How did you work out 9%?
OK,
To cover the fully charged and discharged state of the battery,
ie: 13.8V and 10.8V, assuming for the test, the battery has an internal resistance of 0.1R
A solar cell with and emf of 17.5V and internal impedance of 5R.
I ran LTSpice simulations for charged/discharged battery, charging currents using a closest match silicon diode and schottky diode.
See attached image:
The results show for 13.8V approx 11% and for 10.8V, 5%
If you take an average, it suggests an increase of 8%.... so I was 1% high in my rough calculation.
Does this answer you.?
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