Tuesday, Sep 27, 2016 at 17:20
Hi Boobook
That's the trick , you don't need to run the device(s) at its peak.
In my top reply here I referred to using 3 cheapies in parallel which maximizes the performance and was appropriate for my case.
The 0.2v drop only occurs at very low currents hence my reference to "Trickle charging". (sort of free top up that keeps battery fresh)
Also at the other end , it doesn't matter much that if you are drawing heavy currents and voltage drop goes up when the battery is low because in this mode
the battery has a lower terminal voltage anyway.
That's the beauty of this simple system, apart from preventing the backfeed issue - its also self regulating , as battery demand drops off and its terminal volts increase then the need for charging current decreases.
You will find the same principle used in solar panels.
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