6V 12 V charging question

Hi Mfewster,

Why not use 2 12 volt batteries in series to give you 24 volts and make up an 18 volt power supply to supply your requirements. You can then charge both batteries together with your CTEK but only set up as 12 volts. In other words, parallel charging. This would require you to remove the device running on 18 volts while the batteries were being charged.

It all depends on how many amps you require at 18 volts.
A bit more info and we could give you some better advice hopefully.

Just a thought.

Cheers, Bruce.

Yep, got it, 18 volts for the EFTPOS machine = low amps.

G'day Mfewster,
Just a thought, could you use one of those Laptop power supplies from Jaycar or DSE (12vDC to selectable 15, 16, 17, 18, 19, etc vDC) may save a lot oh hassles.
Cheers,
Barry.

Sure. We are running a market stall. Used to be able to use 240v power but this is no longer available at the site. We need to run some strings of leds that run off 12v. Our eftpos machine uses 18v. We will use a small 12v and a 6v together but just tap off from the 12v for the lights.

is that the "round" plug on the eftpos.... i would look at an inverter for the eftpos, most probally cheaper....
May even be better for the lights as well, check to see if it is 12v dc or 12v ac...
Cheers
Joe

What Joe said.

Lots of advise but nobody suggested a DC booster yet. I got them from E-bay and use one to boost 12V from a battery to 24V to run a portable drill to drive a winch. The output is adjustable, it has a 150W rating though for that it may need a bigger heat sink. Anyway, no problems running an 18V battery drill on 24V off a 12V battery.
Oh, it was around $25.-
If you can't find it on ebay email me for the URL.

Thank you Joe, Murray, Boobook amd GBC. I'm going to rethink this.

Yeah, they don't have to worry about keeping 3 batteries charged, and they sell you lots of batteries and chargers.

Jaycar sell good Laptop Supplies that will put out 18 volts from 12 !

Assuming you have access to a 12 volt battery, this one can put out
3.5 amps and you only need to spend $29.95 !!!!
Jaycar Supply