Hey all,
Not having much luck with my 1000w Cyclotricity Stealth of late :-(
Had the original 48V battery replaced by Cyclotricity at 11 months from new due to going high impedance. New battery arrived and worked just fine for last 3 months (albeit very little usage, probably 5-10 charge cycles).
Went out for a ride, maybe used 50% battery, came back and plugged the charger in but didn't get the usual orange light showing on the charger (just stayed green)?? Left overnight and in the morning it was the same with only 2 bars showing on the LCD. Bike still worked OK, power going to motor etc.
Measured the voltage coming out of the charger and it was about 11v and unstable. Great, I thought...dead charger. Bought a new charger with a super spanking 54.5V on it's o/p and plugged it in. LED on charger still stayed green. WTF! Checked o/p voltage again and correct at 54.5V
Checked the voltage on the jack on the battery itself and was reading 50.8V, which sounds about right. It just won't take any current from the charger.
OK, must be a BMS problem I thought. Knowing Cyclotricity wouldn't extend the original warranty past 12 months I set about opening up the battery. This was a total bitch as they glue the plastic casings to the cells. Finally got it apart to expose the BMS module.
It looks like there are two FETS's control the charging (HY1807) and 4 to do the discharge (HY4008). The FETS all seem to measure fine and I can't see any bad solder joints / burned components etc.
It's defo not charging the battery though. With the charger plugged in, I can measure 54.5V on the C- terminal but only 50.8V on the B- terminal. The P- terminal has 50.8V on it with the battery enable switch on and nothing with the switch off, just as you would expect. Measuring down all the small signal wires they go up in voltage incrementally in 3.9V steps as you move along each pin:
1 - 3.91V
2 - 7.28V (3.91V)
3 - 11.73V (3.91V)
4 - 15.64V (3.91V)
5 - 19.55V (3.91V)
6 - 23.46V (3.91V)
7 - 27.37V (3.91V)
8 - 31.28V (3.91V)
9 - 35.19V (3.91V)
10 - 39.10V (3.91V)
11 - 43.00V (3.90V)
12 - 46.92V (3.92V)
13 - 50.82V (3.90V)
I also disconnected the multi-way signal connector and plugged it back in the hope of some kind of 'reset' but alas still no charge voltage on the battery.
I'm not really sure where to go from here. Any ideas?
Not having much luck with my 1000w Cyclotricity Stealth of late :-(
Had the original 48V battery replaced by Cyclotricity at 11 months from new due to going high impedance. New battery arrived and worked just fine for last 3 months (albeit very little usage, probably 5-10 charge cycles).
Went out for a ride, maybe used 50% battery, came back and plugged the charger in but didn't get the usual orange light showing on the charger (just stayed green)?? Left overnight and in the morning it was the same with only 2 bars showing on the LCD. Bike still worked OK, power going to motor etc.
Measured the voltage coming out of the charger and it was about 11v and unstable. Great, I thought...dead charger. Bought a new charger with a super spanking 54.5V on it's o/p and plugged it in. LED on charger still stayed green. WTF! Checked o/p voltage again and correct at 54.5V
Checked the voltage on the jack on the battery itself and was reading 50.8V, which sounds about right. It just won't take any current from the charger.
OK, must be a BMS problem I thought. Knowing Cyclotricity wouldn't extend the original warranty past 12 months I set about opening up the battery. This was a total bitch as they glue the plastic casings to the cells. Finally got it apart to expose the BMS module.
It looks like there are two FETS's control the charging (HY1807) and 4 to do the discharge (HY4008). The FETS all seem to measure fine and I can't see any bad solder joints / burned components etc.
It's defo not charging the battery though. With the charger plugged in, I can measure 54.5V on the C- terminal but only 50.8V on the B- terminal. The P- terminal has 50.8V on it with the battery enable switch on and nothing with the switch off, just as you would expect. Measuring down all the small signal wires they go up in voltage incrementally in 3.9V steps as you move along each pin:
1 - 3.91V
2 - 7.28V (3.91V)
3 - 11.73V (3.91V)
4 - 15.64V (3.91V)
5 - 19.55V (3.91V)
6 - 23.46V (3.91V)
7 - 27.37V (3.91V)
8 - 31.28V (3.91V)
9 - 35.19V (3.91V)
10 - 39.10V (3.91V)
11 - 43.00V (3.90V)
12 - 46.92V (3.92V)
13 - 50.82V (3.90V)
I also disconnected the multi-way signal connector and plugged it back in the hope of some kind of 'reset' but alas still no charge voltage on the battery.
I'm not really sure where to go from here. Any ideas?
