[RE-wrenches] SI/SB MicroGrid - Recovery From Low Battery Shut Off

[Mac Lewis]

Hi Mark,

The Sunny Island has various battery protection modes and will shutdown
based on user programmable state of charge levels. Level 2 battery
protection will start the Sunny Island every 2 hours in an attempt to get
charge into the batteries.  You should set this level up at times when
energy input is likely.  See page 113-114 here:
http://files.sma.de/dl/15216/SI4548-6048-US-BE-en-20.pdf  If it doesn't get
any charging to the batteries for 10 minutes, it will shut down and wait
again.

This is an advantage of having at least some DC coupled solar input.



On Sat, Jun 6, 2015 at 7:39 AM, Mark Frye <markf at berkeleysolar.com> wrote:

> Hi Guys,
>
> Just wondering about how a SI/SB microgrid works. If all the PV is
> connected to SB inverters, what happens if the loads manage to drain the
> batteries to their low voltage shutdown? Wouldn't the SB stop providing the
> AC sync so then the SB wouldn't have anything to sync to even if they had
> power available from the PV?
>
> How is this handled? It seems to me you would always want to have some
> amount of PV DC coupled.
>
> Thanks,
>
> Mark Frye
> Berkeley Solar Electric Systems
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-- 



Mac Lewis

*"Yo solo sé que no sé nada." -Sócrates*
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