Is it possible to have the Deye (8kw) inverter running in off-grid mode, but still with grid connected? I know it is a Hybrid inverter, but I see on the graphs that it "follows" the grid supply and that voltage varies quite a lot. I would like to have it operate it like an Axpert type of inverter and only "switch" to grid once it is needed. Any setting that I missed that could have it operate in that way?

As a first step you could change your grid settings - hit the down-arrow and on Grid Settings pg2 you could set the parameters within which the inverter will operate and allow the grid to pass through. I've got mine set at 230V +/- 10%, in other words, between 207V and 253V. In theory that is the SA grid standard (but theory and practice mostly diverge), but the Deye will as a default allow lower voltages, I think down to 192V, up to ... something higher, I forget what.

Outside of those voltages the inverter disconnect from grid and run from solar or battery.

Beyond that there are other settings on your inverter than can achieve the "SBU" operation for you. Basically under the System Work Mode, select "Zero Export to Load,"  and under the time-of-use settings, in all time slots set the battery minimum state of charge as low as the battery's specs allow/dictate. Otherwise, if you want to approximate the "SUB" mode, set the battery's minimum desired SOC to 100%.

Unfortunately I have no idea how to avoid the blending of power that the Deye will do. You may never get it to work exactly like the Axpert, which will swap over completely to utility once solar is not enough. Unless someone else knows better.

 

Edited February 12, 20233 yr by GreenFields

2 hours ago, JacquesVDM said:

Is it possible to have the Deye (8kw) inverter running in off-grid mode, but still with grid connected? I know it is a Hybrid inverter, but I see on the graphs that it "follows" the grid supply and that voltage varies quite a lot. I would like to have it operate it like an Axpert type of inverter and only "switch" to grid once it is needed. Any setting that I missed that could have it operate in that way?

Hi! Yes, it is possible to have the DEYE 8kW inverter run in off-grid mode while still being connected to the grid. Hybrid inverters like the DEYE 8kW are designed to operate in both off-grid and grid-tied modes, and allow you to switch between the two modes as desired.

To have the DEYE 8kW inverter operate like an Axpert type of inverter, you need to set the inverter to "standalone" or "off-grid" mode, which will prevent it from following the grid voltage and instead allow it to function as an independent power source. In this mode, the inverter will charge the batteries using its own internal charger, and will use the stored energy in the batteries to power the load. The inverter will switch to grid power only when the batteries are depleted and need to be recharged.

To switch to off-grid mode, you can refer to the user manual of the DEYE 8kW inverter, which should have instructions on how to change the operating mode.

Hi, Have you been able to swicth to off grid mode?