Let's talk Ah

Carpmart said:
Seals already out Steve… 230 socket removed also… and yes, it looks cleaner and tidier than when I took the picture! 😇

just got cabling and pipes at the bottom back… will have to try it and see… when it arrives!

View attachment 1006691
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You may have to do something there ours was completely square?
 
As I said, the 2 words "per hour" only add confusion.

The unit of electricity is not amps per hour. It is (the French and original ) Ampere Hour. Or in English Amp Hour.
 
There are several units of “electricity”, depending on what you are measuring. TBH an amphour (1Ah) could be represented as 3 600C (coulomb) but it would not be particularly useful.
 
Rapido925M said:
Why would anyone join 2 x 12V batteries in series to provide 24V when (all?) our low voltage appliances work on 12V?
Join them in PARALLEL!
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Morelo have from this year made all 24Volt liners 24Volts in the rear. Makes life much simpler and shall reduce the cable sizing I guess, more voltage = less current.
 
Most real scientists Re on the skittish side with hilarious consequences at times. Not sure how many suffered from a sense of humour failure. Having met a few at Bell Labs, EMI research, and Cambridge Science park, some are so focused on their work, they have no time for frivolity. Others had a tremendous senses of humour.

I was not around to meet Monsieur Ampere, so can't comment. He would no doubt have been thrilled at the concept of particle physics explaining many of his discoveries over a century after his death.
 
My view is you should be using what you consume, Watts, or Wh or kWh depending on the circumstances.

Then voltage becomes irrelevant to your sums and you can apply the Watts you are using to 12v, 24v, 48v or 240v.

Your 1200 Wh (100Ah at 12v) battery for example can supply its Watts to whatever system you want ( less losses ) by knowing the power of the devices rather than how many amps they consume ( which will vary by voltage ).

If all you have is a 12v system and don't wish to talk to anyone else about other voltages it wont matter.
 
Cant see anyone mentioning Ohms Law, now at college in Essex we were told the acronym for this was Virgins Are Rare V/AxR....I guess thats how you get teenagers to remember stuff, although politically incorrect these days the acronym still works!
 
Coolcats said:
Cant see anyone mentioning Ohms Law, now at college in Essex we were told the acronym for this was Virgins Are Rare V/AxR....I guess thats how you get teenagers to remember stuff, although politically incorrect these days the acronym still works!
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You brought back some memories from my school days, Dr. Barclay was my Physics Master, he would belt the meter stick on the bench in front of you and you had to recite whatever he requested…..”Ohms Law!”….”The current in a closed DC circuit is directly proportional to the voltage but inversely proportional to the resistance provided the temperature remains constant, mathematically expressed as V = IR….Sir”

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More accurately R= V/I or Ohms(Resistance) = V(Volts)/I(Ampere's)

More traditionally it was E = EMF (Electromotive Force) for voltage and I was/is 'Intensity' in Amps..

As long as you remember its a three section triangle with V or Volts is always on top, its easy to work out.
1738746211469.webp


So using the above:
I = V over R (V/R)
R = V over I (V/I)
and V =IR (I x R)
 
I've removed the comments from the original thread That post strived to be a simple explanation of Ah for newbies, I'm afraid the subsequent discussion might scare them off '\. There is a link in that thread to here should they wish to delve deeper.
 
Jabstatt said:
I think you will find that a lot of larger RV type vehicles run on 24v.
Great where more power is needed and it’s standard for starting larger diesel engines.

Tony
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The chassis do, the internals dont

Very difficult to source 24 VDC RV stuff
 
One off the last Snap On tools I bought off the truck (a travelling sweet shop for the motor trade) was a 48VDC electrical circuit tester

In 2025 about 10 manufactures are expected to launch 48VDC vehicles with many more to follow

God knows why

I mean I fully understand the rationale behind 48 volt systems, but have no idea why I bought a 48volt tester as the last Snap On tool I bought December 2022 when I retired two days later 👋

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meanders said:
More accurately R= V/I or Ohms(Resistance) = V(Volts)/I(Ampere's)

More traditionally it was E = EMF (Electromotive Force) for voltage and I was/is 'Intensity' in Amps..

As long as you remember its a three section triangle with V or Volts is always on top, its easy to work out.
View attachment 1008836

So using the above:
I = V over R (V/R)
R = V over I (V/I)
and V =IR (I x R)
Click to expand...
Or, just put a division under V, and a multiplier between I and R. Cover with your finger the one you need to calculate;
Another triangle for power, replace V with P and R with V and you got the power triangle.
This 2 formulas can be transponded into almost any calculation necessary in electrics.
 
Coolcats said:
Cant see anyone mentioning Ohms Law, now at college in Essex we were told the acronym for this was Virgins Are Rare V/AxR....I guess thats how you get teenagers to remember stuff, although politically incorrect these days the acronym still works!
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We were taught Virgins in rubber. Obviously indicating a physics fetishist, or should that be phetishist.
 

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