Virtual load output does not provide enough voltage to switch relay

In a small off-grid system (EasySolar 24-1600-40, 2 x 240 Ah), I would like to control a load (24 V, 10 A) via a solid-state-relay controlled by the virtual load output of the SmartSolar MPPT 100-50. The minimum voltage to switch the SSR is 3 V. Unfortunately, the virtual load output only provides 2.7 V, so that the SSR never switches.

How can I increase the voltage of the virtual load output?

Many thanks for any advice.