Help programming BBS02

[benpala]

Hello everyone,
New here!

First of sry for the bad english its not my first language. I've been reading a lot on the BBS programming topic. I'm currently modding two bikes with a BBS02 and a Sturmey Archer 3 speed Hub. Lots of long big hill in my area so i'm going for efficiency and range before speed. I'm planning to limit speed at around 30km/h (19mile/h)

i'm going into all of Luna's app setting before actually plugging in the motor and making some change and i have a couple of question about some setting.
My goal is to have a simple to operate bike (some possibly 1 or max 3 PAS lvl) and the Sturmey archer will be the deciding factor for speed and hill climbing. I'm looking to have a consistent power usage so i know always how much range i have (or close to)

Battery is to be determine (52 volt vs 48)

Here are the settings i don't understand :


Designated Assist Level : ? Does it restrict PAS to only one lvl the one i chose ?
Start Current in relation to Slow-Start ? Seems from the PDF instruction that Slow Start can't be low if Currents is low and in a low gear? Not sure i am reading it right.

I would love to have the motor use less power when on flat vs hill or decent(usually not pedalling on decent) so is the setting :
Keep Current ?? Should i set this to like 20% ? My understanding is that the current will go down to 20% if no more is needed to keep the current speed?

Thanks all for your input !!!
Cheers

[Diggs Ut]

Using less power on flats and downhill is one of the things the Bafang BBs are good at. You can read a post I did awhile back at how I program for that.

https://electricbike.com/forum/forum/builds/custom-ebike-motor-programming/bbshd-programming/39661-post-existing-bbshd-settings-here?p=132136#post132136

Have you read this guide? It will answer most of your questions.
https://electricbike-blog.com/2015/0...ing-the-bbs02/

[benpala]

Using less power on flats and downhill is one of the things the Bafang BBs are good at. You can read a post I did awhile back at how I program for that.

https://electricbike.com/forum/forum/builds/custom-ebike-motor-programming/bbshd-programming/39661-post-existing-bbshd-settings-here?p=132136#post132136

Have you read this guide? It will answer most of your questions.
https://electricbike-blog.com/2015/0...ing-the-bbs02/

Hi thanks for the response,
I've looked at your file, but I'm still not sure what does parameters do : (see picture)

Slow start is it 1 the slowest start ? or 8
+ can i have a slow start with a low initial current ? is it safe ?

Thanks

[Diggs Ut]

Slow Start at 1 is the slowest ramping up of power. You may feel the PAS is laggy at that setting. There should be no issues with low current along with a slow start although the article I linked above has some warnings. Tweak the numbers and see what works for you. I have saved 3-4 copies of my file as I tweaked different settings during the time I was experimenting with different things. Allowed to go back to where I was if I didn't like some changes I had made.

[benpala]

Slow Start at 1 is the slowest ramping up of power. You may feel the PAS is laggy at that setting. There should be no issues with low current along with a slow start although the article I linked above has some warnings. Tweak the numbers and see what works for you. I have saved 3-4 copies of my file as I tweaked different settings during the time I was experimenting with different things. Allowed to go back to where I was if I didn't like some changes I had made.

Ok so a 5% initial power with a slow-start of like 3 with my gearing, 44T to 22T with a Sturmey archer (so first gear is 75% ratio) should be safe on my big hills?
Should i go down to a Mythi-mini 30 Tooth Chain ring ?
Thanks

[Diggs Ut]

Should i go down to a Mythi-mini 30 Tooth Chain ring ?
Thanks

I can't answer that one. The 48T that came on the BBHSD wasn't enough so I am running a 52T Lekkie ring up front and would probably have a 60T if I could find one that fit correctly. Couldn't even imagine a 30T but I'm a long distance country cruiser.