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Has anyone got any further with finding the optimum settings for Yose power motors on KT/LCD3 controllers? Or is this a moving target as Yose Power use lots of different AKMxxx motors that have different settings? I've put a 17A KT controller and LCD3 on a front wheel drive Yose 250W motor. It...

An ideal diode uses an active component to drive MOSFETs, then the voltage drop is only tens of mV, not hundreds of mV: https://en.wikipedia.org/wiki/Active_rectification

??? Sorry, I seem to be confusing you and that has irritated you. I should have made it clearer, when I said I spent a winter in the frozen north with the e-bike, I didn't mean in the UK. I completely agree, extreme cold does not stop you using e-bikes, as I was reminiscing, you just have to...

Depends on the location in the UK, plus the weather's enormous variability. Generally not that cold, but not always mild enough that you can ignore it. Plenty of people die of the cold in the UK in winter despite its "mild" climate. I spent a winter with the e-bike in the frozen north. Having...

I haven't got a lot of time to comment on this now, but I'm not convinced by your arguments and I'm worried that people might read what you have written and blindly assume cold weather charging is fine for e-bike systems. An internet search on charging lithium batteries below freezing will tell...

The question is whether you are talking about charging or discharging. Discharging, no problem to quite a way below zero (but you will lose capacity). Charging is a different issue. Charging below zero you risk doing damage. I posted some papers on this in a thread last winter. It's not really...

Operating a Li-ion pack below 0 C is ok, but expect a significant drop in capacity. However, charging should be done above 0 C or you may have issues. So use enough heating to keep the outside shed above freezing, but it doesn't have to be much above freezing.

I think it might be interesting for an experimental pack, but not your main every day pack that needs to be relied upon to work and be safe.

Do you mean 42.1 and 42.2? I'm sure your pack is fine. If you are really worried you could get a smart BMS with bluetooth or whatever and see what the banks are doing in real time. Having an external swappable BMS is only going to introduce more potential problems IMO.

Looks like they forgot to assemble it :D

Glad people have found this thread useful. If your charger/battery combo works now, that's good. But, if it is running at 41.8 V or less, it will not balance the pack in most cases. If it is giving out 42.5 V...maybe that's ok - there could be diode in the charge circuit, so the charger needs...

That's pretty good for a cheap DVM. Even my best cheap DVMs are 0.1 V out on the 200 V range.

Could you put 4x 10 V references in series, powered by separate battery supplies? Would that just amplify the error, or could you measure each reference in the chain and also the overall voltage and compare?

I'm confused, so if your DVM can only resolve to 0.1 V on the 200 V range, were the measurements you quoted above on the 20 V range after all?

That's reassuring to know your meter is reasonably accurate.

Is the meter on the 20 V or 200 V range?

I think 100Wh corresponds to just over 2.6 Ah for 36 V packs. 8.4 Ah sounds a bit large!

I had to resort to taking mine to a friend's house with 60s wiring and no RCD :) Then it would tend to blow the 20 A fuse in the 13 A plug after about 10 to 20 welds. I had a pile of these fuses at one point, but have burned through them all now.

I've had very similar experiences. Bought one of those handheld welders and it makes a good flash and leaves a melted spot on the top of the metal, but the two pieces just fall apart again. I bought it after seeing someone online welding stuff with apparent ease. The Sunkko welder was ok, apart...

Why do you need to buy a lab type PSU for charging? A decent battery charger is fine once you are happy that its output voltage is correct. There is a small risk of drift over time, but if it's well made it shouldn't really be an issue. I've got chargers I bought several years ago and they still...