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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. <br><br>
<br>
At 04:40 PM 7/3/2014, you wrote:<br><br>
<blockquote type=cite class=cite cite="">Wrenches<br>
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. <br><br>
<br>
On Thu, Jul 3, 2014 at 12:42 PM, Drake
<<a href="mailto:drake.chamberlin@redwoodalliance.org">
drake.chamberlin@redwoodalliance.org</a>> wrote:<br>
<dl>
<dd>Hi Larry,<br><br>
<dd>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.<br><br>
<dd>Thanks,<br><br>
<dd>Drake<br><br>
<br>
<dd>At 10:55 AM 7/3/2014, you wrote:<br>
<dl>
<dd>Hi Drake,<br><br>
<dd>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).<br><br>
<dd>The new Magnum MSH models can combine AC input power and battery
power to increase the total AC output capacity for starting heavy
loads.<br><br>
<dd>Larry<br><br>
<br><br>
<dd>On Jul 3, 2014, at 7:59 AM, Drake
<<a href="mailto:drake.chamberlin@redwoodalliance.org">
drake.chamberlin@redwoodalliance.org</a>> wrote:<br><br>
<dd>This information helps greatly. I really appreciate all of your
expert advice.<br><br>
<dd>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.<br><br>
<dd>Any insights on this?<br><br>
<dd>Thank you,<br><br>
<dd>Drake<br>
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