segmentfault

I'm in the process of attempting to create a setup where there is no downtime between batteries and charging.

Currently I have a 50w max charger with three 4s 5000mah batteries. I am waiting around 40 minutes for the first battery to charge after I'm done with my second. This is because at 4s, you can only charge 3.3a max with a 50w charger. Since W = A * V, then W / V = A... therefore 50w / 14.8 = 3.378a max. This means each battery takes 60+ minutes.

I figured I can either purchase two more 4s 5000mah batteries and one more accucel-6 charger, and then have both chargers charging the batteries while I'm using the charged ones. This should allow me to constantly drive without downtime.

Alternatively, I could also purchase the iCharger106B - iCharger 106B-plus 250W 6s Balance/Charger which is 250w output, thus would charge at 4s @10a easily, and effectively charge a 5000mah 4s in about 20 minutes. This charger should enable me to drive constantly with no downtime with my three 4s 5000mah turnigy batteries.

I want to hear what other people have come up with for no-downtime running in the electric 1/8 world.

Let's discuss!

seg

The Fox

iTrader: (21)

I can run without downtime in 1/10th scale. I am using 3 batteries, 4100mAh smc packs and 2 chargers. I am using a Checkpoint TP1030, and its twin an Ice. I run stock buggy.

With 1/8th scale, not so much. They eat up a lot of power. If it takes 40 mins to charge at 1c(what you should charge at unless the manufacture says more). I would run 2 chargers, and if you average 8 mins run times, then 10 batteries would be good. Only thing is to keep the electronics at 150F or under with your gearing. Any hotter and you could start to prematurly damage your electronics by keeping them hot.

Nick

tom_chang79

iTrader: (13)

Your equation on the second part is ok, but how you got there (first equation) is wrong...

Power (in Watts) = V (in volts) * I (in ampere)

W DOES NOT equal Ampere over Volts...

Perhaps you made an error in your first divide by symbol "/" with the multiply (or dot product in this case) "*"



One more thing, once I have about three or more battery packs, I never have a "downtime" for batteries. However, do you not cool off your motor? My motor comes off pretty hot (not too hot that it burns ya), but I do take a desktop fan to the motor and ESC to allow it to cool down between runs...

???

Also, having two chargers helped ALOT.

My setup (although it's NiMH):

Pulsar 3
Pulsar 2

Four packs of 3300mAH to 3600mAH 6-cell packs (I have various cells).

I have no downtime, I usually have two packs waiting for me at all times...

Did I answer your question? I feel like I might've completely missed your question...

badassrevo

iTrader: (12)

I have two Hyperion Duo chargers and 4 sets of MaxAmps 6500 packs. I can run continously if need be with my 1/8th Caster Fusion.
I just took 3rd in a 2hr enduro race at www.medinarcraceway.com

Outtacontrol58

iTrader: (92)

Thats a heck of a setup you got there Revo, Wish i had the $$ LOL

segmentfault

I guess that's what I get for posting late at night.. hehe. Yes I meant W = V * A. I changed it in my original message now.

Outtacontrol58

iTrader: (92)

Seg, I havt the same charger pretty much in AC/DC, what happens if you set the charger for 5amps? Does it automatically charge at most 3.3 or do you have to set it up manually to 3.3A

abiye

according to the product picture for the accucell 6 it should be able to do 6S at 5 amps.... is it misleading?

segmentfault

It is misleading because the charger cannot exceed it's maximum 50 watt capacity.

6s is 22.2 volts. Since:

W = Amps * Volts
W = Amps * 22.2
W / 22.2 = Amps
50 / 22.2 = Amps
Amps = 2.2522 @ 22.2v

They probably meant 5a maximum, and 6s cell maximum.

The maximum voltage this charger can output using 5a is...

W = V * A
50 = V * 5
V = 50 / 5
V = 10

10 volts is the maximum voltage the charger can output a 5a charge. Anything over 10v, the charger scales back the amperage.

This is why I ordered the 250w charger listed above.

W = V * A
W = 22.2 * 10
W = 220

22.2v @ 10amps takes 220watts. As you can see, the 250w charger can charge a 6s without timing back its specified maximum current.

seg

UN4RACING

iTrader: (22)

I would like to hear about how you managed the race motor esc battery run time temps. I ran 55 minutes with an 8000 mah and a 17.5. One charge.

abiye

so what would happen if you hit start on the screen that is displayed in the product picture... does it give you an error for anything exceeding the 50W rating... can someone who has this charger check and let us know... please

segmentfault

I have the charger and set 5.0 at 4s all the time. It will just trim down to 3.3a - it will not give an error.

Outtacontrol58

iTrader: (92)

So how long would it take a 50w charger like the accucel to charge a 3000, 6s lipo on average? Thanks!!!

segmentfault

Lets say you charged when your cells dropped to 3.3v. That means you will have 19.8v left in your battery when starting the charge. 50w / 19.8v = 2.56a on start and it will trim down to 2.25a when you are done at 22.2v.

I'm willing to guess that it would take 55-65 minutes to charge a 3000mah 6s with that charger because of the low 2.56a to 2.25a charge.

However, since your batteries are 3000mah, that means your 1C charge rate is 3a which is almost what the charger can put out. If your batteries can charge at 2C (you must make sure with the manufacturer though before exceeding 1C,) then you could charge at 6a if you had a better charger.

UK.hardcore

I doubt your car will hold up over time if you drive 3 hours at once, only stopping for battery changes.