demille

In island operation the in series inverter creating the island can be connected to the available distribution network ( grid port, utility) Parallel inverters used in an island are coupled with the grid port to the output of a main off grid inverter or a main power generator., not to the grid. A coupled parallel inverter may not be able to increase system island voltage which means it is able to pwr to the loads and must be able to reduce its output to prevent voltage build up ( in an attempt to sell back surplus pwr). Most parallel solar inverters have the ability to connect a CT and hace active pwr control available. it may depend on the way the inverter uses this information. and how sensitive the censor is to be suitable for to be used in an island. And this information is often not available. In my country ( Belgium) most home installation are single phase 40A. Installing solar panels the system is limited by law to 5KW on-grid use. This is not enough for charging an EV using solar pwr. A solution is to install a 5kw hybrid connected to the grid. The back up output can be used to install the extra solar pwr needed by creating a private island. For this one can use normal solar on-grid inverters . The DEYE hybrid has a setting "ac coupled on load site". it probably must be selected if an on-grid inverter is connected to the load port. I don't know what this setting does exactly, but maybe someone out there knows.

DEYE Hybrid SUN 5K P1- EU has: 1.Selling first 2, Zero export to load: The build in CT will detect pwr flowing back to the grid ( manual) 3.Zero export to CT. The hybrid inverter will NOT sell pwr to the grid ( manual) 4, Solar sell: specified, if 2 or 3 are active. 5 max sell pwr: working mode is not specified 6. Max export power: for zero export mode ( 2 and 3 ?)It tells the grid output pwr. To ensure the hybrid inverter won't feed power to grid ( manual) 7. Grid peak shaving: working mode is not specified How does this work? 1 is obvious; 2 This is manged with internal CT , managing the Grid port of the inverter, not grid to home. If it is based on current flowing back to the grid it does NOT prevent some pwr is injected; 3 This is managed using an external CT and the position where it is placed is therefore most important. One can use it for other things as exporting to GRID for example to divide connected non essential load into grid powered only and grid + inverter. Depending on where the CT is placed it can or can not be used to limit or manage load injection into the grid, manage grid to home. The external CT will detect pwr flowing back to grid ( manual). This way injection into the grid is NOT prevented. 4. Solar sell: how this works? If it is active during 2 it must be managed by an internal CT, an external CT is not needed;. When it is active during 3 does it use the external CT? 5. Sets the max output flow into grid. Where it is measured? Internal CT in mode 1, 2 and 3 ( grid port inverter) or by the external C/T if 3 is selected?. 6. The name insinuates that the export is limited and not the import. Inverter or Grid? If this setting is active in both zero export modes how it is managed? . Default setting is 20W. If only an internal CT is used I assume this must prevent the inverter to export using its grid port to pwr non essential load. What is the difference using mode 2 only? And how this works in mode 3? if the external CT is used and the default setting is 20W this assumes always min 20W has to flow from grid towards loads otherwise there is little difference with mod 3 only. In this case one can use the setting to maximize export to grid ( max export power setting? ) ; if a set value is allowed to flow from inverter to grid it does not what is intended written in the manual. How it will ensure the hybrid inverter won't export power to grid, according to the manual the main reason to use this setting? 7. Grid pwr is limited to set value. If the load ( back up + home or back up only?) exceeds the allowed value it will take PV and batt pwr as supplement.( also for non essential load if in mode 3?) If requirements are still not met more grid pwr is used. Is this active in all modes? Does it use an internal CT in MOD 2 and 1 and the external CT in MOD 3? This assumes if the setting is activated always grid pwr is used till the set point. if it is managed by internal CT only and an external CT is NOT needed the setting does NOT include non essential load and NOT at all does shave the total grid power and non essential load is not able to use PV and BATT power even in mode 1 and 3. Setting can be used to prevent inverter pwr is injected into the grid, for example if set to 100W. How this is used in combination with 6 ? One may say the use of most settings and the combination is not very well explained in the manual. In countries where one has to pay an utility user fee based on the total installed pwr if some current is injected into the grid it is important to know how this works exactly. If used in Island operation injection into the grid is not possible and management based on power flowing back to the grid can not work!

I am planning using a DEYE hybrid SUN 5K P1 -EU. I may not and can not inject pwr into the grid. To avoid this and the inverter being able to supply all loads via the grid port I think I must use the CT and selected zero export to CT. But how does this work? Is the inverter reducing pwr when it senses pwr is flowing in the opposite direction of the arrow ( placed towards inverter) or does it manages pwr based on a minimal amount of pwr must be able to flow towards the inverter ( positive flow). I assume The first option does not prevent the inverter trying to injected into the grid by increasing working voltage, the second option solar and batt pwr is prevented to flow towards the grid, no pwr is injected and voltage stays balanced. For me it is important to know how the DEYE manages this as I may not and can not inject inverter pwr into the grid. The DEYE also has a setting Zero-export power which can be set for zero export . Is this for zero export to load or for zero export to ct or both? And the same question, how it works, base on positive current or negative current ? the shown default setting of 20 is positive; if it is suitable for both zero export modes this must be managed using an internal CT. or does the DEYE combines both if a CT is installed? I want to be able to use solar and batt pwr for all loads. Is this possible based only on the selection zero export to CT or must I use time off use in System Work Mode to allow the battery to pwr normal load? I am planning to use the inverter in an existing off grid installation which means it can not inject pwr into the grid but must avoid it tries to do so. I suspect other wise the inverter parallel side ( grid port) will constantly increase the bus voltage in an attempt to overcome normal system voltage. Also I plan to connect EV V2L on the GEN port. thanks in advance for the information