amund7
1 W
Hi all,
First post, sorry if it's in the wrong place.
I built my first E-bike last week:
I put a Magic Pie 3 on a downhill bike, bought a Li-Ion bottle battery from E-bay (48v/13Ah) (ad says 30A continous, 70A peak).
Bike runs great on a full battery, pulls 26A and is truly fun.
But after spending 1 Ah, amps is down to 20A, noticeably slower
After 2Ah - 18A, boring
After 5Ah - 15A
After 9Ah - 10A - I now have to push the bike home. At least pedal a lot.
Voltage is 55v at full and ending at about 46V after 9Ah, and around 2v loss under full load.
To eliminate temperature issues I once used 2Ah, parked the bike outside for 5 hours, then resumed. It pulled exactly 18A.
I was sure this was a battery problem. So today I tested my friend's Hobby King 10Ah 22.2V lipo's, 2 in series. Results are exactly the same, maybe a bit less amp loss per Ah, but very close to my ebay battery.
What's going on? Is there something wrong with my Magic Pie controller? Or is every E-bike like this?
The numbers come from a DealExtreme wattmeter, and from memory, but my problems started before I had any display, and the bike was getting drastically slower with a little use.
First post, sorry if it's in the wrong place.
I built my first E-bike last week:
I put a Magic Pie 3 on a downhill bike, bought a Li-Ion bottle battery from E-bay (48v/13Ah) (ad says 30A continous, 70A peak).
Bike runs great on a full battery, pulls 26A and is truly fun.
But after spending 1 Ah, amps is down to 20A, noticeably slower
After 2Ah - 18A, boring
After 5Ah - 15A
After 9Ah - 10A - I now have to push the bike home. At least pedal a lot.
Voltage is 55v at full and ending at about 46V after 9Ah, and around 2v loss under full load.
To eliminate temperature issues I once used 2Ah, parked the bike outside for 5 hours, then resumed. It pulled exactly 18A.
I was sure this was a battery problem. So today I tested my friend's Hobby King 10Ah 22.2V lipo's, 2 in series. Results are exactly the same, maybe a bit less amp loss per Ah, but very close to my ebay battery.
What's going on? Is there something wrong with my Magic Pie controller? Or is every E-bike like this?
The numbers come from a DealExtreme wattmeter, and from memory, but my problems started before I had any display, and the bike was getting drastically slower with a little use.