No problem at all. I just did a system exactly like that. Works fine. JayOn Jun 29, 2024, at 5:49 PM, Kirk Herander via RE-wrenches wrote: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@vermont.solarOwner|Principal, VT Solar, LLCCelebrating our 33st Anniversary 1991-2024!!dba Vermont Solar Engineering802.559.1225
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