I haven’t used any of them specifically, I used a different one from Cincon - ECLB40W-110S12 specifically. 40W maximum, and good performance all around. I did need to add some filtering due to the throttle wire picking up enough noise to cause unintended acceleration (yikes), but it’s been solid with very little heat output.
I just went through the Mouser parametric search engine and picked the four cheapest that matched the stated requirements.
Ahh…okay. I had a lot of hits for my searches but was hoping to get some recommendations from ones being used. I’ll take a peek at the Cincon. Thanks!
I don’t think it will be suitable for your application due to the 43v minimum input voltage, that’s why I didn’t suggest it initally.
Ahh…a high voltage converter. Yea, you’re right, not a good fit for a 12S setup but worth keeping the link for in case I go higher voltage.
Works a treat for a 20S ebike!
Though I’m thinking of upgrading to one of these for more power.
Beware that I filtered assuming 10s voltage earlier (I saw 42v mentioned and jumped to conclusions). You may want to try the search again with an updated voltage range (36-50.4 rather than 30-42.) because the ones I picked may not handle a full battery at 12s
Yea, thanks, was just gathering rough ideas of who makes what and trying to narrow down choices to what’s been used. I’ll start from scratch for the searches. 
Wow, that Bel Fuse is a beast. 50mA standby current draw though? 
Guess it doesn’t matter since the pack is disconnected when not in use.
Your lights are drawing all that current?
Nah, the light itself only draws about 20W ish. I also have a QC3.0 dual USB socket, as well as a standard 12v cigarette lighter style socket for powering/charging other things though, so having lots of extra watts on tap for that kind of stuff is a good idea.
I’ve got a switch to turn on/off the 12v system, separate from the controls for the main battery.
Speaking of beasts, you want to see the most BEASTLY of any converter I’ve found?
https://www.digikey.com/en/products/detail/vicor-corporation/BCM6123T60E15A3T01/7389600
Feast your eyes on this crazy thing.
Not only is is more power dense than most car engines, but it’s bidirectional.
…And for the low low price of $400!
LOL…130A!
That would power a few accessories. 
Just a few.
It’s ratiometric not regulated, so the output voltage does change across the input range, but the fact that you can backdrive it means you suddenly have a very convenient onboard fast charger, provided you have a suitable low voltage supply to feed it.
I didn’t see any mention of it’s bidirectional capabilities in the datasheet. Vicor has incredible stuff and must have an awesome bidirectional converter but is it the one you linked to?
It’s bidirectional. Not mentioned in the datasheet, but Vicor’s page on BCMs states
“Bus Converters are high-density, high-efficiency, fixed ratio (non-regulating) isolated DC-DC converter modules. BCMs are available in ChiP or a Vicor Integrated Adapter (VIA) package which simplifies cooling as well as providing integrated PMBus control, EMI filtering, and transient protection. The family extends from 800V to 48V inputs with various K factors to suit a wide range of applications and markets. Based on our proprietary Sine-Amplitude Converter topology, high voltage BCM ChiPs are able to reach peak efficiencies of 98% and achieve power densities up to 2,400W/in³. These flexible modules can be easily paralleled into high power arrays and outputs can be put in series to achieve a higher VOUT. BCMs are inherently bidirectional and also allow designers to reduce the amount of bulk capacitance needed at the load by effectively ‘reflecting’ the capacitance across the module based on the specified K factor.”
And yes, I checked that this specific converter is listed under that statement. It is. 
Thanks. Stunning omission on the part of the datasheet IMO, not showing a block diagram of that functionality along with the other examples.
Not sure how good these are as I haven’t tried one yet, but I intend to soon. About 3 weeks delivery time to USA. Bonus, they do up to 20S
Build quality looks pretty decent, but I haven’t plugged it in yet. I would 100% recommend epoxying the coil down so it doesn’t vibrate itself off the PCB. Probably the capacitors as well.
I use the shit out of these. Good for a few amps.
Cheap. And perfect.
Still use these same bucks or did you switch to something else for any reason?
I have a couple still in use, no complaints
I think I understand that this buck runs more efficiently and therefore runs cooler, but does any of what is mentioned in the second screenshot helpful when it comes to vampire drain on my pack? I’m retro-fitting and already have a double pole switch for my lights and don’t want to have to add another switch to my enclosure.
