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Old 05-14-2015, 09:26 AM   #1 (permalink)
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Hi, I have some questions about the PL8 v1 unit.

1- I want to know if there is some other method to connecto to the PC than the FUIM3 dongle. I am a bit upset that with a charger at this price tag I have to spend additional $$ to get to the preset function, upgrades, hi voltage lithium batteries, etc...

2- Is there any preset for lipo that can charge to a certain voltage value, without the gradual current decrease by overshooting the set value. Respecting the safety values of course.

Eg: charging an empty LiPo for storage has a set value of 3.86v, once the charger reads this value starts a gradual current decrease. This final phase takes at least the same amount of time as the full throttle charge, so I tend to charge my 6s Lipo with the normal preset and when it reaches 4v/cell I just stop it, giving me a final value around 3.85v or 50% charge. That method saves me some 20 unecessary charging minutes.

3- Is it normal for precise charging to overshoot the 4.200v during the final charging phase? I have seen values as high as 4.218v on each cell. In the end it tends to stay around 4.205v however I didn't expect to see ony overshoot of the standard 4.2v. Is there some setting to prevent this?

Thanks
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Old 05-14-2015, 11:47 AM   #2 (permalink)
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Originally Posted by Mateyhv View Post
Hi, I have some questions about the PL8 v1 unit.

1- I want to know if there is some other method to connecto to the PC than the FUIM3 dongle. I am a bit upset that with a charger at this price tag I have to spend additional $$ to get to the preset function, upgrades, hi voltage lithium batteries, etc...

Many of the settings can be controlled via the console. But I can tell by the rest of your questions that you would really enjoy the power and flexibility that is unlocked with the CCS and usb interface. In the US its only $15 and the software is free. If you are still running the V1 software this also means you get a free power upgrade, 30 amps max to 40 amps max.


2- Is there any preset for lipo that can charge to a certain voltage value, without the gradual current decrease by overshooting the set value. Respecting the safety values of course.

Eg: charging an empty LiPo for storage has a set value of 3.86v, once the charger reads this value starts a gradual current decrease. This final phase takes at least the same amount of time as the full throttle charge, so I tend to charge my 6s Lipo with the normal preset and when it reaches 4v/cell I just stop it, giving me a final value around 3.85v or 50% charge. That method saves me some 20 unecessary charging minutes.

Yes, I do this as well to save time mostly during discharge to storage. What you are describing is the constant voltage stage. The slow taper so the end voltage matches the set voltage. For storage this precision is not necessary. For the discharge cycle, I'd switch the CV mode off, then lower the termination voltage. For example, I'll set termination voltage to 3.75v. The discharge mode runs at full output until the first cell reachs 3.75v. Once the discharge current is removed, the cells bounce back up to ~3.85v. The set voltage varies by pack and needs to be set lower for packs with higher IR values.

For the charge mode, you can do something similar. There are a lot of other tuning options for this. You leave in CV mode but raise the termination current. This will cause the cycle to end much sooner, but still allow for some absorption (old Pb charging term) of the charge current. Lots of options open up when you have the USB connection that cannot be set on the console.



3- Is it normal for precise charging to overshoot the 4.200v during the final charging phase? I have seen values as high as 4.218v on each cell. In the end it tends to stay around 4.205v however I didn't expect to see ony overshoot of the standard 4.2v. Is there some setting to prevent this?

Where are you seeing 4.218v? On the charger's console, a separate meter?


Thanks
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Old 05-14-2015, 12:33 PM   #3 (permalink)
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Greg, thank you very much for the prompt and lenghty response! I got things much clearer now.

1- I didn't know the max amps would increase, have always thought the V2 was a different hardware charger. Thanks for the tip!

2- Yes, thats exactly what I was looking for. Not as automated as expected but will work for me. The CV mode is accessed via the CCS, right?

3- I have seen the 4.218v in the volts/cell display in PL8 during the final current tapper. In the end the voltage tend to decrease to the targeted 4.2v I have not checked it with a multimeter.

P.D: FUIM3 on the way.
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Old 05-14-2015, 02:05 PM   #4 (permalink)
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Originally Posted by Mateyhv View Post
Greg, thank you very much for the prompt and lenghty response! I got things much clearer now.

1- I didn't know the max amps would increase, have always thought the V2 was a different hardware charger. Thanks for the tip!

2- Yes, thats exactly what I was looking for. Not as automated as expected but will work for me. The CV mode is accessed via the CCS, right? Correct

3- I have seen the 4.218v in the volts/cell display in PL8 during the final current tapper. In the end the voltage tend to decrease to the targeted 4.2v I have not checked it with a multimeter.
This can happen on small packs where the voltage can tend to jump around near the end of the charge cycle. What size pack was this on?

P.D: FUIM3 on the way.
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Old 05-14-2015, 02:47 PM   #5 (permalink)
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Packs are big: 3000mAh 30c and 2800 30C, all 6s. I pay close attention during the next charge this weekend. The packs are in good condition, IR arund 4-7.
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Old 06-05-2015, 03:25 AM   #6 (permalink)
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Hi Gergor, I have just updated the PL8 to v2, fw 3.32. You were right, the CCS unlocks a bunch of powerful options, I feel like having 50% PL8 charger until now...

Now charging stays at 0,005v above termination voltage during the final tapper. Thats perfect!

The only problem is that I was unable to set the termination tapper to 'none' for lipos, if I select C/3 ist ok but for 'none' there is an error message so I can't choose that option... Any ideas?

Thanks
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Old 06-05-2015, 11:51 AM   #7 (permalink)
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The only problem is that I was unable to set the termination tapper to 'none' for lipos, if I select C/3 ist ok but for 'none' there is an error message so I can't choose that option... Any ideas?

Thanks
I would try setting the termination mode to "Reaches Charge Voltage". This will end the charge cycle as soon as the set voltage is hit. As you know, the voltage sag after the cycle ends. It will sag more for packs with higher IR, or the higher the charge current. It may take some experimentation to find the right set voltage. But remember that will only apply to packs with similar IR charged a the same rate.
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Old 06-08-2015, 03:33 PM   #8 (permalink)
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Hi Greg, thank you. I tried the "Reaches Charge Voltage" option but for some reason it reached the set voltage in about 12 minutes and stood there for another 35 minutes for no obvious reason, charging in small increments. This was done with a good status 3000mAh 40C lipo with about ten flights. The C/3 charge finished faster
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Old 06-08-2015, 05:31 PM   #9 (permalink)
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Thanks for the report. It should terminate when or reaches the set voltage. Not sure why its not. The other option is to use a manual current setting for the termination. That could be set higher than C/3.
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Old 03-21-2017, 06:29 AM   #10 (permalink)
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Thank you Greg for the great support. This is an old thread but my questions are in the same line, so here they are:

1- Is that you cannot select 'None' for termination when charging Lipos a feature? II can do that manually just stoping the charge so why can't be done via software? Not discussing here the point of doing it or the consecuences.

2- Is there any way to disable the dialog box for saving the graph for every cycle (charge/discharge/storage/monitoring).. Becomes quite annoying after a couple of batteries... after a dozen it drives me

3- Can I get rid of the 30 seconds waiting time before the charge begins? After many many batteries those 30 seconds transforms in a lot of waste time.

Thanks in advance
Matey
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Old 04-03-2017, 11:01 AM   #11 (permalink)
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Anyone knows the answer??
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