The solar electric systems associated with the term “solar” are usually simple grid-tied system, with PV modules and inverter charger for converting DC to AC for running loads. They save their owners money by offsetting utility bills or sell back power to the utility. That's it.
But much of the world can not connected to a grid, or even nowhere near one. In these situations all electricity has to be generated on-site. These sites can range from remote communities, resorts, farms and national park facilities, security installations, marine platforms, remote highway lighting, weather stations, and much more.
In these applications, the main reason to “go solar” is not so much going green as it is saving green—in this case saving the dollars it might take to connect a remote location to a grid. Under the best circumstances with minimal terrain considerations it can cost a minimum of $25,000 just to run a mile of transmission line for a single home in the developed world—and in less developed places with multiple users or greater energy needs, and with mountains, rivers or forests to contend with, the cost increase may be hundreds of times that often prohibitive. So are generators, which require expensive maintenance, constant fueling and produce round-the-clock noise and emissions. Often in these situations solar is not just the cleanest choice—it may be the only one choice.
Anywhere there's no grid, solar electricity generated on-site must be stored for use when the sun isn't shining. That's where PowMr solar controllers come in. The
is the core of a solar electric system relying on batteries to operate. The solar charge controller ensures that the batteries are neither overcharge or over discharge, or drained too deeply or operated in extreme temperatures, since all those conditions can dramatically shorten their life. The solar charge controller also controls loads, such as lighting systems connected to solar modules and batteries, for timely operation. If there's an inverter charger in the system as the controller partners, it to ensure optimum battery charging.
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