The main features to be checked when choosing a controller for a stand-alone system are:
| - | The technology: direct coupling, or including a power converter (MPPT or fixed DC input) |
| - | The battery pack voltage (many controllers have switchable - or even automatic - battery voltages). |
| - | The Maximum PV current, or Load Current, |
| - | With power converters, the nominal power, |
| - | The ability of managing a Genset |