AGM max voltage limit? : All Things Hardware For Solar Installations

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AGM max voltage limit?

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Frank

Post subject: AGM max voltage limit?

Posted: Tue Jan 13, 2004 3:52 pm GMT EthGMT

Minnow

Joined: Sun Nov 03, 2002 2:01 am GMT ErdGMT
Posts: 20
Location: Maine

What would you folks suggest for a max voltage limit for this type of battery? i.e. the voltage at which it's no longer safe to charge the battery? There's a software limit in the SW4024 for this. I'm using Concorde batteries but haven't seen anything on their web site and they haven't responded to my email.

TIA

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Solar Guppy

Post subject: AGM max voltage limit?

Posted: Wed Jan 14, 2004 10:25 pm GMT EthGMT

Red Cobra Delta Guppy

Joined: Sun Jun 02, 2002 1:01 am GMT EndGMT
Posts: 1159
Location: Lakeland Florida

The Short answer is use wet lead-acid values

Concorde Web Specs

From Concordes web-site:

<BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote

Quote:

Charging Instructions: Initial charge or recharge - 2.37 to 2.40 volts per cell at 25 C (77 F). Float charge - 2.23 volts per cell at 25 C (77 F). Equalize charge - 2.40 volts per cell at 25 C (77 F). Temperature compensation - Â±3.75 mV. per cell per degree C [Reference to 25 C (77 F)]. This is for battery temperature (not ambient temperature) and is useful for battery temperatures from 0 C to 40 C.

Battery FAQ

[ 01-14-2004: Message edited by: Solar Guppy ]

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Frank

Post subject: AGM max voltage limit?

Posted: Fri Jan 16, 2004 3:43 pm GMT EthGMT

Minnow

Joined: Sun Nov 03, 2002 2:01 am GMT ErdGMT
Posts: 20
Location: Maine

Hi,

Thanks for the reply. I have those numbers and have been using them, but I read in a HomePower article ("Blackout Buster") where they limited the absolute voltage to 29 VDC on AGM's (33 VDC for wet cells) and was trying to understand their reasoning a bit more (i.e. high-voltage-cutout). I've got mine set to 31 VDC and it doesn't crash during charge cycles, so I guess that'll have to do.

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