Choosing a battery for Tongsheng 48v 750w

[Lee5005]

Hi all
After various holdups before halting my leap into ebikes I have now decided to get a Tongsheng 48v 750w from PSWPower.
(I can't believe it is only £225)
I know this is over the limit but I'm a 'big' man and thought the extra power will be useful, I don't plan going crazy with it.

My question is, what battery?
Can I just choose any 48v or does the 750w motor limit my options?
I was looking for minimum of 600Whr to give me some decent range, so at least 12.A/h.

Thanks in advance for any help.

 

[Andy-Mat]

Hi all
After various holdups before halting my leap into ebikes I have now decided to get a Tongsheng 48v 750w from PSWPower.
(I can't believe it is only £225)
I know this is over the limit but I'm a 'big' man and thought the extra power will be useful, I don't plan going crazy with it.

My question is, what battery?
Can I just choose any 48v or does the 750w motor limit my options?
I was looking for minimum of 600Whr to give me some decent range, so at least 12.A/h.

Thanks in advance for any help.

Please remember that the police everywhere are getting "cleverer" or "better informed" about e-bikes...... 250 watts is the maximum allowed in most countries, so they may simply confiscate and crush it, it being completely illegal......
If you injure someone while riding it, even if its technically not your fault, you may end up in some very hot water. Bikes are so quiet, pedestrians may step in the road, right in front of you, for example.
At least get it registered, insured and taxed as a Moped/Motorbike, that will put you on the right side of the law and hopefully someone else here can assist with getting that done...It's not very simple I am given to understand in the UK......
Where I live (Germany), its next to being completely impossible.
Best of luck in whatever you do,
Andy

 

[StuartsProjects]

If you injure someone while riding it, even if its technically not your fault, you may end up in some very hot water. Bikes are so quiet, pedestrians may step in the road, right in front of you, for example.

Happened to me yesterday, quiet road, 3 girls walked into the road in front of me without looking, mobile phones in hand of course.

I was shouted at for not being on a cyle path, but I was of course it being a road.

Whilst I may not have been at fault in the event of an accident, these days the ambulance chasing lawyers would look for any way to make a claim so they get their commision.

 

[Lee5005]

Thanks for the replies and I take on board your comments.
So in real terms, how much difference would i feel in performance if I used a 250w motor instead of 750w?

 

[Andy-Mat]

Thanks for the replies and I take on board your comments.
So in real terms, how much difference would i feel in performance if I used a 250w motor instead of 750w?

There are legal maximum speeds that an unregistered e-bike is allowed to reach:- 15.5 MPH in the UK, which is around 25 KMH, the speed limit for the whole of the present day EU. So we are all in the same "boat"....
I have only ridden about 5 or 6 different e-bikes (owned two), but on all of them, the assistance "tailed off" at those legal speeds.
An e-bike, exceeding the legal speed limit is VERY obvious to most people, especially the Police, and then one day, a PC taps you on the shoulder and asks you if he may try it out! You refuse him and he simply confiscates the bike for "Official" testing.
You are screwed either way.
Why take the chance?
But at the end of the day, its your own personal choice and money.
Guessing only, but I think many bikers would like a more powerful motor, one where the electronics is set up to still not exceed the allowed speed limit, just get there faster! But the law states categorically that only motors up to 250 watt are allowed......
On my previous e-bike, I was trying to see just how fast my Weimaraner bitch could run, on a very steep forest hill, and I exceeded 40KMH! It scared the life out of me, and since then I have nothing against the speed limits or motor power!
Try out a pedal bike, with a speedo on a steep hill (then you are not breaking the law!), but do wear all the right motorcycle clothing and helmet, and see if you like it or not!
regards
Andy

 

[Lee5005]

My thinking was not to go faster than the legal speed limit, just have more torque for hills etc.
But now I'm thinking just stick to 250w.
So if it is 250w motor will I need a 48v battery or just stick to the normal 36v?

 

[sjpt]

250w 36v motors can mainly be safely run at 48v, and you will get more torque. You need to make sure the controller is happy with 48v and set up to use it.

One important thing for the battery is its ability to deliver amps; this is correlated with its amp-hour capacity but high capacity does not guarantee high current delivery capability. A nominal 250w motor will go well above that at peak power; maybe even 750w. You will need a battery that can deliver 20amp peak; with the 750w motor you would have needed a battery that could deliver that continuously.

 

[vfr400]

For that motor, you need any 48v battery that can supply at least 20 amps continuously. Don't buy any battery that doesn't show that characteristic in the listing. Don't get confused by any mention of maximum current. Your looking for the word "continuous".

