This multifunctional inverter/charger, with an external current sensor option, extends the PowerControl and PowerAssist function. The MultiPlus-ll compensates for insufficient grid power with energy from the battery. When the load reduces, the spare power is used to recharge the battery.
Victron Energy recently expanded their Multiplus-II series, which includes 8 kVA and 10 kVA.
Victron Energy: https://www.victronenergy.com/inverters-chargers/multiplus-ii