Question 3 x 18Kpv setup questions

Posted by: @tallbill

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I am assuming for self-consumption at night, the battery will discharge until ON-Grid Cut-Off.  At that point, the grid will power 100% of the load.  If I set the Start AC Charge to less than ON-Grid Cut-Off, the system will go the rest of the night on grid (no charging). When the sun comes up and there is excess PV power, the batteries will finally start to charge. Correct?

That is correct.

Posted by: @tallbill

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When the grid fails and the battery SOC wants the generator, I would want the load to be powered by solar then generator.  All excess generator power should go to the battery.  I see how you can set a generator charge amperage, but I would want a floating value (all excess power).  How do you configure that.  If I just set a fixed generator charging amps, the generator will run too long if the load is light, or possibly overload the generator if the load is heavy.  I see a field to enter generator power, is there a CT on the generator input so it can monitor generator consumption? Would this allow setting a high charging amps and it uses the generator power setting to limit the battery charge?

When the generator is active, loads will take priority, and all excess power will go to charging the battery bank. The charging amperage is the max that the inverter will pull from the generator with the excess power and once the stop SOC is reached, the inverter would go back to self-consumption mode and send a signal to turn off the generator. I would recommend having the gen boost setting enabled to have excess PV assist with load demand when needed.

Posted by: @tallbill

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If I ever do want the grid to charge the batteries, I have a similar question to the generator.  I would want all excess power to go to the batteries. Do you use the peak shaving (with no time limit) to limit the total grid draw to not exceed my grid breaker?

In this setup, you should avoid enabling the peak shaving setting. Instead, configure the AC charge power limit along with the desired start and end state of charge (SOC). Depending on the selected working mode—either PVCharge+GridOn or PVCharge+GridOff—the AC will bypass directly to the loads during AC charging. In PVCharge+GridOff mode, when AC charge is enabled PV power will support battery charging, while in PVCharge+GridOn mode, both PV and AC power will charge the batteries, with any surplus PV power helping to supply the loads.

Posted by: @tallbill

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What is the difference in the spec between Transfer time (configurable) and Switching time?

Transfer time refers to how long the inverter takes to switch between power sources; while switching time is the duration it takes for the inverter to transition from On-Grid to Off-Grid mode. The transfer time can be adjusted using the seamless switching setting: enabling it reduces the transfer time to 10ms; while disabling it leaves it at 20ms.

Posted by: @tallbill

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If the grid fails at night, while batteries were at ON-Grid Cut-Off will the inverter start up within 10ms if the OFF-Grid Cut-Off allows?

That is correct.

Posted by: @tallbill

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Just out of curiosity, when you parallel 3 inverters, do you put the total amperage in configuration fields, or do you divide all values by 3?

The values would be divided between the three. For example, if you have a battery bank capable of discharging at 600A, you will have the discharge current limit set to 200A per inverter.