4S goes into half speed in 3 laps, while 3S runs for over 40 laps?

[Make-a-Wake]

Yep, disable the LVC.

[oscarel]

Thanks Alexgar.Still would like someone to tell me how I can test the actual lvc number for my particular ESC and also also why it would function reasonablly for a 3S configuration and not the 4S?

Dave

Eagletree or some sort of recorder will tell you. Is it set for auto-detect, as in does it beep the number of cells when hooked up?

[oscarel]

A couple of points from the manual. You can program the esc with the transmitter if you truely believe it's lvc. It's on Hobbykings site just above where the comments are there's a tab that says files, click on that and the manual is there.

Note: 1. Parameters with asterisk * behind is the default settings of ESC. LVC Is preset In ‘6.0V’ In factory.
2. The throttle range can be read on PC after installing ‘Turnigy® A q u a s t a r E S C ’ software. It is Auto changed
after calibrating the throttle range of transmitters.
3. When use Lipo-Polymer battery pack, please carefully set the LVC to efficiently protect the battery against
discharging.

[drwayne]

3s 11.1 v x 2,045 kv = 22700 rpm
4s 14.8 x 2045 kv= 30266 2pm

as you can see the 4s is using lots more power so draw will be a lot more. If you are looking for more run time with your 4s setup get a lower kv motor.
I was told around 30,000 for racing or 25,000 for sport boating.

hey, roadrash . pst...
1945Dave charged
4S with 1500mAh = 2.2kw ... 3 laps = 733W/lap @ 30266rpm
3S with 2870mAh = 3.2kw ... 4 laps = 800W/lap @ 22700rpm
minimal difference, Id say 4S better for the grin status with this boat.

How did you program ?
This could be a matter of 5S setting used with a 4S pack...
5S 3.0LVC=15V
4S fully charged is 16.8 .. after a few(3?) laps esc claims LVC.
If using autodetect.. dont..
Either set per pack voltage.. or use external lvc
( never run without lvc or that extra show off lap may well be your last use of that pack/esc/boat )

Not cured yet ?

If the series cables are short and connections good, Id be wildly gesticulating at poor 2S pack(s)
Bad packs ? Some packs drop voltage under load, lvc thinks too low and stops the fun. Pack v returns ok on later check, a classic wtf moment, hey.

7.4V(2S) is storage voltage.. charged shpuld be 8.4V.. the packs already near LVC if that's the case. (14.8V when 3.0vlvc is 12V)
Grab a multimeter and check voltage just before and after a run.. it helps greatly to know this.

Hope this helps you solve the puzzle.!

regs
W

ps Turnigy Aquastar 120 is relabeled Swordfish120 .. all progboxes and usb gadgets are the same

[drwayne]

Now I debt know the answer and I have to saw my big ezrun 150a esc in my 1/8 trug does this and if I.come to a complete stop and then.it will go.full.power then.lvc then the.same. I don't know why it does it but I'm like the guy.above. Just answer why.and help instead of telling "the.notorious turnigy" I want help and sounds like the guy above does too.

Sent from my SPH-D700 using Tapatalk 2

It's either overheating, or loaded draws down to LVC.. by releasing the throttle, it resets the esc.
W

[masonis1]

What should I do to fix this?

Sent from my SPH-D700 using Tapatalk 2

[electric]

Now I debt know the answer and I have to saw my big ezrun 150a esc in my 1/8 trug does this and if I.come to a complete stop and then.it will go.full.power then.lvc then the.same. I don't know why it does it but I'm like the guy.above. Just answer why.and help instead of telling "the.notorious turnigy" I want help and sounds like the guy above does too.

Sent from my SPH-D700 using Tapatalk 2

Turn off the LVC. Here is the tool to do it with. http://www.offshoreelectrics.com/pro...-seaking-pcard
Good for the turnigy and seaking esc's

[masonis1]

I have a programming card. Ill give it a try. It even does it while running on my rc10

Sent from my SPH-D700 using Tapatalk 2

[JIM MARCUM]

Turn off the LVC. Here is the tool to do it with. http://www.offshoreelectrics.com/pro...-seaking-pcard
Good for the turnigy and seaking esc's

I'd give that a try Dave. JIM

[1945dave]

Don't have a data recorder. Yes the ESC is set to recognize the number of cells and does give the confirming beeps.

[1945dave]

Okay, my programming card will allow me to turn off the lvc but then how will I know how much time I can run before risking damage to the batteries? I don't mean how can I do the timing just how much time do I allow for?

[martin]

If you dont want to risk timing runs you can use a low voltage buzzer alarm or better still a Lipo Shield low voltage cut off.

[oscarel]

Okay, my programming card will allow me to turn off the lvc but then how will I know how much time I can run before risking damage to the batteries? I don't mean how can I do the timing just how much time do I allow for?

If you have no way of recording the only way would be to run it for a specific amount of time and see how much you put back into the cells. Using the calculator here if you draw 100amps constant from 5000mah pack you will have 3 mins run time.

[1945dave]

In real terms my problem going back to the initial message at the top of this thread, I stated that the lvc took control and when I charged the batteries after that session it took 1500 ma to top off the batteries which were 4,000 ma batteries. I have no idea how much current my setup draws but the point was that by no means were the cells depleated enough to justify going into lvc mode.

I have looked before and will buy one of the recommended lvc devices but all the regular sorces are out of stock. any suggestions?

[dana]

I've mentioned this in other threads but nobody ever listens, but here goes. Raise the prop outta the water. The loaded prop is causing lvc to kick in. By raising the prop, you can reduce the load on the esc, and run fine with lvc set to 3.0. Hope you take my advise, and lmk if you try and it works.