Excluding a battery from your solar system is an inefficient use of your solar panels and limits the usefulness of your solar system in general. While it is possible to use solar panels without a battery, you will get a better return on the value of the equipment if you maximize their output for your application.
Most solar controllers are not designed to work this way. Some solar controllers will simply not function at all without a voltage across their battery terminals. With others, connecting a solar panel array to the controller without a battery as a reference charge will fry the circuitry of the controller.
Most solar controllers obtain this power from the battery connected to the solar system. The power from the solar panel is too dirty to power the solar controller directly. The battery also provides a reference voltage to the controller to regulate power from the panel and distribute a portion to the battery and a portion to the load.
This fluctuating output level from a solar panel is a problem because most of our requirements for electricity require a steady flow at a constant level to be useful and prevent damage to the devices connected to the electricity source. This fluctuation in the power levels is called noise or dirty power because the output is not linear or constant.
This device must be rated to the maximum output voltage of the solar panel and then step down to your required output voltage. For example, if your panel outputs 48-volts and your device requires 12-volt power, you need a DC-to-DC converter that can accept a 48-volt input and deliver a 12-volt output.
Both the voltage and the current generated by the solar panel can vary dramatically throughout the day. The solar panel will only produce its full rated capacity when in direct sunlight. If clouds pass in front of the sun or a shadow falls across a portion of the solar panel, its output will drop.
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