T-180 lvc

[wilsta67]

hi all, im running a t-80 in a spartan on 6s
i have read that these esc's cut out earlier than wht the settings are.
now to start with i had it set to cut off at 3.2 volts when i bought it back and put the batteries on the charge they were reading 3.8 volts per cell.
so i dropped the lvc on the esc to 3.0v on testing again until the lvc kicked in i brought the boat in and the batteries were reading 3.7 volts.
so would i be safe to say i could set the lvc to 2.8 volts and see how that goes ?

[Alexgar]

It hits that voltage under load it's going to engage and maybe they are recovering as you bring it in I wouldn't risk it

[785boats]

so would i be safe to say i could set the lvc to 2.8 volts and see how that goes ?

NO!
Set it back to 3.2V
As Alex stated it hits the LVC under load, & under load your batteries are dropping about 0.6-0.7 Volts.
The voltages you are measuring are the 'Resting' voltages without any load.
You will be overdischarging the packs if you drop the LVC lower than 3.2.
Cheers.
Paul.

[wilsta67]

ok thanks

[6sHyper]

Also something to take in to consideration would be the C rating of your packs??? if there too low that lvc is definately going to kick in prematurely under load when the batts cant deliver.

[Make-a-Wake]

The big question is your packs? What mah and C rating are they??

[wilsta67]

Also something to take in to consideration would be the C rating of your packs??? if there too low that lvc is definately going to kick in prematurely under load when the batts cant deliver.

i have noticed this i have a set of venom 35c 5000mah and the lvc kicks in almost straight away with these where on the other hand i have a set of nano tech 45-90c 5000mah and they are ok they last about 3 minutes??
the motor is a cc1515 should i disconect the bec and run a separate power supply? would this help any?

[6sHyper]

The external power supply wont change how the lvc reacts as far as i know. Both sets of batteries you are using should be adequate. Some of those T180's have lvc issues, i know one of mine does, i just run it with lvc turned off and i time my runs, another option would be to buy a cheap external lvc, like the liposhield, they are much more accurate from my understanding.

[wilsta67]

The external power supply wont change how the lvc reacts as far as i know. Both sets of batteries you are using should be adequate. Some of those T180's have lvc issues, i know one of mine does, i just run it with lvc turned off and i time my runs, another option would be to buy a cheap external lvc, like the liposhield, they are much more accurate from my understanding.

how long do you time the runs for?

[6sHyper]

Well in my case i always bring my boat in every minute or 2 just to check temps and stuff, so when my packs read 3.85 I call them done. I'm using zippy 30c 5000mah. The length of the run i get is dependant on what boat i'm running, i know with my apparition 32" cat i could get about 5 mins on 6s1p, where as my Df33" mono i was only getting about 4 mins on 6s1p. So with the routine i use of bringing them in so often its usually 3 sessions and my batts are done.

[785boats]

The advice by 6s Hyper is rock solid. You've got to get to know your packs.
Firstly I wouldn't use those Venom packs. I sounds like they have huge voltage sag under that load & this WILL cause damage to your ESC .
Possibly the most important thing to know is how much capacity is left in your packs at the cutoff point.
Remember, it is advisable to have 20% capacity (in mah) left in the pack after the run.
In your case with the 5000mah packs that's 1000mah.
So either check it with one of those battery testers that show the capacity left , or more accurately, take a note of how many mah's go back into the pack when you recharge it. It should not be more than 4000mah.
Try the following with a fully charged pack. It's what I do for new setups & packs.
Start the timer & run the pack to the 3.2V cutoff. Write down the time.
Check the resting voltage . Write it down.
Recharge the pack & check the Mah put back into the pack. Write it down.
Do the math.
If, for example, you ran for 2.5 minutes. with a resting voltage of 3.85V & only put 2800mah back in you could run for a bit longer.
If however it ran for 4 minutes, with a resting voltage of 3.8V & took on 3,860mah, I would say that is the limit for that pack in that setup.
These are just random numbers & may bear no resemblance to your real numbers.
But the main thing is to know what resting voltage & what time for the run leave you with 20% capacity in the pack after the run.
Be sure to check all the temps too. You might need to check them during the run too.
It's all a part of the testing procedure for a reliable boat setup.
Cheers.
Paul