Help with circuit

I would appreciate help with this question.

I have a magnetic lock which I need to provide backup power supply to
(in case power goes down, it needs to function for as long as
possible).

The lock has an adaptor plug (which converts 120-240V 0.3 A mains power
to 12v 1.0 A output).

What I have done is to buy a computer UPS unit (Trust 600 UPS), plug
the UPS to the mans and the mag lock into it. Works BUT, if the power
goes down, it seems to only provide 20 minutes of power and then the
lock opens.

Now, can I use a car battery? I have a 12V car battery 60Ah 450A and
also a car batter charger (which trickle charges and stops
automatically to prevent over charging etc).

I am hoping this will provide me with longer life... however I am not
exactly sure:

1. If I can connect the lock directly to the battery. Do I need to put
in a fuse? Should I buy an inverter to change the 12 v to 220 and then
back to 12 v?
2. Assuming I can connect the lock directly to the battery, can the
battery be hooked up to the charger at the same time? Ideally, I want
the keep the battery hooked up so that it is always full... I realise
it should be run down once in a while

Your help would be greatly appreciated... needless to say, I didn't
want to create a fire hazard or damage the lock.

Regards

.

Relevant Pages

  • Re: Computer hard locks
    ... Humm you maybe right with this new PS I may be drawing more power, ... >> it doesn't seem to lock when it's there. ... >> I couldn't get my old copy of xp to install no matter what I tried. ... >using the network connection, and the shops weren't. ...
    (alt.comp.periphs.mainboard.asus)
  • Re: Converting mains battery charger for 12v operation
    ... >charger that comes with the camera as default). ... >charger so I can power it from car battery. ... >The large images are LARGE. ...
    (sci.electronics.design)
  • Re: Help with circuit
    ... I have a magnetic lock which I need to provide backup power supply to ... The lock has an adaptor plug (which converts 120-240V 0.3 A mains power ... can I use a car battery? ... also a car batter charger (which trickle charges and stops ...
    (sci.electronics.basics)
  • Re: Charging a Car Battery with a Bench Power Supply
    ... I mean it won't harm the supply if it can handle the power. ... I was thinking of putting an inline diode and power resistor ... 14V source across the car battery. ... Why not buy a proper car battery charger? ...
    (sci.electronics.design)
  • frequent crashes (experts only)
    ... experiencing frequent lock ups or crashes. ... thing you can do is manually press restart or power down ... system into a constant restart. ... windows was to boot up in safe mode, ...
    (microsoft.public.windowsxp.help_and_support)
Quantcast