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dynamo power output

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dynamo power output

Post by matt86 on Wed Nov 14 2012, 20:14

hello i have got a 110v dynamo i need to figure out how many bulbs i can use and what wattage bulbs to use .... how do i figure this out with the amps ? cant remember exactly but 18 springs to mind .... yes its a small dynamo .

Cheers , matt

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Re: dynamo power output

Post by nutgone on Wed Nov 14 2012, 22:24

Volts multiplied by amps equals watts.

If it is a 18 amp dynamo producing 110 Volts (sounds doubtful, that would be a bloody big one) it would produce 1980 Watts, or 1.98 Kilowatts.

As you say it's quite a small one, I doubt it's 18 amps, unless it's a 12 Volt one???

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Re: dynamo power output

Post by matt86 on Wed Nov 14 2012, 23:13

nutgone wrote:Volts multiplied by amps equals watts.

If it is a 18 amp dynamo producing 110 Volts (sounds doubtful, that would be a bloody big one) it would produce 1980 Watts, or 1.98 Kilowatts.

As you say it's quite a small one, I doubt it's 18 amps, unless it's a 12 Volt one???

It defiantly has 110V on the brass plate on the side or it might be 1.8 amps would that sound more like it ????

matt

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Re: dynamo power output

Post by nutgone on Wed Nov 14 2012, 23:35

It could be 1.8 amps, that would give you almost 200 watts, my Tarpen is 400 watts, at 110 volts, which makes it 3.6 amps. Doesn't sound a lot, but is good enough for a couple of Tarpen hedge cutters.

If this is the case, & it's 1.8 amps, then you'll be good for 3 60w light bulbs. Pretty much all the 110v bulbs available are site bulbs, these are what they call rough service, meaning they are built tougher than normal bulbs, they are almost all 60w as well.

Personally I would just run 2, to avoid giving the dynamo too much work (it's old, it should be enjoying it's retirement Very Happy ) but it should cope with 3.

The alternative would be to try & source some smaller wattage bulbs from somewhere, but they need to be filament bulbs, old style. (or halogen bulbs). Modern "compact flourescent" low energy ones won't work on a dynamo.

My Tarpen dynamo is quite large (you can see it on my thread) & only gives out 400 watts, as I said. But the next model of Tarpen generating set had a dynamo which was much smaller, perhaps half the physical size of the one on mine, but this still gave out 400 watts. So, what I'm trying to say is; the size of dynamos can be a bit confusing, as technology moved on very quickly during the war (as it always does in wars) & these things got ever smaller & more powerful. So a huge dynamo from, say, 1920 will probably only give out the same power as a much smaller one from, say, 1950. Difficult to tell from the actual size of the thing.

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Re: dynamo power output

Post by kevjhnsn on Thu Nov 15 2012, 01:53

2x 60 watt bulbs will be plenty to light up your engine and display bourd ,
for a night light up
kev

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Re: dynamo power output

Post by matt86 on Thu Nov 15 2012, 17:47

thanks matt .

I will go out and take a picture of it for you all to see , and one of the plate too .

matt

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Re: dynamo power output

Post by matt86 on Thu Nov 15 2012, 20:02

as promised a few pictures and yes it is a small dynamo !







and under closer inspection it is 1.8 amps Embarassed

matt


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Re: dynamo power output

Post by Ianhw77k on Thu Nov 15 2012, 20:09

matt86 wrote:
and under closer inspection it is 1.8 amps Embarassed

matt

and 200W Rolling Eyes

Nice little unit though, is it going on one of your open crankers?

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Re: dynamo power output

Post by matt86 on Thu Nov 15 2012, 20:27

i know i did kind of realise that once i have posted Embarassed Embarassed Embarassed

well it will go on whatever takes my fancy .... i have a smallish non steerable trolley that i thinking to mount the genny one one end then the lighting board on the other ..... think would look quite good .

Im not one for having a genny or a pump on a small frame pegged on the ground in a way the public have to bend down to have a close look whats going on in my mind .

but i have a nice fowler in bits it could be paired up with .

matt

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Re: dynamo power output

Post by mike d on Thu Nov 15 2012, 21:08

matt..
i have a whole load of amp and volt gauges which i want to sell
if you know any one that want some,i can give photos of them...
regards...mike...

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Re: dynamo power output

Post by matt86 on Thu Nov 15 2012, 21:15

mike d wrote:matt..
i have a whole load of amp and volt gauges which i want to sell
if you know any one that want some,i can give photos of them...
regards...mike...

like the ones i have had off you in the past mate ?

matt

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Re: dynamo power output

Post by mike d on Thu Nov 15 2012, 21:20

well theres more of them..but ive got loads of others..larger than you had...
there must be at least 10+ pairs...

me...

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Re: dynamo power output

Post by matt86 on Thu Nov 15 2012, 21:23

mike d wrote:well theres more of them..but ive got loads of others..larger than you had...
there must be at least 10+ pairs...

me...

If you had a 110 v one that would be usefull mate .... got a amp meter its just a volt meter mate ...

matt

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Re: dynamo power output

Post by mike d on Thu Nov 15 2012, 21:26

ya..they only register what goes through them..most of them go up to 300 to 500...
so should be fine..have a look when you get down on Saturday feller.....

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Re: dynamo power output

Post by Abes on Thu Nov 15 2012, 21:28

Need a large small scale amp meter if you've got any PM sent

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Re: dynamo power output

Post by mike d on Thu Nov 15 2012, 21:32

you have mail abes....
theres some big buggers there..nice and old as well...
look nice with an exhibit....

me...

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Re: dynamo power output

Post by nutgone on Thu Nov 15 2012, 22:10

I could do with a volt meter. Amp meters are a bit of a lottery, you really need ones with an internal shunt (this should be marked on them) otherwise it can be a bit of a pain setting them up.

Also, check the volt meter is DC if it's DC you want. I bought an AC one when I was a kid, & wasn't happy when my dad told me it wouldn't work on the Tarpen Crying or Very sad

But seriously, I would love a volt meter or two, if there is any left. Do I need to PM???

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Re: dynamo power output

Post by mike d on Thu Nov 15 2012, 22:12

heres whats on offer..loads to go...







let me know if there something you want...

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Re: dynamo power output

Post by matt86 on Fri Nov 16 2012, 14:57

that one at the bottom is a big bugger !

matt

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Re: dynamo power output

Post by Abes on Fri Nov 16 2012, 17:43

Its like the one ive got and they are big buggers lol

matt86 wrote:that one at the bottom is a big bugger !

matt

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