Does it matter?
Actually, if you are going to any electrical work, Ohm's Law is one of the first things you need to learn. It will help you in wire sizing, fuse sizing, battery sizing, inverter sizing and wind turbine and solar panel guessing. You will learn why 100W of 12V soler panel only net you 60 Watts in your storage device and why the battery bank is still too small... no matter what you do...
And to actually answer the train question, one would need to know, "At what time". The 25mph train may have started its' trip last week and the 75mph train at lunch.
Ron Adventure is just bad planning." -- Roald Amundsen [ Parent ]
Now Ron,
Its harder than most will tend to realize, to get a reply from yourself umm, um.
"Does it matter?"
Well, yes Ron, it does. :)
If I have only 2, 6volt batterys, with an amphour rating of 255 they would have to be wired in series to get 12volts, so 'I' times 'V' equals 'P'. Yet there amphour capacity cannot increase higher than 255 wired in series at 12 volts.
Why is there such a difference with top capacity, such as with a 12volt batt, like 125 amphour? There basically the same size and physical weight?
Further more, unless you give some basic consideration to series-parallel circuit law, the 6 volt batterys you speak of, only confuse the issue.
:):):):):)
JW
[ Parent ]
To make things simple take your Voltage X Amperage and you will get Watts. In our 'amperage' figure there is a time, the hour, so our final figure is in Watt Hours.
12V X 255AH = 3060Wh or, converting to kWh, 3.06kWh at 100% discharge.
Now note if we had worked with 6V Batteries it would have been 6V X 255AH = 1530WH and we would have needed to multiply by the umber of batteries (2) and we end up at the same place.
The 'real' way to calculate power is a lot more interesting and involves a bit of higher math than we want to go into here. It also yields similar results. The power in the bank is the number of batteries X the capacity of each battery.
Don't forget, that is at 100% discharge. The figures need to be lowered for any practical application.
