SMA Sunny Island three phase multi clustering [RE-wrenches]

[John Berdner]

Larry/Wrenches:

All Sunny Island 5048U inverters in the same cluster are programmed at
the master unit.  All of the other invretrs in the cluster are
controlled by the master unit to avoid any issues of coordination.  In
other words you should never see a situation where one is charing while
another in inverting.

A cluster is defined as a single battery and single load circuit. 
Larger systems are possible by splitting the loads up into multiple sub
panels with a single cluster (and battery bank) feeding each sub-panel.
A single large generator can be used to feed multiple clusters of Sunny
Island 5048U inverters and connected loads. It is also possible to
switch some of the Sunny Boy power between clusters based on state of
charge using the programmable relays in the Sunny Island =. This helps
to balance the solar resource between imbalanced loads on the different
clusters.

Best Regards,

John Berdner

>>> larry at starlightsolar.com 11/29/07 12:38 PM >>>


Mark Frye wrote:
This location has one 60kW generator. If it is running, all inverters 
will be in bypass and be charging the batteries. So this should not 
matter.

Larry

> 
> Could it be the same reason that I went to OB instead of Xant when I 
> needed a large multiple inverter system...not being able to coordinate

> the individual charge controllers?  OB sets a master inverter/charge 
> which defines the charge control functions, the other
inverter/chargers 
> are slaved to those settings, avoiding the situation where one 
> inverter/charger is charging when another is inverting.
> 
> I wonder if this same level of coordination is available with the SMA,

> it certainly was not available with the Xant.


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