Our grid voltage is around 249 volt and variable throughout the day. When the multiplus delivers about 2500 watt to the grid, the grid voltage is around 252 to 253 volt. When pushing more, around 3000 to 3500 watt the grid voltage rises to 255 volt and the Multiplus disconnects from the grid, waits a few moments, reconnects and around 3000 to 3500 watt it disconnects again.
Can’t the multiplus just hoover around 252 volt by regulating the feed in current?
Or can I set and regulate the maximum grid feed in wattage by using nodered?
The transformer of the utility company is set to high voltage to limit current coming from the neighborhood they told me. This is done because at sunny moments the transformer of the utility company was overloaded. Now the solar inverters switch off when pushing to much. According to their planning it will be over more than 11 years before the transformer will be replaced unfortunately.
Wire is 6mm2 12 meters, grid code is set to the Netherlands, I don’t know the code at this moment, have to look it up. But 253 volts is the maximum voltage allowed in the Netherlands.
You can try that, but you have no control of grid voltage what so ever, you can lower your feed in (also in ESS menu) but at the same time some one else’s inverter will keep feeding in instead of shutting down…
Lowering the feed in in the ess menu works, but I want to set it dynamically via nodered or mqtt. I had a look at the dbus paths but I can’t find the path for setting the maximum grid feed in for ess.
Actually, in veconfig there is an option called P(U) response in the European grid code settings.
I’ve set this setting to drop the inverter power at a specified voltage from 100% power at 109,5% (251,85 volt) of the nominal grid voltage which down to 20% power power at 110% (253 volt) of the nominal grid voltage.
This exactly the functionality I was searching for. And the unit still works according to the grid code of my country.
True, but this option helps for the whole house because the total power fed in drops and lowers the voltage, but it can’t pevent overvoltage if other devices are feeding in also.
Optimal the other devices should do the same, lower feed in when voltage rises to prevent a full stop due to overvoltage.
But if the sun shines the victron will mostly charge the battery that helps lowering the grid voltage, because in most cases the grid voltage will be high when there is much pv power and the prices are probably low.
Of course there will be situations that the victron will feed in together with the solar panels, but that will be not very often.
At my house we have the disadvantage that the grid voltage is always very high, I sometimes see 249 volt even during the night. So also feeding in at night causes overvoltage sometimes and with this algorithm in place the victron doesn’t have to disconnect due to overvoltage.
Only problem I will possible face is that the ramp from 100 to 20% is to steep, but I will monitor that and make the ramp less steep if needed.
