START HERE |
|
Register | FAQ | PM | Events | Groups | Blogs | Calendar | Mark Forums Read |
Unregistered
|
600 Class Electric Helicopters 600 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar. |
|
LinkBack | Thread Tools | Display Modes |
04-24-2015, 03:39 AM | #1 (permalink) |
Registered Users
Join Date: Apr 2015
|
Trex 600 battery connector question
Hey guys, thinking about making the jump to bigger helis, specifically a 600L. I fly 6s 3300 packs on my 500L but they use ec3 connectors. The nice thing about going to a 600 in my mind was having batteries that work with both 600 and 500 size helis, but my guess is that ec3 is too small to run the batteries in series on the 600. Any way around this? Or do I need dedicated ec5 6s packs for the 600? Have only been in the hobby for a year and am still unfamiliar with running batteries in series.
Apologize for the noob question but any help would be appreciated! |
Sponsored Links | |||
Advertisement |
|
04-24-2015, 11:29 AM | #2 (permalink) |
Registered Users
Join Date: May 2012
|
I use ec5 on my 500 & 600. To me it's better to keep it simple, one set of charging cables, no adapters needed. You can switch your connectors pretty cheap on the 500 and the batteries.
|
04-24-2015, 12:20 PM | #3 (permalink) |
Registered Users
Join Date: Jan 2010
|
The EC3 will be fine on a 600L. (Trex 600L Dominator uses a 12S battery pack)
It is rated at 60A continuous current. http://www.e-fliterc.com/Products/De...odID=EFLAEC301 And, it is compatible with your existing 500. Your 500 uses a single 6S pack, and most likely draws more current than a 600 would on 12S under the same conditions. This is based on the higher voltage of the 12S pack vs the lower voltage of the 6S. The helicopter flies on "power", not current. In electronics, power is another word for "watts". The formula for power is "Power = Current X Voltage" 745.7W = 1 horsepower. If your 500 took around 550W to hover, on a 6S pack (25v), the current draw is about 22A The 600 might need around 700W to hover, and on a 12S pack (50v), the current draw is about 14A. Personally, I use the EC5 on my 3300mAh 12S packs, but that is mainly for compatibility with other helicopters and battery resellers EG: Buddy RC sells their Glacier 6S 3300mAh 45C LiPo with the EC5 preinstalled. But, they do not sell the same battery with an EC3 I wouldn't change the EC3 unless you need to be compatible with something else. |
04-24-2015, 01:16 PM | #4 (permalink) | ||
Registered Users
Join Date: Jan 2015
|
I thought the same thing about having a 500 and 600. They share the same packs so they'd make a great combo to own.
The EC3 connectors are fine on 12s. Even the Dean's connectors are fine if you don't mind the PITA soldering and rather nasty 12s spark. There are Youtube demos of Deans holding 340A of current until the solder joint blew off... nothing happened to the connector itself. IMO, I'd only be motivated to change to EC5 on a 6s large heli. The current peaks are just scary. I've been at the field.. and a guy blew off his solder joint on a Deans connector with a 6s 600.
|
||
04-24-2015, 01:26 PM | #5 (permalink) |
Registered Users
Join Date: Dec 2014
|
... share the thoughts on having 6S 500 and 12 S 600 - I have the 600 but would like the 500 for greater practice opportunities (packs I have give 3 flights on 600 but would give 6 flights on 500).
FWIW I use 6mm connectors - the game that the connector people play is to rate as high as they can. Who can blame them? The real issue for me is the real vs. theory performance. It becomes very difficult to get sub 10 milli ohm resistance at a connector - this is another 20 or 40 milliohms on 6S or 12S set up (assuming 12S as 2 X 6S). This means that your 6S battery pack in good health is now suffering the equivalent of another 3milliohms/cell... this is assuming you have achieved 10milli ohms. Bottom line - you stand a much better chance of getting the best from your batteries by running at something bigger than the minimum for cables and connectors. Not everyone wants to do that and I am happy to be an odd ball! It's just my $0.02 and, as ever YMMV!
__________________
helicopters - levity whilst avoiding gravity? Nano-CPX, MCPX BL, T-rex 450 Sport V2 now FBL, T-rex 600E PRO/Vbar |
04-24-2015, 02:02 PM | #6 (permalink) |
Registered Users
Join Date: Jan 2010
|
A low voltage setup (6S) draws more current to provide the same power as a 12S.
