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Error 23 is usually caused by the motor cable connector not fully inserted. You need to push the motor end of the connector which is about 20cm from the wheel axle until the circle imprinted on it meets the lip of the controller end of the connector. Let me know if you need a closeup picture.

No, the TSDZ2B Turbo I ordered is a 250W version with EN15194 that Tongsheng makes for me. I don't sell 750W kits. I don't sell BBS02 nor BBSHD from Bafang.

I am only interested in 250W motors, so underpower is not a big issue. As for toseven making hub motors for years, they have no presence in the UK, no history on the net. It's a totally unknown brand. Like most resellers, I am of course interested in new products but in bread and butter terms...

e-scoots as parisians call them. They are a menace to pedestrians and car drivers. One minute they are on the pavement, the next they are on the road and quite often, you are not aware nor hear them coming up from behind. Half of the times, they are left strewn on the pavement, nobody cares...

that's a tricky situation.

I got 3 jabs, 3 different makes, caught covid 3 times. All very mild, no worse than a bad cold. Guess I would never know if the vaccines are worth the hype.

The logic of an BMS is the charging current will always be higher than the balancing current. It follows from that if you charge your battery until the current is zero, the balancing job is done. Unless you have a BT enabled BMS, you can't reprogram its settings so charging at lower voltage is...

so they burned through $144 millions (creditors money) + $180 millions (their own money) = $324 million on one bike design, 200,000 bikes? Unbelievable.

the bigger capacity you have, the less benefit you'll get from charging at 40V or 41V. One full charge 36V 19.2AH = 55 miles. 2,000 miles a year = 36 full cycle charges. At that rate, there is no benefit to you because you may not live long enough (41 more years) to see the difference.

can you do CC and CV from your PSU?

in that article by BMZ on the Samsung ICR18650-26F, the benefit of 4.1V charging begins to be noticeable from over 1500 full cycle discharge. Most e-bikers would use much less than 100 full cycles a year, about 5,000 miles a year from a 36V 15AH battery (full cycle discharges are cumulative, one...

it's only an issue if you need to charge at well under 4.2V per cell. Let's say you use a 42V charger with the output specified as 42V +/-0.1V. The amount of extra charge charge between 41.9V and 42V is very small. Saneagle used his programmable PSU to illustrate that point.

I did that sort of thing 7-8 years ago. Back in those days, welding sometimes failed. Really there is no need to worry about modern batteries made with Panasonic or Samsung cells. You can leave the battery in storage the whole year and see nothing special. The packs are not serviceable nowadays...

the balancing function does not have to be triggered at precisely 41.8V. A lot of battery control ICs check the voltages of individual banks all the time. When any bank shows a difference in voltage with its adjacent bank more than a set value (eg 35mV), the balancing function is triggered until...

why do you need a 0.01% accuracy for your bike? You only need a relative, not absolute, accuracy for most application. If you measure for example the output voltage of your battery in an hour or two, the error bias is the same, you compare the reading with previous readings, the difference does...

Most of the time, the measurements are on the same target device, a battery for example, so they are differential in nature. It's similar to using a tare. As far as I can see, a true RMS DVM with full 4 digit reading is good enough without needing calibration.

they all go wrong when the battery is flat, not only the cheap or analog ones. Op amps and comparators are sensitive to their Vcc. You can get 20,000 count true RMS DVMs for about £20-£30.

It depends on programming. Some are crude, some are not so crude. The key difference is you get an acceleration bump at the beginning if it's speed based, you don't if it's current base. After a couple of seconds, the difference more or less disappears. I made two videos to illustrate the...

I think all DVMs have built in voltage reference. Multitesters are limited usually by the number of digits of their LCD. There are plenty of cheap DVMs with 10,000 counts which can measure 41.xxV within +/-0.01V.

The Tongsheng 'Turbo' version is well priced to sell against the BBS01 And BBS02. I really can't see where the DM01 would sell into.