Idea for next video based on this one is to do a calculation on how hot the connectors will get under the load conditions you put them, bases on their resistance
I thought about that, but that would get complicated, because heat will play a role. At least with these measurements, there's a baseline. So EC8 connectors have less than half the resistance of EC5 connectors - as temps rise, that relationship probably remains fairly constant. Add a bunch of connectors and some heat and suddenly you're talking about the difference between 20 milliohms and 50 milliohms - that's pretty significant if we want to maintain max voltage to the ESC/motor.
Just ordered the VICI VC480C+ meter for $95. Was looking for a meter that uses the 4-wire Kelvin bridge, which is required to measure connector resistance. Will probably use it once to compare resistance of ways to connect wires (twist, solder, crimp, solder and crimp, and solder sleeve). Too much Science Club as a kid, I guess. I've read crimp connectors are reliable for auto use, but have like 3X resistance and build up heat. Solder makes good electrical connection but is prone to failure if not secured from vibration.
Hello, great informative video thank you. just a question please. My boat is wired up with EC8's. My batteries all have EC5's. I can have them re soldered with EC8's. Ive seen one can buy EC5 to EC8 connectors ( no wire in between ). I was thinking of using these connectors instead of have the batteries changed over to EC8's. Is this a good option with regard to current flow ? Appreciated
IMO they're a bit silly since you can just add a large-ohm resistor to an extension balance harness that you add to the esc's power connectors. When you connect the balance connector, it charges the caps slow enough to not spark when the mains are connected not damage the thin wires.
I don't use them - I use the resistor idea that Hydrocarbon82 mentions. Though I'm not using these for RC stuff - there's tons of room (relatively speaking) in a full-size car.
In a Columbo from the 70s, a guy dressed up as an icecream vendor and killed a guy in a pool by hitting on the head with an ice block. No murder weapon found. But, the ever astute Columbo noticed non-treated water where he was standing.
Great video! Would love to see an update with the newer larger connectors common in high load RC applications. Specifically XT90 (4.5mm), XT90-S (4.5mm anti-spark), XT150 (6mm), Castle Polarize 6.5mm, AS150 (7mm anti-spark), QS8 (8mm anti-spark) & QS10 (10mm anti-spark). Also would be good to perform actual load to failure testing on each to see true maximum continuous and burst capacity. For the anti-spark variants would also be good to see if these anti-spark features actually result in any significant reduction in resistance over cycles/time.
Based on the current those connectors will carry, wouldn’t it make more sense to measure the voltage drop of them under load? When testing vehicle starting Circuits, you use voltage drop tests to find problems.
You can easily calculate the voltage drop. If I simply measured the voltage drop, it wouldn't be a fixed number; it would depend on the voltage used. Also, keep in mind resistance will go up as the connectors heat up. But you can calculate the heat build up too. Here's how: use Ohm's law - V=IR or put another way, volts = current x resistance. So let's say your connector has a resistance of 10 milliohms, or .010 ohms. If your current is 250 amps, the connector will drop 250*.010 or 2.5 volts. The connector will also have to dissipate 625 watts of heat (!) - use this formula: P=VI. Or Watts = Volts x Current; in this example 2.5 X 250. Obviously, one of these small connectors will melt pretty quickly with that much heat. But then again, none of these connectors were that bad.
That's actually exactly what a milliohm meter does, and why it has 4 leads instead of 2. 2 of those leads pass a fixed current through the connector, and then the other 2 are measuring the voltage drop. so if the meter passes 1A through the connector, then the voltage it reads is the resistance of the connection R=I*V or R=1.000*V
I'll look into those. But now I'm using real Anderson Power Poles - the 175 amp ones. They dwarf all these combined. But these RC connectors still have their uses.
Hmm I actually found this because I was on there search for low resistance connectors for mA measurements so I don't have to solder the wires directly.
Good video. Would like to have seen the XT90; however, I'm not using any of them. Also, I'd like to see the difference between EC5's with what I call a wire basket and the segmented pins.
This method is a waste of time and a very inaccurate way to determine how the connectors will perform in their intended application. The correct method which is much more accurate and provides consistent results is to apply a constant high current through the connector being tested and measure the voltage drop across its terminals directly with a mV meter You will need a power supply capable of providing at least 50A, if not higher as todays RC planes, cars, helicopters etc can draw as much as 100A or so. This method will also highlight any connector deficiencies such as long term overheating problems.
" The correct method which is much more accurate and provides consistent results is to apply a constant high current through the connector being tested and measure the voltage drop across its terminals directly with a mV meter" This is pretty much what a milliohm meter does, like the one seen in this video. See how it has 4 leads? Two are used to apply a constant voltage through the connector, while the other two leads messure the voltage drop.
![[#2024MAMA] BIGBANG (빅뱅) - 뱅뱅뱅 (BANG BANG BANG) + FANTASTIC BABY | Mnet 241123 방송](http://i.ytimg.com/vi/EQsYfiPR9uM/mqdefault.jpg)
Idea for next video based on this one is to do a calculation on how hot the connectors will get under the load conditions you put them, bases on their resistance
I thought about that, but that would get complicated, because heat will play a role. At least with these measurements, there's a baseline. So EC8 connectors have less than half the resistance of EC5 connectors - as temps rise, that relationship probably remains fairly constant. Add a bunch of connectors and some heat and suddenly you're talking about the difference between 20 milliohms and 50 milliohms - that's pretty significant if we want to maintain max voltage to the ESC/motor.
