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you don't need as much as 1000W to pull a trailer with 100kgs load. The issue is to avoid running the motor outside its sweet zone. This Woosh Big Bear is fitted with a Bafang 36V 20A 250W BPM motor:

Bafang make those two motors differently, their 36V and 48V versions differ too. There are trade-offs, you should buy exactly what you need and avoid using the component outside its specifications. There are always trade off, there is no free lunch.

do you mean cheaper than the Bafang BBSes? Nothing is much cheaper. The Tongsheng bb motors have torque sensor and cost about 5% less than their Bafang competitors. However, the Bafang have bigger motor compared to the Tongsheng. Tongsheng has just brought out their TSDZ2B Turbo with the same...

the middle button with the plastic pin works like this: the pin keeps the SW2 contact open until a device is connected. When SW2 is open, the two 18V halves are not connected, the battery does not deliver anything. When a correct device is connected, the two leaves are connected with the middle...

that schematic diagram seems to show two packs of 18V in series. The charger has a high side and a low side (= two chargers), the SW2 connects the middle ground and activates the charger.

That's because your motor is not working in its sweetzone under 10mph, the yield drops, more battery turns into heat. There is a tool on the ebikes.ca website to simulate your motor. XF08 is a tiny bit beefier than XF07, for simulation, just use the XF07 in their library...

The RPM rating is confusing. There is no agreement between manufacturers for labelling. I much prefer Bafang winding code. We always make sure that the motors are at their best between 12mph and 15mph. That's because 12mph for climbing a moderate hill, 15mph for cruising. Maximum derestricted...

one MP in our corner of the world has a simple idea how to deal with the small boats and migrants in general. They should be given temporary NHS and national insurance number as soon as they claim refugee status. Let them find work and build a life. Later, when their case is looked at, those...

yes, form factor, MXUS XF08C: case diameter: 128mm, DWG22C: 156mm.

XF08 is too small, underpowered for use at 48v on a cargo bike. The small motors will overheat on long hills. You should upgrade the motor wheel to something like my DWG22C or SWX02 or Aikema 128.

start with the circumference of your tyre: 26" 35-559 1990 mm 40-559 2030 mm 47-559 2050 mm 50-559 2075 mm 54-559 2100 mm 57-559 2120 mm 60-559 2160 mm 37-590 2100 mm Assume you have 50-559 tyres, circumference 2.075m, speed: 201 RPM * 60 (minutes/hour) *...

Sack the useless pair Suella Braveman and Robert Jenrick.

Can you show again the picture of the pack you bought or talked about so we are talking about the same battery? 10s2p = 20 cells

My reply was linked to their 36v 6ah pack

For 10s1p, the first and last cells are linked to a single cell. The wires on that pack are attached to two cells. Besides, there is no 18650 6ah cells also the cells in that pack are unmarked. Bosch wouldn't use unmarked cells

the battery in the picture can't be a 36V. Look at where the red and black wires are soldered to.

we can't supply components (motor wheels, batteries, controllers, LCDs, sensors, cable looms etc) to individuals. That would make support a nightmare. We supply professionals with parts for out of warranty repairs though.

you have a traditional BMS, same as saneagle's. After an intial flow and the two packs arrived at more or less the same voltage after a while. If you have back to back FETs, there would not be an initial flow. Just to confirm, you measure the current flow between the two batteries, nothing to do...

The picture is from https://www.monolithicpower.com/en/battery-management-system-solution-module have you had one of those tiny BMSes? They run with just a couple of ICs and a couple of FETs. Andy is on holiday, he'll be back on Monday. I'll ask him to take a picture for you. edit: They have...

the key thing is to find out if you have back to back FETs on your battery packs. FETs conduct both ways because they have body-diodes but on a modern BMS (especially those small sized and without bleed resistors), it is usual to have back to back FETs like in the reference BMS circuitry I...