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How to build a power source

Noticed two things:
1. If I minimize FS window I have the impression that the battery is drained much faster. With FS in foreground it takes ~10 mins per V at 20 A. With FS in background about 1 min/V... have to perform more detailed tests
2. If a generator is on the battery gets always charged even if the generator does not supply enough amps to compensate for the total load.... so power seems to be generated out of nowhere...
Do you see similar things happening?
 
So, extra tests.
Apparently I was wrong. Recent tests showed that the battery drained at constant pace both with FS maximized or minimized. That's comforting.

Now, I run a test on C172, Lear45 and B747. All batteries seems to have the same capacity of ~0.5 Ah/V. So with 24 V battery the charge is 12 Ah... well, my car gets about 6 times more than that.
Another problem is that the discharge is happening linearly. If we consider that our circuit cuts off at 17 V, then the total usable battery charge is just 3.5 Ah.... disappointing.
Possible way to tweak it:
1. reduce the consumption accordingly
2. use FSUIPC "magic battery" function
3. lower the cut off voltage for all systems
4. increase the max voltage
....
or live with it...
 
It's a super simplistic electrical system... nothing accurate about it. Has always been that way.
 
I know it is simplistic, but here i am trying to figure out how it works exactly and how to work with it. Of course redesigning a whole panel not to use it is the best, but not so easy if you just want to plug a better electrical system in existing products.

Other finding: battery in time acceleration works until x4. After that the draining is not properly computed, in the sense that fs clock ticks faster but the decrease rate of battery paces at the one of x4. So at x128 the battery drains extremely slow
 
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