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HelicopterMain Discussion › How is parallel charging Safe?
08-31-2012 01:46 AM  5 years agoPost 21
heli-cuzz

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Pittston, Pa. USA

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How many people own a pl8?
I own the PL8. I love the PL8. I wouldn't want anything other than the PL8.
Very easy to use. I can charge 6 batts parallel in 30 minutes easy.

Fury 55 NIB Furion6 CGY750 fbl helicopter-Frenzy CGY750 fbl nitro-Frenzy fbl NOBAR90

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08-31-2012 01:46 AM  5 years agoPost 22
MichiganFlyer

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Lansing,MI

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Lipos don't explode, people explode lipos. Better chargers do there job. Chafed wire checking is our job.

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08-31-2012 01:47 AM  5 years agoPost 23
heli-cuzz

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Pittston, Pa. USA

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Revolectrix claims the PL8 will not start a fire.

Fury 55 NIB Furion6 CGY750 fbl helicopter-Frenzy CGY750 fbl nitro-Frenzy fbl NOBAR90

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08-31-2012 02:22 AM  5 years agoPost 24
rcflyerheli

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Granbury, TX USA

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Lipos don't explode, people explode lipos. Better chargers do there job. Chafed wire checking is our job.
It may not start a fire but it will sure as hell spark if you hook the main power wires backwards (ask me how I know). The quote is absolutely accurate. No charger can protect against stupidity. With the energy that is available in today's lipos, one can't take anything for granted, as I did. I had not ever plugged the charging adapter backwards on my bullet plugs, until I did. I learned my lesson from that one, I can tell you that.

However, the folks at FMA are great - replaced my PL8 under warranty - no charge (money -).

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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08-31-2012 02:47 AM  5 years agoPost 25
FireNWater

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Collierville, TN

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.
My sarcasm was directed at the guys in the RC hobby who always feel the need to second guess the manufacturers and designers of the equipment, even though they have absolutely NO qualification or credibility other than being able to sound authoritative when posting on the internet.
.
I remember reading (and laughing) at one article when 2.4Ghz first came out. A guy wasn't convinced that the manufacturer knew enough about the range of 2.4G signals, so he strapped a receiver to the landing gear of his Cessna, mounted a servo in the cockpit while his buddy wiggled the sticks as he flew patterns at the local airport. AMAZINGLY, it worked just fine. I'm sure Futaba did that "test" years before committing millions of dollars to mass production.
.
Just my 2.4 cents . .

Buy Cheap, Buy Twice . . .

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08-31-2012 03:12 AM  5 years agoPost 26
McKrackin

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Lucasville,Ohio

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I only parallel charge my little pile of 2S packs.

After about 5 parallel charges,I balance charge them in series a 6S packs to balance every cell.

Don't trust the parallel thing to keep all the cells even.

I literally never use the word literally right.

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08-31-2012 03:28 AM  5 years agoPost 27
3dgimble

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Rochester

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so he strapped a receiver to the landing gear of his Cessna,
Lol, yeah that's about right. How else could you be sure.

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08-31-2012 03:55 AM  5 years agoPost 28
rpat

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Weirton, W. Va.

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Funny...if I plug in a pack backwards on my Hyperion Duo it just sits there and looks dumber than me staring at. It has reverse polarity protction built into it.

trex 700fbl cal30,minititan,, trx600fbl,trex250,logo 500,Velocity N2

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08-31-2012 03:39 PM  5 years agoPost 29
rcflyerheli

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Granbury, TX USA

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The problem was that I already had two other packs hooked to the parallel board when I tried to plug in no. 3, is when things lit up.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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08-31-2012 07:27 PM  5 years agoPost 30
rpat

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Weirton, W. Va.

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aaahhhh....I see.

trex 700fbl cal30,minititan,, trx600fbl,trex250,logo 500,Velocity N2

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09-01-2012 02:06 PM  5 years agoPost 31
Thatlumox

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NY

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Don't trust the parallel thing to keep all the cells even.
+1

After I parallel charge I check, or balance if need be, each pack individually. Just want to make sure a healthy pack isn't masking any issues with a failing pack.

"I'm a dirt torpedo!"

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09-01-2012 03:45 PM  5 years agoPost 32
3dgimble

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Rochester

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We know some positives of parallel charging, but what are some of the negatives for parallel charging?

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09-03-2012 12:27 AM  5 years agoPost 33
davehour

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Guayama, Puerto Rico 00785

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Parallel charging requires a good wealth of knowledge and understanding of the process. The prospect must know well the techniques of charge and discharge Lipos.

