Recent content by timmy66

This is an example kit from amazon, $103 presently https://www.amazon.com/gp/product/B07H5FFJ53/ref=ox_sc_act_title_1

Micah posted this video recently (below) on the $182 conversion - I'm trying to find some more discussion on this type of motor kit, eg. max speeds (reduction in the gear transmission), reliability, etc. etc. Sorry if there's a thread elsewhere, tried to look a bit...

I'm trying to make a battery to replace a Greenworks 40V battery. I've searched a lot. There are 4 connections from the battery : + , - , C , and Ohm (Omega). +,- are as thought. C appears to ground to - when the tool is operating. Ohm reads ~2.6V when tool is operating. The resistance on it...

Anyone figured out how to simulate what the 3/4th terminal of the battery is doing? eg, if wanting to make my own greenworks battery for one of their adapters? What was the diode doing mentioned above?

I'm having trouble following the curve, the one attached has default-ish values populated after simulation. As you move toward faster speeds, eg. past 32.7kph as the vertical line indicates, the power (red) begins to decrease. Why is that? It would seem to imply that going faster past this...

I'm sorry to ask a dumb question, have read through many of the pages: but is the highest power opensource compatible controller either this (psw : SKU:KT36/48SVPR-20A ) http://www.pswpower.com/ven.php?cargo.2016-3f-33c0 or (bms battery : s12s 500w)...

Am having a hard time finding a source for these -- have seen the leafbike option (link below), but shipping is almost half purchase price. All the others are laced to a fat tire rim. Is there an ebay / amazon seller in the US? Are there significant quality differences between what's out...

Searched quickly, a programmable charger doing up to 58.8V / 28 A , controllable via PMbus , CC / CA. pdf spec sheet https://www.meanwellaustralia.com.au/file/11733/download?token=u4GTTiS- product page: https://www.meanwellaustralia.com.au/products/rpb-1600 ~$300 in the USA. About 3x...

Someone has figured out the communication protocol, no need to buy Mean Wells programmer interface. https://github.com/Zweikeks/meanwell-enc-series-chargelog from http://www.irv2.com/forums/f54/program-and-monitor-mean-well-enc-series-of-battery-chargers-e-g-enc-120-12-a-342716.html Very...

Am curious for these types of packs -- how well are they maintaining their balance when used this way? What is the estimated lifetime of these types of packs - same as modern 18650 cells? Nice seeing a reasonable option, thanks for sharing.

This is a very interesting project, I can see you've done a lot of work here. Are you concerned that you won't have a platform for using it if BMSBattery stops selling this? Or if you've gotten the schematic well documented, maybe invite someone else to produce the hardware so there's no...

Curious if there's a source for these with less expensive shipping ($35 to USA). Shipping is same price as controller!! I'm interested in buying one to experiment with casainho's open source firmware. Any followups (bad) news from those that have been using this for a few years now? Thanks.

Could you make a quick recommendation for helping with the project : I have a 48V standard "9c" type wheel - what controller would you suggest that would work with your firmware/development, that's around 1000 W or less. Several of the controllers seem to be in the low watt range, I'm more...

I've read thru this and other threads talking about stacking several 12V power supplies in series, and then adding a lab type power supply that's current limited. I'm not sure I understand this really well -- the lab supply functions as the constant current part that will do the transition to...

Curious for others that have built their own packs, if you'd opted for 15s, 16s, or higher ?? for DIY'ing your own packs with LiFePO4 cells. It seems their discharge curves flatten more around 3.2V than their charging 3.6'ish V rating -- making you want to add another series group or three, to...