anchor light

[Johnjo]

Hi all,
being bit of a thicko where electronics is concerned!
can someone please explain in simple terms, being looking at a automatic anchor lamp,
power consumption is quoted as > 3/4 amp hour, which it says will run continuously for
1000 hours before discharging a 80 amp hour battery,
consumes 0.074 amps at 12 volts.
As I say being a bit slow on the uptake how can a light using 3/4 amps a hourlast for 1000 hours
when the battery only holds 80 amps ?

mike

<hr width=100% size=1><P ID="edit"><FONT SIZE=-1>Edited by mike27 on 21/04/2003 19:23 (server time).</FONT></P>

 

[Gezzer]

Does it consume 3/4 amp hour (0.75) or is it 0.075 you have stated both, It makes a big difference, 106 hrs battery life for .75 a/h Vs 1006 hrs for 0.075 ah for 80 amp hour battery.
I guess you are tal;king about the mega light, I seem to remember that the stated consumption of that is 0.075 a/h, I hope so because I have just ordered one

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[Johnjo]

Im quoting what it says in the catalogue,
with a current draw of less than3/4 amp hour they will run all night continuously for 1000 hours
before discharging a 80amp hour battery,
goes on to say, consumes only 0.074 amps at 12 volts.
Its the "Utility anchor light" advertised in the "Force 4 catalogue"
sorry I can only quote what the catalogue says!!

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[Johnjo]

can be viewed under nav lights at " www.force4.co.uk


<hr width=100% size=1><P ID="edit"><FONT SIZE=-1>Edited by mike27 on 21/04/2003 19:41 (server time).</FONT></P>

 

[Gezzer]

Yes thats exactly what I have just ordered from Seamark & Nunn, they seem to have got their decimal points mixed up in the description.

If it does indeed consume only 0.074 amp it will run for over a 1000 hrs (in theory) from an 80 amp hour battery, the calculation is simply battery capacity / load consumption.

If however it consumes the 3/4 amp figure then the battery will only power it for 100 hrs ish,.

When I get mine I will put it on a meter to test actual consumption and let you know the results if you are interested

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[Johnjo]

Thanks Gezzer.
It makes a lot more sense to me now ! as you say it seems as though
they got their decimal points mixed up, mixed me up as well !

regards mike

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[bedouin]

The amp hour is a unit of energy (or more correctly charge I suppose), rather than current or power, so saying the lamp uses 3/4 Ah only makes sense if a time is given. With the figures you give, I would guess that they mean that it uses 3/4 Ah per night (roughly 0.074 x 12 - depending how long your nights are)

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[gary_yank]

I have had one for two seasons and I like it. The consumption is about 3/4 amp/hr
a night. Use the brighter bulb of the two, the other is for other uses and is on the dim side for an anchor light.

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[roger]

An alternative

Buy a solar powered garden light. Mine cost £8 and has two yellow diodes. It is bright enough to see but probably isnt legal. It takes nothing at all out of the battery.
One such lamp, passed on to a friend, seems to have protected his boat which is mmored on the Dart from passing idiots who caused damage in the past.

<hr width=100% size=1>Roger

 

[Johnjo]

Yes this is exactly why I want it, Afraid some prat is going to collide with her when
she is on the mooring!
spent a couple of nights recently on board on the mooring, not nice hearing boats pass by at speed only a few feet away in the middle of the night!!!!

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