Essentially a off grid solar power system is a solar system that is Not connected to the power grid. Lets try to explain this in a easy to understand way a off grid type solar system is one where the Solar panels absorb sunlight with photovoltaic cells, generating direct current (DC) energy at this point this energy flows through a MPPT or PWM type charge controller that monitors the state of charge of the battery system where the energy is stored until needed. the DC energy can be distributed from there to the DC loads or the energy converted into alternating current (AC) energy with the help of inverter. AC energy then can be distributed through the home’s electrical panel to power the loads in the house, cabin, RV, Boat, or what ever device you are powering. keep in mind these systems don’t have to be converted to AC power and many are not also they can be very small think Parking meter, street sign, street lighting, environmental / process monitoring device type things that are increasingly all around us everyday. They can be paired with a inverter to produce normal household type power to run your house, cabin, island retreat, A/C system, water well or other loads. The sky and your budget is the limit with these and as long as you properly maintain the system especially the battery bank they will provide you with clean free reliable electric power for many many years.