Search found 1556 matches

by rg12
May 22 2022 5:06pm
Forum: Battery Technology
Topic: Paralleling packs with a protection diode?
Replies: 9
Views: 250

Re: Paralleling packs with a protection diode?

larsb wrote:
May 21 2022 8:35am
Sure, put a diode with a low voltage drop on the discharge line as protection against inrush/charging by the other pack. Connect additional separate wires to each pack without diode for the charging.
Ahh awesome! didn't know it's that simple, thanks!
by rg12
May 21 2022 6:30am
Forum: EBike Technical
Topic: Upgrade Flipsky 75100?
Replies: 4
Views: 604

Re: Upgrade Flipsky 75100?

You would have to recompile the firmware below with increased current limits How to update firmware on the Flipsky 75100 FOC ESC https://forum.esk8.news/t/how-to-update-firmware-on-the-flipsky-75100-foc-esc/61819 Ahh thanks alot! Any recommendation for the best mosfets out there that fit the 75100?...
by rg12
May 21 2022 6:28am
Forum: Battery Technology
Topic: Paralleling packs with a protection diode?
Replies: 9
Views: 250

Paralleling packs with a protection diode?

Is there a simple way for protecting the parallel procedure of two identical packs that are paralleled while at different SOC voltage? I know that some lead acid guys do something with diodes for that and didn't really understand how a diode would help. I want to prevent or slow down the charging of...
by rg12
Apr 09 2022 12:39pm
Forum: Battery Technology
Topic: Looking for a 140A BMS within certain measurements
Replies: 4
Views: 257

Re: Looking for a 140A BMS within certain measurements

Their website is a bit strange- try a different browser? Specs at https://www.speedict.com/tech-specs For the 20s- Max. Discharge Current 250 A (Rated) 280 A (Peak) There’s a thread here by the owner of speedict https://endless-sphere.com/forums/viewtopic.php?f=14&t=73354&hilit=Speedict&...
by rg12
Apr 07 2022 5:11pm
Forum: Battery Technology
Topic: Looking for a 140A BMS within certain measurements
Replies: 4
Views: 257

Re: Looking for a 140A BMS within certain measurements

electric_nz wrote:
Apr 05 2022 5:34pm
Speedict Neptune 14 or 20?
Wow, looked all over google and also their official website and zero information about bms specs, nada, just blubbering about ground breaking ideas (which are just common features of any bms) and price their tiny (can't be high current) 20S at 188usd
by rg12
Apr 05 2022 3:54pm
Forum: Battery Technology
Topic: Looking for a 140A BMS within certain measurements
Replies: 4
Views: 257

Looking for a 140A BMS within certain measurements

Am looking for a BMS that can output 140A (peaks, for an ebike) that doesn't exceed 130x135mm (thickness doesn't matter).
Have looked all over :(
by rg12
Apr 02 2022 6:41am
Forum: EBike General Discussion
Topic: Thermal compound W/mk rating BS
Replies: 14
Views: 701

Re: Thermal compound W/mk rating BS

What do you guys think of this one? https://www.digikey.co.il/en/products/detail/techspray/1978-1/7914539 Thats the datasheet: https://www.techspray.com/content/msds/TS-1978_ENG_TDS.pdf It's non silicone and industrial looking which seems better to me than fake ratings of over colorful tubes with st...
by rg12
Apr 02 2022 6:00am
Forum: EBike General Discussion
Topic: Thermal compound W/mk rating BS
Replies: 14
Views: 701

Re: Thermal compound W/mk rating BS

Been mentioned once already, but here is a link: https://www.youtube.com/watch?v=Glfak2B9J5U Might also be good to look at the other side of the problem too. Why are you pumping so much waste heat into the air? Possibly better components, mosfets, etc would be more efficient and could get by with n...
by rg12
Mar 31 2022 6:27pm
Forum: EBike General Discussion
Topic: Thermal compound W/mk rating BS
Replies: 14
Views: 701

Re: Thermal compound W/mk rating BS

Beware many of the ultra high thermal conductivity pastes these days are liquid metal alloys that may not be suitable for what you're doing. The "tech ingredients" youtube guy makes and sells some surprisingly good paste now. Im using it for mounting an alloy heatsink to an alloy plate. W...
by rg12
Mar 31 2022 1:47pm
Forum: E-Vehicles General Discussion
Topic: Lost my 20S Anti-Spark eBay link
Replies: 2
Views: 407

Re: Lost my 20S Anti-Spark eBay link

https://www.ebay.com/itm/324809748273 I've used these plugs at 20S, pretty beefy. or are you looking for actual switches? https://flipsky.net/collections/anti-spark-switch/products/flipsky-anti-spark-switch-aluminum-pcb-300a-for-electric-skateboard-ebike-scooter-robots Wow that is soooo stupid of f...
by rg12
Mar 31 2022 3:15am
Forum: EBike General Discussion
Topic: Thermal compound W/mk rating BS
Replies: 14
Views: 701

Re: Thermal compound W/mk rating BS

Beware many of the ultra high thermal conductivity pastes these days are liquid metal alloys that may not be suitable for what you're doing. The "tech ingredients" youtube guy makes and sells some surprisingly good paste now. Im using it for mounting an alloy heatsink to an alloy plate. W...
by rg12
Mar 31 2022 3:12am
Forum: E-Vehicles General Discussion
Topic: Lost my 20S Anti-Spark eBay link
Replies: 2
Views: 407

Lost my 20S Anti-Spark eBay link

Hey guys,
I've had this link for a listing on ebay that was selling 20S antispark switches...
They had many types for high current and high voltage switches.

