12v power supply sorted

[96terrano]

well i have been wanting a 12 volt power supply in my room for years, think i even said here ages ago....anyway, i wanted it for running car parts instead of going out to my 4x4 all the time, have been experimenting with old step-down transformers from random electronics, PSUs etc and nowt had the required AMPs well, i have finally sorted my problem.....and it's simple, got the old 100AH battery that was from my terrano, heaved it up to my bedroom connected a trickle charger and a voltmeter, perfect, 12V power on demand in my bedroom when the battery gets low, i just connect the trickle charger, also, ill be mounting a volt & amp meter on the wall over the battery so i can keep an eye on it when in use

sorted


see it powering a jaguar radio with a Ford Maverick speaker connected

i will be sitting the battery in the corner of my room on a table, all neat tidy and out the way!



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[96terrano]

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[Fez_uk]

12v power supplies are cheap enough.

Also worth mentioning possible hydrogen from charging could potentially cause some issues?

[96terrano]

Originally Posted by Fez_uk

12v power supplies are cheap enough.

Also worth mentioning possible hydrogen from charging could potentially cause some issues?

Aye, but theirs no power supplys thatll chuck out the right amps
And yes, that did cross my mind about hydrogen, but I have a extractor fan rigged up as I do spray painting, so its all well ventilated and no h&s risks

[Fez_uk]

How many amps do you need?

[96terrano]

Originally Posted by Fez_uk

How many amps do you need?

Minimum of about 60 possibly, what will a terrano sized starter motor take under no load?

[Thomas-the-Terrano2]

I would have batter and charger linked full time, but not venting in habited room,

perhaps could be in shed then a 12V cables run to room.

thinking when charge in situ in caravan, its sealed vents to outside not into interior,
you say no h&s but could be fun with house insurance if does go wrong. ie fire etc.

[edgerton19]

Vented lead acid on charge in a bedroom is not a good idea.

1) During charge some acid vapour will be released (large hole in carpet)
2) Hydrogen and oxygen are evolved towards the end of charge and can explode spreading acid over you and your bedroom (more holes in carpet and curtains).
3) If the battery gets shorted there is a very significant fire risk (and more holes in carpet).

If you need a 20A or 30A REGULATED power supply then they are available at reasonable cost. I manage most of my design and test with either a Farnell LT30-2A (twin channel adjustable 30V 2A) or a Farnell L30-5 (adjustable 30V 5A) both are fully regulated. My 12V transmitter power supply is rated at 13.5V 25A and is small (switch mode) and has ouput protection. Large batteries live in the garage.

[96terrano]

Originally Posted by edgerton19

Vented lead acid on charge in a bedroom is not a good idea.

1) During charge some acid vapour will be released (large hole in carpet)
2) Hydrogen and oxygen are evolved towards the end of charge and can explode spreading acid over you and your bedroom (more holes in carpet and curtains).
3) If the battery gets shorted there is a very significant fire risk (and more holes in carpet).

If you need a 20A or 30A REGULATED power supply then they are available at reasonable cost. I manage most of my design and test with either a Farnell LT30-2A (twin channel adjustable 30V 2A) or a Farnell L30-5 (adjustable 30V 5A) both are fully regulated. My 12V transmitter power supply is rated at 13.5V 25A and is small (switch mode) and has ouput protection. Large batteries live in the garage.

Hmmm ok, thanks for that, in not to bothered about the carpet as its already got burn holes etc in it as all my room is is a car parts store and somewhere I test and build electronics and had a bed in it but I know what you mean, thing is, I do not actually have a shed, these power supplys you're talking about, are they DC? As I really need somthing to mimic a 12v battery

[Deano400]

As said, lead acid battery in bedroom= bad idea.

Did you think about one of those cheap start n charge packs ?

They have a sealed battery in them plus are easily charged and the batteries inside them are designed to be cycled unlike a car battery which will soon die if you keep discharging it.

[Deano400]

just a really quick look on ebay finds this.

http://www.ebay.co.uk/itm/Car-Batter...item20d3b75201

I'm sure there's more and maybe cheaper

[96terrano]

Originally Posted by Deano400

just a really quick look on ebay finds this.

http://www.ebay.co.uk/itm/Car-Batter...item20d3b75201

I'm sure there's more and maybe cheaper

Christ, I forgot about those, theyll be ok to use inside I guess too?

[kitchenman]

http://www.maplin.co.uk/compact-batt...pressor-624730

Does 300 amp, keep it charged or it will die

[Fez_uk]

No point in even getting those jump starter batteries, just buy a small 7ah sealed lead acid battery as thats usually all thats in them.

How often will you use the higher amps? Rarely then you might aswell get a small 5-7a bench PSU and if you need higher amps go to the 4x4 or shed and use a big battery.

You may not mind burn holes in the carpet but what about your face/skin?

[firebobby]

Ryan, I thought you were living in Toby on your drive