Joneser

Hi Dave, have found this Panasonic ,pack which weighs less than 2kg. http://www.alibaba.com/product-detail/OEM-Model-rear-rack-panasonic-cell_1777137418.html Does this look ok? Thanks Joneser

For non technical types like me it is difficult. Do panasonic sell 36V 5Ah (or other) e bike batteries with charger? hobbyking seems to be a bewildering list of cells but no packs ready to go.

Having googled Li NCM IT seems they are not as good because of voltage drop.

would be tempting to buy it all from BMS. I could go for a FSMTB pannier rack and fit a flat set on the rack in a bag. There are 3 options on BMS: Li-NiCoMn or Li-Ion NiCoMn or LiFePo4 The Li-NiCoMn is much lighter (2.5kg compared to 3.5kg). Good to choose on this basis?

Thanks Dave, On my q75 I use 2x6s a123's which have proved perfect for my commute. I guess the q100 will draw a bit more juice. Could you recommend a 3 to 4Ah pack? Cheers Joneser

Hi Dave, Thank you very much. You talk about rear motors, I was thinking front hub - did you refer to rears because that is what you would recommend for a FSMTB? Cheers Joneser

Hi, i may be remembered on this forum from a year ago when I did a q75 conversion. Quick update on that - its probably done about 12,000 miles and still going strong (although the motor is probably only on for 1/4 of that distance). I now want to do a full suspension mountain bike conversion. It's a decent aluminium frame. Has anyone used the Q100 with disc brakes please? Which Q100 type would you recommend for 26" MTB wheels? I'm thinking front hub for ease of installation and also ability to swap back to original wheel if I want to go off mountain biking without motor. Any tips from experience would be appreciated. Also is there anyway of achieving brake cut off using pneumatic brakes? Many thanks, Joneser

the only other thing is i redid the connections - added 3 pin mains plug and replaced battery and charger connections with Deans. But I guess it wouldn't have worked to start with if I had connected it wrongly.

About £150 including delivery (plus they would only accept bank transfer which was another 30 quid or something silly).

Well its all wrapped up in that blue stuff. Before asking Forzatec I thought I'd see if the forum had any ideas first. I guess if Forzatec ignore me I could try opening it up.

Well I finally got a saddlebag big enough for the 5Ah Forzatec battery so I tried it on my commute yesterday and it was a total flop - ran out half way into the easy leg of the commute. Charged it for 4 hours at work but it stayed at 15V so cycled home with no power. At least I have my A123's which are amazing little things.

Strange. Just trying to move this on an re-did the calculator and got a slightly different result: Complete wheel data Hub: q85, front Left flange ⌀: 108 mm Right flange ⌀: 108 mm Centre to left: 20 mm Centre to right: 20 mm Spoke hole ⌀: 3 mm Rim: Sun CR18 ERD ⌀: 340 mm OSB: 0 mm Size: Tension for 36 spokes CrossesSpoke length leftSpoke lenght rightTension ratio L/R 0116.2116.2100% 1120.8120.8100% 2133.2133.2100% 3150.3150.3100% 4168.9168.9100% Jerry so if I go for radial would you recommend knocking off 1.5mm (from the 116.2)?

"Or equally I could ease off a bit on the effort I put in, so the ride takes the same amount of time, but I'll be using loads less effort which will mean I'm fresher in the evenings or weekends to go on actual rides." The beauty for me is the flexibility. My commute is 10 miles with big long hills which I was doing on a hybrid (pre conversion) taking about an hour each way. It was OK when I was feeling up for it but 5 days a week, all conditions (weather and personal health) it was a bit gruelling. My fastest time was 50 minutes pre conversion. Now with my little Q75 and 2.3Ah battery I do it in about 50 minutes as a matter of course. I also find that I get still get a seriously good workout as its fun going really fast up steep hills, especially flying past lycra cyclists. And its been a godsend in the recent gales.

Genius. Ideal for winter time washing even if you do have an outside tap. Just don't use the expensive facial wash.

Hubs front Left flange 108⌀ Right flange 108⌀ Center to left flange 20 Center to right flange 20 Spoke hole 4.5⌀ Rims Sun CR18 ERD 340 OSB 0 Spokes 36 Crosses 1 Spoke length left 120.3 mm Spoke length right 120.3 mm I hope this is right! I note the Q85 spoke holes are about 3mm and the Sun CR18 rim holes are 4 or 4.5mm. Does this matter?

Hi my SJS 36 hole rim for Q85 Brompton conversion arrived today. I got the local bike shop to measure and lace my full size conversion but thought I might try this time. So questions - I'm not sure how accurate measurements need to be - how should I measure? Are some callipers best? Or has anyone already got Q85 measurements? I don't know why this info isn't provided with the motor! Cheers

Cycled in today and used 1.4Ah and the cells were only down to about 3.3V. Perfect! Brought my Turnigy in as I wanted to check something and it is happening again – one of the cells is charging faster (the same cell in each pack (why would that be)). They start off balanced but when they all get to about 3.4V one cell quickly charges to 3.6V and the other 5 take another half hour or so to catch up. This happens on both 6s battery packs (to the cell in the same location on each). Is this something to do with the Turnigy or the batteries. Whats going on!?

Thanks Dave. So with lifepo's bulk over charging is not a big deal but running them down should always be followed by balanced charging. That a fair summary? Jerry sorry for hi jacking your thread.

I have 2 cheap bulk chargers - 1 at work and 1 at home. They look the same. The one at home measures 41.4V using my cheap Volt meter. Assuming my charger at work is the same, why is it charging the batteries to 44.8V? Or maybe the charger at work is different and I should bring in my Volt meter to test it.

Now at home. Briefly, the journey home was into a strong headwind so I used the motor a lot more than usual. It used 2Ah and reduced the pack to 36V. So had just enough. So for my journey in to work when the battery didn't last, it couldn't have been charged fully. I'm balance charging them now with my Turnigy - 5 cells were about 3V and 1 cell was 3.2V And I need to work out how to use the CellLog 8M which arrived yesterday. Update: the second 6s pack were all between 3 and 3.12V so I assume all the cells are happy.

Thanks Dave I bought the meter that Jerry recommended which I think shows individual cell voltages. It arrived in the post today and is at home. I'll cycle home and then test them before charging.

So I reattached the charger and they quickly went back up to 44.8 Volts fully charged. Within seconds of full charge it started dropping again and is now down to 43.4V.

Charged them up as soon as I got in. Kept the watt meter attached and note that the volts are slowly dropping from full charge - now down to 40.47. Which makes me wonder if they were a bit flat this morning as I had charged them 36 hours earlier (used my manual fold up yesterday).

They are the 12C A123's. No I didn't balance them for this journey (but did for the one before that) - every time I have balanced them so far they are been virtually balanced already. Until today they have been perfect for my commute so I'm not giving up on them yet :-) Monitoring to continue...

Morning! Connected my watt meter for the commute for the first time this morning. Christmas party so stonking hangover so may not have peddled as hard up the hills as normal. The commute in is the more down hill stretch so was particularly surprised when the motor stopped working after 8 miles. Checked the watt meter which reported 1.5Ah but only 29V! What does this mean? I'm sure they were (nearly) fully charged. They have never showed signs of running out even on the way home (more uphill) previously.