LVC Devices - Any recommendations??

[Darin Jordan]

Hey Guys,

Many clubs are starting to move toward using the SV27 power system for some of their spec classes... Our club will have LSH, P-OPC Spec Tunnel, and P-Spec Mono running this power system for next season...

Since all of these classes will use Lipos (in our club anyhow), I think it's prudent to run a Low Voltage Cutoff device, since the SV27 ESC doesn't have one built in...

I'm looking for information from people with experience using these devices and that might be able to recommend something...

I've looked at the Dimesion Engineering LipoShield so far... ( http://www.dimensionengineering.com/LipoShield.htm )... if you've used this, I'd be interested in hearing your feedback...

... if there are any others out there to consider, any information you could provide would be greatly appreciated...

Thanks guys!

[Ctonez]

I thought you were the know-it-all of RC boating?!?
That's the word on the streets anyhow...:D

[Flying Scotsman]

Good question Darin

I also would like some feedback, especially with batteries wired in series. As I find some ESC's do not have a high enough voltage cutoff for my taste.

[Avanti]

I thought the SV esc did have lvc am I missing something?

http://www.rcuniverse.com/forum/m_4752309/tm.htm

I know that in this stupid long thread they say that there is a lvc in the stock esc.

[Darin Jordan]

I thought the SV esc did have lvc am I missing something?

http://www.rcuniverse.com/forum/m_4752309/tm.htm

I know that in this stupid long thread they say that there is a lvc in the stock esc.

Thanks for the link... I'll have to check that out... If it DOES have an LVC, that'd be new news... and good news!

[Ctonez]

I did a search for "SV27 low voltage cutoff" and found some good info.

Yes, it has an LVC. It detects your voltage when you plug the packs in and sets a cutoff based on that number.

[Flying Scotsman]

Ctonez, what is that number, if it is 3.0v it is too low for boat use. Please supply your documented good info

[Ctonez]

Sure!

from Rex R on this forum:

Rex R09-17-2007, 05:55 PM
LVC is set at 67% of the voltage at the time you plug in the batts. this is what makes it risky to run lipos...it will work(sorta) IF the lipos are FULLY charged when you energize the esc, however if you start with a couple of packs that are not fully charged (say during prop tests or setup where you run a minute or so then unplug to twiddle then go back out) you'll run the lipos down to far. standard prochedure; if/when the boat quits the 1st time(during a run) is to give it a minute(60sec) with your finger off the trigger, then try it and bring the boat in at low speed. you should have just enough power to make it back.

[SJFE]

I have been using the liposhield I bought from allbattery. It auto detects the cell count & voltage. Is good up to 4s & is under 20 bucks. Its survived water and heat. Solid unit IMO. I would like to try out a cellpro next.

[JimClark]

Novak makes one also. I have a 2s version but have not tried it yet. But they make a 2, 3 and a 4s version for under $25.00

http://www3.towerhobbies.com/cgi-bin/WTI0095P?FVSEARCH=lipo+cutoff&search=Go

[Steven Vaccaro]

Now that i think of it I would suggest using a esc with it built it. Having a external lvc in racing is another item that can break or come loose. What about using the proboat esc, its water cooled and can be programmed.

[Flying Scotsman]

I need an external device up to 8S that will support 3.4v cutoff. Any ideas. The OEMRC's are limited to 3.00v

[Flying Scotsman]

I thought you were the know-it-all of RC boating?!?
That's the word on the streets anyhow...:D

Corey, a bit of base and if you can supply some intersesting FE info rather than bashing another member, that would be great. Yes, Darin can be in you face at times, but generaly speaking, he knows his stuff.

Douggie

[Ctonez]

Sorry about that...not a bash at all, Darin and I are friends. I was just poking fun ...seemed better to do it in a thread that isn't so controversial.

...and I thought I DID supply some FE info in my following posts...you may not have found it interesting, but I tried...LVC @ 67%. Isn't that what you wanted to know?
Darin has taught me a TON about FE...and we've had some great duels on the water too. He has my complete respect.

-Corey

[Flying Scotsman]

Corey, I thought it was a bash and I am wrong if your last post is correct. Bye the Bye LVC @ 67% means nothing. 3.3v or ? per cell is correct