We have a customer, grid-tie, but with constant power cuts.
Currently he has a grid-tie 1.5kW (pump as turbine) water turbine, with a ABB wind interface 4.0 and a old fronius with fixed MPPT voltage setting (but he can buy a new Primo), and a dump load connected to the wind interface.
Works perfectly, but because of the power cuts, he wants to add solar, and go with a Quattro 10kVA + Pylontech battery bank ESS setup. Ideally he wants to install the hydro setup on the ACout side of the Quattro, to be able to charge in case of a power cut, but not sure how well a fixed DC voltage Fronius will cope with Frequency shift.
Can anyone help with this? Is it safe to do this?