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Dirt Bike Brands - Other
Battery Pack/power Supply
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[QUOTE="JasonJ, post: 148262, member: 23758"] Your best bet I think is to get some good RC 7.2V race batt packs form Radio Shack. You can get NiMh packs with up to 3000 Mah capicity that will probably last you the whole weekend. Radio shack also sells 12V DC cahrgers for theese RC car packs. Keeping two batt packs with you should be more than enough, and you can have a 6V take off by puttng a lead on the 7th cell of the 8 cells to drop the 1.5 V. The problem with trying to charge or run stuff from your bike is the power is dirty. The voltage goes up and down as the bike revs and the power often has an AC ripple in it as is the nature of the magneto genarator. No big deal for the lights but a problem for sensitive electronics. You would need to filter the power to nice clean DC and then regulate the voltage. DC battaries are great for regulating the voltage as they will keep it up when the input is down (low RPM) and help drag the voltage down when it goes up, like a buffer. A voltage rectifier and or regulator can be made, but why not tear the components form an old car alternator? The rectifier regulator is usally built into a unit in the back of the alternator, the ones the charge wires come out of. 12V is ok charge voltage for 7.2V batt pack, and with the low input power form the bike, you shold not hurt it, but try to find regulateor with an adjustment to lower the V max to around 9v or so. Also, an AC to DC wall plug in adaptor could be used nice and small, light and cheap. Try to find a solid state switched type and not a transformer one. If you have an old computer power supply youve got a winner :) . The problem with a transformer is it has a set step down rate. So in the states we use 120 Vac in the house so a 9 to 1 step down is used to get the 16V or so ac to clip down to 12V DC for a 12V DC adaptor. The step down is consistant reguardless of the input, so if you put 10V AC into a 10 to 1 Xformer you get one volt ac on the secondary coil :( . This is not good for a varing input voltage range as is the case with the bike but works fine for regulated house line voltage. One other option is to use the radio shack charger itself for the job. If it can take the max input voltage and by its designe will filter and regulate the output. Use the charger with a 7.2V batt pack to make your mini powersupply. You will have to check the power out as I am not sure how good of a filter is in the charger as it is made to run from a 12V DC car system. You may have to make or by a full wave brige rectifier and a clipper to keep the input voltage down, You will have to mesure the max voltage the bike puts out a full throttle. A retifier is just 4 diodes aranged in a dimond config to turn AC to DC. Radio shack sells intigrated high current and High V ones for like 3 bucks. If I were you I would try the high capcity RC batt packs and see how long they run your stuff. If the durration is acceptable then just use the recargable packs and forget the on board charger. The duration of course depends on the avarage current draw of your avionics :) and the capicity of the cells used in the pack. The more expensive packs have larger capcity, the capcity rating is Mah, mili amp hours, and the Nicle Metal Hydroxide, NiMh cells are better thatn the Nicle Cadium, NiCad cells. Good luck :) . Hope that helps a bit. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
Battery Pack/power Supply
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