 

[Nealh]

£225 plus you might get caught for extra customs duties.

 

[Lee5005]

It is German stock so they stated no extra duties.
I've decided now to go with a 250w motor and 36v battery with as big A/Hr rating as I can afford.

 

[Peddlin' Pedro]

It is German stock so they stated no extra duties.
I've decided now to go with a 250w motor and 36v battery with as big A/Hr rating as I can afford.

Goods from Germany coming into the UK - from any seller - are still subject to VAT and processing costs if the seller hasn't registered with HMRC and dealt with the other shenanigans. You might get away with it, you might not. I've had orders for several hundred quid's worth of stuff sail through without any VAT but then been stung on a couple that only just tipped over the £135.00 duty threshold. Best bet is to budget based on having to pay the VAT and processing, then it's a nice surprise if you don't. Adds a bit of financial excitement to every order!

As for speed and power limits, 15.5mph is the max assisted limit, at which point the assistance needs to cut out but there's nothing to stop you going faster if your legs can manage it or on a downhill. Had a couple of roadies catch up with me and have a moan a few weeks back because I was doing 25mph downhill; I I asked if they thought the brakes were supposed to slam on automatically at 15.6mph. Got blank looks and muttering in response.

I'll be selling my 48V 750W TSDZ2 with some spares in a couple of weeks if you're interested. Will list it in the classifieds section.

 

[Lee5005]

LOL @ " Adds a bit of financial excitement to every order! "

I know what you mean about 15mph, I test rode a bike and could kept it over 15 mph for a while once I was assisted up to that speed. I loved how as I tired the assistance kicked back in.

How much might you want for your motor ?
I did say 250w now but you have me tempted

 

[Peddlin' Pedro]

How much might you want for your motor ?
I did say 250w now but you have me tempted

I hadn't got that far, and no idea what the going rate is for a used TSDZ2. Let me have a think and I'll get back to you. I need to check the forum rules for selling too as don't want to break form

 

[Lee5005]

Thanks.
ps I'd not ask you to break any forum rules but I'm definitely very interested.

 

[vfr400]

I hadn't got that far, and no idea what the going rate is for a used TSDZ2. Let me have a think and I'll get back to you. I need to check the forum rules for selling too as don't want to break form

There are no forum rules on private sales other than the general no spamming.

 

[vidtek]

When I collided with a lamp post after a cat ran across my path in a small cycle track at about 10mph, that is when I realized 15mph is plenty for me. The lamp post came off considerably better than I, it was not even scratched. Took me 8 hours in casualty, no broken bones but lots of contusions. 15mph is more than fast enough for this old fart.

 

[Lee5005]

Sorry to hear that, sounds nasty.

As I recently said, I'm not looking to go over 15mph. My initial thought was more torque etc for hills and pulling away. Which now leaves me a choice to make

 

[vfr400]

If you're going with a kit and you want the most power that you can get legally, get the special high torque Bafang BBS01 kit from Brighton bikes:

Bafang BBS01B-ETM (MM G430.250) 36V 250W motor kit

Bafang BBS01B-ETM 36V 250W mid-drive complete conversion kit including LG MH1 cell battery

www.brightonebikes.co.uk

Another good choice (my preference) would be the 48v hub-motor kit from Woosh, which would be slightly more powerful, more durable, gives a better ride than a crank motor and £100 cheaper - if they have stock.

Woosh hub kits | Electric Bike Conversion Kits from Woosh

Woosh range of hub kits with choice of front or rear hub motors. Convert your bike into an electric bike.

wooshbikes.co.uk

 

[vidtek]

Sorry to hear that, sounds nasty.

As I recently said, I'm not looking to go over 15mph. My initial thought was more torque etc for hills and pulling away. Which now leaves me a choice to make

You said you are a larger person, so will need some torque to get going. I find as I get older I use my throttle for starting more and more unless down an incline. A snappy start from lights on the road is also a much safer start than a slow drag away with boy (and girl) racers chafing at the bit behind in their VW golfs. My kit does exactly that for me, but as it is a mid-drive I actually have to put in some effort when riding without using the throttle. That has enabled me to lose nearly 5 kilos in the last 6 months.

It's all about choice. I couldn't get on with my Sunbear which was a front hub motor, the Freego Eagle rear hub was much better, but I just love my mid-drive kit, it's so natural.

 

[Lee5005]

Thanks for the replies.
I was 50/50 on Bafang or Tongsheng.
Bafang has more power and is better established but I like the idea of the torque sensor on Tongsheng making it feel more natural.
I still want to pedal, use it for fitness as well as transport.