Announcement

**AZguy** · 01-24-2023, 12:50 PM

I would get a programming cable for the controller - display settings will only get you so far and reading the settings before and after you change things in the display might give better clue to what it's changing in the controller (if anything)

I don't see anything that would be concerning... BBS02 max is less than 30A, I forget what (think it's 25A tho)... display set to 30A likely won't do anything

The voltage setting most likely is just for the bar graph - these are seldom terribly accurate or even all that useful and if it doesn't have a 52V setting... well not much use.. I'd consider getting an external voltmeter minimally or better an amp-hour/watt-hour meter

If the serial communication voltage setting works fine at 3.3V I'd just leave it there - it's typically somewhere in between 3.3 and 5

**pbreezy** · 01-24-2023, 12:55 PM

25.4mph sounds pretty good for a 30T chainring. You’re likely maxing out the RPM of the motor.
Pretty sure the BBS02B has 16 poles, so I’d imagine that’s what “# of magnetics” means…

**bafanguser** · 01-24-2023, 03:44 PM

Originally posted by AZguy View Post

I would get a programming cable for the controller - display settings will only get you so far and reading the settings before and after you change things in the display might give better clue to what it's changing in the controller (if anything)

I don't see anything that would be concerning... BBS02 max is less than 30A, I forget what (think it's 25A tho)... display set to 30A likely won't do anything

The voltage setting most likely is just for the bar graph - these are seldom terribly accurate or even all that useful and if it doesn't have a 52V setting... well not much use.. I'd consider getting an external voltmeter minimally or better an amp-hour/watt-hour meter

If the serial communication voltage setting works fine at 3.3V I'd just leave it there - it's typically somewhere in between 3.3 and 5

Great, thanks for that info. I just ordered a programming cable. Is there any "go-to" software or pre-made programming settings I should look for? On that same note, I assume you can actually change the voltage in the programming then, to 52v?

As for the magnetics setting, should I change that, or leave it at its default of 1? It appears to go up to 99.

Any thoughts on the "current threshold" setting? Thanks.

**AZguy** · 01-24-2023, 05:09 PM

Originally posted by bafanguser View Post

Great, thanks for that info. I just ordered a programming cable. Is there any "go-to" software or pre-made programming settings I should look for? On that same note, I assume you can actually change the voltage in the programming then, to 52v?

As for the magnetics setting, should I change that, or leave it at its default of 1? It appears to go up to 99.

Any thoughts on the "current threshold" setting? Thanks.

If luna has one then the driver it likely better known but as long as you can sort out the driver any one should do fine.. I've even built them

Controller isn't going to care about the voltage setting that's usually just for the display showing battery level and since it doesn't have a setting for 52V, at 48V it will show full until shortly before it's getting pretty low... I'd just get a voltmeter or other gauge - I've got a amp-hour/watt-hour and that's best but even a voltmeter is super useful when the displays have a 48V setting

I'd just leave it at one

Don't know what the current threshold is but if you can see what it does in the controller then you'll know ;-}

**bafanguser** · 01-24-2023, 05:38 PM

Originally posted by AZguy View Post

I'd just get a voltmeter or other gauge - I've got a amp-hour/watt-hour and that's best but even a voltmeter is super useful when the displays have a 52V setting

So I've got a standard volt meter, which I used to measure the battery already, but an an in-line one would be handy. I do worry though that it would add a point of failure either from vibration (downhill mountain biking) or from water ingress. Do you happen to know of any XT-60 in-line volt meters you would recommend?

Does this voltage chart look fairly accurate to follow? https://electricbike.com/forum/filedata/fetch?id=44058 - I think common practice is to store the battery around 50-70%, and back off to recharge around 20%?

**AZguy** · 01-25-2023, 07:05 AM

Originally posted by bafanguser View Post

So I've got a standard volt meter, which I used to measure the battery already, but an an in-line one would be handy. I do worry though that it would add a point of failure either from vibration (downhill mountain biking) or from water ingress. Do you happen to know of any XT-60 in-line volt meters you would recommend?

Does this voltage chart look fairly accurate to follow? https://electricbike.com/forum/filedata/fetch?id=44058 - I think common practice is to store the battery around 50-70%, and back off to recharge around 20%?

I'm going to strongly disagree that a voltmeter is only useful for troubleshooting

After all, the bar graph on the display is just a crude voltmeter, just very poor resolution and if it's set for a 48V battery will only start to move at rest once the battery is already getting pretty low

I agree the voltage does "sag" while under load and the degree of sag depends on how much load but the resting voltage (the voltage after no load for a bit) is about the best way to monitor battery SOC (state-of-charge) if you don't have a amp-hour/watt-hour meter which is the "gold standard" for these Li-ion batteries. I also agree the charts are rough and initially voltage might be confusing however with time, getting used to checking the resting voltage from time to time, most folks will get accustomed to how the numbers relate to SOC and once a 52V is starting to show a resting voltage in the upper 40's it will start to drop more quickly and once in the mid-40's you are getting very low and ought to start riding very "thrifty"

A voltmeter doesn't go in line and draws next to nothing so it can be put anywhere in the system. I think the best would be to have an XT90S's (not the XT60 and the "S" for anti-spark) somewhere between the motor and the battery and just solder the voltmeter connection to the motor side of the connectors - the wires for the meter will be very small in comparison to the motor wires so will be easy to include together. If the voltmeter doesn't have a power switch I could see a case for putting one in-line but I wouldn't sweat it for an LCD meter, more for LED.

A amp-hour/watt-hour meter is a different animal and needs to have an inline shunt. Again if done properly shouldn't give concern. I put XT90S's on both sides of the shunt but that was just to facilitate motor removal (the connector on the downstream side of the shunt is close to the motor) for any motor servicing (e.g. relube).

Water ingress is a concern but everything, display, motor and battery share this concern so if you are going to improve water resisitance then I'd go about protecting everything including the voltmeter. XT90S's assembled well - I put dielectric grease between the soldered portions and the rear shell and then heat shrink over that - will be fine in all but the worst conditions and better than anything else IMO.

Another "trick" I did with the XT90S between the battery and motor is placing it near the top of the seat tube and mount a second battery cradle on the rear rack (first is on the down tube) and so I can carry a reserve and switching between them is silly easy, takes two or three seconds (click on them for larger):

Announcement

BSS02 - Control/Display Settings - Help

BSS02 - Control/Display Settings - Help

Comment

Comment

Comment

Comment

Comment

Comment