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  • How to Cheaply Increase the Top Speed of an Electric Bicycle

    Sorry, I no longer have the bike set up to be able to take a picture of it. It looks like you have a DC/DC converter that has 2 different inputs for different voltage ranges. ie attached picture. You will need to put the battery voltage into pins with the correct range(I presume its 20-60V) and then measure the voltage output from the output side(without anything connected to it). If you dont have a multimeter to do this, then setting this up correctly will be very hard. While measuring the voltage, adjust the voltage POT resistor until you get a voltage which is the maximum of your ebike input range. The other adjustment you'll have to make is the current limiting POT. For simplicity, you can just wind this to maximum. If you arent sure which way this is, its generally clockwise, but n...

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    Sorry, I no longer have the bike set up to be able to take a picture of it. It looks like you have a DC/DC converter that has 2 different inputs for different voltage ranges. ie attached picture. You will need to put the battery voltage into pins with the correct range(I presume its 20-60V) and then measure the voltage output from the output side(without anything connected to it). If you dont have a multimeter to do this, then setting this up correctly will be very hard. While measuring the voltage, adjust the voltage POT resistor until you get a voltage which is the maximum of your ebike input range. The other adjustment you'll have to make is the current limiting POT. For simplicity, you can just wind this to maximum. If you arent sure which way this is, its generally clockwise, but not always. You could set it mid-range, and then adjust higher once everything is working.Once you have the voltage set where you want it, and the current limit set to either half or maximum, then connect the power output from the DC/DC to the power input of the ebike(where the battery power normally went). If you can make it spin with the wheel off the ground then you have set it up correctly. If when riding it seems like the power backs off as soon as you try to accelerate, then this is probably the current limit kicking in. You should adjust that higher. You shouldnt be adjusting the voltage if you have set that correctly.If this doesnt work, post a simple block diagram of how you have set up the power, and I will see if I can spot the problem.

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  • How to Cheaply Increase the Top Speed of an Electric Bicycle

    You use the booster to increase the battery voltage coming into the bike. So you would place it between your battery pack, and your motor controller/rest of the bike. This way, the voltage the ebike sees is always the maximum allowable voltage, and you dont see any voltage sag from heavy use and battery discharge.

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  • Hand Sculpted 3D Settlers of Catan Tiles & Hand Crafted Box

    I'm into gaming, and know some people that do custom add-ons (all I've done is paint my Tzolk'n board). But as others have said, where do you place the numbers? What do you do with the robber? If you had kept a dedicated circle on each tile(especially the mountain tile) then that would make it workable.

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  • Elec_BM commented on Nematic!'s instructable Capacity Test Of Fake 186502 years ago
    Capacity Test Of Fake 18650

    Well yes, I'd spend that money buying better batteries instead of testing dodgy ones too. But if you work in electrical engineering, and already have access to that equipment.....Anyway, just letting you know it wasn't test method or circuit calculations that was giving you that result - it really is the batteries at fault.

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  • Elec_BM commented on Nematic!'s instructable Capacity Test of Fake 186502 years ago
    Capacity Test of Fake 18650

    I've used profession load banks (cost $1000+) to measure battery capacity of the Chinese ebay purchases and got the same result. They outright lie about the capacity, and don't seem to care about the repercussions (lets face it, what can you do?). The only solution I've found is to pay retail prices at a local store where you can take it back if its not up to scratch.

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  • How to cheaply increase the top speed of an electric bicycle

    Thanks for the praise. The highest speed I ever got was 45km/h (on a slightly downhill straight run) with a 55 volt input. If you are prepared to stress the components of your controller and motor, you could increase it up to 80 volts(with this DC/DC converter) with a top speed I would estimate over 60km/h. But this would be unsafe for the electronics, your health, and the safety of others on the road.As for the laws in my country, somehow full sized electric mopeds, with headlights and indicators, are legally sold. These clearly break the design rules that limit electric bike maximum power to 500W, so it doesnt seem like the laws on the books are being applied any more.

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  • How to cheaply increase the top speed of an electric bicycle

    You inspired me to look up the laws where I live. By doing this I break them too. I'd say its borderline to do any mods to any commercially sold products and still have it 'legal'.

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