goda know - Page 2 - RC-Monster Forums

Gustav · 12.25.2005, 07:43 PM

i've got the evo 20 3300 3s pack,haven't run it yet though,need to get a power supply and some banana plugs when the shops open.
I've got the flightpower 2-6s balancer,(made by duralite),i was told to charge at 1c when i talked to flightpower on the phone.What makes you think you can only charge at that rate?

stampy · 12.25.2005, 07:47 PM

"Brian,

Charging Through STAY BALANCE MODULE™ using DURALITE PLUSTM Brand Charger.

The module, when used in conjunction with the DURALITE PLUSTM Charger , also acts as a voltage limiting devise.

First plug in the MODULE & balance the pack before connecting the charger. Then plug the Module into the DURALITE PLUSTM Charger by connecting the yellow charging lead connections. Then begin your charging cycle. Although the balancer was designed to be used in conjunction with the Duralite Plus chargers it has been used with other chargers connected thru the yellow lead. You will need to construct a female adapter for your charger to plug into the balancer yellow lead. If you choose to do this, make sure that your charger is set at no more than 400 mah charge rate or .4 of 1 C."

i emailed duralite about hooking up there balancer to a diff charger

Gustav · 12.25.2005, 07:54 PM

Don't connect the balancer to the charger then.As far as i understand the balancer is not connected to the charger.The pack has a balancing lead which plugs into the balancer whilst charging.

What yellow lead is he talking about?

Sounds like he's saying if you connect the balancer to another brand of charger then you can't charge at 1c but you don't need to connect it to the charger anyway.

stampy · 12.25.2005, 08:06 PM

hum so you have a duralite balancer? and there no other wires coming out of it cept for the wires to the pack? are you going to use a duralite brand charger or somthing else?

Gustav · 12.25.2005, 08:16 PM

It has a plug on it that you plug the balancing lead on the pack into,it has another socket for a different size of connector-10 pin or 14 pin depending on your pack(this is the 2-6s balancer).

He must have thought you specifcally wanted to connect it to your charger so that it also acts as a 'voltage limiting device'.Maybe throw him another e-mail to double check.
You should be able to charge at 1C just connecting the pack to the balancer.
I'll be able to tell you in a few days once i get what i need and get to grips with my new charger.

Those pack dimensions are complete crap by the way,that's more like the length of the cells themselves.The 3300 3s actually measures 148mmx46mmx20mm.The 2500 should work well for you i think,the 3300 would have more amps and longer runtime if you could fit it in.

I bought a schulze 330D BTW,i need to work through the destructions when i get time,seems a little complicated to me.

stampy · 12.25.2005, 08:33 PM

Quote:

Originally posted by Gustav

Those pack dimensions are complete crap by the way,that's more like the length of the cells themselves.The 3300 3s actually measures 148mmx46mmx20mm.The 2500 should work well for you i think,the 3300 would have more amps and longer runtime if you could fit it in.

hum i hope it still fits:M: . its tight right now with the specs they have. ive only got 133mm leaght so that pack is just to long i think the bigest i can fit is the 2500mah :(

stampy · 12.25.2005, 08:42 PM

i wonder if those wires that the guy was talking about are the ones coming of the balancer, besides the ones for the batt pack, in this pic

you can see them on the left

Gustav · 12.25.2005, 08:45 PM

The yellow connectors are on their chargers by the looks of it.

There's a few mm to add to the quoted lengths to account for wires and and the wrapping.

These cells are basically the polyquest XP cells which polyquest rate at 16C but from what i gather flightpower are claiming that with their matching/selection and assembly(done at their own seperate manufacturing facility)they rate them at 20C.Some are sceptical claiming that the cells would get too warm at 20C and 30C peaks to hold voltage and that they'd be better rated at 16C.
(this is my electrically illiterate interpretation of the situation anyway:L: )

stampy · 12.25.2005, 08:55 PM

cool i sould have the room if the pack is only alittle longer than it is listed as. if the pack is only 16c its fine for me i dont think i can burn up a pack with this setup. i emailed them about the balancer agian, just asked if the balancer hooked up to a charger in any way. and i asked them about the extra wires coming off the 3s balancer. hopfully i will be running that setup shortly :p . tnks for your help gustav:cool:

crazyjr · 12.25.2005, 09:06 PM

what is the kv and amps rating of the motor? if it is over 5900kv and 100 amps it might be too much for those batteries, because 2500mah at 20c is a 50 amp draw and 30c is 75amp. I think you might be pulling too many amps for those batteris

Gustav · 12.25.2005, 09:17 PM

It's a 4400kv i think.The pack being light should shed some load off the motor.I'm not totally sure either.If it's true 50 amp continuous it should be OK though shouldn't it?

stampy · 09:23 PM

cant remember who told me this but i was told that with lipo you only need half the amps that your motor will put out for the pack like if the motor pulls 70amps then you need a pack that can take 35. ill try and find the post were i was told that

found it :You don't. My 8L was rated at ~80amps, and the batteries were 40amps continuous, and were fine. The motor's amp rating really doesn't mean anything. To be on the safe side, you would really only need something with 45-50amps continuous.:

metal man said that here http://www.rc-monster.com/forum/show...&threadid=1618

its like the 10th post down

crazyjr · 12.26.2005, 12:25 AM

ok ujst thought i would point it out. my way of thinking is that if you match the motor constant with the battery constant you will not have any problems

stampy · 12.29.2005, 12:26 AM

any body run a mtroniks pro controller? how do you like it? i was thinking of getting one but the only place i can think of is starluckrc.com but hes gone till like the 9th on jan :(. what about the newer mgm controllers are they good? did they fix the problem with braking when you let off the trottle?

MetalMan · 12.29.2005, 12:52 AM

I run a Mtroniks Truck controller, and it is pretty awesome. My favorite thing about it is that it's WATERPROOF. The external soldering bars (or whatever you call them) are also pretty nice.

I also run a MGM Compro 12012 new version, and I like it much better than the old version. The main difference between the new/old is that the new one has the "freewheel" option that corrects the problem where the controller changes the motor RPM to match the throttle input. It also has an adjustable drag-brake setting. The newer ones also have reverse disable.
The programmability of the MGM controllers is better compared to the Mtroniks. There are more options for acceleration speed, braking strength, Lipo cutoff type, etc. BUT, the MGM ones (at least not the plane style) aren't waterproof. IMO, that is the biggest drawback to them.