I wouldn't connect any pack if voltages between cells is over 0.030V. In that case, I will charge or discharge the packs to have them within this range.

You have to be EXTREMENLY CAREFUL WHEN CONNECTING/DISCONNECTING THE MAIN AND BALANCE CONNECTORS. If not, things can become real bad.

Disadvantages of parallel charging:

1. Involves more complexity and knowledge
2. The order of connecting/disconnecting the batteries is critical. Any connection made wrong means a short, lead/connector damage or even fire.
4. Requires powerful charger and power supply to supply the appropriate charging current.
5. Requires parallel charge and balance adapters.
6. The balance tracking must be kept under close supervision to pinpoint bad cells in the packs.

Today, I had a situation happened that could have ended bad. When I was parallel connecting the balance connectors of the batteries, after having the main connectors already parallel connected, I inadvertently was trying to connect one of the balance connectors backward and in a blimp a "shhhhhhhhhhhh" noise was hear. Yes, two pins of the balance connectors make contact with the other connector producing a short which practically disintegrated the two pins. Although this shouldn't happen, I mean, polarized connectors shouldn't allow backward connections, it did let the two pins do. The real reason this happened was my poor vision. I'm more than sure that if I had my glasses on, it never had happened.

I'll end saying parallel connections has worked perfect for me in all respects.

David

Hope this helps.

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09-03-2012 12:39 AM  5 years agoPost 34
Gregor99

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Western Wa

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This unit helps increase the safety of parallel charging.

http://www.usastore.revolectrix.com.../MPA_2/MPA-XH_2

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09-03-2012 12:43 AM  5 years agoPost 35
Gregor99

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Western Wa

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We know some positives of parallel charging, but what are some of the negatives for parallel charging?
1) If you have wire on pack break under the insulation, you will not know it.
2) If you have a cell going bad, it is hard to tell when connected to other packs in parallel.
3) The speed is of equalization between cells is far slower than most poeple are aware of. Depending on the packs, cells may not equalize for 10 to 20 minutes after the charge has completed.

Using quality cell checker on each pack before and after the charge will make the operator aware of all of these conditions.

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09-03-2012 12:58 AM  5 years agoPost 36
TheWoodCrafter

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Costa Mesa, Ca.

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The speed is of equalization between cells is far slower than most poeple are aware of. Depending on the packs, cells may not equalize for 10 to 20 minutes after the charge has completed.
How do you know this?

Have you measured this yourself?

Thanks, TheWoodCrafter

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09-03-2012 01:02 AM  5 years agoPost 37
Gregor99

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Western Wa

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How do you know this?
Have you measured this yourself?
Yes. I did the test some time ago. Others have done similar tests and reported similar findings. It may not be an issue for every combination of packs. But I have several sets which I can repro this with. Also note that starting voltage is not a factor. I left the packs conencted in parallel for a hour. I verified all cells in parallel had equalized before starting the charge. Again, not everyone is going to see this. That's the reason to check the packs right after the charge finishes. Even then, many will find the resulting imbalance within thier accepted norms. But note that every one has a slightly different definition of acceptable norms.

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09-03-2012 01:21 AM  5 years agoPost 38
TheWoodCrafter

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Costa Mesa, Ca.

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So Greg, you are saying that when parallel balance charging and the charge is complete (all cells balance) the packs/cells are not the same.
And the only way they will be/stay the same is if you leave the packs plugged into the parallel board for as long as 20 minutes?
And if you unplug from the board right away the cells/packs may not be balanced.

Did I understand you right?

Thanks, TheWoodCrafter

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09-03-2012 01:39 AM  5 years agoPost 39
Gregor99

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Western Wa

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So Greg, you are saying that when parallel balance charging and the charge is complete (all cells balance) the packs/cells are not the same. And the only way they will be/stay the same is if you leave the packs plugged into the parallel board for as long as 20 minutes?
And if you unplug from the board right away the cells/packs may not be balanced.
Did I understand you right?
Not with every combination of packs, but yes it does happen with some combinations.

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09-03-2012 09:44 AM  5 years agoPost 40
shawmcky

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Isle of Wight,United Kingdom

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Concentration and a good pair of glasses are essential when parallel charging batteries

Team- unbiased opinion.K.I.S.S principle upheld here

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HelicopterMain Discussion › How is parallel charging Safe?
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