We use a protective relay, unless using Sunny
Islands. In this case, the relay will be
controlled by the programmable AUX relay's12 V
signal. Magnum does have a phase shifting
function, but does not recommend relying on it.
At 04:40 PM 7/3/2014, you wrote:
Wrenches
I have not seen either a OB, Trace or Magnum do
a even far job of charge control or voltage
limiting for the batteries during AC coupling as
this is when the transformer is basicly going
backwards, it can and does but even outback says
you need to do a AC discounting means or AC or
DC load dumping. We have used OB VFX for years
as a AC coupled device but always have some way
to prevent over charge of the batteries.Â
On Thu, Jul 3, 2014 at 12:42 PM, Drake
<<mailto:drake.chamber...@redwoodalliance.org>drake.chamber...@redwoodalliance.org>
wrote:
Hi Larry,
In this case, the Enphase will AC couple with
the Magnum in the protected loads panel. The AC
out of the Magnum provides the micro grid to
which the Enphase connects. If  charging
exceeds loads, when the grid is down, power will
go to the batteries (up to the high battery
voltage set point). If loads are greater than
the output of the Enphase system, the Magnum
will produce power to feed the loads.
Thanks,
Drake
At 10:55 AM 7/3/2014, you wrote:
Hi Drake,
If the Enphase are online, up to 60 amps (30A @
240V) can be transferred through the Magnum
inverter to loads. The inverter is not providing
power to loads at that time. If the Enphase go
offline, the Magnum takes over using power from
the battery. If the load is greater than your
Enphase system can provide, the Magnum will
transfer to battery power based on the VAC
dropout setting. You probably want to use the
UPS mode (read ME-ARC manual about this).
The new Magnum MSH models can combine AC input
power and battery power to increase the total AC
output capacity for starting heavy loads.
Larry
On Jul 3, 2014, at 7:59 AM, Drake
<<mailto:drake.chamber...@redwoodalliance.org>drake.chamber...@redwoodalliance.org>
wrote:
This information helps greatly. I really appreciate all of your expert advice.
One other wild card in the installation is that
the inverter is going to be AC coupled with an
Enphase system. The Enphase system will
contribute greatly to the overall power
available in the protected loads panel. But,
with Magnum's slow voltage response I'm not sure
if the Enphase system will drop off line when
the pump surges, or if the Enphase power will be
available to help with the startup surge.
Any insights on this?
Thank you,
Drake
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