evx and lipo

[suicideneil]

I like the buzzar type alarm that plugs into the balance plugs- 3.0v per cell stock setting is about perfect. For you, a 2s version would be correct- just solder on the white connector or solder the red & white wires directly to the battery plug coming from the esc (BEC side, see bottom). Once the battery starts dropping off in voltage near the end of the run, it will buzz more frequently:

http://www.hobbycity.com/hobbycity/s...ery_Monitor_2S

There is also a version with a red LED instead of a buzzar- mount it somewhere like in a window on the truck so that you can easily see it- the more often it lights up, the more discharged the lipos are becoming:

http://www.brchobbies.co.uk/?page=sh...dditem&item=70

I have one of those and it does work well- bright LED. Dont use it anymore though as my setup is rather different compared to my old hvmaxx powered setup.

If you want a more adjustable lvc device, take a look through the hobbycity website section below:

http://www.hobbycity.com/hobbycity/s...6&ParentCat=85

Lots of interesting recorders and monitors.

To wire up the 2s lvc, follow this diagram:



Enjoy

so you wouldn't recommend an actually cutoff? More of visual and hearing to notify yourself that the batteries is below 3.0v huh?

http://www.hobbycity.com/hobbycity/s...itor_2-8S_Lipo

I like this, is it too much?

[suicideneil]

Thats one of the best they sell- very adjustable, and $30 isnt that bad, especially since you can use it in other models with larger lipos in the future.

Whether you use a true cutoff like the novak 2s smartstop, or just a buzzar/alarm is personal choice really; I dont really like the idea of a hard-cutoff, I'd rather be warned that the battery is loosing power so that I can bring it in top my feet, rather than have the truck grind to a halt or start acting erracticly whenh you hit the throttle. The adjustable cell voltage of the alarm above is beautiful though, as is the logging feature for max and min voltages during the run- not that the stock emaxx should put much strain on the lipos, but all the same..

if i were to use that, how would i come about connecting that onto the EVX controller? looks like a balancer tap is needed. My hard case lipos have no balancer tap, only when I charge them, I use the balancer tap.

[suicideneil]

Ah, that could be slight issue, but there is a work around, of sorts. You would need to buy a single 2s lipo male balance plug (jst-xh/ align style) with the wires pre-attached, and solder it (first & third pins/wires) to one of the esc's battery connectors ( refer to that diagram I posted earlier to work out which one). Then, you would just need to plug in the lvc device to that balance plug to monitor your lipo during use- you wont be able to read the individual cell voltages though since you cant hook up all three wires on the balance plug, not unless you add a little bullet plug to the middle wire and plug that into the little hole on the lipo ( I take it you have hard case lipos that have 2 large and one small female bullet built into the case?).

[BrianG]

Will this diagram help?



You could make a pigtail connector setup that looks like the above picture and permanently attach it to the lipo so you'll always have a balance tap and main wires no matter if you are running or charging.

[suicideneil]

Huzzar!

Im at work currently so cant do any drawings like I normally would- that diagram is exactly what I had in mind for a more permanent yet removeable work around

Now, when I get home I can steal it and pretend its mine....

[BrianG]

Careful with that. I set it up so if anyone outside the USA downloads it to their computer, it releases a virus that pees in your computer rendering it inoperational.

Additionally, if someone from England downloads the file, the virus also takes a nice dump too. So, not only is your computer broken, it smells too.

[suicideneil]

Curse you colonial swines!...

so 4s alarm or 2s alarm on Emaxx? what do you think Neil? Same price, but which one would save my batteries?

[suicideneil]

If you are using a pair of 2s lipos, then a single 2s LVC alarm is all you need, wired up as previously discussed ( see post #76 & #82 ).