700 Size Power: BEC or RX Pack? - HeliFreak
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View Poll Results: What power system do you prefer for a 700 size electric?
BEC 37 26.43%
BEC + UPS Backup 41 29.29%
RX Pack 49 35.00%
RX Pack + UPS Backup 12 8.57%
Other 4 2.86%
Multiple Choice Poll. Voters: 140. You may not vote on this poll

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Old 01-10-2017, 12:38 AM   #1 (permalink)
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Default 700 Size Power: BEC or RX Pack?

I know this is a matter of opinion, so what's yours? What do you prefer to run on a 700 size electric heli, a 2S LiPo, a BEC, some combo?
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Old 01-10-2017, 12:55 AM   #2 (permalink)
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Run these on both 700's and my 800, BLS275/276 w/CGY750's on all. Flawless to date.
http://www.western-robotics.com/wrl-hbecsp

Use to run a 2s lipo, was a pain. The bus system on this BEC eliminates any bottlenecks, and ensures full power to all servos. Only caution is to be sure it has proper ventilation.

Power consumption from 12s 5000 = app. 10-15 seconds less flight time.
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Old 01-10-2017, 01:00 AM   #3 (permalink)
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Kosmik BEC, bulletproof.
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Old 01-10-2017, 01:04 AM   #4 (permalink)
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I use the Align/HW ESC's BEC and an Optipower Ultraguard as backup for my 700X.
From what I heard the Hobbywing BEC is very good and most fly their t-rex with just that but the Ultraguard is very light and easy to install. It is worth it to me to invest those few grams for a bit more safety.
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Old 01-10-2017, 01:08 AM   #5 (permalink)
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2s all the way
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Old 01-10-2017, 01:11 AM   #6 (permalink)
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Using a HW / Align ESC + Optiguard combo

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Old 01-10-2017, 01:36 AM   #7 (permalink)
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I use 2S or BEC on different birds, don't have a problem with any of the solutions. I do feel 2S is a little bit safer, as a main pack connector can get unsoldered in flight.

BEC + backup seems like an expensive hassle to me, have not tried it.
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Old 01-10-2017, 01:44 AM   #8 (permalink)
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I've been thinking about this a lot recently, I'm building a 700n and not too sure which way I'm going. It's got some power hungry ds8717's. I'm thinking of going with a 2s life battery, most likely to a buss bar to avoid taxing the FBL buss and having brown outs.

I will likely get some brushless HV servos later on and go 2s lipo, but it's a ways off. I generally like to keep things simple, less to go wrong that way. Electric would be another story.
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Old 01-10-2017, 02:01 AM   #9 (permalink)
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Depends on setup but keep posting this, contains some interesting info on power setup tests:

http://www.vstabi.info/en/node/1327
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Old 01-10-2017, 02:32 AM   #10 (permalink)
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Internal bec
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Old 01-10-2017, 02:40 AM   #11 (permalink)
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The option for ESC with internal BEC seems to be missing? That's what I run most of my big helis on. (Hobbywing ESC's or Align rebranded version)
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Old 01-10-2017, 02:47 AM   #12 (permalink)
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On my 700's and bigger always use a 2s Lipo or LiFe with voltage telemetry and alarms. A 2s pack is a reliable solution and the telemetry means you can never take off without a charged pack. I feel adding backup guards to this increases the complexity with very little improvement in reliability.

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Old 01-10-2017, 03:38 AM   #13 (permalink)
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2S lipo directly connected to the power bus on the Beastx HD on both 600 and 700 size. Only the my 380 size uses the Hobbywing bec.
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Old 01-10-2017, 05:59 AM   #14 (permalink)
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What exactly is a BEC with UPS backup?
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Old 01-10-2017, 06:06 AM   #15 (permalink)
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On my logo 600 I use a cc bec pro with a 1300mah 3s
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Old 01-10-2017, 06:08 AM   #16 (permalink)
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Quote:
Originally Posted by JesusFreak View Post
What exactly is a BEC with UPS backup?
He means a BEC with an Optipower 'Ultra-Guard 430' (or similar) backup power supply.
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Old 01-10-2017, 06:12 AM   #17 (permalink)
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Quote:
Originally Posted by CompleteDestruction View Post
On my logo 600 I use a cc bec pro with a 1300mah 3s
Why not power the BEC from the main flight battery?
That's why they are called 'Battery Eliminator Circuits'.. They are intended to eliminate the need for a separate Rx battery.

Otherwise just use an Rx pack with no BEC?
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Old 01-10-2017, 06:19 AM   #18 (permalink)
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Quote:
Originally Posted by JesusFreak View Post
What exactly is a BEC with UPS backup?
Two different things. A Bec is supplying power by lowering voltage from lipo votage to 6 to 8.4volts. Usually you can set the voltage yourself.
This can either be done by buying an ESC with built in BEC like the Hobbywing 130A. Align ships these with thewir super combo for example.

You can also use an ESC without BEC and buy a separate BEC that does the same.

The UPS backup is a separate device with a built in small lipo that detects when the voltage is sagging. In that moment it feeds power from the small lipo. That way the heli does not loose connection in case of catastrophic powerloss by the ESC/BEC. I use an Optipower Ultraguard for that but there are other ones too i guess. Costs about 45 $ wich does not seem much especially when talking about 600 or 700 sized helicopters.
It does charge itself from the lipo so it is really pretty damn foolproof.

If it only needs to switch on once it has paid itself many times.
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Old 01-10-2017, 06:25 AM   #19 (permalink)
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2S lipo for me.

But i've never had a BIG ESC with internal BEC.


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Old 01-10-2017, 06:27 AM   #20 (permalink)
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External BEC with small backup battery all the way.
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