Grid tie inverters to boost genset or PSW inverter output?

There is a company, the names that come to mind (Foggy) are Victron and Victor, that makes a "Boost" for use with generators, This is a battery/inverter system and it's much like the inverter in the Honda EU-2000i's.. It monitors power usage and when it senses an increase in load it kicks in to "Boost" what the generator can supply.... Then it drops out and when it senses that the generator has the additional capacity recharges it's battery till the next cycle.

As I said the memory is foggy and I did not bookmark it.