2 kW continuous is a serious number. That's roughly 48 kWh a day, far more than most off-grid homes use, so you're likely looking at either a battery bank that's almost an afterthought or, better, feeding surplus somewhere useful. The one thing I'd poke at: continuous is a strong word for hydro. Turbines hit their rated output at a specific head and flow, and both move with the seasons. In a French winter your stream runs high, in a dry August it can drop to a trickle, and output falls with it. So the real question isn't the nameplate number, it's your minimum flow during the driest month, because that's what you actually get to depend on. If August gives you 400 W, you sized for February and live with summer. What head and flow did you land on?