Just ordered the VICI VC480C+ meter for $95. Was looking for a meter that uses the 4-wire Kelvin bridge, which is required to measure connector resistance. Will probably use it once to compare resistance of ways to connect wires (twist, solder, crimp, solder and crimp, and solder sleeve). Too much Science Club as a kid, I guess. I've read crimp connectors are reliable for auto use, but have like 3X resistance and build up heat. Solder makes good electrical connection but is prone to failure if not secured from vibration.
For comparaison: Keep in mind that 1 feet of 10 AWG copper conductor is precisely 1.000 miliohms.
Thank you. Good work.
Great information.
Excellent Information
Ice sickle's are a great weapon as long as you are not having to wait very long for your victim! )
lol
Hello, great informative video thank you. just a question please. My boat is wired up with EC8's. My batteries all have EC5's. I can have them re soldered with EC8's. Ive seen one can buy EC5 to EC8 connectors ( no wire in between ). I was thinking of using these connectors instead of have the batteries changed over to EC8's. Is this a good option with regard to current flow ? Appreciated
What do you think of the "anti-spark" features available on an option on some of these connectors?
IMO they're a bit silly since you can just add a large-ohm resistor to an extension balance harness that you add to the esc's power connectors. When you connect the balance connector, it charges the caps slow enough to not spark when the mains are connected not damage the thin wires.
I don't use them - I use the resistor idea that Hydrocarbon82 mentions. Though I'm not using these for RC stuff - there's tons of room (relatively speaking) in a full-size car.
Id discuss the icicles but my fbi guy may freak out a bit.
lol. frozen bullets? I watch too many British procedurals...
In a Columbo from the 70s, a guy dressed up as an icecream vendor and killed a guy in a pool by hitting on the head with an ice block. No murder weapon found. But, the ever astute Columbo noticed non-treated water where he was standing.
Great video! Would love to see an update with the newer larger connectors common in high load RC applications. Specifically XT90 (4.5mm), XT90-S (4.5mm anti-spark), XT150 (6mm), Castle Polarize 6.5mm, AS150 (7mm anti-spark), QS8 (8mm anti-spark) & QS10 (10mm anti-spark). Also would be good to perform actual load to failure testing on each to see true maximum continuous and burst capacity. For the anti-spark variants would also be good to see if these anti-spark features actually result in any significant reduction in resistance over cycles/time.
That's a good idea. I'll try to do that.
can you do a test on how many amps they can handle? can you include ic5?
Another interesting "aggregation of milliohms" might be happening at those screw on bus bars!?! (we can not torque down those nuts too much!)
That is very true. I might test some Anderson Power Pole connectors soon - since I'm using those with the big LTO packs now.
Based on the current those connectors will carry, wouldn’t it make more sense to measure the voltage drop of them under load? When testing vehicle starting Circuits, you use voltage drop tests to find problems.
You can easily calculate the voltage drop. If I simply measured the voltage drop, it wouldn't be a fixed number; it would depend on the voltage used. Also, keep in mind resistance will go up as the connectors heat up. But you can calculate the heat build up too. Here's how: use Ohm's law - V=IR or put another way, volts = current x resistance. So let's say your connector has a resistance of 10 milliohms, or .010 ohms. If your current is 250 amps, the connector will drop 250*.010 or 2.5 volts. The connector will also have to dissipate 625 watts of heat (!) - use this formula: P=VI. Or Watts = Volts x Current; in this example 2.5 X 250. Obviously, one of these small connectors will melt pretty quickly with that much heat. But then again, none of these connectors were that bad.
That's actually exactly what a milliohm meter does, and why it has 4 leads instead of 2. 2 of those leads pass a fixed current through the connector, and then the other 2 are measuring the voltage drop. so if the meter passes 1A through the connector, then the voltage it reads is the resistance of the connection R=I*V or R=1.000*V
Best rc connectors are qs8 or qs10
I'll look into those. But now I'm using real Anderson Power Poles - the 175 amp ones. They dwarf all these combined. But these RC connectors still have their uses.
Qs8 are over 200amps
Hmm I actually found this because I was on there search for low resistance connectors for mA measurements so I don't have to solder the wires directly.
If you are using the actual Dean connector, test isn't really valid.
XT90 can you test?
At some point - I'm building a new place 1,600 miles away right now. But an XT-90 is probably similar to an EC8.
@@AlexLTDLXyeah said to be 0.55 for xt60 and xt90 = 0.3mohm
DEANS 1.4 mΩ
EC3 0.8 mΩ
XT60 0.5 mΩ
EC5 0.5 mΩ
EC8 0.2 mΩ
Lol - I actually go back to some of my videos to find data. You posting this is saving me time - thanks!
What about the XT90?
I didn't have a set of xt90's on hand at the time (ironically, I do now). I'd guess they'd be somewhere between the EC5 and EC8.
Good video. Would like to have seen the XT90; however, I'm not using any of them. Also, I'd like to see the difference between EC5's with what I call a wire basket and the segmented pins.
I can try to do that in future.
Comment for the algo
Thank you sir.
You need a better meter. Measuring by LSD of your meter is not accurate.
This method is a waste of time and a very inaccurate way to determine how the connectors will perform in their intended application. The correct method which is much more accurate and provides consistent results is to apply a constant high current through the connector being tested and measure the voltage drop across its terminals directly with a mV meter You will need a power supply capable of providing at least 50A, if not higher as todays RC planes, cars, helicopters etc can draw as much as 100A or so. This method will also highlight any connector deficiencies such as long term overheating problems.
" The correct method which is much more accurate and provides consistent results is to apply a constant high current through the connector being tested and measure the voltage drop across its terminals directly with a mV meter" This is pretty much what a milliohm meter does, like the one seen in this video. See how it has 4 leads? Two are used to apply a constant voltage through the connector, while the other two leads messure the voltage drop.
Sorry, but you're wrong..
This method is much easier, and very accurate.