Voltage drop across a connector is based on current flow and the resistance of the connector. Voltage drop also translates to heat. Too much heat, and you will melt solder joints Assume the difference between a EC3 and an EC5 is 0.01 ohm (10milli ohm) At 22A (6S) there is a 0.22v difference between the EC3 and the EC5 At 14A (12S) there is a 0.14v difference between them. Again, the 12S pack's higher voltage will produce the same power using less current. Less current is less voltage drop and less heat. Other than compatibility, there is no compelling reason to change the EC3 connectors to EC5 |
04-24-2015, 02:07 PM | #7 (permalink) | |
Registered Users
Join Date: Mar 2014
|
Quote:
|
|
04-24-2015, 02:19 PM | #8 (permalink) |
Registered Users
Join Date: Jan 2010
|
Fun facts:
EC3 rated at 60A continuous XT90 rated at 90+ continuous (I have no clue what '+' means. Could be 91A or 190A - no clues) EC5 rated at 120A continuous. |
04-24-2015, 02:28 PM | #9 (permalink) |
Registered Users
Join Date: Jan 2015
|
I also REALLY like the XT 90 connector. They are so solid when you connect them. You can literally feel it.. like tight in a good way. Not too difficult to connect either.
They are kinda like half bullets to solder on. Half of the bullet is open and where you drop the solder. Its pretty genius and I love how it seals and envelopes the wire with solder. I give them a 5 star rating. I'd already have changed over.. but all my balance boards are Deans. I'd also add that a continuous rating only means that the component can sustain that current for a designated period time without changing its temperature or damaging the component.. It doesn't mean it will positively fail if the current goes over. As in the case of the Deans... the current can go waaaay over... and the component survives. Though it'd probably burn off a few layers of your skin. |
04-24-2015, 11:05 PM | #10 (permalink) |
Registered Users
Join Date: Jan 2010
|
Fun fact #2
Deans rated at 40A. http://www.tjinguytech.com/reviews/rc-connectors Funny thing, the Deans has the lowest rating of any of them. And, they are all over-rated for use on a 600 sized heli. |
04-24-2015, 11:46 PM | #11 (permalink) |
Registered Users
Join Date: Jan 2014
|
I share packs in my 500 and 600 now.. I use the Zippy Compact 3300 35C packs... Works well and keeps my battery count down. I use the XT90's plugs on both.
The 2700MAH 35c Compacts were just a little under weight in both Heli's..... With the 3300 my balance is right on with the right placement of the ESC ... FBL Controler.... and BEC's HAVE FUN with it !
__________________
KDS Agile 6.4 Proto-Type 750MX 12s with an Ikon / KDS Agile 7.2 / Tarot-Align 600CF-FBL Robird G31 12S / The First X3-385 FROM AUTO-CAD to DIRT NAP in 10 SECONDS ! |
04-25-2015, 02:48 PM | #12 (permalink) |
Registered Users
Join Date: May 2011
|
Keep in mind that when setting up the 12 S system both batteries need to have the same Mah rating.
Otherwise it is a great thing to share batteries. Gh |
04-27-2015, 01:39 AM | #13 (permalink) |
Registered Users
Thread Starter
Join Date: Apr 2015
|
Thanks for all the support guys! Like I said I am fairly green when it comes to electronics so It's great to have all of your input, my LHS is almost exclusively multi rotor pilots so its great to have discovered this forum .
Based on what you guys are saying I think I will stick with the ec3 connectors in series and keep track of heat at connectors during my maiden flights. Although I mostly fly sport for now, I do want to get into more 3d flying so I want to make sure my connectors will be able to handle all the draw when I start throwing the thing around a little more. Last thing I want is to see the thing drop out of the sky like a brick because a connector came loose (already happened once with my 500L due to bad solder joint), fortunately damage was minimal. |
04-27-2015, 01:04 PM | #14 (permalink) |
Registered Users
Join Date: Jul 2010
|
It is quite easy now days to integrate in an economic separate flight pack to power your electronics in case of a main connector failure. I have had two go south, both I assumed had been soldered correctly by others. Now I do it all myself, and use EC5s, only because that is the prevailing connector being used by all the guys in my group with their charging stations at the field. I used the XT90s previously. And XT60s before those.
Just remember, twice the voltage half the amps. Amps are where the problem lies. Today I still run my same ole dual 3300 packs in my 600 and have never had any issues.
__________________
If it can be done wrong, I will find a way to excel at it. |
Thread Tools | |
Display Modes | |
|
|