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Q/A
  • What type of batteries are best for solar power?

    Deep cycle batteries are the recommended batteries to use in solar installations. There are a range of different deep cycle batteries, including flooded lead acid, sealed lead acid, and lithium iron batteries. Flooded lead acid batteries are the most inexpensive option and are available at most big-box and auto stores. They are also the most high maintenance. Sealed lead acid batteries store 10 to 15 percent more energy than lead acid batteries and charge up to four times faster. Lithium iron batteries are the most expensive options, but also last four times longer than lead-acid batteries, weigh much less, and require minimal maintenance. Deep cycle batteries are also available in a variety of voltage battery (12v, 24v, 48v).

  • Can I wire different battery types and sizes together?

    We recommend wiring batteries of the same type and amp hour rating in your solar installation, i.e. if you go with absorbed glass mat batteries, all the batteries in your solar battery bank should be AGM batteries. This will limit any efficiency loss due to having different batteries.

  • How long does it take to charge a 12v 100ah battery?

    Sunlight, temperature, and battery type will influence specific charging times. To get a general idea, you’ll need to calculate amps delivered from your solar panels (total wattage/voltage of your battery). Then you’ll divide the amp hours of your solar battery by amps delivered. For example, if you have a 100ah 12v battery with three 100 watt solar panels, your system would deliver 25 amps. By dividing 100Ah by 25 amps, you’ll learn it will take four hours for a 300 watt solar panel system to charge a 12v 100ah battery.

  • What is a deep cycle battery?

    A deep-cycle battery is a battery designed to be regularly deeply discharged using most of its capacity. In contrast to car batteries which only provide short bursts of energy, deep cycle batteries are designed to provide sustained period over a longer period of time. The mainstream battery types in solar battery backup systems include Flooded Lead Acid (FLA) batteries, Gel Cell batteries, Absorbed Glass Mat (AGM) batteries and lithium batteries. Depending on the voltage, deep cycle batteries are divided into 12v battery, 24v battery, and 48v battery. The most common deep cycle RV battery and marine deep cycle batteries are 12V, and the deep cycle golf cart batteries are normally 24V or 48V.

  • How to charge a deep cycle battery?

    A charge controller is an essential piece of equipment for all solar battery storage systems. The right charger will help your battery charge faster. For example, ionic lithium batteries can take a higher current, and they charge much faster than other types only when paired with the correct charger. Charge controller can also prevent the battery from charging over 100%. Once the battery is nearing full charge, the controller slows the amount of electricity flowing to the battery. When the batteries aren’t otherwise being used, the charge controller can “float” charge the battery for solar systems, or continuously top off the charge to prevent the battery from dying. Charge controllers come in different amp sizes and power tracking technologies, like PWM (Pulse Width Modulation) or MPPT (Maximum Power Point Tracking). You can find all types of top-ranking charge controllers at Renogy.

    PWM Controllers: PWM charge controllers feature Pulse Width Modulation charging technology. PWM controllers are more basic in the sense that they drop the voltage coming from the solar panel(s) to the batteries. This drop in voltage equates to a loss in wattage, which results in 75-80% charging efficiency.

    MPPT Controllers: MPPT controllers feature Maximum Power Point Tracking Technology. MPPT technology “finds” the maximum operating point for the panels’ current and voltage under any given condition. With this method, MPPT controllers are actually 94-99% efficient. This higher efficiency can help increase the life of the battery or battery bank you are using.

  • How long do deep cycle batteries last?

    The lifespan of a deep cycle battery varies by battery types. Normally, AGM batteries lasts about 4-7 years; Gel batteries lasts about 2-5 years; Flooded Lead Acid batteries lasts 4-8 years, and a high quality Lithium battery can last more than 10 years. The lifespan of a deep cycle battery also effected by battery cycles, maintenance, and the environment in which the battery is kept. For example, a Lead-acid battery’s cycle life can range from 500 to 1200, and a lithium battery can range from 2000 to more than 5000. Besides, a battery kept in a hot environment will experience a shorter lifespan than that in a cooler environment. The lifespan of marine batteries, RV batteries and boat batteries also depends on its usage scenario.

  • How to tell if a deep cycle battery is bad?

    The symptoms of a bad deep cycle battery show when the battery fails to maintain a charge, or shows sluggish performance, or has shorter run times. Or you can tell your battery is bad by finding things like a damaged terminal, bulge or bump in the case, crack or rupture of the plastic, excessive leaking, or discoloration. Terminals that are broken or loose might can cause a short circuit. When a battery short circuits, all the power is unloaded instantly, generating a lot of heat and can potentially cause the battery to explode. Also, cracks, splits, and holes may not cause a battery to stop working, but the battery should be labeled unsafe for safety reasons. If a physical check reveals nothing, try measuring the battery voltage. Make sure it is fully charged before carrying out a voltage check on it, and give it to rest for 3-5 hours. You can use a multimeter to measure your batter’s electrical value. As a well-functioning 12V deep cycle battery is fully charged, its voltage should range from 12.7V to 13.2V. If the voltage reading shows 0, it indicates a short circuit and a dead battery. If the voltage is below 10.5 volts, your battery has to be replaced. If the test reads 12.4 volts or less, but your charger indicates a fully charged battery, it means the 12 volt deep cycle battery is sulfated and will require replacement.

  • What are deep cycle batteries used for?

    Renogy provides deep cycle batteries for solar systems that can meet various scenarios. Add the stable, long-lasting, and compact deep cycle RV batteries to your camper, keep your adventure empowered and stay comfortable and safe on your journey. Upgrading your boat to the reliable Renogy deep cycle boat batteries, enjoy more energy but only at a fraction of the weight of a traditional lead-acid battery. Enjoy more fun of being on the water, no need to worry about your deep cycle marine batteries running low after a long day of use. Renogy also provides the 24v battery and 48v deep cycle battery. Use the 48 volt golf cart batteries to increase your cart’s range, top speed, and acceleration, while saving space and weight.