"The Natural Philosopher" wrote in message
...
Peter Parry wrote:

On Sun, 14 Dec 2003 11:27:09 -0000, "Crooksie"
wrote:
snipped
time. Making it work at max output for several times the expected
time may well cause things to overheat and expire.


May, but not will.

But I doubt it.

What a partially dicsharged battery looks like is a low voltage source
in series with a bit of resistance - fairly negligible in comparison to
the charge currents being used. What happens if you stick a bigger
battery in the vcharge circuit is that it will run at the same charge
current (cos its voltage is the same) for longer.

I have xcharged car batteries with trickle chargers from one amp up to
15 amps. The battery is no different. The little chargers will still
charge the bigger batteries. Just takes a couple of days, is all.

Any charger is going to run full charge on all butteh smallest cells for
at least an hour...and if it hasn't blown in an hour, it won't blow in
three...its up to working temp in that hour.



The alarm panel will only have a transformer that supplies just enough to
keep things going at their designed working ratings, so making it work
harder can, and will, make it overheat inside the casing. This rise in
temperature inside the casing can, and will, have bad effects on other
components.

Most panel instructions will give a maximum battery capacity allowed for
that design of power supply, so to increase this capacity can, and will,
have effects on the design of the system and will void any warranty.

The charger system may well be a voltage / current source with a bit of
resistance, but you have to take into consideration the environment that the
source and resistance are working in. The system expels heat into its
surrounding space. The space within, and the connected heat dissipation
appliances, should be enough to safely exhaust that heat away from the
appliance. Increase the heat, or close in the space, and you have to
consider what effect these change will have within the working parameters
that have already been designed into the system.

The increase in the "HUM" sound heard, probably means the power supply is
working harder to keep the increase in battery capacity up to the system
ratings. So this means an increase in heat produced by the power system.
This increase is probably not designed for by the makers, so it can, and
will, effect the designed for working state of the system.

The power supply is rated to take what the makers allow for in the design of
the panel, so making changes to these parameters will affect what is allowed
for in the design. If the power supply has to work harder at charging the
battery, then it is probably not supplying other parts of the system with
the correct power source they need to work properly.


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