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But it still means that there will be minimal clipping if you have enough battery storage. The reason the numbers didn't add up is because it was clipping at 3.6 total before the firmware update. With the firmware update you have an MPPT of 7.2 with 3.6 available for AC.

I'm emailing Sunsynk right now to let them know that their inverter efficiency is actually only 87% and not the 98% they claim. They will need to update their spec sheets.

Go read up on MPPT before you dismiss what I am saying. There are apparently multiple strategies used to optimise power output but they all require the system to know what the panels are doing without applying full load. https://en.wikipedia.org/wiki/Maximum_power_point_tracking

My point was that it's possible for the inverter to know that the PV is currently capable of generating 4kW without actually using it as this is exactly what MPPT does. It doesn't have to go somewhere if it isn't actually being generated.

Presumably that would be with a fully charged battery though?

Are you sure that it is only doing 3.6 though?

He also mentions it in this video -

But in OP's screenshot you can see that he is charging the batteries at 5.2kW after the firmware update.

In the first image there is power clipping due to the battery being full. So the PV generates 4.03kW and the inverter supplies 3.6 AC to grid and load. The other 400W is clipped but if the battery wasn't full then it would be using the full 4.03kW. Remember that the inverter is rated for...

But what about this? Basically, clipping will only happen now once the batteries are full.

Regularly hitting 5kW+ now with the Sunsynk ECCO 3.6kWh inverter and 6.9kW array. I had to get Sunsynk to update my firmware to 2.3.8.4 though, it wouldn't go over 3.6 without it. You can see in the chart below that once the battery is fully charged(11:45) then I get clipping on anything over...

My point is that the inverter has an MPPT of 7kW and it can tell what the potential output of the PV is without using the full load. It's not a massive stretch to assume that they could display that potential power output on the screen even if it is only using half of it. The alternative is...

As I said earlier, just by looking at the voltage you can calculate what the potential output of the PV is. You don't need to be drawing 4kW to measure 4kW.

Okay, you are correct then. The inverter is just losing >400W. Happy?

I think it's very unlikely to be a measurement error if it is measuring the way you say it does. And even if the losses are only half of that, it's a lot for a unit that doesn't even have a fan and has a claimed maximum efficiency of 97.6%.

I noticed that the Plant ID changed in the new region so if you've got it hard coded you'll need to change that too.

You've completely ignored the bit that says "The current from the array can be expressed as a function of the voltage". A lot of clever people here all willing to accept that the inverter is soaking up >400W continuously. Quite impressive for a unit without a fan.

They are not system losses, it is clipping. The inverter can only produce 3.6kW AC. If it has 4kW of DC coming from the PV there will be 400W left over that could go to the battery if it wasn't full. But it is full so it's clipped.

Yes, this is exactly what I had to do. There is also a setting under Plant Info for the installed capacity.

But that's exactly what MPPT does. It samples output and applies the required resistance to extract most power from PV. Presumably it does this by checking the voltage from each string and making some assumptions. So it's possible for it to only use 3.6kW but know that 4.03kW are potentially...