LVC buzzer problems HELP

[Mattwarner]

Hi, I run a genesis with a leopard 4082 and T180 on 6s and following some advice from properchopper I set the esc to no LVC and brought some plug in buzzers which I set to 3.7v

My problem is that after only a few (maybe 2) minutes runtime I get beeping when at 2/3 to full throttle which stop at part or low throttle, my packs are Turnigy 40-50c & zippy 45-55c 5000mah (does the same on both sets of packs)

Is it because my packs are under strain? My prop is an x443 so I should be safe on my amp draw

Any advice?

[dana]

yes i believe so. under load of the prop, battery voltage drops. if the lvc is set too high it will kick it in. i think that what your asking?

[Alexgar]

3.7 is kind of high try 3.4

[Mattwarner]

thanks dana, is 3.7v too high?

[Alexgar]

Ive heard betwween 3.2-3.4 keep in mind these are under load so the recovered voltage will be much higher

[Alexgar]

I run my lvc at 3.2

[Mattwarner]

Thanks that makes sense!

[TheShaughnessy]

3.7 v is what a lipo cell is rated at. You just set your cut off voltage too high. 3.4 is even on the high side IMO. I'd set it at 3.2 maybe even just 3.0 to compensate for some sag.

[sailr]

I bought some of those things to put in my airplanes and the danged things beeped the whole time they were plugged in! Also got a lot of glitching. I unplugged the bugger and everything was back to normal. Hobbyking crap. What can I tell ya!

[Mattwarner]

As it stands I just time my runs as they beep like I've said but are handy to read the voltage levels when I bring her back in.

What's the recommended voltage I should let the packs drop to (at rest) obviously if they are set to buzz at 3.2v under load they will probably be around 3.5v at rest?

[properchopper]

Matt, another way to get a handle on how your setup translates to battery drain is to time your run for a fixed interval; let's say two minutes of normal running. Then recharge your batteries and observe how many mAh are consumed. Divide by minutes ran - in this case 2. This will give you mAh/minute. If you have 5000 mAh on board, you can run for 2.5 minutes to take 50% out of your packs. I routinely go as low as 25% for race setups with no apparant battery degradation or heat. This picture shows the slope of voltage drop on a tired Turnigy battery (blue is voltage)

DSC01752-1.JPG

As a believer in cutting-edge technology, I routinely use the Porkmaster 2000 Lipo Saver/ Run Timer to time my test runs :

http://www.youtube.com/watch?v=tvQbEnwjNSU

Tony

[sailr]

Gotta love that timer! Thanks for the belly laugh!

[dana]

Huh huh.... Pork master .... Huh huh. Oh Tony, you always make me chuckle )

[Drax21]

I bought the 8s beepers with the cell voltage readings(can be used on 2-8s). It beeps at 3.4V every time. Great seeing as the LVC on the Turnigy and Seaking Escs hardly ever work now.

[Mattwarner]

That's what I have, it's the same as this:

http://www.ebay.co.uk/itm/2in1-RC-LIPO-Battery-1-8S-Cell-Low-Voltage-Meter-Buzzer-Alarm-Checker-Indicator-/330719209774?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item4d0066a92e#ht_3136wt_922