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

[Jerry Shafer]

This seams to be a very common ovetsite by some solar pro's you are correct
if the system shuts down even in the case of an SI battery sensor or low
voltage the entire system is down, if there is a genny on site this may
prevent it if it has fuel. I see this issue and get asked a lot what can be
done and a simple but not cheap fix is to put part of the array on a CC
with some panels just to help the battery connect voltage come back. The
newer SI software will increase run tome to give the inverters time to
re-start before the crash again, this will help once you get your voltage
back up. We have also used a 48 volt battery charger to do this with a back
up genny. I am sire there has to be some other work arounds but this is
what I have done.
Jerry
Ca, Hi, Tx, Co, Nv, Gm.
On Jun 6, 2015 6:39 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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