Technical Support

I have a SUNSYNK 3.6KW HYBRID INVERTER and 5.12 kWh SUNSYNKL CATL BATTERY with 3.6 kWp of solar PV recently installed on my house in the UK.

My question is on optimising the settings of the inverter to do just one thing:- minimise draw of power from the grid.

With the good summer days in the UK at the moment the battery is charging to 100% but about 10 am (starting from sunrise at about 5.30 - 6 am) and from then on exports to the grid. While charging in the morning it will still be drawing a small amount of power from the grid (50-60 kW) when it seems like it could afford to export that small amount rather than import while still comfortablly getting to 100% charge over the day and handling the load from what the PV is making. So is there some way to avoid that import while battery is < 100% when still early in the day?

Second, when the sun has gone for the evening it will run off battery power plus grid through the night. I guess the ideal would be to draw as much battery power over grid until it hits 20% (seems like it is not stable to allow the battery to go below 20% SOC?) before the sun comes up and takes over the load (i.e. it is not efficient to be drawing grid during the night if battery is still above 20% SOC). Is there a setting in the inverter to tell it to make sure it discharges the battery (to 20% SOC?) before taking any grid?

Lastly, this is all normal load type conditions so far. During peak load, such as cooking or kettles, how do I make sure the load is taken from battery (or battery + PV) and not any grid - particularly during the day when the battery will get a chance to recharge again? I tried using the Peak Shaving tick box which allows a minimum value of 1000 W and it would certainly work to take no more than 1 kW from the grid during peaks but it worked to take the FIRST 1 kW from the grid and then the balance from battery (i.e. if the load was 1.5 kW it would take 1 kW grid and only 0.5 kW battery, which doesnt seem optimium when the battery could probably do the whole 1.5 kW).

I attach photos of my setup screens. Happy to share more if it helps.

Tom