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Old 09-30-2016, 12:09 PM   #1
pilotError
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Default 2 PL8's vs PL8 x2 for a generator field setup

I'm setting up a new charge case for generator use (funfly's).

Right now I charge at home (Iota dls-27-40) with a single PL8 using an MPA.

I picked up an EU2000i, but have been kicking around what to do for the charge case.

I guess the choices are buy a PL8 x2, or just pick a second PL8 up.

Any advantages of one over the other?

Also I currently have a 24v HP 1200 setup (by DSW) that I was going to throw in the case. If I end up going with the x2, is it worth it to go to 36v?
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Old 09-30-2016, 12:22 PM   #2
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The dual powerlab was easier for me to mount (and cheaper for me to buy).

They're powered as individual units anyway, and I feed them both 48volts from four 12V HP 1200 PSUs.

Because there's nothing I can do to limit the current draw, it's possible to inadvertently pull more than 2000W and trip the generator. What happens is that the entire case will suddenly shut off, and the generator will go to idle. Just beware that the 2xPL8 and the DPL8 really are monster chargers and it's totally possible to trip house breakers and your generator.
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Old 09-30-2016, 12:29 PM   #3
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Quote:
Originally Posted by Fauropitotto View Post
The dual powerlab was easier for me to mount (and cheaper for me to buy).

They're powered as individual units anyway, and I feed them both 48volts from four 12V HP 1200 PSUs.

Because there's nothing I can do to limit the current draw, it's possible to inadvertently pull more than 2000W and trip the generator. What happens is that the entire case will suddenly shut off, and the generator will go to idle. Just beware that the 2xPL8 and the DPL8 really are monster chargers and it's totally possible to trip house breakers and your generator.
I always wondered what's the benefit of going over 24v? Are you lowering the amp draw on the generator by going 48v on the psu side? Those hp psu's are so tiny I would have no problem adding a third or 4th to my setup if it's a major benefit.
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Old 09-30-2016, 01:20 PM   #4
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Quote:
Originally Posted by pilotError View Post
I'm setting up a new charge case for generator use (funfly's).

Right now I charge at home (Iota dls-27-40) with a single PL8 using an MPA.

I picked up an EU2000i, but have been kicking around what to do for the charge case.

I guess the choices are buy a PL8 x2, or just pick a second PL8 up.

Any advantages of one over the other?

Also I currently have a 24v HP 1200 setup (by DSW) that I was going to throw in the case. If I end up going with the x2, is it worth it to go to 36v?
Really the only advantage I've found was size. The DPL8 is the same size as 2 PL6's. Where as the PL8's are taller and harder to cram in a case. Hence PL8's are out of the equation for me as I redesign my case. If you got the room I don't see any reason not to go with a second PL8.
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Old 09-30-2016, 01:47 PM   #5
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Originally Posted by oliver1071 View Post
I always wondered what's the benefit of going over 24v? Are you lowering the amp draw on the generator by going 48v on the psu side? Those hp psu's are so tiny I would have no problem adding a third or 4th to my setup if it's a major benefit.
Efficiency and avoiding the buck-boost problem of 24V while charging 6S and 7S cells. The PLs handle this well, but it's more efficient to avoid that region altogether and just have it downregulate the voltage throughout the cycle.

When I max out a channel at 40 Amps charging some 6S packs, that's some 1008W that it needs to output. Assuming a 90% efficiency of the charger, that's some 1120W that the charger needs to be fed. At 48V that's 23A spread out over 4 PSUs so each PSU needs to output 5.7A at 12V....but at 24V that's 46A spread out over 2 PSUs, so each PSU needs to output 23A at 12V.

Of course, real world behavior is more complicated, but by and large, the higher the voltage, the gentler it seems to be on your systems.

This works well on these massive power systems for these big charging needs.
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Old 09-30-2016, 01:57 PM   #6
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Quote:
Originally Posted by Fauropitotto View Post
Efficiency and avoiding the buck-boost problem of 24V while charging 6S and 7S cells. The PLs handle this well, but it's more efficient to avoid that region altogether and just have it downregulate the voltage throughout the cycle.

When I max out a channel at 40 Amps charging some 6S packs, that's some 1008W that it needs to output. Assuming a 90% efficiency of the charger, that's some 1120W that the charger needs to be fed. At 48V that's 23A spread out over 4 PSUs so each PSU needs to output 5.7A at 12V....but at 24V that's 46A spread out over 2 PSUs, so each PSU needs to output 23A at 12V.

Of course, real world behavior is more complicated, but by and large, the higher the voltage, the gentler it seems to be on your systems.

