Lipo wiring Question
 

I have a BK 12020 w/ wond 8XL set up UE spyder 8, Ue 6mm cvd 's & center, strobe 51 w 20pinon. Currently I am Have the 12020 wired for series 18 3300 promatch cells. I like this set up except for run time. I do like speed runs. I have ordered Apache 5s packs from mike. Should I wire for Parallel ?
Mike did mention it. Would the 12020 handle 5s in series? What would be the main differances between wiring 5s in Parallel & series.

Thanks to everyone in this forum, my truck runs very good, at least to me

If you had 2 5S in series that would make for 10S lipo and would be to much for the controller and motor. So yes, you need to wire the lipo packs in parallel.

Thats what I thought, I will play w/this set up parallel. Thanks for your reply.

One more question
 

Running my promatch 2 packs (9 cells ea) in parallel- in general what would I expect as run time & power? What about run time of the Apache
5s.

If you ran your two 9cell packs in parallel, you'd only get 10.8v, but 6600mah and twice the amp draw capability. The performance would be approximately half of what it is now.

Since you have two 5s Apache packs, you'd want to run them in parallel. This would give you 5s (18.5v) 7400mah, with a continuous discharge rating of 111amps, which means that these batteries certainely won't be the limiting factor in any powerful setup that you can put in an E-Maxx. For runtime I think you can expect about 30mins, depending on how you drive and what terrain you drive on.

I'm just starting to look into Lipos, I've read quite a few posts but i just keep seeing numbers and letters, 3s2p and serial parallel and I'm getting really confused, not hard i know! :002:,just seems you need a degree in electronics, I'm used to just throwing a set of NiMH batts in my maxx, could anyone give me a complete beginners breakdown of what these numbers mean and a diagram of how you wire these things up, i think my mind is making it more complicated then it really is.

This is going to be a big step for me going over to Lipos so i really wonna get it straight in my head before i start thinking of buying anything.

See if this helps any.
I'll be happy to give more explanation where needed :003:

http://www.rc-monster.com/forum/showthread.php?t=2250

3s2p means 3 cells in series and 2 cells in parallel making a total of 6 cells in the pack

The 3s meaning 3 cells in series tells you to voltage of the pack 3*3.7 which is 11.1V in the pack

and the 2p means that there is 2 lots of the 3s in parallel

wiring packs in series adds the voltage of the packs together and wiring them in parallel ads the capacity (mah) of the cells together

think that explains what you wanted to now as basicly as i can put it

I have recieved the Apache 5s from Mike and currently am rewiring my 12020 for parallel, I have waited a while to install because Mike was waiting on a new "car model" LVC . It is in route to me. This forum and "monster mike" made it easy to make informed decisions on what to get. It all seems much more simple now but am no expert. Mike told me to get the Hyperion LBA6 and got powersupply & two Multiplex chargers from the store. I also was just used to my NIMH's & this is a big step for me also. I should be running new LIPO set up soon & look foreward to a new level of performance. I can keep you posted if you like.

Yes, keep us posted.:027:

Monkey: cheers for the info think I'm starting to get it

Batfish: That link was very helpful, recommend it to all Lipo newbies.

lets see if I understood it correctly. 3s means 3 cells connected in series just like a standard Nimh pack, this adds the voltage of each cell together to give you the pack voltage, 2p means another 2 cells in parallel, now this is where I'm a bit fuzzy on, if each cell is 3200mah does each cell in parallel increase the pack mah by its 3200mah IE 3s = 11.1v 3200mah + 2p 3200mah+3200mah = 11.1v 9600mah? or does 2 cells only increase it by 3200mah?
I'm also a bit unclear on how you wire up 3 cells in series and another 2 in parallel, sorry if this is a bit of a dense question.

the 2P means twice the amount of cells you have in series so 3S2P is 3 cells in series and another 3 in parallel to them

2P gives two cells in parallel, doubling the capacity. A 3s2p pack using 3200mah cells is 11.1v 6400mah.

Monkey, that's one way to do it. The other way is to have 3 sets of 2P pairs (3.7v 6400mah) and then put those pairs in series. It still gives 3s2p, but it's a different (and better IMO) way to do it so there is still the same output.

yup i wasnt really talking about how they where wired just how they went together

Does anyone have a link to a picture or some kind of diagram that shows how the batteries are wired together in series vs. parallel? I actually understand the series but would like to see how parallel is wired.

I just drew up a quick diagram that shows the differences in the connections. Personally, I think the one on top is better because the group of cells in parallel function together as one cell, making balancing a lot easier. However, the one on bottom would work best if you used smaller packs in one vehicle (like a 1/18 car) that were then paralleled for use in a larger vehicle (like a 1/10 car).

nvm didnt see 2nd page

Li-Saver
 

Hey guys I have wired for parallel now and It is very clear with Li-Saver instructions how to wire to one Apachees 5s, but I am unclear how to include the second 5s battery. Do I just piggyback it to the other battery .?Then use one positive & neg set into Li-Saver

Any good diagrams out there? I do have a switch prior to the BEC before going to the RX.

Lipo wiring Help
 

Lipo Wiring Help

If the 2 battery packs are wired in parallel, then the LiSaver is connected to both batteries. In a parallel connection, both battery packs will be at the same voltage all the time. Another way you could connected the LiSaver is to the battery input leads on your speed control. This would remove any hassle that you might deal with by having it connected to your battery(s).

Thanks Metalman for your reply. The 12020 has 2 red & 2 blk coming out. I have taken one red to each 5s and one black to each 5s via deans ultra plugs. Mikes new "Car Version" Li-saver uses an ultra plug male & female harness w/ small gage wire hooked direct to li-saver . this is inserted btween the 12020 & battery,this takes care of
one 5s apachee, Can I make a simular harness for the other battery combine them together for a single parallel imput to the Li-saver?

Also I have the UBEC hooked to one 5s only w/ a switch in line. Is that OK? Will the ubec run one battery off or will Li-Saver detect that. I have disabled the 12020 bec.

thanks Mark

You don't need a switch on the UBEC.

The separate wires for the battery input are in fact connected to the same source on the circuit board of the 12020. So, anything connected to the input wires will use both batteries.

Thanks Metalman, just wanted to be sure, no mistakes will be easier on my $wallet! Just some minor wiring project left and I will be up & running. Have run it alittle & first impression is considerably more power.

That's always a good thing :). You have a crapload of power available to you using those two 5s packs in parallel. Each pack is capable of about 1600watt bursts, so total you have 3200watts on your hands! Just to give you an idea how much that is, if you had a motor that could take advantage of that, it would be at about 4 1/4 horsepower.

Sorry to ask this in your thread mark but can some1 tell me if this LiSaver makes it obvious enough when you batteries are dead if so where can i get one thatll ship to the UK will save alot of room in the setup im planng as apose to 2 cut of devices

Li-saver operation
 

Monkey I will hook you up with the info after this weekend of running it.
The li-saver claims it pulses the acceceleration. I will run it and find -out. The Li-saver "car version" came from "Monster Mike" . Stay tuned I will keep you posted.

Mark