Recent content by theloadedquestion

Thanks for all the great replies. Hobby LiPO can be great stuff, but it's not worth losing your house or even lives over, which is a real risk if you don't treat them with the respect and care they require. I did not. Batteries have come a LONG way in recent years and the power density is...

Morning all (or whatever it is where you are), I had a good scare last night that provided a stark reminder of why we treat LiPO (and all batteries really, but particularly LiPO) with the respect and care we do. Most who read here regularly are generally well aware of the dangers and how to...

Cycle analyst is definitely on my wish list but I don't think Santa is going to hook me up so that's out of the budget range at the moment. Thanks for the thorough response though man.

Hey guys, So I recently changed my system from 52v to 72v and I'm having a heck of a time replacing my old wattmeter, a basic bitch, blue 150a turnigy that worked awesome, but sadly is only good up to 60v. Searching for a replacement I was only able to find units with rather large external...

So after further testing and another ride I believe one of my 5s packs has been damaged, possibly a damaged cell, possibly multiple cells. One pair of 5s that are paralleled, with one 5s draining fast and appearing to take more of the load, and one 5s draining slow and appearing to take minimal...

Thanks for the responses man, helped me process my thinking and head back to the simulator. I think I'm definitely going to give 72v a shot. I run LiPO with no permanent wiring harness so it's all easily configurable for different voltages and capacities. Cheers!

This is basically what I'm trying to accomplish. I currently run 52v @ 80a for 4200w peaks, but I'm also ruining ferrofluid and hubsinks, and my cheap Chinese controller (yuyangking) has an 80a batt limit which I'm bumping up against. Even though efficiency drops off sharply over 4000w and most...

Hi, So I've been running my leafbike 1500w at 52v and 80a batt for peaks of 4200w, but I'm wondering if going to 72v would be better? If I run higher voltage I also need to run lower amps to keep the wattage within reasonable bounds correct? This being the case I'm then wondering if that would...

I wish I had paid closer attention, but yes I believe so. I believe it was the 5s pack testing at @ 3.2v/cell parallel with the 5s pack that tested at 4.1v/cell. If so, that would indeed suggest to me that I had an improperly seated connection or something similar. Thanks.

No parralelling between any 4s and 5s, only same voltage, same capacity paralleled. It's just a series connection, 2 x 5s for 36v, plus 1 x 4s for 52v. All cells are same voltage when connected in series and that's all that should matter for series connections.

I don't know why that autocorrected to a from s. I have 6 5000mAh Turnigy 20c LiPO packs, 4 x 5s and 2 x 4s, each pair of 5s is paralleled as well as the pair of 4s first, for 1 x 4s 10Ah and 2 x 5s 10Ah, which are then wired in series for 52v 10Ah. All uses 10ga wire and xt90 plugs. Balance...

Nope, all packs bought as part of the same purchase, same brand, capacity, etc. They probably have eqivalent of about 5 full cycles on them over the course of maybe 15-20 partial cycles. Never been discharged below 3.5v/cell (until that one 5s pack today), and no apparent damage or puffing. I...

Hey all, So I just got back from a ride where my LVC kicked in only about halfway through my trip and I had to pedal all the way home. This seemed weird, but I was also doing some controller tuning and therefore lots of stop, WOT, stop, readjust, WOT, etc before even getting to the trail. And...

Hey fellow leafheads, While I've done my own on road testing to tune my controller batt and phase amps for best performance without unreasonable temperature climbs (running FF with hubsinks), I've recently been playing around with the ebikes.ca sim and have a question. The highest I can get...

Okay thanks, I may end up having to go this route. Though I also may just end up waiting until I replace controller eventually and get a CA3 and replace the stock thermistor. Would be nice if it wasn't so involved but oh well.