DC coupled systems use solar charge controllers (also known as solar regulators) to charge the battery system directly from a solar array. The very simple PWM type Solar controllers are a very low cost, effective way to regulate a small battery and come in many different sizes. Advantages Very high efficiency - up to 99% battery charging efficiency (using MPPT) Great low cost setup for smaller off-grid systems up to 3kW Ideal for small auto or marine systems requiring only 1 - 2 solar panels. Scalable - Additional panels and controllers can be easily added if you require more solar panels. Very efficient for running DC appliances and loads If a electricity service provider restricts the size of solar allowed to be installed (ie. 5kW max), additional solar can then be added using DC coupling.

When the utility power is unavailable or too expensive to bring in to your home or cabin, solar panels allow you to be your own utility company! no electric bill EVER!!!!