[RE-wrenches] Magnum and Pumps

[Jerry Shafer]

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.


On Thu, Jul 3, 2014 at 12:42 PM, Drake <drake.chamberlin at 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 <drake.chamberlin at 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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