Oct 30, 2011, 03:41 PM
Registered User
So. Cal.
Joined Oct 2004
9,734 Posts
Quote:
 Originally Posted by Tim Marks Using question 4 of the ss, inputting your PSU and battery info, the max output current will be 19.4A (worst case).
Presuming that the calc program assumes 90% DC-DC conversion efficiency to get this number?

4.2 X 5 X 10 / 12 / .9 = ~19.4A

Quick question - Do the PL8 and PL6 have charge lead voltage drop compensation? e.g. - When charging lipolys, does the charger switch from CC to CV mode when the main output reaches 4.2 x cell count or when the first cell reaches 4.2 volts as sensed by the balance lead?

Mark
Oct 30, 2011, 05:35 PM
President, FMA, Inc.
Joined Mar 2008
1,078 Posts
Quote:
 Originally Posted by mrforsyth Presuming that the calc program assumes 90% DC-DC conversion efficiency to get this number? 4.2 X 5 X 10 / 12 / .9 = ~19.4A Quick question - Do the PL8 and PL6 have charge lead voltage drop compensation? e.g. - When charging lipolys, does the charger switch from CC to CV mode when the main output reaches 4.2 x cell count or when the first cell reaches 4.2 volts as sensed by the balance lead? Mark
Hi:

It's actually 85% efficiency (worst case).

40A input current limit

12V * 40A = 480W

480W * .85 = 408W available at output

408W / (4.2 * 5) = 19.4A

Tim Marks
 Oct 30, 2011, 06:42 PM Registered User So. Cal. Joined Oct 2004 9,734 Posts Ok, I see that the calculation is based upon max input power limitation. Thanks Tim. Have searched and still cannot find an answer to my above question: "Do the PL8 and PL6 have charge lead voltage drop compensation? e.g. - When charging lipolys, does the charger switch from CC to CV mode when the main output reaches 4.2 x cell count or when the first cell reaches 4.2 volts as sensed by the balance lead?" Thanks, Mark
Oct 30, 2011, 08:21 PM
Seattle
Joined Sep 2007
2,610 Posts
Quote:
 Originally Posted by mrforsyth "Do the PL8 and PL6 have charge lead voltage drop compensation?
Voltage readings are taken without current flowing. There is no voltage drop when there is no current.

http://www.rcgroups.com/forums/showp...4&postcount=32
 Oct 30, 2011, 08:31 PM Registered User So. Cal. Joined Oct 2004 9,734 Posts Of course there is no voltage drop at zero current. This is not my question. My question is: "When charging lipolys, does the charger switch from CC to CV mode when the main output reaches 4.2 x cell count or when the first cell reaches 4.2 volts as sensed by the balance lead?" Mark
Oct 30, 2011, 08:33 PM
Seattle
Joined Sep 2007
2,610 Posts
Quote:
 Originally Posted by Tim Marks If you have one FUIM2/FUIM3, you can use it with any number of Revolectrix products. Some like the idea, and I guess some don't.
Count my vote in the "like it" column. Also with the PL6 or 8, a single FUIM can be used to drive multiple chargers in expansion mode, or by adding a switch can be used to control and update either charger seperately when not in expansion mode. Switching between chargers does not require disconnecting and reconnecting the USB cable. Very handy when you need to perform a firmware update on both chargers.
Oct 31, 2011, 11:15 AM
AR-15 BRD!
Frederick, MD
Joined May 2002
1,052 Posts
PL8/PL6 Expansion Channel Video

 PL8/PL6 Expansion Channel Video (10 min 34 sec)
Oct 31, 2011, 11:31 AM
President, FMA, Inc.
Joined Mar 2008
1,078 Posts
Quote:
 Originally Posted by mrforsyth Of course there is no voltage drop at zero current. This is not my question. My question is: "When charging lipolys, does the charger switch from CC to CV mode when the main output reaches 4.2 x cell count or when the first cell reaches 4.2 volts as sensed by the balance lead?" Mark
Hi:

Before the first cell reaches 4.200V, the balancer is turned on. We use 1 amp balancers, which are the industry’s largest. This allows the other cells to catch up. Mostly the pack is balanced before CV occurs. But once the highest cell reaches the set charge voltage, the current starts reducing and CV begins.

Tim Marks
Nov 11, 2011, 09:04 PM
President, FMA, Inc.
Joined Mar 2008
1,078 Posts
Whoop There It Is!

The first production unit, PL6...

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 Nov 12, 2011, 03:16 PM Perfect 3pt inverted landing! USA, AL, Huntsville Joined Oct 2008 3,089 Posts Cool! Really excited to get mine.
 Nov 18, 2011, 02:08 AM Registered User Joined Nov 2011 117 Posts My Two PL6 shipped out today. What's the expansion feature?
Nov 18, 2011, 04:45 AM
Registered User
USA, GA, Marietta
Joined Aug 2005
8,465 Posts
Quote:
 Originally Posted by teeforb My Two PL6 shipped out today. What's the expansion feature?
Nov 18, 2011, 08:53 AM
Registered User
Joined Nov 2011
117 Posts
Quote:
 Originally Posted by ggcrandall1 Your second PL6.
I know it's for two, but I dont understand the point. What's wrong with just using them seperate?
 Nov 18, 2011, 09:22 AM Perfect 3pt inverted landing! USA, AL, Huntsville Joined Oct 2008 3,089 Posts My understanding is that expansion mode just makes it so you don't have to push so many buttons since the second charger "mirrors" the preset of the primary charger.
Nov 18, 2011, 09:22 AM
Registered User
Joined Nov 2011
117 Posts
Quote:
 Originally Posted by teeforb I know it's for two, but I dont understand the point. What's wrong with just using them seperate?
I spent a little more time to read the bullets. I'm not sure if I can capitalize off of this feature. I'll be running packs at different times