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Joined: 09/08/2007
Location: Australia
Posts: 4384
Posted: 09:41pm 19 Jan 2022
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  InPhase said  Isn't it the same thing?

Its certainly the same as far as the cell is concerned.

It might be easier to visualise discharging a capacitor.
You can allow the charge to just slowly drain away through a resistor.

Or you could connect the capacitor to a reverse polarity power supply and actively charge it in the reverse direction to pull the voltage (and stored charge) down to zero.
The energy supplied by the reverse polarity supply is not free power, it must come from some source.

If you do it all with solar fine, that is free power, so it does not matter.
In fact its an excellent idea.

But if you had a big factory repetitively discharging plante cells, hundreds or thousands at a time, and you used grid power to speed up the discharge, there will eventually be a power bill to pay.

In fact you pay twice, once for charging, and again for discharging.
With resistive discharge, you only pay for charging.
Cheers,  Tony.
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