side car battery


Information and questions on GL1100 Goldwings (1980-1983)
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tegid
Posts: 31
Joined: Tue Feb 26, 2019 11:14 am
Location: France
Motorcycle: Goldwing gl1100 1983 with sidecar jeaniel
BMW K75 1985

side car battery

Post by tegid »



At the moment I have a battery slung between the Wing and the side car - open to all weathers etc. I am in the process of rewiring the sidecar, now mostly complete, but the last step must be to displace the battery to the trunk (boot, coffre) of the side.
Thanks to scrapping a couple of vehicles I have a few batteries at hand. Highest rating being a 52Ah 470A
My questions:
Is there a limit to the size of the battery I can use - at the moment it is a 35Ah 300A ; to my mind the battery trickle charges but the only problem would come if the battery is almost dead - could this burn out the alternator ?
Being one of life’s pessimists I am wiring the side so it is relatively easy to separate the side from the wing in case of major repairs. What gauge cable would you recommend for the cable to the battery and is there a detectable connecter for such a cable.
Best regards in these troubled times.
Teg


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Rambozo
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Re: side car battery

Post by Rambozo »

Andersen power products makes great high power connectors. Use a wire gauge as large as what was used on the stock battery or larger.
No problem with a larger battery.
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tegid
Posts: 31
Joined: Tue Feb 26, 2019 11:14 am
Location: France
Motorcycle: Goldwing gl1100 1983 with sidecar jeaniel
BMW K75 1985

Re: side car battery

Post by tegid »

Finally I got to checking the existing cable sizes to the battery. The diameter of a bare cable is about 5 mm which I would guess to be AWG 4; is this excessive and if so could I use a lighter more flexible cable into the sidecar ? The 52Ah 470A battery I have is almost new,it would fit nicely into the sidecar and connected to the battery with AWG 4 or 5 - does this sound about ok ?
best wishes
Teg
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WingAdmin
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Re: side car battery

Post by WingAdmin »

The stator in the GL1100 already produces full power at all times - it is not a regulator that adjusts its output. Any power produced that is not required is dumped as heat by the regulator/rectifier.

So you can safely put any size battery in there, and it will not overload the stator. The battery would draw at most the maximum amount capable of being produced by the stator (and not being used to run the bike/headlight/etc). Doing so means the regulator just doesn't have to work as hard getting rid of the extra unused power, in this case that power would be going into the battery.
User avatar
tegid
Posts: 31
Joined: Tue Feb 26, 2019 11:14 am
Location: France
Motorcycle: Goldwing gl1100 1983 with sidecar jeaniel
BMW K75 1985

Re: side car battery

Post by tegid »

Thanks for the info on the battery WingAdmin - the older I get the more there is to learn !
On the subject of the cable - from a little research it seems that the current draw by the starter is about 30 - 40 amps and possibly an initial peak of twice that. The existing cable is AWG4, is there any problem with reducing this to AWG6 ? Moving the battery involves an extention to the cable of about 4 to 5 feet. I haven't checked on prices as yet, but from a technical point of view could I drop the cable size ? A lighter cable could be a little more flexible to pass through the side.
Teg
froche
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Motorcycle: 1985 Goldwing Aspencade (GL1200A)
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Former bikes;
2000 R1100RT
2005 Suzuki Bandit
1979 Yamaha XS1100
1978 Yamaha XS1100 Special
1990 Yamaha XV250
1980 Yamaha XV750
1979 Honda CB750
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1973 Honda CB450
1968 Harley Davidson Sportster
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Re: side car battery

Post by froche »

Don't forget you can use smaller gauge wire and double it (double 6 is about equal to 3 gauge, triple 8 is about equal to 3 gauge) triple it etc. That way you can have more flexibility in the wire. Also you can purchase extra flexibility wire where the stranded wire is made up of far smaller wire twisted into the final size than regular primary wire.


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