Recent content by harrys

For a small motor. like the TSDZ2 in Eco/Tour mode, does a 14S-1P battery made with Molicel P42A's make sense? My TSDZ2 only pulls 8A max riding around with light assist, and peaks at 12A in turbo, according to my wattmeter. Looking at the discharge curves, the P42A will do at least 3.5AH at...

Here's some possibilities. Make Cell Capacity Weight Packing AH Weight Sanyo GA 3.5Ah 45 g 13S-5P 48V17.5 2925 Molicell P42A 4.2Ah 70 g 13S-4P 48V16.8 3640 Sanyo 50E 5.0Ah 70g 13S-3P 48V15.0 2730 The above is cell weights only. You'll have to see what your case and BMS weighs, plus the...

Google says 21700's are 300WH/kg while 18650's are 250W/kg. However, I see my Samsung 50E's are said to be 68-70 grams, while my 18650 GA's are 45-48 grams. Using the max capacity of 5WH and 3.5WH respectively, I'm calculating 260-280 WH/kg for both type of cells, no real advantage in weight...

Building wheels is not hard. What is hard is ordering the right size spokes. I know what the larkbox went thru, but I ate the cost. With doublewall rims, it's OK to have them a mm too long, as you can use washers.

Here's the PSWpower coaster brake option for 36V. There might be a 48V version. https://pswpower.com/products/europe-china-stock-tongsheng-36v-250w-350w-tsdz2-electric-bicycle-central-mid-motor-torque-sensor-with-coast-foot-brake-function-21 I've installed two 48V TSDZ2/TSDZ2B kits. Here's the...

I have a motor tester that tests the Hall sensors, so I count how many times they flash. You can also do it by feel, with two phase wire tied together. I'm dubious about that, because of the strength of cogging, but people say it works. By the way, I have an AKM 100 and mine is 12.5:1 gearing,

Sorry to be a grinch. Is it a sturdy frame bag? I think the vulnerability in these triangle batteries is that their weight makes them prone to damage if the battery falls off the bike. Unit Pack Power Triangle packs are now banned from sale in both the UK and USA because of fires (seven...

I use one of those inexpensive wattmeters between the battery and the controller. They can be variable in accuracy, but this one has been verified to be within 5% on current with my expensive clamp-on DC ammeter and also a fairly accurate load tester. I assume that if the current is close...

I was going to pursue this last year, but got sidetracked. My wife was unhappy with torque sensing on her TSDZ2B equipped bike. Not enough power. The embrusa/OSF allowed me to do a switch from Hybrid mode to Cadence mode in the field. She liked it immediately, and I was surprised at the...

No one has mentioned the Tong Sheng TSDZ2 mid drive kit with coaster brake option yet? I will. It's almost the same price as most hub motor kits. It doesn't need brake levers or throttle. Doesn't have the risk of snapping the forks like a front motor. I think it is very simple to install too...

Matthew has it right. Voltage sag will cause the bike to shut off when the nominal battery voltage is 42-44 volts, above the 40V cutoff you may expect. It's always there, and if you have the means to view it on your meter when riding, you can see the difference between being under power and...

I have installed several AKM100H's on 20" hubs with 20x2" tires. One bike has 8000 miles. I don't think I would go any smaller than than 100H for a 26" wheel, and would prefer the larger AKM128,

Are you running stock TSDZ2 firmware? The only time my throttle did not work was when I first loaded in the OSF firmware. I configured it wrong and had no throttle. Otherwise, it's always been active on both the kits I've installed, It works as long as you select one of the four assist modes...

Samsung 21700 cells in a 48V30AH battery would mean a 13x6 cell matrix assuming 5AH cells. A very nice battery, At 25A, each cell needs to provide only 4.1A, which is well within capability.

I've never seen more than 25A measuring with an peak current wattmeter from my first BBS02 from 2015. I believe Bafang has lowered the max current too on newer motors. I think a 35A BMS is more than enough.