A possible option, that would lend complexity to
the system, would be to use a relay driver to
drop banks of micro inverters and end up with one
or two charging when the battery voltage is at
absorb. It wouldn't be perfect, but a significant improvement.
At 11:25 AM 10/26/2015, you wrote:
From my discussions with Enphase at
Intersolar/SPI I do not believe their first gen
battery will be capable of or designed for
battery backup, it was designed for "energy
management" as mentioned. Sounded like it would
be another year at least before they staart
selling it for battery backup systems. But...we will see.Â
I also think the Outback GSLC175-AC-120/240 is
a good choice for integration with Enphase. But
since their ROCB is basically a blackout relay
the system isn't likely to ever 3 stage charge
lead acid batteries when the grid is down, so if
this guy really thinks the grid is going down
forever you might not want to mention that to
him. This is much better design for grid-tied
battery backup systems with lead acid which
wouldn't be damaged  just hitting bulk voltage
and not going through absorb the few times a
year the grid is likely to be down.Â
Rebekah
On Mon, Oct 26, 2015 at 9:51 AM, Drake
<<mailto:drake.chamber...@redwoodalliance.org>drake.chamber...@redwoodalliance.org>
wrote:
Hello Dan,
We are preparing to install a similar system.
Enphase now allows AC coupling. We have
specified the Radian. The batteries will be
Concorde AGM, either 305 or 405 AH. Concorde
AGMs are useful because they can take a very
fast charge rate. With over 6 kW available to
charge batteries, the charge rate would exceed
C/5 for an L-16 battery, which the Concorde L-16
(405 AH) can easily handle with one string. The
Concorde 305 AH can handle it also. The Radian 8048 can AC couple 6kW.
The Radian GSLC175-AC-120/240 load center is set up for AC coupling.
Drake
Drake Chamberlin
Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328
<http://athens-electric.com/>http://athens-electric.com/
At 06:32 PM 10/25/2015, you wrote:
Esteemed wrenches;
I have a new client who has convinced himself
the world as we know it will be ending in the
next few months. He has ~6kW of Enphase and
wants to add battery backup for critical
loads.....quite a few of them. I recommended he
buy some Kill-a-Watt units and start to monitor kWh usage.Ã
My first thought was the new Enphase "AC
Battery system." Is this even available for
purchase yet, and if so has anyone here tried
it? I'm thinking ease if compatibility, tech support, warranty......
Otherwise will likely AC couple a new
inverter.ÃÂ I was thinking an Outback Radian,
and lithium batteries (looking at Iron Edison)
as my prediction is they will be mostly sitting
idle for the next 10 years at least. Any
pitfalls, horror stories, and no-nos anyone is
willing to share? Crossed off NiFe; my house
runs on them and they are fairly
high-maintenance, as I predict this client will be.
Dan Fink
Adjunct Professor, Ecotech Institute
IREC Certified Instructor for:Ã
~ PV Installation Professional
~ Small Wind Installer
Executive Director, Buckville Energy
NABCEP / IREC / ISPQ Accredited Continuing Education Providers
<tel:970.672.4342>970.672.4342
Ã
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