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Nov 03, 2013, 07:23 PM
Registered User
Go4it's Avatar
Question

LIPO discharger needed


I am of need of a lipoly discharger with auto cut-off at 3.8v per cell--'commercially' available

For 6S LIPO 5300mah
Last edited by Go4it; Nov 04, 2013 at 08:12 AM.
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Nov 03, 2013, 07:36 PM
Registered User
crashdaily's Avatar
Imax B6 - the discharge current 0.5A.
Nov 03, 2013, 10:36 PM
characters welcome!
Mark Wood's Avatar
Most smart chargers have a storage function. Consult the manual.

mw
Nov 04, 2013, 05:30 AM
222 km/hr Parkjet flyer
solentlife's Avatar
Commercially ? Not many and likely not budget priced !

Search forums like this and Wattflyer and you find threads of constructing dischargers like my Light-Bulb version.

To create an auto-cut-off DIY discharger is not impossible and odd threads have done them ... but in the end KISS rules and a simple stopwatch .. or even clockwork timer is useful !

I have looked at using the clockwork relay that is in my old NiCD car chargers ... it connects system and then cuts when it hits zero. The spring winds up for a max duration of 30mins.

Nigel
Last edited by solentlife; Nov 04, 2013 at 07:25 AM.
Nov 04, 2013, 06:09 AM
Registered User
A Cellpro Powerlab charger or WMR CBA would be your best options. You didn't specify how much discharge power you need.

http://fmadirect.com/

http://www.westmountainradio.com/cba.php
Nov 04, 2013, 08:14 AM
Registered User
Go4it's Avatar
Quote:
Originally Posted by crashdaily
Imax B6 - the discharge current 0.5A.
Thanks'
But, I need something in the range of 10 to 30 amps range for discharge so it would not take all day.
Nov 04, 2013, 08:50 AM
Registered User
Really your only option then is a West Mountain Radio CBA. Hopefully you have a fat wallet.

While a PowerLab 6 or 8 can do a 30 amp discharge it will be regenerative so you will have to put all that energy back into a very large deep cycle battery. I'm guessing that won't fit your needs.
Nov 04, 2013, 09:17 AM
Registered User
Quote:
Originally Posted by Go4it
Thanks'
But, I need something in the range of 10 to 30 amps range for discharge so it would not take all day.
What's your budget?
Nov 04, 2013, 10:18 AM
Space Coast USA
hoppy's Avatar
Quote:
Originally Posted by Go4it
I am of need of a lipoly discharger with auto cut-off at 3.8v per cell--'commercially' available

For 6S LIPO 5300mah
Do you usually end up with discharged packs and some fully charged packs? If so, a simple parallel connector and resistor between discharged and fully charged packs works nicely. Not commercial but very simple.
See this thread.
Nov 04, 2013, 10:43 AM
Space Coast USA
hoppy's Avatar
Or another simple (but semi commercial) method is to use 2, 100W 12V RV bulbs in series with a 15 min timer like this..

If my figures are correct that will discharge a 6S 6000mah pack in 18 min or one turn of the timer dial.

6000mah/2 = 3000mah to get rid of.
2, 120W bulbs in series at 24V = about a 10A draw.
3000mah/10000ma = 18 min.

So a 5300mah pack should be about 1 turn on the timer.

Somebody check those numbers...
Nov 04, 2013, 10:46 AM
Registered User
Go4it's Avatar
Quote:
Originally Posted by Ohmic
A Cellpro Powerlab charger or WMR CBA would be your best options. You didn't specify how much discharge power you need.

http://fmadirect.com/

http://www.westmountainradio.com/cba.php


I have a CBA but it is made for smaller lipo's in fact if anyone wants it I'll list it for sale?
Nov 04, 2013, 10:53 AM
Registered User
Go4it's Avatar
Quote:
Originally Posted by hoppy
Or another simple (but semi commercial) method is to use 2, 100W 12V RV bulbs in series with a 15 min timer like this..

If my figures are correct that will discharge a 6S 6000mah pack in 18 min or one turn of the timer dial.

6000mah/2 = 3000mah to get rid of.
2, 120W bulbs in series at 24V = about a 10A draw.
3000mah/10000ma = 18 min.

So a 5300mah pack should be about 1 turn on the timer.

Somebody check those numbers...

Looks good
I have been using a EDF test stand and running the EDF for a few minutes with a cell logger attacked and then disconnect at 3.8 or 3.7v. The reason I ask I am getting tried of the noise of the fan. But it is fast at 85amps discharge . I don;t like lipo's to set at full charge for more then a few days.
Nov 04, 2013, 10:59 AM
Registered User
Quote:
Originally Posted by Go4it
I have a CBA but it is made for smaller lipo's in fact if anyone wants it I'll list it for sale?
You much have some very large LiPos then if the 2,000W version is too small for you.

http://www.westmountainradio.com/pro...d=sys2000_watt
Nov 04, 2013, 11:09 AM
222 km/hr Parkjet flyer
solentlife's Avatar
Quote:
Originally Posted by Go4it
Looks good
I have been using a EDF test stand and running the EDF for a few minutes with a cell logger attacked and then disconnect at 3.8 or 3.7v. The reason I ask I am getting tried of the noise of the fan. But it is fast at 85amps discharge . I don;t like lipo's to set at full charge for more then a few days.
It is true that leaving LiPo standing at more than storage is bad for them ... but also repeated 85A discharges when not necessary are not so good either !!

Do you not consider it would be a nice holiday for your LiPo's to be discharged at a less stressful rate ?

The timer ... I never thought to use a Domestic Wall timer .... One like that fitted into my system would be excellent !! Thanks Hoppy

Ebay here I come .... !!

Nigel
Nov 04, 2013, 01:09 PM
Registered User
Quote:
Originally Posted by hoppy
Or another simple (but semi commercial) method is to use 2, 100W 12V RV bulbs in series with a 15 min timer like this..

If my figures are correct that will discharge a 6S 6000mah pack in 18 min or one turn of the timer dial.

6000mah/2 = 3000mah to get rid of.
2, 120W bulbs in series at 24V = about a 10A draw.
3000mah/10000ma = 18 min.

So a 5300mah pack should be about 1 turn on the timer.

Somebody check those numbers...
Those timers are designed to switch AC, not DC.


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