I just listed on the for sale page a couple dump loads, for wind or hydro, I no longer need that may be of interest to some here. I recently added some more solar, and along with my 900 watts of hydro power, all grid tied, when the grid goes down I needed a bit more dump capacity. I use an Outback 3600 watt VFXR (I think it is...) battery based grid tie inverter, which means I can add misc solar power to augment the hydro, it all goes into two small 12 volt batteries (in series) and anything over 25.6 goes into the grid, 24/7. The hydro has no controller, none required, the inverter shunts the power into the grid as fast as it arrives. I do have dual MorningStar charge controllers though they are set up to act as diversion control: when the grid goes down and the battery voltage climbs, they shunt power to the larger dump loads I now have.