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

[William Dorsett]

This discussion reminds me of the microgrids installed in Nepal. Once they
had electricity, villagers loaded down their houses with loads they could
never have before.  Soon the NGO's were searching houses for browned out
light bulbs with flashlights. In Nepal they could use fuse wire. Whether it
is a fishing camp, a neighborhood system or simply members of the same
family, and regardless of the technology, this is a chronic conflict of
social responsibility vers "I'll get mine." It will remain an issue with
microgrids.

Bill Dorsett

-----Original Message-----
From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On
Behalf Of Mark Frye
Sent: Saturday, June 06, 2015 8:40 AM
To: RE-wrenches
Subject: [RE-wrenches] SI/SB MicroGrid - Recovery From Low Battery Shut Off

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
_______________________________________________
List sponsored by Redwood Alliance

List Address: RE-wrenches at lists.re-wrenches.org

Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive:
http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out or update participant bios:
www.members.re-wrenches.org