Any idea how to find it?
by rg12
Mar 28 2022 2:34pm
Forum: Battery Technology
Topic: Orion BMS contactor max trigger current?
Replies: 0
Views: 196

Orion BMS contactor max trigger current?

I have an Orion BMS, went through it's manual a few times and they mention nothing about max driving current for the contactors.
Does anyone have any idea?
My contactor requires 500mA
I have sent them an email and they don't reply :(
by rg12
Mar 28 2022 1:19pm
Forum: EBike General Discussion
Topic: Thermal compound W/mk rating BS
Replies: 14
Views: 701

Re: Thermal compound W/mk rating BS

Good thinking, thanks alot! Just went through mouser and digikey... One brand that is showing in both called Chipquik has a rating of 79W which I call total BS, then they have a syringe with 8.5W, then another can with 4.3W (which they claim is ultra conductive)... Another brand that looks legit (ju...
by rg12
Mar 27 2022 6:02pm
Forum: EBike General Discussion
Topic: Thermal compound W/mk rating BS
Replies: 14
Views: 701

Thermal compound W/mk rating BS

Am looking for a good thermal paste with high conductivity for my heatsinks in order to replace my chinese one that is rated as 1.8W/Mk. I went through amazon and found loads of brands and I sense a total bs market selling 1g at like $10 while each brand declares a higher and higher conductivity ran...
by rg12
Mar 27 2022 5:57pm
Forum: Motor Technology
Topic: Phase current limits speed?
Replies: 6
Views: 272

Re: Phase current limits speed?

So as I thought, it ain't just a voltage number going in the motor but pulses (PWM) which makes much more sense than having a low voltage with low RPM when the current at the phases is higher than the current coming out of the battery. What makes a motor turn (provides torque) is current. When a mo...
by rg12
Mar 27 2022 2:06pm
Forum: Motor Technology
Topic: Phase current limits speed?
Replies: 6
Views: 272

Re: Phase current limits speed?

This type of schematic can help: 06FF9310-D626-453A-8ACA-ADFDF925C697.jpeg Also the fact that peak phase current on a sinusoidal wave is 1.4x the battery current So as I thought, it ain't just a voltage number going in the motor but pulses (PWM) which makes much more sense than having a low voltage...
by rg12
Mar 26 2022 11:53am
Forum: Motor Technology
Topic: Phase current limits speed?
Replies: 6
Views: 272

Phase current limits speed?

Two scenarios: 1. 60V 70A battery current 70A phase current 2. 60V 70A battery current 100A phase current Assuming that I'm cruising at top speed meaning 60V*70A=4200W Now my problem is with example #2 where the phase current is higher than the battery current. The total power going from the control...
by rg12
Mar 18 2022 11:15am
Forum: Battery Technology
Topic: High voltage bms anyone?
Replies: 6
Views: 315

Re: High voltage bms anyone?

I just checked them out and they seem like some ancient tech compared to today's stuff. I don't see any software or clear examples of how it works, features etc... This is their homepage. http://www.liionbms.com/php/index.php If that doesnt' have whatever info you're after, you might try contacting...
by rg12
Mar 14 2022 5:51pm
Forum: Battery Technology
Topic: High voltage bms anyone?
Replies: 6
Views: 315

Re: High voltage bms anyone?

There is one for sale here in the for sale section. I bet t could get shipped to you. its like a 1200$ Distributed BMS.. a Elithion. Asking is 250$. It is a nice mature system. Well known for use in that range. Or you can contact Elithion. https://endless-sphere.com/forums/viewtopic.php?f=9&t=1...
by rg12
Mar 14 2022 3:17pm
Forum: Battery Technology
Topic: High voltage bms anyone?
Replies: 6
Views: 315

High voltage bms anyone?

I worked with Orion before and am trying to get their 180S version for an urgent project but the shortest lead time I received is 10-12 weeks! So the urgency lead me to start looking again and found one that was too tall (can't be taller than 80mm) and they have a lead time of 26-30 weeks(!) due to ...
by rg12
Mar 14 2022 3:11pm
Forum: Battery Technology
Topic: Max charge current to have balance on?
Replies: 52
Views: 1610

Re: Max charge current to have balance on?

Aha, chinglish strikes again. Nitpick, best not to use "speed" for amps, current rate. As to the original question, just rely on "start balance voltage" that particular setting does not really make sense unless you had explicit control over the charge rate, so a "normal cyc...
by rg12
Mar 14 2022 9:19am
Forum: Battery Technology
Topic: Max charge current to have balance on?
Replies: 52
Views: 1610

Re: Max charge current to have balance on?

My point is that just because the user interface lets you input 50A does not magically mean that the balancing (resistance-burning type) current rate can go that high. I would be very surprised if the actual rate can be higher than one amp. That setting doesn't mean balance speed, it means max char...
by rg12
Mar 12 2022 4:46am
Forum: Battery Technology
Topic: Max charge current to have balance on?
Replies: 52
Views: 1610

Re: Max charge current to have balance on?

My question is, why is it bad to have balance on when charging at say 20A? Why wouldn't it balance at any charge speed? Here's the Reality ... If you've got even just one weak/poor cell in just one of your parallel groups even using a 5A active equalizer balancer board before bulk charging ... Lots...
by rg12
Mar 09 2022 1:54am
Forum: Battery Technology
Topic: Max charge current to have balance on?
Replies: 52
Views: 1610

Re: Max charge current to have balance on?

I know people who bought an android especially for the ant bms :lol: Yes, im one of them. First I bought a $70 android and it wouldn’t install any of the newer apps with the 6 password slots. Then i went back and traded it $200 android phones just to use a $70 BMS. If your phone scrolls the state p...