This works well on these massive power systems for these big charging needs.
Cool thanks for the info I'll have to decide if convenience is better than efficiency I've actually ditched the whole charging case since my 308duo fits in the pocket of my heli bag. I just bring my psu if I need it. It's just simple and small. At my local field I just made a second one and leave it in the locker for everyone to use. 48v probably isn't a good idea there a lot of people have 12v chargers so they'd probably be blowing up their chargers by mistake.


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Old 10-01-2016, 02:03 AM   #7
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I like the handle 👍
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Old 10-01-2016, 10:50 PM   #8
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If you go with a pair of PL8s you pretty much have decided on a 24V system. Max input voltage for a PL8 is 32 volts. I run a pair of PL8s in my setup and they can give my genie a bit of a workout in Eco mode at buc/boost if I have both chargers going with a pretty good load. At around 10 amps in Eco mode the genie doesn't care at buc/boost interface.
A pair of modded HP DPS1200s can be a whole lot cheaper than a 48V Meanwell and a lot less cumbersome than four server PSUs in series. Really boils down to what you want to spend, what case you want to put the system in.
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Old 10-01-2016, 11:30 PM   #9
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I had two PL8's since they first came out and replaced them with a DPL8x2 when it first came out. I'm using a 1500W 48V power supply. As mentioned, the DPL8x2 is physically smaller than two PL8's. The higher input voltage means less current running through the charger.

In the PowerLab settings you can limit the max current draw to prevent the charger from overloading your power source.
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Old 03-12-2017, 06:11 AM   #10
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My genie eu20i also throttled up rapidly at this stage. I like to run him in eco, but I wonder if me genie likes 2 or 3 minutes of buck boosting.

I counted today I stopped at around 80 pulses and the it continues for another minute.

It's a Honda it should be quality but is it OK to run him in eco?

Ps: had my first field day today after winter (last usage roughly September) it was in the garden shed the whole winter, with old gasoline in it it started on 8th pull
Not bad, I reckon, once on the field again on first pull.
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Old 03-12-2017, 09:45 AM   #11
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I run mine in Eco mode all the time. I also use STA-BIL Marine formula all the time.
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Old 03-17-2017, 07:25 AM   #12
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I run my in Eco as well, it feed my 2000w-48v meanwell that feed my DPL8 and bump controller.

My first limiting factor is the generator (Honda 2000i) I would need a second one to remove this limitation.

My second limiting factor is my power supply not big enough for the DPL8 if I used both side at max at the same time.....I would also need a second meanwell.....just too heavy for my taste.

What I have is already pretty powerful and I'm OK with the limitations.
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Old 03-17-2017, 11:10 AM   #13
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I run mine on Eco too. I had the buck-boost problem when I was running 2xPL8s too. It was annoying but nothing more. My new setup is the same as Daniels, DPL8, Meanwell 2000-48 and Honda 2EU (Our version of the 2000). Plenty of charging power for my needs, and I never really come close to maxing it out. I pull the most power when I am charging 2x7S-5300 on one side and 2x6S-5000 on the other side at 2C, and everything hums along very nicely
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Old 03-18-2017, 02:41 AM   #14
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can someone explain the buck boost issue and what does it really mean and what do you see/notice due to that?
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Old 03-18-2017, 06:35 AM   #15
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Quote:
Originally Posted by larryfl View Post
can someone explain the buck boost issue and what does it really mean and what do you see/notice due to that?
Buck/Boost happens on all chargers, it's not specific to the PowerLabs.

https://www.helifreak.com/showpost.p...9&postcount=21

Last edited by Ace Dude; 03-18-2017 at 07:32 AM..
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Old 03-18-2017, 06:36 AM   #16
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Sorry, dupe. Disregard.
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Old 03-18-2017, 07:17 AM   #17
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can someone explain the buck boost issue and what does it really mean and what do you see/notice due to that?
Don't know of any issues......what is that suppose to be?

Been using my PL8 for 5 years, and my DPL8 since they are out...
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Old 03-18-2017, 07:27 AM   #18
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Quote:
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Don't know of any issues......what is that suppose to be?

Been using my PL8 for 5 years, and my DPL8 since they are out...
It would not apply to you.

https://www.helifreak.com/showpost.p...2&postcount=15
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Old 03-18-2017, 07:58 AM   #19
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Quote:
Originally Posted by Ace Dude View Post
Buck/Boost happens on all chargers, it's not specific to the PowerLabs.

https://www.helifreak.com/showpost.p...9&postcount=21
i currently have a mean well 1000 24v and about to purchase a new mean well 2000 that will give me about 1500 usable...

so the question is 24 v or 48v ?

i have a dual pl8 so 48v is fine..the issue is my case fans and usb charger are 24..i can probably get a 48v fan..not sure about the usb charger...

thoughts and recommendations?

does 48v make much of a difference and worth it to overcome the buck/boost?
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Old 03-18-2017, 07:59 AM   #20
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I have a 48v to 12v converter....for my fans and USB plugs....
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