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03-31-2014, 04:11 PM | #1 (permalink) |
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Join Date: Jul 2012
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# 7 Storage charge issue?
Hey guys, when I try and storage charge 4P(4 x 3300mah 6S)my PL8 with MPA wont let me go past 2.5 amps for some reason? It will at 1, 2, or 3P. I don't get it. I am pretty sure it used to before the last update. Any idea what's going on? Thanks.
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03-31-2014, 04:59 PM | #2 (permalink) |
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The maximum charge rate for the default storage preset is 10 amps. To go higher than 10 amps, use the library preset #9 High Power Storage Charger. However, I usually don't charge UP to storage. In most cases its not required.
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03-31-2014, 08:46 PM | #3 (permalink) |
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Join Date: Jul 2012
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Thanks Gregor
Why don't you charge up to storage? I know it wont hurt the cells unless they sit for a long time and over discharge but, I can charge and be ready to go to the field in 12 minutes with them at 50% vs quite a bit longer if they are at 20-25%. Its nice being able to head out quicker |
03-31-2014, 09:50 PM | #4 (permalink) |
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In your scenario, charging up to storage is perfectly fine and appropriate. You could even bump the storage voltage up a little to further reduce the charge times at the field. Just stay below 3.9v.
In my case I would rather take the hit in charge time at the field. Its not worth it to me to run through an extra charge cycle to reduce the charge times. They are already fast enough. You can further reduce charge times with a higher charge rate or higher termination setting.
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03-31-2014, 10:37 PM | #5 (permalink) | |
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Re: # 7 Storage charge issue?
Quote:
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04-01-2014, 01:53 AM | #6 (permalink) |
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Join Date: Mar 2011
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Do it like Georg, as long as Cell V is around 3.8V i do not store charge my packs, except for winter when they go in storage for a couple of months.
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04-01-2014, 04:13 AM | #7 (permalink) |
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I don't think I've ever brought a pack down with 3.8V remaining! Unless it was a crash, or malfunction, or I freaked out because I realized I forgot to reset my timer.
I usually finish around 3.68V to 3.72V per cell. There's still room at those levels to not cause any damage and I'm able to squeeze out more flight time. The Kosmik logs pack voltage throughout every flight, so I can verify that I'm not dipping into the danger zone (below 3.3V/cell) under load. After researching and talking with Greg I no longer storage charge (up) my packs. I fly basically every day so they never sit long and they're always kept at room temperature so no risk of voltage drop. I've been testing four Revo packs under those conditions with meticulous data collection and am now at 72 cycles each with no signs of puffing, capacity loss, or increasing IR. To avoid the initial charge-time hit at the field I charge before I head out so I can fly as soon as I get there. Since I'm storing and charging them at room temperature and they sit in a temp controlled car (out of direct sunlight) for the trip, no risk of voltage increase due to ambient temp changes. Not prescriptive guidance, just relaying what I do and how it's working for me.
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04-01-2014, 11:16 AM | #8 (permalink) |
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I should have been more clear. Its not actually an extra charge cycle for the packs. Its an additional charge cycle for the user. This works better for me as it also allows the generator to cool before putting on the generator cover and packing it in the car.
When I arrive at the field and start the charge, the packs are usually done before I'm done setting up and saying hello to everyone. If I think I will be pressed for time, I'll charge at home right before heading out. But to be clear, there is nothing wrong with charging up to storage to save time on the next charge cycle. Totally up to you, both methods are valid.
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