Oct 04, 2010, 03:32 PM Registered User Newcastle, New South Wales, Australia Joined Sep 2007 2,373 Posts Tim, Will the charger achieve these higher outputs on a 24volt supply? (ie two lead acids in series) Regards Peter
 Oct 04, 2010, 03:37 PM Southern Pride Haralson County GA. USA Joined Oct 2004 34,852 Posts Thanks Tim. This has been one of the hardest bits of insider info I have ever had to set on ever . I really wanted to tell everyone they needed to think more powerful when shopping for a power supply or two. Charles
Oct 04, 2010, 03:51 PM
President, FMA, Inc.
Joined Mar 2008
1,068 Posts
Quote:
 Originally Posted by Peter M Tim, Will the charger achieve these higher outputs on a 24volt supply? (ie two lead acids in series) Regards Peter
Hi:

Great question!

Here's the math:

The 1344W comes from full charge on a 8s Li battery, so:

8 x 4.2V = 33.6V x 40A = 1344W

PSU required to achieve full output watts is calculated as follows:

1344W / 0.85 (worst case efficiency) = 1581W required input

PSU required output voltage to achieve full output watts is calculated as follows:

1581W / 60A (max current) = 26.35v

So to achieve the PL8 v2 full power level, we recommend min 26.35v, 60A supply. The PSU should be over-rated on watts at least 10%, so at least 1700W.

I have it on my to-do list to update the PL8 Power Spreadsheet. Should post this information sometime this week.

Tim Marks
 Oct 04, 2010, 07:16 PM Registered User Melbourne, Australia Joined May 2006 6,407 Posts Congratulations, that is an impressive boost in power rating without having to change the hardware. So with the new 60A input limit the max output power from a 12V supply would go up to about 12 x 60 x 0.85 = 612W and from a 24V supply to 1224W. Is LiMn the new chemistry that was added ? Are you considering adding support for the new 1.6V-nominal NiZn cells?
Oct 04, 2010, 08:14 PM
President, FMA, Inc.
Joined Mar 2008
1,068 Posts
Quote:
 Originally Posted by kgfly Congratulations, that is an impressive boost in power rating without having to change the hardware. So with the new 60A input limit the max output power from a 12V supply would go up to about 12 x 60 x 0.85 = 612W and from a 24V supply to 1224W. Is LiMn the new chemistry that was added ? Are you considering adding support for the new 1.6V-nominal NiZn cells?
Hi:

Correct, correct, and no new presets have yet been added, only "provisions" for new chemistries. This is to say in v2, additional memory was allocated to allow for new chemistries. Yes, I believe NiZn is a possibility down the road.

Tim Marks
 Oct 04, 2010, 08:43 PM Registered User Joined Dec 2006 1,170 Posts I just got the new epbuddy paraboard and remember reading somewhere that it was not compatible to the pl8, is that true and if so, how do I make it compatible?
Oct 04, 2010, 08:48 PM
Registered User
United States, MI, Grand Rapids
Joined Sep 2007
376 Posts
Outstanding!! Thanks, Tim/FMA!!!

Charles, I noticed you were running v3.2 when you mentioned the new graph coming out... I can only imagine your pain, serves you right!!

Actually, this free upgrade is going to cost me!! Good timing, though. I'm in the process of finishing my basement and I'm 80% done with electrical. I decided to bring a second dedicated 20 amp line my "Heli Layer" to make it somewhat future proof. If 40 amps of service to one 12'x12' room isn't enough I can always run an extension cord from the bathroom next door...

Quote:
 Originally Posted by GhostRider32 I just got the new epbuddy paraboard and remember reading somewhere that it was not compatible to the pl8, is that true and if so, how do I make it compatible?
Frankly, that topic needs its own thread. For those that want to parallel charge and have many different cell counts they would like to charge from time to time, it's a mess, IMO... If I'm allowed one gripe, their node arrangement is it...
Last edited by SpeedVision; Oct 04, 2010 at 09:00 PM.
 Oct 04, 2010, 08:56 PM Registered User United States, MI, Grand Rapids Joined Sep 2007 376 Posts Moved up...
 Oct 04, 2010, 08:57 PM Southern Pride Haralson County GA. USA Joined Oct 2004 34,852 Posts My first post running V2 which was months ago. If you look at the lower right had corner of most of my PL8 graphs posted since then they were in fact V2. http://www.rcgroups.com/forums/showp...&postcount=916 My pain was not being able to let everyone know they needed bigger power supplys than they though and that the PL8 was soon to be the most powerful one and cost per watts of charging power was really going to go down. Charles
 Oct 04, 2010, 08:58 PM Registered User Seattle Joined Sep 2007 2,437 Posts Very nicely done FMA! Many don't quite realize the 1000 watt rating is based on 8s packs. A 1000 watt charger can only charge a 6s pack at 756 watts. With this no charge update we can now charge a 6s pack at a full 1008 watts. My only question is "how many non-FMA banana plugs will be melted by that 40 amps?" Last edited by Gregor99; Oct 04, 2010 at 10:15 PM. Reason: Transposed numbers
Oct 04, 2010, 09:54 PM
Registered User
Joined Dec 2006
1,170 Posts
Quote:
 Originally Posted by SpeedVision Frankly, that topic needs its own thread. For those that want to parallel charge and have many different cell counts they would like to charge from time to time, it's a mess, IMO... If I'm allowed one gripe, their node arrangement is it...

Frankly, I think it fits perfectly here. Most people are buying this charger with the specific intent of parallel charging including myself and the paraboard is the slickest parallel charging board out IMO. You don't want to parallel charge, no one cares but I don't remember anyone appointing you as thread moderator about what goes in this thread.
Oct 05, 2010, 01:24 AM
Registered User
United States, OR, Beaverton
Joined Feb 2008
1,976 Posts
Quote:
 Originally Posted by GhostRider32 Frankly, I think it fits perfectly here.
I can think of a better place to find the info that you seek. http://www.rcgroups.com/forums/showt...4#post16049235
 Oct 05, 2010, 05:15 AM Registered User Joined Dec 2006 1,170 Posts Thats a very constructive way to answer my question. It is the info I need. Thanks.
Oct 05, 2010, 06:06 AM
Registered User
United States, MI, Grand Rapids
Joined Sep 2007
376 Posts
Quote:
 Originally Posted by GhostRider32 Frankly, I think it fits perfectly here. Most people are buying this charger with the specific intent of parallel charging including myself and the paraboard is the slickest parallel charging board out IMO. You don't want to parallel charge, no one cares but I don't remember anyone appointing you as thread moderator about what goes in this thread.
Wow, cranky much! For the record, my intention was not to slam your choice to post here or not, it was to suggest that the answer is not simple and could be a topic on its own... That makes me a contributor, not a moderator. I have a PL8 and a Paraboard, so I know first hand what the challenges are. Paraboard great balance board that was designed primarily around the ICharger line (and a few others that use the same type node connection). Short answer, PL8 and the Paraboard are not compatible without having a box of custom adapters on hand... Steve already showed you where the PB thread, so good luck...