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Old 09-19-2013, 03:07 PM   #1
fnatic OP
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Not enough POWER CAPTAIN! I think...

Hey all,

Firstly I know this subject can be found with a google search, but the solution given is fit all electrics and test to see if battery is draining, if so turn some stuff off.

Doesn't help me much, basically I have a 2013 F800gs apart from heated grips, GPS (to be installed), HID Hi/Lo beam (35w each). That is all the juice I am using so far, I don't use heated clothing and won't be in the future, outdoor adventure junkie so I layer if its cold.

What I am currently undertaking is fitting some AUX lights, got BMW bracket ordered now just working out which ones. I have decided on Clearwater (know its expensive) but I ride a lot to work and at night. I am looking at their lights and their Wattage rating. I can fit the larger ERICA/Krista lights but the erica's are 60W each on high. So this brings me to my question (finally I KNOW!!!)

If I have grips, GPS, High beam and ericas on full (120W for Erica's) is that tooo much for the F800gs 400W alternator?

Could go Kristas at 70W high beam combined but if I can want as much light as I can pack into a single unit so the ERICA's are really what I am after....

Cheers for any input.


Got told was 150W to run the bike not sure how accurate that is.
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Old 09-19-2013, 03:22 PM   #2
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Assuming your 150w figure for running the bike is correct you should have no problem. That's a big assumption though, there's a lot going on in a modern fuel injected bike that uses power! Without an accurate figure it's always going to be guesswork.
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Old 09-19-2013, 03:33 PM   #3
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Do you have something else that is about the same power requirement? Like a car headlight - even one attached to a car? Then you can temporarily hook that up to your bike and measure the battery voltage with the load.

The alternative it simply to travel slower on your standard lights - the extra lights just mean you can travel faster (when they are on).
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Old 09-19-2013, 04:28 PM   #4
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What about your fuel pump? Surely that draws significant current?
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Old 09-19-2013, 07:28 PM   #5
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I've been told, several times, that these days, if the battery is a bit suss it is almost certain that it wont have the threshold power to start the engine & run the EFI.
So, your calculations need to be accurate.

Isn't it something like Watts = volts x amps? Total wattage is simply the sum of the wattage of each device? Nothing else to it?
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Old 09-19-2013, 07:45 PM   #6
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Quote:
Originally Posted by tripodtiger View Post
Isn't it something like Watts = volts x amps? Total wattage is simply the sum of the wattage of each device? Nothing else to it?
Yep.

When the EFI fuel pump runs flat out it is about 5 amps so 60 watts. But if you have a fuel pump controller it won't run flat out - it will run at part power to suit the engine demands.

But none of that will tell you if it will work on your bike.. run a voltmeter and you 'll know - no calculations, no errors.
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Old 09-19-2013, 07:51 PM   #7
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Quote:
Originally Posted by Warin View Post
The alternative it simply to travel slower on your standard lights - the extra lights just mean you can travel faster (when they are on).
That's true.
When you travel slower your lights last longer.

PS: The above comment may not actually help the OP.
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Old 09-19-2013, 08:44 PM   #8
neilaction
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Short answer is no, you won't have a problem.
If the alt is as you state a 400w unit, it is almost certainly designed to have some decent accessories, including lights, fitted.
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Old 09-19-2013, 09:29 PM   #9
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Tis a simple equation - look up ohms law.

http://www.ohmslawcalculator.com/ohm...calculator.php

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Old 09-19-2013, 10:01 PM   #10
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No need for Ohms law.
Just make sure the total load doesn't exceed the capacity of the alternator.
Both are expressed as watts.
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Old 09-19-2013, 10:12 PM   #11
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yeah some things have current draw expressed as amps, so the equation is handy if you want to add it all up.

i think the op will be right. worst can happen is a flat battery if the alternator cant keep up

went spotlighting one night on the farm with a 100w spottie bodged in to the 4 wheeler. didnt know the bike couldnt keep up till i rode it into a ditch, stalled it. wouldnt pull start, so it was a long walk back to the farmhouse
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Old 09-19-2013, 10:31 PM   #12
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Yeah it's really quite simple

Just add up ALL the devices using power
Headlight 55
Tail-light ? 15
Instrument lights 5
Etc etc etc

Add them up and they should come safely under the 400watts delivered.
Also remember they may claim 400 but really might be 380 for example.

If your sums add up to anything greater than 350 i would be cautious and maybe give it to a BMW dealer to wire it up.
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Old 09-19-2013, 10:33 PM   #13
fnatic OP
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Hey all thanks for the reply.

Agreed should be a very simple calculation. But have struggled to find anywhere that gives up any information on how much the bike needs power wise just to run. Fuel, Canbus system etc.. .....

Hi/Low beam 35W HID each so 70 Watts.
Grips 35W (so Im told)
GPS (not sure how much they draw when plugged in.)
AUX Lights

Lights + Grips + AUX Lights + GPS

If I knew how much juice was left from the alternator (even BMW doesn't seem to know, which is handy. or unable to tell me.... ..) would be an easy decission....

Have three options lights wise as far as power consumption goes, prefer to be able to ride hours on end without draining the battery.

Option 1: 48 Watts for pair Darlas
Option 2: 70 Watts for pair Kristas
Option 3: 120 Watts for pair of ERICAS

If I went Option 3 like I want: 120 + 35 + 70 + GPS (unknown) subtract from 400..

Good old maths states 175 Watts left for bike system and GPS. If I went with Option 2. I'd have 225 watts left.

All depends on how much juice the Bike needs for normal operation. Not going to be having AUX lights on for ages with bike idling. Perhaps easier to Go Option 1 or 2 and have Juice to spare. Not knowing bike specs on this sucks balls though...
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Old 09-19-2013, 10:50 PM   #14
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gps will be fuck all. mine is on a 1a fuse. 10w max
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Old 09-20-2013, 01:18 AM   #15
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Alternator is variable output , depending on RPM of the motor driving it too. (400W at high revs).
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