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› charging LiPos with the Schulze isl6-330d, what times are you getting ?
11-03-2004 11:33 PM  13 years agoPost 1
vipul

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New Jersey

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Hi Guys,

I just bought this Schulze charger and I have a Thunderpower 4s4p which I use for my logo 10. The question I have is that I charge it by setting the current to 1.5 amps and setting the cell count to 4 cells for the Lipo.

Now I originally thought that people were able to charge Lipos in about an hour, however it takes a little over 3 hours to completely charge this at 1.5amps.

Since this is my first Lipo pack and my first Lipo charger, is this a reasonable amount of time to charge the cells. I guess this 3 hour charge was with about a 15 minute run time on the cells so I guess they were over 50% used.

Any input here would be appreciated. Thanks.

Vipul

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11-03-2004 11:45 PM  13 years agoPost 2
Rob_T

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How did you decide on 1.5A as the charge current? It sounds low to me.

Most TP 4P packs are about 8000mah, so can be charged at upto 8A (that's the 1C rate for an 8000mah pack).

Whats the rated capacity of your pack? Please post that so we can advise on the proper charge current.

For a completely empty lipo, you should expect charge times to be about 80 to 90 minutes at the 1C rate.

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11-04-2004 04:35 AM  13 years agoPost 3
vipul

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New Jersey

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hi Rob,

the rated capacity is 8000mah, i thought i read somewhere that charging at 8amps was really bad for the battery. is that true ?

-Vipul

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11-04-2004 09:23 AM  13 years agoPost 4
poerQwa

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Rotterdam, The Netherlands

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If you can find a charger that will do 8 amps

As the going charge rate for Lipo's is 1C (1 * the capacity of the battery) this should be ok.

Due to the characteristics of your pack (4P4S) the pack behaves as if there are 4 cell with the capacity of 8000 (although the individual cells are 2000Mah). So 1 C means add up the capacity of all S cells (in your case 4).

Greetz,

Marc

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11-04-2004 06:35 PM  13 years agoPost 5
Rob_T

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Hi Vipul,

For your battery 8A is the maximum safe rate of charge, and it will take 80 to 90 minutes for your charger to completely charge it from empty. If you watch the charging display you'll see that the charger spends about 50 minutes charging at 8A and then gradually reduces the current as the battery gets close to full, that's why it takes more than an hour to complete the charge. (It actually takes about 35% of the charge time to put in the last 10% of charge.)

If you're not in a hurry, reducing the charge current to 4A might extend the life of the battery, and the charge time will be increased to about 2 1/2 hours from completely empty. There is very little improvement in battery life if you reduce the charge current below 4A (although if your charger is a Triton that can only manage 2.5A, that will work too, just it takes longer.)

poerQwa: Schulze and Astroflight both make chargers that can do 8A. The Astro 109 costs about half of what one 4S4P battery costs.

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11-04-2004 07:29 PM  13 years agoPost 6
airshares

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Thousand Oaks, CA

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Charging
If I have a Tanic 3 cell 830MAH what is the max charge rate i can do?
.8 amps? or 3 amps?
I am still trying to get this correct. Currently i just charge it at .8 amps.
I also have a TP 3 cell 2100mah. What would be the max charge rate on that one? 2.0 amps?

Thank You

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11-04-2004 10:00 PM  13 years agoPost 7
poerQwa

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Rotterdam, The Netherlands

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Airshares,

If the TP 3cell is a 3S1P setup the 1C rule applies, in this case max 2.1A

I don't know the Chargerate for the Tanic's but as they are lipo again the general rule of 1C applies. This case max .83A

Greetz,

Marc

Rob, thanks for the info.

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11-04-2004 10:07 PM  13 years agoPost 8
airshares

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Thousand Oaks, CA

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Charge Rates
Thanks Marc

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11-06-2004 08:14 AM  13 years agoPost 9
vipul

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New Jersey

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Thanks guys,

Unfortunately I only have a 5amp power supply so after 20 mins of charging at 4 amps, I get the not enough power available message from teh Schulze charger. Anyone know, where I could get like a 15 amp supply for around $40 or so ? I just would hate to spend another $100 to buy a 20 amp power supply.

Please let me know, thanks.

Vipul

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11-06-2004 08:46 AM  13 years agoPost 10
Rob_T

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Until you find the new power supply you can just drop the charging current and accept the longer time it will take to charge.

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