Recent content by Ebikes4Real

You don't need to make a new controller PCB, and I can assure you, nobody else has made any custom PCB for the BBSHD controller. Dream on if you think a new controller case is going to make heaps of difference to the reliability of the controller. Just fit upgraded mosfets and add an extra...

I don't see why it would offer any huge advantage to have a new case for the controller. Of course, it can help a bit, but you're bolting it onto the side of a motor, that is operating well above it's rated power and that motor will get hot if used hard. 12 good mosfets can reliably make 40A or...

The OP did state the 1st cell group was at 2.8V resting voltage and the rest were higher, when he checked the pack voltage, some time after the pack tripped. This clearly shows that the BMS tripped for a valid reason and it also indicates, that the 1st cell group (at least) is fully discharged...

I think you missed where some points were clarified, the OP isn't saying that :) To be fair, the OP did state the kit is setup with a 38V, but that is slightly immaterial, as the battery BMS is tripping. If the BMS is tripping, then it can be assumed that the battery is unable to deliver any...

It needs more than just a few pics to explain how to do the procedure, but here some of pictures I took. It is quite difficult to remove the PCB with heat spreader from the case. After removing the 2 bolts, you need to pick out the sealant, especially where it touches the case. Once much of the...

To Greenmachine/Eric (and Rodney). This is a forum and people are free to discuss things. I didn't realize it was now a requirement to give your name and personal details, if you say something that hurts someone's feelings or self interest. The OP came on with a problem and like lots of others...

Well TBH I hadn't run the figures until you questioned it. Was pretty much sure I was right with my assumption, and was rather relieved the figures backed it up :) Anyways, it's alive and is spinning up the motor. Will get it installed on a bike very soon and see how it performs. Will get...

The absolute minimum voltage that a typical 14s battery will trip at is 38.5V (14*2.75V), but typically, there will be some small imbalance that means it trips before that (no BMS will have an LVC as low as 2.5V). 39-40V would be more typical voltage at which a well balanced pack would trip at...

At 30A with a 2.5mohm shunt, you will have 75mV drop across the shunt. 75mV drop across a 1.666667mohm shunt = 75/1.66666 = 45A Add 2 additional shunts for a 1.25mohn shunt and now the 75mV drop would be equivalent to 60A. In that case, you need to program to 50% of the required current level...

You can't dissolve the potting, so far as I know, it needs to be picked out. It takes some time, but isn't so bad, once you have some idea where everything is, where the cables go and you have a bit of a technique for it. Of course it would be much easier if you started with an unpotted...

I've started to modify my BBSHD for more current. I've picked out the sealant, to get back to the PCB and I've found a few things: 1. The standard BBSHD controller is fitted with pretty low end mosfets from the factory (P75NF...). Not the same IRFB3077 as come fitted in the 750W BBS02. Hmmm...

Please be aware, we are all part of a conspiracy against Luna. It must be true, it seems to be saying as much here: https://electricbike-blog.com/2016/09/22/lunacycle-releases-their-50amp-bbshd-that-ive-been-testing-for-6-months-but-you-gotta-buy-the-whole-bike/comment-page-1/#comment-4466 An...

If you mean the OP, then I don't think he has really done anything particularly wrong here. The only thing that he has done is trust the information he was provided and assumed that the battery would deliver on it's promises. Details currently listed are: •14ah massive for this size • 702-watt...

To the OP. What is the max current of the kit you are running with this battery? Again, to the OP, I suggest you get an RC wattmeter (or better still a Cycle Analyst as this does a lot more and keeps the data when powered off), that provides both Ah and Whrs. Relying on just Whrs, is not...

It's UN38.3 BTW. If you don't mind us asking. Why go to the trouble and expense of doing UN38.3 on all those packs (plus every variant), then only offer ground shipping and not ship batteries internationally? Can you try to answer that, without taking a shot at any other companies/countries :)