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Solar panels come in all shapes and sizes, from 5 Watt panels suited for off-grid applications to 300 Watt panels for home installs. Availability shifts rapidly, so panel choice is as much determined by what is in production as it is by cost per watt.
Solar panels produce Direct Current (DC), but most homes use the more efficient Alternating Current (AC). In order to power common household items with solar or tie into the utility grid, an inverter is necessary to convert from DC to AC current.
This popular off-grid solution extends battery life by adjusting the voltage of incoming current to match the optimal voltage of the batteries. As a battery reaches a higher level of charge, this optimal voltage shifts and the charge controller adjusts output accordingly.
