My first build

[xibriz]

I have an ordinary bike that I am verry pleased with, so I want to convert it to an ebike so I can commute to work. Including delivery of one child to the kindergarden.

This will be my route (total route from home back to home):


The first 7,5km will be with a child (20kg) on the bike.
Driver weight 110kg.

The budget = the equipment to get the job done.

I have been looking had BSS03 with a 48v 14ah Dolphin Battery. Will this get the job done?
Any other suggestions?

I am mechanically skilled so I'm happy to build my own bike to save money.

 

[dogman dan]

Yes, it will definitely do the job. Not sure what bike you will be using, but as the child grows the motor can be moved to a larger cargo bike if you need it.

 

[xibriz]

I dont have the exact model name at hand, but it's something like this:

 

[2old]

Where can you put a 20 kg (44 pound) child, who is probably growing, on there? Better locate a strong rack, better yet cargo bike.

 

[MikeT]

You might think about a child carrying trailer. It would be safer.

 

[xibriz]

.

 

[xibriz]

Where can you put a 20 kg (44 pound) child, who is probably growing, on there? Better locate a strong rack, better yet cargo bike.

In one of these:

 

[TheBeastie]

I have been looking had BSS03 with a 48v 14ah Dolphin Battery. Will this get the job done?
Any other suggestions?

Sometimes those dolphin battery packs are a bit exaggerated on the quality of cells etc, you should be able to do that trip even on crap cells in theory but that depends on how fast your expecting to go.. You should be able to do it at an average of 25km/h I would say..
Part of the problem is that 18650 packs that are 4P or less tend to only give their full rated Ah if there on low draw kits like a 250w kit.. You need 5P minimum 18650 pack if you want to draw a larger amount of amps and have the total expected Ah of the pack be discharged..
*Add/edit* A lot of tests have been down on 18650 cells that were rated for very high discharge that only give around 85% of their capacity if more then 4amps were drawn, but they always give their rated capacity when a more modest amperage was drown.

if you want to go faster (or have enough battery to charge for every 3rd trip) you might want to go for a bigger battery, I am thinking a framebag from em3ev or lunacycle or what ever the go is these days and a frame shaped battery.

 

[xibriz]

Thanks for your input. I do not mind charging it every day. I am a RC fanatic so maybe I buy something from Hobby King later on.

Just put an order at LunaCycle for $1350. It hurts in my pocket

I went for the 52v Panasonic Ebike Pack 11.5. Sould be OK i hope.

 

[gidooo]

Thanks for your input. I do not mind charging it every day. I am a RC fanatic so maybe I buy something from Hobby King later on.

Just put an order at LunaCycle for $1350. It hurts in my pocket

I went for the 52v Panasonic Ebike Pack 11.5. Sould be OK i hope.

How much does Luna charge shipping to Europe? I want to order BBSHD+ Battery kit to Slovenia.

 

[xibriz]

How much does Luna charge shipping to Europe? I want to order BBSHD+ Battery kit to Slovenia.

$122 to Norway.

Quite expensive, but the price on the motor and battery was reasonable.

UPDATE: Just got the message that Luna dont send any batteries outside USA and Canada.

 

[gidooo]

How much does Luna charge shipping to Europe? I want to order BBSHD+ Battery kit to Slovenia.

$122 to Norway.

Quite expensive, but the price on the motor and battery was reasonable.

UPDATE: Just got the message that Luna dont send any batteries outside USA and Canada.

tnx xibriz

 

[xibriz]

Sometimes those dolphin battery packs are a bit exaggerated on the quality of cells etc, you should be able to do that trip even on crap cells in theory but that depends on how fast your expecting to go.. You should be able to do it at an average of 25km/h I would say..
Part of the problem is that 18650 packs that are 4P or less tend to only give their full rated Ah if there on low draw kits like a 250w kit.. You need 5P minimum 18650 pack if you want to draw a larger amount of amps and have the total expected Ah of the pack be discharged..
*Add/edit* A lot of tests have been down on 18650 cells that were rated for very high discharge that only give around 85% of their capacity if more then 4amps were drawn, but they always give their rated capacity when a more modest amperage was drown.

if you want to go faster (or have enough battery to charge for every 3rd trip) you might want to go for a bigger battery, I am thinking a framebag from em3ev or lunacycle or what ever the go is these days and a frame shaped battery.

After some measurment I found that the Dolphin dont fit in the frame.
And after trying to order from Luna Cycle, I learned that they don't ship outside USA and Canada.

I am now looking at a frame (triangle) pack from em3ev.

Which one of these would fit my use best? I am not going off road, only on road.

50V 9P 18.9Ah with ICR18650-22 (NCM cell, 3C rated, approximately 2.1Ah) cell ($725)
50V 6P 18.9Ah with INR18650-32E (NCA Cell, 2C Max rated, approximately 3.15Ah) cell ($709)

 

[leo99]

If I were you I would go with the 50v 6p 32e cells since you will be only pulling 30amps with the bbshd. That pack can pull 38 amps and em3ev is pretty conservative when it comes to rating there batteries in addition, it will weight 30% less then the other pack and be smaller.

 

[xibriz]

Waiting for the parts got me into planning my second build already. You could call me hoocked after trying an ebike for the first time only one week ago.

I bought the 50V 6P 18.9Ah with INR18650-32E pack, but if I decide to do a second build, i cant affort such an expensive battery. The motor will be the same, BBSHD.

I plan to go for lipos. I have run lipos on my RC cars for quite some time, and know how to store, monitor and charge them.

The wife will get the "safe" pack.

But what I dont know is what would be the best configuration for the BBSHD.

I'm thinking two 6S 16Ah in series which would give me 44.4V of 16Ah.
Or three 5S 8Ah in series wich would give me 55.5V of 8Ah.

If 8Ah would not give me the milage needed I could double up in parallel.

What do you guys think?

 

[xibriz]

Ok, so I got the motor yesterday and started the build.

My first question: It seems that I need to have it in 4th gear or lower on the back wheel, or else the chain will hop off on the front gear. Is there any way to fix this?

Here are som pictures of the build:











View attachment 3

 

[d8veh]

I'm just a bit worried about your brakes, especially if you're going to be towing a child in a trailer down a hill. If it were my bike, I'd change the forks for some with a disc mount, and then fit a hydraulic disc brake. The brakes are only about 40 euros from Ebay. You should be able to get some used forks for about the same. The back brake isn't so important.

 

[xibriz]

I'm just a bit worried about your brakes, especially if you're going to be towing a child in a trailer down a hill. If it were my bike, I'd change the forks for some with a disc mount, and then fit a hydraulic disc brake. The brakes are only about 40 euros from Ebay. You should be able to get some used forks for about the same. The back brake isn't so important.

I will do a lot of testing before this bike will be the main commute bike. I have another bike with disc brakes in the front and back.. dont know if its hydraulic.