On Mon, Sep 13, 2010 at 11:30:08AM +0200, Spiderdab wrote:
> >
> i have measured the current consumption. my notebook takes about 1A
> 220V,
Looks like your inverter and adaptor, compounded, are only around 30%
efficient. (Compare that 220W with the label on the back of the
notebook, or the output declared on the adaptor's label. e.g. 15v x 4A
on mine.)
Taking nearly 20A from a 100AH battery is twice the 10 hour rate. It
only has 100 AH capacity at 10A. It will not provide 20A for 5H.
> and the driver with the 4 stepper motors in action take around 0,4A
> 220V. so i'm using one 150W inverter for the notebook (it has a medium
> life battery which can help about current consumption) and a 175W
> inverter for the driver and motors. it's three days that i'm playng
> and training with this configurations without charging the battery.
> (maybe this night..)
It is a good idea to charge it after each daily use.
A car battery is built to handle shallow discharge cycles only.
Deep discharging of a lead-acid battery shortens its life markedly.
Even Deep Cycle batteries don't last long if run flat.
> but i was thinking too, of using two batteries in series (24V) to power
> up the driver card directly, and to use only one inverter on one of the
> two batteries for the notebook. what do you think? is it going to work
> better for sure?
A 24v inverter would be even better for the batteries, but why not
eliminate both, and supply also the notebook by dropping the 24v to the
required voltage? If your nameplate reads 15v, like mine, then 15/24 =
62%, even if you use a simple linear regulator. (Just make sure the
voltage and polarity are right, or the notebook becomes a sad
paperweight.)
Erik
--
The universe is not required to be in perfect harmony with human ambition.
- Carl Sagan
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