[RE-wrenches] Charging voltages

Dave Palumbo dave at independentpowerllc.com
Mon May 13 19:46:54 PDT 2013


Jesse,

Check with manufacturer to be sure. I've had AGM's in 24v system's set at
29.2 Bulk/Absorb and other manufacturers (Full River for one) that say 29.6
is fine. So, with an FM80 I would recommend 4 strings of 2 modules to ensure
that you can always get that VMP up where it needs to be.

David Palumbo
Independent Power LLC 
462 Solar Way Drive
Hyde Park, VT 05655
www.independentpowerllc.com 
Vermont Solar Partner
25 Years Experience, (802) 888-7194 



-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Jesse Dahl
Sent: Monday, May 13, 2013 10:34 PM
To: Wrenches
Subject: [RE-wrenches] Charging voltages

Hello,

I'm interested in charging voltages for AGM batteries. After my visit to the
site mentioned in the battery box thread, I was thinking about the system. 

New install, 8 solarworld 255s charging a 24V battery bank through a outback
FM80 (MPPT) All 8 modules in parallel.  
VOC - 37.8
VMP - 31.4
ISC - 8.66
IMP - 8.15

I'm interested in the setpoints people use for AGMs because it seems like
this might be cutting it close to the setpoints based on the array voltage.
Since the system is using a MPPT controller would it be better to increase
the array voltage?  

Battery bank is 6 12V 245ah east penn bats wired 3 strings of 2.

I haven't used sealed batteries outside my fish house and boat so I'm
looking for some detailed info if I can get it. 

Thanks a lot!

Jesse
 

Sent from my iPhone
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