On 24/6/19 3:58 pm, Rod Speed wrote:


"Xeno" wrote in message
...
On 24/6/19 1:37 pm, Rod Speed wrote:


"Xeno" wrote in message
...
On 24/6/19 9:45 am, Clare Snyder wrote:
On Sun, 23 Jun 2019 12:05:52 +1000, Xeno
wrote:

snip


Â* Automotive charging systems that actually sense current are
EXCEDEINGLY RARE.

I've never seen one.

You just have. His Renault clearly is reducing the voltage once
it has decided that the battery is fully charged and that can
only be by sensing the current that the battery is taking.

It looks at the *voltage*. It operates on the *voltage* and it alters
the voltage according to the needs of the battery and the rest of the
electrical system.

The voltage doesnt tell you when a lead acid battery is fully charged.

The voltage is referencing the battery internal resistance. That
resistance changes (rises) as the battery charges.

The open circuit voltage of a battery is indicative of its state of charge;

Voltage | 11.7 | 12 | 12.2 | 12.4 | 12.6 or more
% Charge | 0% | 25% | 50% | 75% | 100%

No need to look at *current* to work out charge rate, the voltage
reading does the same thing.

--

Xeno


Nothing astonishes Noddy so much as common sense and plain dealing.
(with apologies to Ralph Waldo Emerson)