Endless Sphere

But any progress / update on the Fliermodel 500a ESC ? Not yet. It will be another month or so. It failed from a control glitch causing shoot through IMHO. It would be nice to know for sure. Was heating and high voltage a factor? It seemed to be at steay state and then it just popped. Here is a gre...

ecotech wrote:How much did it cost you?

$408 on aliexpress.

Actually, the diagrams are not exactly correct, but the pics are. It helps to remember that electricity "flows" backwards, neg. to pos. Therefore, the #1 balance lead is the first neg. associated w/ the the first cell that receives the neg. main lead and everything follows from that. Ok, ...

I received my 10 packs 4S 16Ah multistar batteries about a week ago and have been anxious to put them to a storage charge level. They all came in at about 15.0V with each cell at 3.75V. Almost every pack had each cell withing 2mV! Out of 10 packs, none were duds. Pretty happy about that. Also, I inc...

Thinking of ways to charge and balance four 4S packs at once. I just purchased the 308Duo charger http://www.icharger.co.nz/manuals/308DUO.pdf and it can charge and balance two 8S packs. So I just need some adapter cables like shown below. Does anyone see a problem with doing this? https://farm6.sta...

.....BUT.. The big disadvantage is a perception of fire risk !.. And low cycle life ! ( both arguable on sketchy info)....The choice really depends on the application........Now sit back and let the debate resume ! Much of the low cycle life posts I read were because they used the battery below 3.5...

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This post may be of interest here: RC LiPo vs 18650 Cell High Power Packs viewtopic.php?f=14&t=84949

I don't want to derail this thread so please post comments there

' I know there is a ton of info deep in these threads about the pros and cons of building packs, and I want to specifically compare building a pack from an array of R/C LiPo packs and an array of 18650 cells. As we gather info and test results, I will update this post to summarize these pros and con...

I've made a few purchases from the UK, Canada Ect. They all say the same thing, you may be charged tax by your Customs and I have never been charged tax by our customs. I am also on the West Coast USA. I just bought 10 units so we'll see. I plan on testing each one individually to see if there are ...

Finally got around to ordering the tungsten electrodes that Sunstone recommended for copper, http://sunstonewelders.com/product/resistance-tungsten/?attribute_tungsten=EL125TUNG I'll let you know how it works out. Tom Interesting shape for the electrode. Can you confirm with them the optimum shape ...

You will find grinding Thoriated Tungsten is very toxic. If purchasing Tig tungsten eletordes to make your own, Green is pure Tungsten where other colours have other elements. It might be a good idea to find out what tungsten electrode colour / type Sunstone use for copper. Good call on the toxicit...

If you plate with nickel, it may make spot welding easier due the increased resistance. 2 for 1 hopefully (corrosion resistance + weldability). just how much would that resistance increase ?? i doubt the difference in resistance through a few microns of nickel at the interface , would be significan...

I know you are using data from reference tables, but i am struggling to understand why a microscopic plating thickness of Nickle on the surface of a copper conductor would cause its Ampacity to be reduced by 13%...?? For sure , its Conductivity would not be affected. Can anyone explain ? Good point...

Plating is cool but why wouldnt you simply spray the finished assembled pack with one of the protective coatings used for electrical equipment and motors etc,..like Scotch 1601/1602. ?http://solutions.3m.co.uk/wps/portal/3M/en_GB/ElectricalMkts/ElectricalSupplies/products/sprays-coatings/insulating...

.....I would then be using about 10 meters total of conductor strips... Interesting. Take a hypothetical pack of 14Sx16P. Below I created a circuit diagram of the sub-group of the sketch I made previously. The current from these four cell Ctot is then dumped into a cable. Even in this simi-ideal si...

Here is my thread for the Fliermodel 22S 500A 25kW ESC

viewtopic.php?f=30&t=84783

' Since we have limited test data on these "high powered" ESC, I want compare everything we can with the Alien 24S 420A ESC and why it failed at 80V and 100A. There is so much to consider: 1) Test voltage and current 2) Fet type and quantity 3) Capacitor type and quantity 4) Cooling fans, ...

' I bought this new ESC from Fliermodel http://www.fliermodel.com/en/prc-show.asp?id=694 Mass = 1.52kg (as shown in photos below) L x W x H: 7.8" x 4.3" x 2.0" Many of you will likely want to reply that this thing is crap and will not withstand much power. And that might be so. Howeve...

So are you in Europe(profile please)? If not, why are you wasting your time w/ that sketchy site over there. It seems to me that many of the reviews are from a core of haters that have some sort of vendetta against HK. I'm in California (profile updated :wink: ). Is European HK site different? I on...

I would like an update on how these batteries are holding up after 50+ cycles. Anyone? The link below shows a teardown of a smaller Multistar battery. You can see the cells are flat and rectangular similar to cell phone batteries. Any thoughts on how these cells compare to 18650 in terms of durabili...

I 'peeked' inside my Luna Cycle Shark battery pack. It was suggested that I link the pictures to this thread so ... https://endless-sphere.com/forums/download/file.php?id=205144 The full thread is here https://endless-sphere.com/forums/viewtopic.php?f=3&t=83817&p=1239761&e=1239761 Are t...

' I'm considering ordering 18 of those packs and configure them in 6Sx3P (packs) for 89V and 48Ah. This would get about 15min at 150A for $1,000 including shipping. Each pack will be drawing 50A which seems more reasonable. I may need to remove 2 cell off 3 packs to make is a 22S due to the limitati...

Quick and dirty test pack solution .. https://hobbyking.com/en_us/multistar-high-capacity-4s-16000mah-multi-rotor-lipo-pack.html 6 of those will give you 24s, 16 Ahr with 160/300 amp potential for $300 ! Double up the quantity for more run time and less voltage sag ..still only $600 Quick and easy ...

And at 10a/cell that GA pack will be giving closer to 70v than 90v and dramatically lower at 288a peak pack current. Have you considered renting a large genset ?? The ESC I'm testing is the newer Fliermodel 22S 500A airplane version. It is not clear to me what is limiting the voltage? For fully cha...

After some review, I'm coming to the conclusion that I need a bank of batteries. Trying to modify my shop electrical system to handle 30kW of power is silly. Especially for 10-30min tests. So to go the battery route, is there batteries on the market that will be cheaper to use for short term testing...