New batterries arrived yesterdaY 
Two 3s 5000mah Zippys.
Both came charged at 3.85v and balanced to within 10mv (4mv on the second) so did a quick charge to 4.16v and let them rest for a few hours. Still both within 10mv balance so looks like good packs (a few discharge cycles will confirm).
Made a parallel harness for them and filed the battery box so I have two "outputs" on the outside of the box - one for the 44.4v 10ah pack and one for the new 11.1v 10ah pack. Series connector then connects these two and feeds into the controller. Happey to say the batteries fit in the box perfectly - so that's now a 55.5v 10Ah lipo pack plus 7.4v 6Ah pack for the bike lights - nice and neat (photo coming soon). I then plugged the laptop into the controller and lowered the amp limit to 12a which should give around 725watts peak on the motor.
So, how does a 55.5v pack (63v fully charged) perform on a Tongxin? Brilliantly Into the promenade headwind this morning with me pedalling I was cruising at around 22/23mph. With the wind to the side the speed eased up to 25mph so that's bang on where I expected it to be. My 9.2mile commute dropped from 30 mins to 24 mins with an avg speed of 23mph (I love only having one set of traffic lights on my commute ). Used 4.1Ah and 235 watts so that 25.5wh/mile and it showed 730 watts peak on the meter. Excellent - as the wind will be beind me on the way home the amp/watt usage will be less so I'm still on course to meet my 80% pack usage per commute target (obviously adding the 11.v 10AH pack added another 110w/h energy to the overall pack).
Very happy - must just remember to pedal any time I see a copper and make sure I don't run anyone over who walks out of thier garden path
Any bets how much longer the motor is going to last? It has 800 miles on it now - confirming what I thought at the beginning - it isn't volts that kills Tongxins - it's amps and pulling away from a standstill (and associated clutch slip).
Two 3s 5000mah Zippys.Both came charged at 3.85v and balanced to within 10mv (4mv on the second) so did a quick charge to 4.16v and let them rest for a few hours. Still both within 10mv balance so looks like good packs (a few discharge cycles will confirm).
Made a parallel harness for them and filed the battery box so I have two "outputs" on the outside of the box - one for the 44.4v 10ah pack and one for the new 11.1v 10ah pack. Series connector then connects these two and feeds into the controller. Happey to say the batteries fit in the box perfectly - so that's now a 55.5v 10Ah lipo pack plus 7.4v 6Ah pack for the bike lights - nice and neat (photo coming soon). I then plugged the laptop into the controller and lowered the amp limit to 12a which should give around 725watts peak on the motor.
So, how does a 55.5v pack (63v fully charged) perform on a Tongxin? Brilliantly
Into the promenade headwind this morning with me pedalling I was cruising at around 22/23mph. With the wind to the side the speed eased up to 25mph so that's bang on where I expected it to be. My 9.2mile commute dropped from 30 mins to 24 mins with an avg speed of 23mph (I love only having one set of traffic lights on my commute ). Used 4.1Ah and 235 watts so that 25.5wh/mile and it showed 730 watts peak on the meter. Excellent - as the wind will be beind me on the way home the amp/watt usage will be less so I'm still on course to meet my 80% pack usage per commute target (obviously adding the 11.v 10AH pack added another 110w/h energy to the overall pack).Very happy - must just remember to pedal any time I see a copper and make sure I don't run anyone over who walks out of thier garden path
Any bets how much longer the motor is going to last? It has 800 miles on it now - confirming what I thought at the beginning - it isn't volts that kills Tongxins - it's amps and pulling away from a standstill (and associated clutch slip).
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