[NSRCA-discussion] Landmark for e-pattern: >1C charging
Adam Glatt
adam.g at sasktel.net
Wed Mar 15 10:21:19 AKST 2006
There hasn't been any new data on cycle life's relation to depth of
discharge for months now. I heard 80% discharge depth for maximum pack
cycle life, and I used it last year and plan on using it again this year.
-Adam
Nat Penton wrote:
> On practice flights I normally use about 70% capacity. Did Charlie Wang
> indicate anything about this aspect ?
> Nat
> ----- Original Message -----
> From: "Steven Maxwell" <patternrules at earthlink.net>
> To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
> Sent: Wednesday, March 15, 2006 8:59 AM
> Subject: Re: [NSRCA-discussion] Landmark for e-pattern: >1C charging
>
>
>
>> I did find this posted by Charlie Wang on rcgroups, there doesn't seem to
>> be much difference in time for full charge and fast charge at 3C. this was
>> posted 3 days ago.
>>
>> I have just finished studying the effect of 3C charging with Thunder Power
>> ProLite batteery packs.
>> Equipment used are TP1010C charger with any of the TP balancer
>> 1)Charger set to full charge:Charge time is 26 minutes(charge to
>> 97%/4.175V)
>> 2)Charger set to fast charge:Charge time is 23 minutes (Charge to
>> 95%/4.16V)
>> Charging at 3C with TP1010/balancer for Power ProLites batteries will give
>> you the same cycle life as charging at 1C.
>> This is after a 4 months test with thousands of charge cycles.
>>
>> I think 23 minutes to 26 minutes charging will become the standard of
>> 2006/2007.
>>
>> Regards,
>> Chalie
>>
>> Steven Maxwell
>>
>>
>>
>>
>>
>>> [Original Message]
>>> From: Cameron Smith <dentdoc007 at adelphia.net>
>>> To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
>>> Date: 3/15/2006 8:55:47 AM
>>> Subject: Re: [NSRCA-discussion] Landmark for e-pattern: >1C charging
>>>
>>> Adam,
>>> By all means I will quadruple check with the guys.
>>> So far results have been good.
>>>
>>> Good example of doing your homework before you get into 2C 3C or more
>>> rate charging! But it's coming.
>>>
>>> Remember most manufactures DO NOT recommend this yet!
>>> TPs leader is Beta testing. Others are field testing.
>>> Solid charging practices should be followed.
>>> IF IN DOUBT -DON'T!
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: nsrca-discussion-bounces at lists.nsrca.org
>>> [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Adam
>>> Glatt
>>> Sent: Wednesday, March 15, 2006 8:11 AM
>>> To: patternrules at earthlink.net; NSRCA Mailing List
>>> Subject: Re: [NSRCA-discussion] Landmark for e-pattern: >1C charging
>>>
>>> Chad and I tried the 1010's 'Fast Charge' setting on one of the initial
>>> V1.85 version chargers last month. We found the end voltage to be
>>> inconsistent because the balancer didn't have enough time over 4.1v/cell
>>>
>>> to balance the pack, so the charger would get the pack to like
>>> 4.18v/cell, quit, and then the balancer would drop voltage by an amount
>>> determined by the condition of the pack - this is bad if you want to
>>> series discharge and series charge (though series charging is limited to
>>>
>>> about 0.95C).
>>>
>>> You guys should try the Fast Charge setting and watch the cell and pack
>>> voltages compared to 100% charge setting. Maybe it was just the 1.85V
>>> firmware, or the packs.
>>>
>>> -Adam
>>>
>>> Steven Maxwell wrote:
>>>
>>>> If your using the 1010 charger and the 95% charge means your doing a
>>>>
>>> full
>>>
>>>> charge if you change to the fast charge which is 97% your charging
>>>>
>>> time
>>>
>>>> should decrease alot, the fast charge takes out the final steps of
>>>>
>>> charge,
>>>
>>>> you might ask on RCGroups either everydayflyer or Charlie Wang will
>>>>
>>> answer.
>>>
>>>> Maybe Adam will answer here.
