[RE-wrenches] RETURN AMP SETTING

[James Surrette]

Hi Dana, 

Sorry for the delay - been on the road.  Not sure if this has already
been presented / discussed. 

The old standby from industrial chargers, is 100% SOC is reached when
charge current drops to 2% of capacity (normaly based on 6 or 8 hr
rate).  Please note, this comes from an era of constant voltage with 8
hrs to recharge then rest the batteries.  However, it is an accurate
indication of full charge. 

Time for acid mixing?  Now that is a tough one!  GC2 & L16's would be
close in 30 mins or ~ 10 - 15 mins per 100AH once full charge has been
attained however, not sure we can apply to larger format cells.    

Regards, 

Jamie 

>>> "Dana" <dana at solarwork.com> 7/21/2010 7:54 PM >>>

As the % of full charge is related to the of degree absorption &
gravity [the denser & more charged acid descending, and lighter acid
rising] @ what point in the absorption would be prudent to stop
charging? 
   
I used to cut off the charge on the Trace SW series at 12 “return
amps”, VS. the factory default I think was at 5 amps.  This has &
continues to work well but I never had anyone really answer this
function clearly. 
   
Is there a battery manufacturer  or wrench that would care to comment
on the:   
The minimum “Return” amps to disconnect for a “full”  charge? 
OR 
The time required per 100 AHR after reaching the Absorption point
setting for the mix to occur? 
   
I realize that battery construction, battery condition, age and
temperature and the current power usage will also play into this factor
and it may not be a simple answer. 
   
   
   
   
   

 Dana Orzel 
   
Great Solar Works, Inc 
E - dana at solarwork.com 
V - 970.626.5253 
F - 970.626.4140 
C - 970.209.4076 
web - www.solarwork.com 
Responsible Technologies for Responsible People since 1988" 

   

From:re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Mark
Frye
Sent: Wednesday, July 21, 2010 4:25 PM
To: Allan at positiveenergysolar.com; 'RE-wrenches'
Subject: Re: [RE-wrenches] Propane Generator, Dual Outback Inverters 

  
Allen, 
  
Can I infer that if you are shutting off the gen before charge rates
drop in absorption that you are running only briefly in the absorb
phase? Or do your charge currents remain high through out an extended
absortion phase? 
  
Perhaps you have plenty of PV which you rely upon to bring the
batteries up through the absorption phase, once the gen is shut off. 
  
I would be interest to learn more about your approach to this. 
  
Thanks, 
 
Mark Frye
Berkeley Solar Electric Systems
303 Redbud Way
Nevada City,  CA 95959
(530) 401-8024
www.berkeleysolar.com  

  

  

From:re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Allan
Sindelar
Sent: Wednesday, July 21, 2010 3:17 PM
To: re-wrenches at lists.re-wrenches.org
Subject: Re: [RE-wrenches] Propane Generator, Dual Outback Inverters 
The Onan RS20000 shown in the generators article in HP 131 page 98 has
performed flawlessly as backup support to an Outback quad-stack of
VFX3648s. Differences, however, are that this 20kW gennie charges four
inverters, rather than two; the elevation is 6,600 feet for about a 20%
output deration; there are no huge loads above charging draw; and the
client is aware enough to shut it off before absorption reduces the
charge rate - all different conditions than you have described, as the
gennie is usually fully loaded and running in balance.

Darryl is right about the amount of words necessary. 

AllanSindelar
Allan at positiveenergysolar.com ( mailto:Allan at positiveenergysolar.com )
NABCEP Certified Photovoltaic Installer
EE98J Journeyman Electrician
Positive Energy, Inc.
3201 Calle Marie
Santa Fe, New Mexico 87507
505 424-1112
www.positiveenergysolar.com 

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