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What size power bank to charge CUx battery

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328isport
Posts: 10
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(@328isport)
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Joined: 2 months ago

Hi All,

Looking for help as despite having an ev bike electronics is not my strong suit!

I may have an issue with charging my bikes battery at work soon, the noise of the fan isn't ideal (in an office) and I think from a health and safety point of view it may become a problem.

So I'm looking for options to charge the bike in the car park. I use about 40% each way, so I'm looking for a power bank that would be capable of powering my charger for 1/2 a charge.

Am I right in saying the general power banks made for phones/laptops would not be capable of powering my charger?

What sort of power bank do you think I'd need?

 

 

 

 

 

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LHK
Posts: 85
 LHK
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Joined: 12 months ago

@328isport you would probably better off running the bike on an external battery pack rather than trying to charge your existing battery from another battery. There will be a lot of losses via an inverter and then again through your charger. Even an inverter is say 85% efficient so you will already need to make up that 15% loss by increasing your battery size.

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328isport
Posts: 10
Topic starter
(@328isport)
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Joined: 2 months ago

@LHK, thanks, are you saying I'd better with something like this?

https://www.jackery.com/pages/portable-power-stations

 

If not if you could give me an example so i can try to get my head round it 🙂

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LHK
 LHK
(@lhk)
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Posts: 85

@328isport what bike do you have. Just need to know what voltage your batteries run at. Either 60v or 72v nominal. 

I run an external 72v pack that plugs into the main positive and negative of the bike. I don’t connect both batteries at the same time though, although I believe you can as long as voltages are the same before connection. 

the external pack can then just be charged back up at home. It’s only a 10ah battery for my Tc max but gives me another 10 or so miles range. It could be made bigger if I wanted to. 

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328isport
Posts: 10
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(@328isport)
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Joined: 2 months ago

It's a CUx, battery says 60V 30AH on it. Sorry so are you suggesting I basically run a second battery, so when the main is getting low then i switch to the second? Issue is with the CUx is I'm limited space wise, there isn't space to run two batteries as I think there is in other models.

 

 

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LHK
 LHK
(@lhk)
Joined: 12 months ago

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Posts: 85

@328isport if you have space in a top box to put the battery. I’m guessing in the same space you were wanting to put your battery for charging via the inverter?

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328isport
Posts: 10
Topic starter
(@328isport)
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Joined: 2 months ago

@LHK no I don't run a top box, I have a small storage section under the seat which is big enough for my charger, I was hoping I could get a compact battery pack that I could put in there or in my backpack, tbh even a 20-30% charge would do, as that would see me home with around 40% left, I wouldn't want to get back with much less than that as find the performance drops off a reasonable amount.

In terms of a battery pack, am i right in saying the type designed for laptops etc would not be capable of supporting my charger? 

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