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May 09, 2012, 10:20 PM
Revolectrix Ambassador
Quote:
Originally Posted by mrforsyth
Agreed that the PL6 will have lower total charge times, but not by ~33% when charging 6S lipoly from a 24 volt source.
As discussed in more detail in the test, this was done to show the maximum power output of Powerlab6 on a 24v vs other chargers such as the 306b which have a 30 amp limit. This chart was intended to compare the wattage and charge times for the bulk charging phase, where maximum power is important.

I deliberately left off the balancing and constant voltage stage. This was done because every charger has slightly different balancing current as well as balancing behavior. Also different chargers have different current cutoffs for the CV stages as well as tolerances for current values. As the test was only intended to show the maximum wattage, including the balancing and CV stage would include unnecessary and misleading data.

Quote:
A ~15-20% increase in charge power does not equate to a ~33% reduction in charge time.
The chart is using real data recorded from actual charges. Both tests were done with the same pack, from the same state of charge using the same power supply.

From that data, we see that a charger's maximum wattage cannot be defined by a single number, as many believe. For instance the PL6 example is 860 watts from start to finish. Whereas the 30 amp limited (ala 306b) starts around 700 watts, reaching its peak of 756 watts at the end of the charge. So if the 306b is only putting out its max wattage at the last minute of the charge, 760 watts it can not be fairly compared to Powerlab6 that is putting out 860 from the start of the charge.

While I did attempt explain this in the test, I know that boiling this down to a single number (CC stage in minutes) seemed a much simpler way to summarize the wattage differences.
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May 09, 2012, 11:03 PM
Registered User
Gotcha and understand.

Note however, that CV stage will be longer with higher current so a portion of the minutes saved during CC stage will then be lost during CV stage. Other variables obviously come into play as well (charge lead length and gauge, battery internal resistance, etc.) that could further reduce the differences. I do completely agree that the PL6 will offer greater power and lower charge times off 24 volts than the 306B. A 15% reduction would be a reasonable expectation, in my estimation.

Have not followed the PL6 thread for a bit but wondering if Tim and company are pondering a firmware update that will raise the input current limit to, say 50A, in similar fashion when the PL8 power was increased via firmware update. I'm sure this would make a lot of folks happy...

Mark
May 10, 2012, 11:24 AM
Registered User
Mark - i'm using your power supply with the 306B. I parallel charge 6 4s 4000 lipos at 30A. So i'm only pulling about 444Watts?
May 10, 2012, 11:39 AM
Registered User
When charging 4S lipoly at 30A, wattage from PS estimate as follows:

4 (# cells in series) x 4.2 (volts/cell) x 30 (charge current) = 504 watts (charge power at batteries)

Include about 15% losses within charger DC-DC converter, charger output lead, charger input lead, etc.: 504 / .85 = ~ 600 watts.

I typically like to have a good 20-30% headroom in my power supply. As you can see, you have a LOT of headroom and could even power a second charger quite easily.

Mark
May 10, 2012, 02:28 PM
Registered User
so i could in theory, probably power another 306B at 30A depending on the batts i'm charging. This is assuming the PS puts out about 1200W, right?
May 10, 2012, 03:21 PM
Registered User
Absolutely. Your particular PS will do 1200 watts all day long.

Mark
May 11, 2012, 12:10 AM
Registered User
thanks, Mark. BTW, the PS is working out beautifully.
May 17, 2012, 10:54 PM
Registered User
Hey I just put a 3010B into operation today and have an issue.

When I plug a some 3S BATT's into a Progressive RC parallel board the charger is intermittently sensing a 4th cell and displaying a low voltage error when I try to balance charge. This ocurrs with multiple BATT's on the board or singles.

I checked all the set-ups and could find nothing out of order. Is my parallel board suspect?


Greg
May 18, 2012, 12:30 AM
Registered User
It definitely sounds as though there is either an issue with your parallel board or the balance board that connects to your 3010B. The issue can be isolated by using a continuity tester to verify that all connections within each board are correct and that there are no shorts or intermittents. You can also remove the bottom or each board and perform a visual inspection as well to ensure that there are no loose conductive particles.

Presume that you have no issue when charging a single 3S pack directly to the charger's balance board and main output?

Mark
May 19, 2012, 06:30 AM
That's a funny word
Neat topic , it would be nice to be able to select a higher cell count on LIPO for an unbalanced charge to take advantage of the 42 volt output capability. OR allow the 306 B to have 40 amp current , 35 maybe?
Last edited by gulio; May 20, 2012 at 06:23 AM.
Apr 20, 2013, 06:06 PM
Suspended Account
Great thread you got here, I am trying to make a decision between these 2. Does the 306B have 2-6 balancing jacks already on the side? I see a picture on New Zealand's ICharger site. Is there a main ICharger site? I cant seem to find anything except the New Zealand site

http://www.icharger.co.nz/Products/306B.aspx
May 07, 2013, 07:23 PM
Suspended Account
I bought the 306B and what a great little charger it is. I can now finally do some quick storage charging. I like the simple layout with the 4 metal buttons. No scroll wheels! Yippee! For now I just bought an inexpensive 10 amp power supply to get going. I will get a bigger one later, I may want more of these 306B's.
Feb 22, 2014, 01:56 PM
Registered User
I just got the 306b. I have a Q. If I set the discharge rate to 10A it only does 3.5A. How do I get a discharge rate higher than 3.5A?
Feb 22, 2014, 02:24 PM
Registered User
Quote:
Originally Posted by Evanspa
If I set the discharge rate to 10A it only does 3.5A. How do I get a discharge rate higher than 3.5A?
You'll have to use "regenerative discharge" or "expanding discharge" mode in order to discharge at higher current with your specific pack as the 306B is limited to 80 watts internal discharge power. Both of these methods are covered in the manual as well as in this forum.

Also, deleting your cross post would make the moderators happy.


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