[RE-wrenches] low batteries with a sunny island

[Glenn Burt]

We have invested in an Iota charger with the IQ4 board for this purpose.

Pricy, yes, but seems to have the best chance of success for reviving the
bank as a unit.

http://www.iotaengineering.com/dls5413.htm

 

-Glenn

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of August Goers
Sent: Wednesday, November 17, 2010 9:54 PM
To: re-wrenches at lists.re-wrenches.org
Subject: [RE-wrenches] low batteries with a sunny island

 

Hi All Battery Friendly Wrenches -

 

We have a situation I haven't crossed yet - we have a Sunny Island grid tied
battery back system system with a 48 V battery bank consisting of eight 6
Volt AGM batteries. The charging breaker feeding the Sunny Island in the
main electrical panel was shut off by another contractor for about 3 months
which caused the Sunny Island to slowly drain the batteries until it fully
shutoff in order to protect the batteries. The bank now reads 24  Volts.
That's low! The Sunny Island is, according to SMA, powered directly from the
battery bank and won't even turn on. SMA tech support is recommending that
we charge the batteries and then turn the system back on. 

 

Any ideas about the best way to charge a 48 V battery bank?

 

Thanks for your advice,

 

-August


-- 
August Goers
VP, Engineering

Luminalt Energy Corporation
1320 Potrero Avenue
San Francisco, CA 94110
O: 415.641.4000
M: 415.559.1525
august at luminalt.com

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