls 125 amps at full load... and I can go quite a while without killing anything.

100amps? No big deal.

Last edited by Bob Sanders; 07-06-2014 at 11:25 PM.
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Old 07-07-2014, 04:17 AM   #36
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Electricity: Espresso Machine in Car


Quote:
Originally Posted by dmxtothemax View Post
I am going on the method that the O/P suggestted !
What method are you suggesting ?
A 100 amp draw for 5 minutes, is not taking 100 amps out of the battery.

Just like in a house, a 12 amp draw draw on a recpt is not using 12 amps in 5 minutes.
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Old 07-07-2014, 06:35 AM   #37
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Electricity: Espresso Machine in Car


Quote:
Originally Posted by beenthere View Post
A 100 amp draw for 5 minutes, is not taking 100 amps out of the battery.

Just like in a house, a 12 amp draw draw on a recpt is not using 12 amps in 5 minutes.
Again you mix up amps and amp-hours. What size cables would you use for the 5 minute
100 amp load?
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Old 07-07-2014, 07:08 AM   #38
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Electricity: Espresso Machine in Car


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Originally Posted by beenthere View Post
Just like in a house, a 12 amp draw draw on a recpt is not using 12 amps in 5 minutes.
Actually, it does. A 12 amp draw will draw 12 amps for how ever long you leave it connected.

If you leave it connected for an hour then you have taken 12amp-hours. If you leave it connected for 5 minutes then it's 1 amp-hour, but either way the draw was 12 amps.
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Old 07-07-2014, 10:23 AM   #39
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Electricity: Espresso Machine in Car


This like the commonly misunderstood difference, by the public and even some users on this site, between kilowatts and kilowatt-hours. A kilowatt is a measure of the rate of doing work, a kilowatt-hour is a measure of quantity of energy.
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Old 07-07-2014, 03:29 PM   #40
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Electricity: Espresso Machine in Car


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Again you mix up amps and amp-hours. What size cables would you use for the 5 minute
100 amp load?
No, again I am not mixing them up. Some people seem to think if it draws at a 100 amp rate for 5 minutes. It used up 100 amps/1200 watts. It didn't. It would have draw at that 100 amp rate for 1 hour to use up 100 amp hours. So a battery with a 100 amp hour rating will make more espresso then the OP said he is going to be making.

Without looking it up, I would say a 2 gauge for a 100 amp draw rate. Which doesn't mean it will use 100 amp hours at any given time of use.
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Old 07-07-2014, 03:30 PM   #41
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Electricity: Espresso Machine in Car


Quote:
Originally Posted by Bob Sanders View Post
Actually, it does. A 12 amp draw will draw 12 amps for how ever long you leave it connected.

If you leave it connected for an hour then you have taken 12amp-hours. If you leave it connected for 5 minutes then it's 1 amp-hour, but either way the draw was 12 amps.
I said that one badly.

But the espresso machine will not use 100 amp hours to make 30 cups of espresso.
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Old 07-07-2014, 09:18 PM   #42
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Electricity: Espresso Machine in Car


Quote:
Originally Posted by beenthere View Post
I said that one badly.

But the espresso machine will not use 100 amp hours to make 30 cups of espresso.
Agreed. Including warm up I wouldn't think it would take more than 5 or 10 minutes for a couple of cups.

Lots of power left over for a bit of welding
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Old 07-08-2014, 12:29 AM   #43
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Electricity: Espresso Machine in Car


A bit on the posh side.....I would think a cooler with a few pints of lager would be the preference. Or, some Port and Stilton.
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Old 07-08-2014, 04:54 AM   #44
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Electricity: Espresso Machine in Car


Quote:
Originally Posted by beenthere View Post
I said that one badly.

But the espresso machine will not use 100 amp hours to make 30 cups of espresso.

NO !
But the expresso machine will pull 100A NOT 100AH,
and most single batteries will not put up with that sort of a draw
for any extended period, for a few seconds yes, but continuously NO.

Normal car batteries are designed to provide a large discharge for a short period, usually it's only for 3 to 4 seconds (when starting a car).
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Old 07-08-2014, 07:10 AM   #45
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Electricity: Espresso Machine in Car


Quote:
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Normal car batteries are designed to provide a large discharge for a short period, usually it's only for 3 to 4 seconds (when starting a car).
True.... but then 100amps is not big for a lead/acid battery. They make car stereos which will pull more than that. Starting amps for a car is MUCH more than 100amps on a cold Winter day. Cold cranking amps on an average battery is up around 800 to 1200 or 1300 depending on the quality.

I think part of the problem here is that this site is full of residential/commercial electricians who are used to the idea of higher voltages (and therefore lower amperages).

It's a bit different in the automotive field. Because the voltage is lower, the amp numbers that get tossed around are MUCH higher. Electricians look at 100 amps in terms of a supply for an entire house. In the automotive industry however 100amps is not much more than a good quality stereo amplifier.

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