Granted, there are exceptions to these averages, but erring on the side of caution creates a more reliable solar system. Typically we see an average of 4 hours of usable sunlight in the winter, and 6 hours of usable sunlight in summer.
You should always err on the side of caution and over-estimate your power needs.
Then figure the amount of direct sunlight the solar panel will receive in that time period and come up with a total amount of watt hours needed. First, determine your total electrical consumption in that time period. Since there are 24 hours in a day, we suggest you use that as a baseline. This figure could be measured in hours or days. Before you can even get started when purchasing a panel, you need to know how many amp hours or watts you’ll need to produce in a set period of time. The first thing to remember about solar power is that it is all a matter of numbers. This is a very popular panel for maintaining single and dual batteries for stand-by and storage applications. As an example, the Pulse Tech SP-7 panel can output. As a rule of thumb, a rating of 15 watts delivers about 3,600 coulombs (1 AH) per hour of direct sunlight. Solar panel manufacturers rate solar output in watts. That means a solar charge controller such as the Morning Star SS6L, 6-amp controller will work with nearly every panel we sell, right up to about 70 watts. Something to be aware of when selecting a controller is that they are typically rated in amps, while photovoltaic panels are typically rated in watts. In a nutshell, a solar charge controller acts like an on and off switch, allowing power to pass when the battery needs it and cutting it off when the battery is fully charged. In most cases where a 6-watt or larger solar panel is installed, the use of a charger controller is highly recommended. Some solar panels are made with blocking diodes pre-installed that prevent battery discharge during low or no-light conditions. Actually, a charge controller is a good idea in a majority of applications, as it can provide several benefits such as preventing overcharge, improving charge quality, and preventing battery discharge in low or no-light conditions. CONTROLLERSĪnytime you use a panel that is over 5 watts rated output, we recommend using a solar charge controller. Typically, when 24 volts or greater is needed, solar panels may be wired in series, or we can special order solar panels that are made to deliver more DC Volts such as 24V, 36V, 48V etc. Most solar chargers are designed for 12 VDC, but we do have limited availability on a 24-volt panel. Conditions such as an overcast sky, shadows, improper mounting angle, equatorial direction or short winter days will reduce the actual solar panel output to below the rated values. Using this example, you can see that it will take at least 100 watts of solar power to recharge a 100-amp hour battery in a few days.Īlso, keep in mind that it takes direct sunshine on the surface of the panel to produce the maximum-rated power of a solar panel.
#Small 12 volt deep cycle battery full#
After a full week, the battery will be just about fully charged. Assume you take a discharged 100-amp hour battery and charge it with a 30-watt solar panel under ideal summertime light conditions. For example, some people are trying to recharge batteries for a trolling motor, boat, RV, house, electric scooter, backwoods cabin, etc., and they want it done in very short time, usually in just a few days.
We’ll attempt to answer the questions asked most often so we can save you a phone call.īefore we get started, you should know that solar power is not the cure-all for replacing spent energy. Rain or shine we get a huge number of calls about solar power each day.
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