>>>> Steve Maxwell
>>>>
>>>>
>>>>
>>>>
>>>>> [Original Message]
>>>>> From: Cameron Smith <dentdoc007 at adelphia.net>
>>>>> To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
>>>>> Date: 3/15/2006 7:43:23 AM
>>>>> Subject: Re: [NSRCA-discussion] Landmark for e-pattern: >1C charging
>>>>>
>>>>> I have been using that charging combo.
>>>>>
>>>>> Charging 4 new TP 2100mah Prolites @ 1.5C to 95% capacity in about
>>>>>
>>> 35
>>>
>>>>> Minutes. (On 2 charger combos)
>>>>> This yields easy 10 minute flight on a 300+ watt system per battery,
>>>>> using around 1600-1700 mah.
>>>>>
>>>>> After following Charlie's advice I tried 2C but only gained less than
>>>>>
>>> 4
>>>
>>>>> minutes in charge time so I backed it down. I pay for my packs so I
>>>>>
>>> want
>>>
>>>>> to see others do 3C for a longer period of time before I "Crank it
>>>>>
>>> up"
>>>
>>>>> After doing this the old 1C rate/single charger for a couple years
>>>>>
>>> now,
>>>
>>>>> 4 times as much in 1/2 the time is Cool!
>>>>>
>>>>> I agree with Adam, This is good news for electrics.
>>>>>
>>>>>
>>>>>
>>>>> -----Original Message-----
>>>>> From: nsrca-discussion-bounces at lists.nsrca.org
>>>>> [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Adam
>>>>> Glatt
>>>>> Sent: Tuesday, March 14, 2006 11:16 PM
>>>>> To: NSRCA Mailing List
>>>>> Subject: [NSRCA-discussion] Landmark for e-pattern: >1C charging
>>>>>
>>>>> http://www.rcgroups.com/forums/showpost.php?p=5182816&postcount=24
>>>>> That post is by Charlie Wang, head of Thunder Power. Charlie has
>>>>>
>>> been
>>>
>>>>> running cycle test experiments where he cycles Thunder Power Pro Lite
>>>>>
>>>>> batteries with 2C and 3C charge rates, and 4C discharge rates. His
>>>>> experiments have convinced him that 3C charging of Thunder Power Pro
>>>>> Lite batteries does not harm the batteries.
>>>>>
>>>>> This is a major step for electric R/C. Consider a situation with one
>>>>>
>>>>> charger, two batteries, and 10 minute flights - low cost, typical
>>>>> pattern and sport equipment. Charge times are inside of 30 minutes.
>>>>>
>>>>> Allowing 5 minutes for pack cool-down, it is possible to log 5
>>>>>
>>> flights
>>>
>>>>> in less than 2 hours. In a pattern situation this isn't yet
>>>>>
>>> possible,
>>>
>>>>> because it takes a 16A charger to charge the 5.3Ah pack at 3C and
>>>>>
>>> they
>>>
>>>>> don't exist. Using available chargers, two TP 1010's ($320-$400),
>>>>>
>>> two
>>>
>>>>> TP 210 balancers ($140-$200), and four 5s4p5300 packs ($1100-$1300),
>>>>>
>>> the
>>>
>>>>> time for 5 flights would be something like 130minutes.
>>>>>
>>>>> 3C charging (currently 2C with pattern packs and available chargers)
>>>>> allows you to fly just as much with fewer batteries. That saves
>>>>>
>>> outlay
>>>
>>>>> costs, if not cost per flight, and certainly reduces the length of
>>>>>
>>> time
>>>
>>>>> you are stuck with current technology.
>>>>>
>>>>> More good news from the electric world.
>>>>>
>>>>> Those of you planning on charging at >1C, make sure you read
>>>>>
>>> Charlie's
>>>
>>>>> post. He gives specific guidelines and practices.
>>>>>
>>>>> -Adam
>>>>> _______________________________________________
>>>>> NSRCA-discussion mailing list
>>>>> NSRCA-discussion at lists.nsrca.org
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>>>>>
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>>>>>
>>>>>
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