Jean-Claude Malengret

There is definitely a Deye RS485 issue. The ports just randomly die. Got hold of China support and they told us to use the "meter" port. I suspect they broke something in a firmware update. Took us days of tripple checking our side at a huge site until we finally got some support that tentatively admitted they have a problem their side.

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A grid distrubance such as a high low voltage condition or a freq shift would kick the inverter off the grid and onto the batteries. This would be the case for a passive offline or grid interactive inverter. How can taking a load off make it more unstable. Maybe in a high voltage condition the voltage could go higher? But in that case you should ban any disconnect device that protects equipement.

I think "battery assist" which the guy said in the video is going to be the new term for the grid. The direction the municipality have taken is going to turn their higest revenue income into a backup generator. If they were more accomodating they could be selling 1 customers PV injection to their neighbour at a huge profit with no expense. Intread the entire grid will be reduced to a battery charger. Considering the same people who can afford to go "grid assist" are the same people who are subsidising the grid, its a financial disaster for COCT.

(1) Yes, we are adding a software limit setpoint. In the case of the Powerstar (hybrid inverter) it will limit the source, not the load. I can see no reason why the load needs to be limited if the source is limited. The batteries take the difference. In the case of a passive offline (UPS) type inverter the software limit on the source would automatically mean the load output would also be limited while connected to the grid. This is a problem as no one wants to pay for a 6kW Oasis inverter that can only deliver 6kW when offgrid and 3.5kW when ongrid. The additional output would be redundant. If a customer can only put 3.5kW of his load on the inverter he will likely find the excercise futile and not do it at all. (2) Yes, if your solar array is less than 3.5kW then magically everything is ok again. The UPS you bought is legal until you put solar on your roof. Even if your UPS has nothing to do with the solar generation. There seems to be a conflation between grid tie inverters and battery based inverters. COTC does not seem to grasp how different these devices are. As I was saying earlier. We are busy designing a 3.5kW CAN based battery charger that can integrate on the CAN base with other CAN devices. A number of our distributors are calling for this as their customers are all now pivoting to an offgrid topology with the utility being a batttery assist via the 3.5kW battery charger. I'm doing this at my house. This way I dont need to worry about COCT moving the goal posts again and again. I'm essentially offgrid and the grid is my 3.5kW geni backup.

Yes. We sell 1000s of inverters in the 4-30kW range for residential and this unique interpretation of NRS097 is unsettling our distirbutors and causing confusion even among the academics in the power electronics community. I have requested a meeting with Ryno and 2 Professors who were involved in the NRS097 drafts. Professor Gaunt and Professor Malengret. Hopefully they can bring some clarity to the reasoning behind their interpretation.

The 25% limit on inverters is untenable. If they insist on this our customers will just go off grid and use a 3.5kW battery charger. The grid will essentially become a backup generator for battery low conditions. I've asked my engineers to design a 3.5kW battery charger with CAN so that it can communicate with SolarMD, FreedomWon, BlueNova, Pylon and other populat brands. It will also integrate with the existing CAN based MLT Inverter ecosystem so that the battery charger will be controllable from the inverter.