ES 1.0 Graveyard

Anyone use or have thoughts on these pre-made copper nickel strips? https://www.amazon.com/gp/product/B0B789WW5D/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1 They claim 20A rating. I took a leap and ordered them and will let you all know what I see, however my testing methods are crude and ...

Why would the little capacitance of the plug matter?

Do u use the 4 little pins with that connector?

Average contact resistance of nickel resistance spot welded to a Panasonic 18650 with 12 spots is about 167 milliohm Clamping Copper, polished with 800 grip paper, clamped with 400N of force, can achieve 50 milliohm. Is it just me, or is 167milliOhms ..extremely high for a fused metal connection ? ...

Someone did the math in another thread and the inrush current is huge and the antispark resistor gets destroyed often. Other than the AS150 connectors that have a bigger resistor there seems no simple antispark plugs available for higher voltage systems. I have some qs8 that were made with a bigger ...

Heating water takes a lot of energy. Running LEDs seem a more reasonable expectation. That’s done and being sold
Thanks for your help and lost interest in making something

https://www.sfu.ca/~mbahrami/pdf/2011/Investigating%20electrical%20contact%20resistance%20losses%20in%20lithium-ion%20battery%20assemblies%20for%20hybrid%20and%20electric%20vehicles.pdf This study shows a good connection with 2000 ft/lbs pressure on 364mm^2. To get similar pressure on a 18650 with o...

Nice find thanks!
How much pressure will a commonly used n52 with .2mm copper between put on a cell though?

https://www.kjmagnetics.com/calculator.asp

I’m math illiterate but seems the pressure from a magnet on a cell is far far from what this study is talking about, no?

--the magnets are least likely to damage cells during the build process, but will probably have the highest interconnect resistance, and so the lowest current delivery capability and highest voltage sag. Have you seen evidence of the magnet method having higher resistance? I thought it would have t...

transposon wrote: ↑

Jan 08 2023 11:04pm

Are people adding a pull down resistor between ADC1 (throttle) and ground?

Please tell specifically how you do this. What resistor and what ADC1 pin? I don’t find anything about a “pull down resistor” on the site.

You have to look at the energy, not power. :thumb: Water going from 60psi to zero psi can only do so much work, and it isn't much. isn’t it possible to know exactly how much energy is there? While you could use some kind of turbine to generate electricity and convert that to heat, you could get the...

You can let water sit in a jug on the side or lay a garden hose in the sun or use heat tape but nothing new in that. What of the potential of the 60psi water pressure at the tap? That’s a lot of pressure and surely could spin out some decent wattage. I think for sure more than 110watts. I want a war...

"As a general rule of thumb, it requires 2.47 watts of power to raise the temperature of one gallon of water one degree in one hour." Ok. If assuming 110 watts available (or say 100 watts to make it even simpler), and adjusting so there was only a flow of one gallon an hour..(wouldn’t the ...

Why wouldn’t nichrome wire submerged in water be completely efficient at converting from electricity to heat? I thought would be energy efficient but maybe not financially efficient Looking on wiki it’s confusing and says using resistance heating is about 100% efficient yet heat pumps are said to be...

“it requires 2.47 watts of power to raise the temperature of one gallon of water one degree in one hour." Why is time in the equation? Given all the great numbers you found and math u showed (very appreciated) can you guess as what wattage needed to produce a lukewarm weak flow of maybe 1/8th a...

What you think of using a Tesla turbine, or whatever turbine, running off the faucet water pressure, turning a generator with nichrome wires, that the water also runs through? ( I guess just short the motor wires) This place claims 110watts of electricity (at unknown details): https://www.prnewswire...

The two batteries are the same capacity so yea will only charge to 50% capacity. I’ll try with just two cells put in parallel w no added resistor. I think the stated charge rate is conservative and if charging to a low soc higher charge rates maybe have minimal effect. I’m sure someone has done this...

You absolutely sure you want to risk this? No. I think my charge port is too limiting anyway but wonder for the future how fast could charge and with what degradation. I’m assuming it’s safe enough. Yea maybe too safe and prompts me to abuse my battery. I’ll have to try with just two cells n see ho...

At full it’s 87v 11.4ah. Lifepo4. 24s3p K2 26650 3800mah cells. Continuous Discharge rate: 12A (4c) Pulse 30 Seconds Discharge: 28A (8c) Charge Current: 3.8A (1c) The rated charge current is low but surely can be charged faster and cause little loss up to maybe 80% capacity, no? I planned to get the...

The Battery Doctor wrote: ↑

Jan 07 2023 10:29am

Looks you are using panasonic cells and they can take alot.

U have evidence?



All chemistries seem to put out the same smoke. It seems a huge amount. How dangerous and polluting is it?

This convo scares me. I use lifepo4.

I think it does have less rotation because it has to work both ways.

Why not use a one way bearing instead of a freewheel type ratchet? Theyre wide so assume able to take off-kilter loading and the clutch mechanism seems fail proof.

https://youtu.be/umZYlF-INjk

Probably not as efficient but a minor loss and people don’t seem to care.

The magnet wire insulation is very thin and doesn’t take up much space. I think if you can get the same amount of copper on with big wires or thin it should be the same performance with the only variables being thin wires trap more heat with air pockets, and if those thinner wires are a tangled mess...

With lifepo4 I feel safe just using the light up “discharge balancers”. Cheap and small Theres simple cheap capacity testers u can find. Finding the internal resistance isn’t necessary if u know the capacity but there’s the “three wire method” for finding precise resistance of a cell. Even then it’s...

The inductance difference between a bar and stranded (or litz) is simply irrelevant at these sizes. You mean at those "frequencies" instead of "sizes"? you woke me from my ev sleep telling me the measurements of wattage, amp.. on the vesc weren't accurate; how can you tell what ...

The inductance is only different beyond commutation frequency ranges of laminated iron core stators. im saying when I do a messy job of wrapping the wire around the teeth as opposed to doing it neat and orderly it will show a lower inductance on my L/C meter and the motor ends up with a higher kv d...