Why are hybrid inverters so much heavier than off grid inverters?

[1201]

Comparing high frequency hybrid inverters vs high frequency off grid inverters, a 6-10kw off grid inverter is about 40-50lbs but the same 6-10kw hybrid inverter is 90-110lbs.

Why exactly?

 

[profesor79]

One need add weight that comes with charging regulator. All is about heat and in fact heat dissipation.
So additional voltage management require a circuit that will lower it from charging sources (PV, mains) and boost it to provide mains output.