Posted by spaco on October 31, 2008, 7:55 pm
What is it that you want to do? The reason I ask is that a battery's
internal resistance changes when it charges. This means that the
terminal voltage increases to some value above its steady state voltage
while being charged. when the charging voltage is removed. the
battery's terminal voltage drops to some steady state value.
An example: A 12 volt car battery being charged at 2 amperes may float
up to about 13.1 volts to match the charger's output. Remove the
charger and wait 24 hours, and the terminal volatge might drop to 12.6.
This voltage will vary depending on the condition of the battery.
Depending upon what you want to accomplish, this characteristic may
make your task harder.
Posted by ukmp on November 8, 2008, 8:11 pm
Ibought an inverter which works very well but it has auto alarms for
low and pre low voltage.
I was looking for a way to neutralise the alarm Instead of dismantling
it and killing the speaker. The inverter is a ditance from the house
but close to others and i dont want the alarms going of in the middle
of the night whearas if it cuts the ac vlotage to the house i can
easily switch a transfer switch in the house.