Can we wire a second 12volt for charging on a motorcycle?

[georgewells]

Hello members, I am just wondering if we can add another one of the 12volts boxes to my grandsons CG bike and add a car battery in the carrying box on the back.
The reason behind this is that he races radio controlled cars that require recharging on site as they only run for around 20mins at any one time.
Thank You.
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A forum created by my grandsons friend.

[Kickstart]

Hi

Possible (assuming a later 12V cg), but a battery is heavy and will upset the handling if in a conventional top box high up and behind the rear wheel. Also not sure whether you expect the CG engine running to charge the battery, but compared to that required to charge a car battery (ie, presume what is needed to charge rc cars) in a reasonable time it is tiny.

All the best

Keith
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[georgewells]

Yes i think the motorcycle would need to be running, i only presumed the bike was a 12volts system is it possible its a 6volt system?
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https://www.chattinbubbles.co.uk/
A forum created by my grandsons friend.

[georgewells]

This motorcycle is F registered.
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https://www.chattinbubbles.co.uk/
A forum created by my grandsons friend.

[Kickstart]

Hi

At that age probably one of the Brazilian built ones and think they were 12V.

Suspect at idle it will barely charge the battery. No electric start so I doubt there is much excess charging capacity.

All the best

Keith
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[N cee thirty]

it was hard enough running the bikes lights on my old cg engine,never mind charging a car battery
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'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

Jewlio Iglesias wrote: I actually did vote BNP once

[ThoughtContro...]

A car battery is about 60Ah, which is 10 times the capacity of a 125 battery. The CG's charge current would be around an Amp absolute max (Any idea what the Reg/Rec is rated at Rob?). Even if you could divert all this to charging the Car battery and not keeping CG battery in topped up and good condition, as well as driving the CDI, Coil, lights, indicators etc, AND assuming you could charge at a constant current at 100% efficiency, it would take around 60 hours to charge the car battery (reality says multply that by 1.4 to 1.5). In petrol that would cost a fortune.

Carrying a car battery on a 125 is one thing, charging is completely impractical.

As an aside, what size and capacity packs is he charging that he's caning a car battery to empty?
A few years ago I used to go electric flying carrying a 17AH battery I scrounged, and 3x 7 cell 700mAH packs fully charged from home, and recharge the last used pack while he current one was taking me into the clouds. The big battery lasted me all day. Go Speed 400 soaring and crappy low capacity packs of yesteryear.
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[Kickstart]

Hi

To go with the above, the level of charge at idle and low speed will be far less than that at decent revs.

All the best

Keith
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[cb1rocket]

just take a portable 12v battery and use that. You can get several charges out of it before it goes dead

[N cee thirty]

can't remember the reg/rec rating

but the battery is rated at 2.5ah for the kickstart only models
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'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

Jewlio Iglesias wrote: I actually did vote BNP once

[Teflon-Mike]

The CG's electrical system has a single 4A fuse, I believe....
Sort of gives you an idea of the max load the entire system will handle.... ie about the tricke charge rate on a car battery....
It would take something like eight hours running the bike flat out, to charge a full size car battery.
However.
I used to race RC10's.
We used a car battery, and simply lugged it around in a plastic box.
It would normally charge the RC car batteries to keep a couple of cars running for an afternoon, and more than enough for the fleet of Sunday morning races, especially if you have three fully charged packs before you set off.
Make of mine has a C90, he used to carry a car battery on the luggage rack, to charge his RC's off, becouse that bike's 6v.
It was fun watching him wheelie it accross the rugby pitch..... it didn't do a lot for 'balence'.
Give the CG is 12v, TBH it probably has enough beef to charge the RC batteries on Paddock Charger, off it's own battery, if you set a fast idle, without having to add a big accumulator to the rack.... I'd give it a go and see.
Given the age of CG means it's kickstary, wont really hurt too much if the battery is flattened a bit, it wont need much juice to start it up again, doing it on a kicker.
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[stinkwheel]

What about a solar panel?

The technology is coming on in leaps and bounds these days. What is the charge rate for the RC car batteries?
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[Blue_SV650S]

As mentioned, charging the battery will be impracticable.

For the price of a car battery, your lad could get himself a few more race packs.

I would also not recommend a car battery high on the bike, the CoG will be very high, coupled with the fact the brakes are not all that great as it is - so he might crash and stuff!
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[Pete.]

Don't overload your lad's bike with a heavy battery placed high and to the rear. Buy him some spare RC batteries and have them charged and ready to go.
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good