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Author Topic: Cheapish battery charger that can be left on, even when battery is under load?  (Read 1541 times)
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« on: November 10, 2011, 11:23:30 AM »

I know very little about battery chargers.

Basically, what im looking for is a mains powered charger that can be left on all the time, regardless of the load applied to the battery.

Possibly all (basic) chargers are good for this - i just dont know!

I was looking at the Gunson 4104 for use with a battery desulphator ( ) so im wondering if somthing as simple as that would work, or if im just going to run into issues?

Im wanting to use the battery almost like a capacitor, as i need to take occasional high ampages from it - i could just buy a high ampage 12v power supply, but i have a battery / basic charger, etc. anyhow, so im just wondering if i cant use them?

Custom CNC engraved control panels for diy projects -
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« Reply #1 on: November 10, 2011, 01:01:05 PM »

When the battery is under load the voltage will drop and pull too much current from the charger which will overheat and possibly burn out. A simple solution is to put a 12 or 21 watt 12v light bulb in series with the charger, this will limit the current in the event of battery discharging. The battery will still have a trickle charge just not quite as much as if directly connected to the charger.

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« Reply #2 on: November 10, 2011, 09:55:27 PM »

Why do you want to charge a battery 24/7 ?
If you have  electricity available 24/7 why are you using a battery ?
more info please.
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