RS 485 link [RE-wrenches]

[Drake Chamberlin]

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I have a question for John Berdner.

We are getting ready to install a system with two, SI 4200s, a SB 
6000 US and a 2500 U.  We were told that there is some question as to 
whether the RS 485 communications link will work with this particular 
equipment.  Is there a problem?

Thanks,

Drake


5) Lastly, you should plan on adding an RS485 communications link
between the SI's and the SB's.  This is suggested so that the SI's can
control the output power of the SB's when the grid goes down.  If the
communications link is not used, the SI's will automatically trip the
SB's offline when the batteries are full and the load current is less
than the generation current. While this approach does work, it is a
brute force method.  In contrast, the communication link allows the SB's
to stay online but the SI will command them to derate their output power
to match the loads.  The message displayed when the SI's are controlling
the SB output power is "derating ##" (where ## is the percentage the
SB's are derated)


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