[RE-wrenches] Fortress LFP batteries and Outback charge controller

[Kirk Herander]

All,

I'm wondering if there are any precautions if charging a Fortress Evault
LFP bank using 1 or more OB charge controllers, in tandem with an Envy
inverter PV input.

I know it will have to be programmed differently, and it will be open loop,
no CC control from the BMU,.

This is a net metered system using a Fortress 12 kw inverter. The total PV
input of the inverter is 21 kw. Max sell back is 12 kw, while charging
batteries at 6 kw.

My issue is the customer has his heart set on maxing out the roof capacity
at 25 kw. And I don't really need to add a second inverter for
critical loads, Only to increase integrated DC-coupled PV capacity.

So I feasibly put part of the array on external charge controller(s) ,
open-looped, and the remainder on a single 12kw Envy inverter.

A second inverter also increases the AC capacity, and as a result, involves
a more comprehensive review for net metering approval in Vermont (new
trigger for additional review is greater than 15 kw AC)..


-- 

*Kirk Herander / **kirkh at vermont.solar <kirkh at vermont.solar>*

*Owner|Principal, VT Solar, LLC*

*Celebrating our 33st Anniversary 1991-2024!!*

dba Vermont Solar Engineering

802.559.1225
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