Need some advice with a problem I'm facing I'm trying to put a light into a coffee table so ideally I need it to be battery powered as the table will be placed into the middle of the room I would like a 10w cabinet light in it but can't seem to work out how to get a decent enough bulb to run off of batteries for a good amount of time. Anybody have any suggestions on how I might be able to achieve this? Any help greatly appreciated.
light to run off a battery
- Thread starter mattym
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A lot of led lamps and led strip is 12v dc, so id expect that to be ok using one of them cube shape 12v batteries
How many hours of light would I be able to get from one of these?
You'll need to do a bit of maths. What ever the wattage of your led strip, divide it by 12. That will give you the amps it draws.
Your battery will be rated in Ah. This is how many amps it can supply for one hour.
A 10Ah battery can supply 10A for one hour, or 1A for 10 hours etc.
Your battery will be rated in Ah. This is how many amps it can supply for one hour.
A 10Ah battery can supply 10A for one hour, or 1A for 10 hours etc.
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Except, as you know, in practice it's not quite as simple as that. If it was in good nick, you might get 1A for 10 hours, but you'd get quite a lot less than an hour at 10A. The 'Ah' rating should come with an indication of what discharge rate it relates to.
Kind Regards, John
Floor sockets.
Sockets for floors.
Sockets for floors.
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10W = around 0.8A at 12 volt so to run for 6 hours would need a battery
around the size shown. Dimensions: (L) 151mm x (W) 99mm x (H) 100mm it will also need recharging every day.
I would be looking at far less than 10W reading lamps on my bed head at 2W LED which is ample. However running 12 volt lamps from 12 volt batteries is not always as simple as it seems. Most lead acid batteries rated 12 volt start at around 13.4 and drop to 11.6 volt and some 12 volt lamps will be damaged at 13.4 volt. I wanted to fit GU5.3 LED spots in the caravan but the problem in finding which can take 13.4 volts means I have not done it.
I would be looking at far less than 10W reading lamps on my bed head at 2W LED which is ample. However running 12 volt lamps from 12 volt batteries is not always as simple as it seems. Most lead acid batteries rated 12 volt start at around 13.4 and drop to 11.6 volt and some 12 volt lamps will be damaged at 13.4 volt. I wanted to fit GU5.3 LED spots in the caravan but the problem in finding which can take 13.4 volts means I have not done it.
Found some 1.5w bulbs would that be any better?
I'm guessing they will be but website doesn't say
That's obviously crucial information, which you would need to discover before you bought anything.
Also, everyone seems to be assuming that you would be using fairly large re-chargeable batteries (like mini car batteries) - was that you plan/intention? I rather suspect not!)
Kind Regards, John
I was hoping to use maybe 3 or 4 D battery's
I feared as much! Re-chargeable or not? If they were not re-chargeable, you'd need 8 D cells for 12V, With rechargeable ones, you'd need 10. For 6V, halve those numbers.
Kind Regards, John
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I got some 0.58W GU10's which were useless but 1.8W candle was quite good better than an 8W CFL. So I would think 1.5W would be ample.
So at 10 hour rate 1.5W at 12 volt will need 1.25 Ah to last 10 hours it would seem closest would be 3200 mAh Dimensions (Width x Depth x Height) 67 x 134 x 66 mm. That should run the lamp for around 24 hours. Price about £15
Of course it will need recharging the CTEX XS 0.8 Compact 0.8a charging for mc and small batteries would likely best fit the bill likely cost around £37 lidi and Aldi do small battery chargers from time to time which are much cheaper but when they will next do them is anyone's guess.
You want it to look good so likely you will need a lamp to convert. We are looking at a table lamp which gives a reasonable output. However
At £21.60 these use three AA cells and look the part but would not work for long and will not be that bright the kind of thing you use when camping. It says it works for 36 hours on a set of batteries at 1200 mcd which is about 0.12 watts all it will do is glow it will not really light the table.
So at 10 hour rate 1.5W at 12 volt will need 1.25 Ah to last 10 hours it would seem closest would be 3200 mAh Dimensions (Width x Depth x Height) 67 x 134 x 66 mm. That should run the lamp for around 24 hours. Price about £15
Of course it will need recharging the CTEX XS 0.8 Compact 0.8a charging for mc and small batteries would likely best fit the bill likely cost around £37 lidi and Aldi do small battery chargers from time to time which are much cheaper but when they will next do them is anyone's guess.
You want it to look good so likely you will need a lamp to convert. We are looking at a table lamp which gives a reasonable output. However
My initial idea was to use a 1.5v bulb and use a refective case as these bulbs are only 0.3w and have 200ma draw but not sure how bright it would be. I would use maybe 3 D battery's to give a decent life span.
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