So as far as testing goes you gotta do a couple of things.
If you measure the time and voltage of 3 batteries in parallel that will give you a HIGH baseline. AGM's are rated at 80% capacity. so a 7 amp hour has 5.6 amp hours available.
7 x .80 = 5.6.
3 in parallel 16.8 amp hours available. So if you discharge at 2 amps you should reasonably get 8.4 hours of running.
But we have something different in the 3bgs. You have a battery that is 24v 7 amp hour in parallel with a battery that is 12 volt at 7 amp hour.
This gives you the effective voltage of 18v. So that give rise to the amp hour in the 24 volt bank and reduces the amp hour in the 12 volt, Technically Speaking .
So we can figure out the supposed amp hours or we can just settle on the parallel and if we beat it then you have proven the case. But you are shooting yourself in the foot by setting the goal almost 3+ times higher than it really is. So lets look at it.
From 24 volt to 18 volt is a 25% reduction in voltage so it gives you a 25% increase in amperage. At 5.6 amp hour in 24v to start and at 18v you'll be at (.25 * 5.6 = 1.4 + 5.6 = 7) 7 amp hour.
Now we have to do the opposite for the 12 volt but it looses 33.3%. In amp hour so 5.6 ah at 12v is now at 18v 3.375 ah (.333 x 5.6 = 1.865...5.6 - 1.865 = 3.375)
So now the total of the battery is around 10.375 amps. Discharging at 2 amps we should run somewhere around 5 hours.
But because this is a potential based system and we are also storing energy this all changes for the worse. Because we actually have to calculate the amp hours of the battery and every voltage change and subtract the time it has run then do just the opposite for the charged batteries.
All that is real possible with a good scope and some programmable math functions maybe on a PC that records.
I only bring this up to show you how ridiculous it can get if you are trying to prove anything to someone who is a true test engineer. They actually have no MATH to accommodate this situation and the above is the most effective way of telling how it all works out. I have been through it I know.
If anybody is actually willing to do the testing in the above manner or maybe has a better perspective on the math needed for the test speak up. I would be happy to help you set it up.
Cheers
Matt
If you measure the time and voltage of 3 batteries in parallel that will give you a HIGH baseline. AGM's are rated at 80% capacity. so a 7 amp hour has 5.6 amp hours available.
7 x .80 = 5.6.
3 in parallel 16.8 amp hours available. So if you discharge at 2 amps you should reasonably get 8.4 hours of running.
But we have something different in the 3bgs. You have a battery that is 24v 7 amp hour in parallel with a battery that is 12 volt at 7 amp hour.
This gives you the effective voltage of 18v. So that give rise to the amp hour in the 24 volt bank and reduces the amp hour in the 12 volt, Technically Speaking .
So we can figure out the supposed amp hours or we can just settle on the parallel and if we beat it then you have proven the case. But you are shooting yourself in the foot by setting the goal almost 3+ times higher than it really is. So lets look at it.
From 24 volt to 18 volt is a 25% reduction in voltage so it gives you a 25% increase in amperage. At 5.6 amp hour in 24v to start and at 18v you'll be at (.25 * 5.6 = 1.4 + 5.6 = 7) 7 amp hour.
Now we have to do the opposite for the 12 volt but it looses 33.3%. In amp hour so 5.6 ah at 12v is now at 18v 3.375 ah (.333 x 5.6 = 1.865...5.6 - 1.865 = 3.375)
So now the total of the battery is around 10.375 amps. Discharging at 2 amps we should run somewhere around 5 hours.
But because this is a potential based system and we are also storing energy this all changes for the worse. Because we actually have to calculate the amp hours of the battery and every voltage change and subtract the time it has run then do just the opposite for the charged batteries.
All that is real possible with a good scope and some programmable math functions maybe on a PC that records.
I only bring this up to show you how ridiculous it can get if you are trying to prove anything to someone who is a true test engineer. They actually have no MATH to accommodate this situation and the above is the most effective way of telling how it all works out. I have been through it I know.
If anybody is actually willing to do the testing in the above manner or maybe has a better perspective on the math needed for the test speak up. I would be happy to help you set it up.
Cheers
Matt
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