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The eBike thread
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My bike is mostly just for using locally, commute occasionally, taking dog to park / canal. Not much in the way of hills here! I will have to be gentle with that 30A controller so as not to melt the nylon gears in that hub motor so!
Yeah back to the gears in the upgraded MAC motor, they are a much higher quality not sure what the material is but it definitely works.
The mac motors should be good at 2 Kw no problem if using the supplied controller which should have the soft start function.
Sure you can always add a little solder to that current shunt for more torque should you feel the need for some extra oomph !
No harm to experiment, You just need a decent battery.0 -
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Deleted User wrote: »Those old cells you will be using might only be good for 1 C and at that it could be pushing it.
They were all free. My aim is not to keep them healthy for years, but to actually use them. Hard.
Let's say the cells average just 2000mAh, then the pack with 4 in parallel will be 8Ah. Occasionally (not continuously) discharging at 2.5C for a few seconds at a time is certainly what I'm aiming for here, 20A. The kit is also rated 20A. That will give me almost 1200W
Deleted User wrote: »Eventually you'll see the light and go with RC LiPo, simple, compact and can really dish out the amps and no BMS to risk frying your battery lol.
Quite possibly, LOL! Any link to those cells at a reasonable price in your experience?My ads on adverts.ie:
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7S LiPo will give you 58.8 volts hot off the charger if charging to the max of 4.2 v per cell but 4.15 should be the max you go. You can set that in any half decent RC charger.
4 of these will give you 49.8 volts at 4.15 per cell and 10 Ah but 20C discharge. 12 S config, use the 30 amp Andersons and they are very simple to change to series/parallel for cycling and parallel for charging.
https://hobbyking.com/en_us/turnigy-5000mah-6s-20c-lipo-pack-w-xt-90.html
They can charge at 2C too so that means your 10 Ah pack can charge at 20 Amps or in 30 mins !
all for 171 Euro's , of course excluding postage and charger, balance leads etc.0 -
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TheMilkyPirate wrote: »I bought a Carrera vengeance e bike from Halfords about three months ago and I love it. Just on some hills it takes a good bit of effort and only does about 8-9kmh would be nice to get a bit more power. Is there any options to upgrade it?
Sure there is, an external controller and a lot or rewiring.
Your battery has to be up to the job though or it will have a short life.0 -
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Deleted User wrote: »7S LiPo will give you 58.8 volts hot off the charger if charging to the max of 4.2 v per cell but 4.15 should be the max you go. You can set that in any half decent RC charger.
4 of these will give you 49.8 volts at 4.15 per cell and 10 Ah but 20C discharge. 12 S config, use the 30 amp Andersons and they are very simple to change to series/parallel for cycling and parallel for charging.
https://hobbyking.com/en_us/turnigy-5000mah-6s-20c-lipo-pack-w-xt-90.html
They can charge at 2C too so that means your 10 Ah pack can charge at 20 Amps or in 30 mins !
The one you linked is 6S. Why do you recommend that over 7S?
The one I linked to is 7S, 2 in series is 14S * 4.2V = 58.8V fully charged. The also have the XT90 connector which can be easily connected in series and shrunk to XT60 at the other end, which is what I like. The one I linked to also has balance charger leads
I've trouble finding a 7S balance charger though. Any ideas? Or is that why you suggested the 6S in the first place? My ads on adverts.ie:
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[Deleted User] wrote: »Sure there is, an external controller and a lot or rewiring.
Your battery has to be up to the job though or it will have a short life.
Could you recommend a controller? Is there any good guides online or is it beyond the remit of a beginner?
Not even sure what battery is on mine tbh0 -
The one you linked is 6S. Why do you recommend that over 7S?
The one I linked to is 7S, 2 in series is 14S * 4.2V = 58.8V fully charged. The also have the XT90 connector which can be easily connected in series and shrunk to XT60 at the other end, which is what I like. The one I linked to also has balance charger leads
I've trouble finding a 7S balance charger though. Any ideas? Or is that why you suggested the 6S in the first place?
I think 6 S will be plenty unless you want to go over 30 mph ? + it's 20 Euro's or close to 20 Euro's cheaper per battery.
Should find it easy to get a 8 S charger, I'll have a look.
You need parallel JST-XH balance leads to have all 4 batteries connected for parallel charging/balancing. + of course you'll need to parallel all the charging leads but it's not hard to solder up a lead with 4 of the connectors you want, in fact they probably already have them on HK, I know they do parallel charging boards which are dead handy.0 -
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That USD189 7S charger has put me off 7S. I think I'll go with your recommendation of 6S, it seems just more common and practical and affordable, so are my above 3 links valid (to use with the 6S packs you linked to)?Deleted User wrote: »Maybe some voltage monitors for the field too.
Also, the controller Low Battery Cut off becomes even more important when not using a BMS , so for 12S LiPo this should be set to around 42 volts.
A BMS isn't the be all and end all and can cause a lot of problems too and even battery fires.
I have cheap voltage meters. Will stick one of them on the bike. Funny you mention BMS vs balance charger. I've done a good bit of research the last few days and I agree with you my preferred way would be balance charging over BMS. And I will use a very intelligent battery management system (me) to decide when to cut off the battery from the controller
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That USD189 7S charger has put me off 7S. I think I'll go with your recommendation of 6S, it seems just more common and practical and affordable, so are my above 3 links valid (to use with the 6S packs you linked to)?
I have cheap voltage meters. Will stick one of them on the bike. Funny you mention BMS vs balance charger. I've done a good bit of research the last few days and I agree with you my preferred way would be balance charging over BMS. And I will use a very intelligent battery management system (me) to decide when to cut off the battery from the controller
Exactly, the best BMS is yourself.
No you can only use the 6 S balance leads with 6S Battery leads but they should be easy to find and you just might find them on ebay U.K. or jsut get one of the parallel charging boards and they will usually have the XT60 power connectors you like to use which will save you making up battery leads.
One extremely important unintentional feature of the 30 amp Anderson connectors is they make very handy fuses, if you short a LiPo and can't split the wires again fast they will burst into flames, they can dish out such insane current they can actually fuse the wires together, so if this happens, immediately get the battery to a safe place outside.
I do not know how the XT 60 connectors react to shorts but the Andersons will simply Vaporise + the Andersons are dead easy to split apart and connect from series to parallel.0 -
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Deleted User wrote: »I'd be worried they might exceed the current rating on the leads when balancing.
There's no point when the 6X 6S leads should be handy enough got.
I can't see how a 1 to 2 splitter has a worse current rating than a 1 to 6 splitter, but if you can find me a link for the latter, I would very much appreciate it My ads on adverts.ie:
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![[Deleted User]](/applications/dashboard/design/images/defaulticon.png)
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