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-   -   Discharge Rate (http://www.Wattflyer.com/forums/showthread.php?t=73932)

garyp1029 06-20-2014 09:06 PM

Discharge Rate
 
I have a ICharger 106b which has both a discharge and a storage function. Is it safe to discharge at the same rate--3.3A?--that I use to charge my 3s 3300 mah batteries? Or should the discharge rate be less than 3.3? I am aiming for a final storage voltage of 3.8. Thanks. Gary

fhhuber 06-20-2014 09:10 PM

You can always discharge a pack faster then you can charge.

Within the limits of the charger... you could discharge at C rating * capacity

dereckbc 06-21-2014 12:10 AM

Discharge as high as you want. I have the 1010B+ and not sure about the 106, but my 1010B on a 3S pack will not do more than 2 amps on Discharge.

garyp1029 06-21-2014 02:31 AM

Interesting. I tried to discharge my 3s 3300 at 3A, and the discharge rate on my 106b automatically and instantly dropped to 1.2A. This happened on both the "discharge" and the "storage" functions. I guess 1.2A is the max.

dereckbc 06-21-2014 03:37 AM

Yeah with Ichaarger the amount of power they can burn off is fairly small. On my 1010B 20 watts is about all I get in a 3S pack which is roughly 1.7 to 1.8 amps maximum. Not sure what the 106 limit is but it sounds like around 10 to 15 watts.

On the 1010 you can increase it by using an external power resistor to get up to 7 amps max. For me that is a 1.5 Ohm 75 watt resistor. Down side is it only works in one discharge mode called Dich+. Won't work on storage.

JetPlaneFlyer 06-21-2014 08:28 AM

Quote:

Originally Posted by garyp1029 (Post 951041)
Interesting. I tried to discharge my 3s 3300 at 3A, and the discharge rate on my 106b automatically and instantly dropped to 1.2A. This happened on both the "discharge" and the "storage" functions. I guess 1.2A is the max.

As noted above, discharge is limited by both amp limit and power limit. For anything other than single or two cell batteries it's usually the discharge power limit that is the deciding factor. The 106b has a 20W power limit which should allow a 3s battery to discharge at around 1.6A. The discharge power is adjustable in the software so you might want to check that it's set at the full 20W rating.

If faster discharging is something that you want from your charger you need to look for the discharge power rating in the spec. Generally though you need to get a high end charger to get decent discharge power rating.

fhhuber 06-21-2014 12:05 PM

And... usually the best (fastest and most fun) way to do a discharge is to fly the plane ;)
Then plug the battery in and select storage charge...

Or you can tie the tail of the plane to a fence post and run the motor. (not as much fun as flying... but faster than the discharge of most chargers)

ron_van_sommeren 06-21-2014 05:40 PM

Charge/discharge rates as a function of #cells
www.scriptasylum.com
-> RC calculationshttp://www.scriptasylum.com/images/rccalculations.jpg
-> electrical
-> Lithium battery chargers
and
-> Charger required power calculator

The other menu items and demos are also veeeeery handy/instructive for e-folk, add site to your favourites?


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