Smart Solar Power Switch

I have a MOES solar power transfer switch. This device seamlessly switches power from inverter power to mains power and vice versa. The problem with this device is that it switches by detecting the battery voltage and not the actual remaining power in the battery bank. This is a problem when using high inductive loads such as the electric kettle or washing machine etc as this pulls the voltage down temporarily while the heating element is on and causes the the solar switch to switch back to grid power because it has dropped below the voltage threshold. I have a Victron smart shunt that accurately measures the real time remaining power in the battery. I’m looking for a way to use the smart shunt information and somehow bridge that gap between the smart shunt and the switching unit. Maybe a raspberry PI? If some can solve this problem it would make a perfect system.