Emaxx w/4 battery packs?

[SVORay]

While surfing for battery packs and charger yesterday, I found a chassis for the Emaxx that holds 4 sticks. Is anyone running one of these out here? I'm looking for some pros and cons on this set up. I reallize it's added weight but will the run time double? Also will the extra run time ( if there is some) over heat the motors bad? I notice my sons motors gets a little on the warm side and so we usualy wait a few minutes before poping in a freash set of sticks for it.

Thanks
Ray

 

[bustedgears]

Depending on the wiring, it could be double the run time (in theory).

Wire each lead for parallel then it should work fine.

As far as overheating is concerned, I'd cut a hole in the windsheild to cool everything off well during the run.

Let us know.

 

[Plaidfish]

Would you wire 4 parralel packs or 2 sets of 2 packs in series??
isn't teh E-maxx capable of 14.4VDC

 

[SVORay]

The chassis comes with the connectors already done up to connect all 4 packs. As for what the stock 14.4v set up, I'm guessing once your through with this, it want be a typical Emaxx anymore. The chassis w/connectors runs 109.00 bux alone and I'm sure you'll have to dish out some extra coin to install a speed control that would handle it. I would post a link to one but I can't find them on ebay anymore. It's probaly better to shell out the extra coin on some really good batteries I guess than to do this convertion.


Speaking of batteries and 14.4 systems....Do you have to change the speed control to run those 7cell 8.4v packs?


Thanks
Ray

 

[bustedgears]

The stock speed controller is the Orange EVX by Novak.

The setup is 14 volts out of the box and it has two plug leads to go to each battery.

If you wire each side in parallel like this

 

[SVORay]

That is how their connectors come with that chassis. I'm guessing no one really does the 4 pack chassis out here? So I'm guessing it's simply better to use the coin on some bettery sticks instead of trying to run 4 sticks at a time? Now has anyone run any of those 7 cell sticks? They got an odd cell humped out at an angle. Just wondering if those helped a little on the run time.


Thanks
Ray

 

[Candyman]

All things being equal, adding another cell to the pack shouldn't affect runtime. It will increase the pack voltage, but the runtime will still be determined by mAH of the batts you're using. However, wiring in parallel does effectively double the current without altering voltage. That's why in busted's diagram you should get roughly twice the runtime while still only running at 14.4v.

 

[vbgagnon]

Candyman it all depends on how you wire it. If you wire it in series (like the batts in your tx) then the voltage is added up, thats how you get the 12 volts for the tx. But when you wire in parallel you connect all the positives and all the negatives you keep the voltage, but add up the Mah rating.

So really you will get longer runtimes if you run @14v.

 

[SVORay]

But when you wire in parallel you connect all the positives and all the negatives you keep the voltage, but add up the Mah rating.

So really you will get longer runtimes if you run @14v.

Sounds interrestingonder2:

 

[Candyman]

I think that's what I said. OK, simple. Batteries wired in series will add voltage. It's like putting 2 AA batteries nose to tail. You end up with 3.0v (1.5v X 2). However, if you wire them in parallel (+ to +, -to-) you will double the current capacity, while keeping the same 1.5v overall.

 

[vbgagnon]

Is there something you don't understand? I can go a bit more into detail if you would like.

 

[vbgagnon]

Thats exactly correct Candyman.

 

[SVORay]

Is there something you don't understand? I can go a bit more into detail if you would like.

That works for me :hi:

I'm just not sure it's worth the coin to do the set up. I think for right now I'll wait and see what those GP3300's are going to do for us. If they do well, I'll move up to some GP 3700/3800's. I also found a guy about to run some 4800LIPO's on an Emaxx. That is a bit out of my range right now but hopefully they'll come down a bit once people starts using them more.


Ray