[RE-wrenches] Small battery bank vs too large array

[Drake]

Hello Wrenches,

Where can I get a device that will measure current through a shunt 
and create a signal to trigger a relay?

We want to be able to use a 2 kW array with four, 200 AH sealed 
batteries on an Outback system.  2 kW of PV would be too much 
amperage for the batteries.  The idea is to open relays to disengage 
strings in conditions of high current to the batteries.

The reason for this is to create backup systems where power will be 
abundantly available when the sun shines. The system will normally 
connect to the grid, except during outages.  In normal charging 
conditions the power will go straight to the grid.  When the grid is 
down, power will be available for loads and battery charging, but 
batteries will be protected from overcharge?

Any suggestions on ways to accomplish this are welcome!

Thanks

Drake


Drake Chamberlin
Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV Installer
740-448-7328
<http://athens-electric.com/>http://athens-electric.com/
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