Lets assume my motor is the Endura 30 mentioned above, and I troll at speed 2, which is 10 amps draw. To be able to supply 500 Watt equipment from 12 Volt deep cycle battery, you will need a battery bank with total capacity of 833.40AH (or 8 x 100AH batteries) With a direct-current connection (no inverter), a car battery can power a 2.5-amp CPAP for 7.34 hours or a 5-amp CPAP for 3.2 hours and still be able to start the car. Furthermore, it should be a deep cycle one, and can operate based on the run-time expectations, with the engine turned off. Lead acid batteries can get damaged if you charge them in … Cranking batteries can’t be discharged more than about 25% before their lifespan is depleted. This charge may be from the vehicle's alternator, a portable generator, or an appropriately sized solar panel. Unfortunately, that was not my experience last year. N.R. For a 12-Volt battery: 100 Amps DC x 3 hours = 300 A.H. For a 24-Volt battery: 50 Amps DC x 3 hours = 150 A.H. Now, the proper type and amount of batteries must be selected. Using the inverter calculator, indicates ~14.35 Amps DC load and then running the sizing calculator suggests that I need battery capacity of 306 AH 20 hrs. Refurbishing and caring for your deep-cycle battery (the type used in marine vehicles and RVs) keeps it working longer. Your typical deep cycle battery, however, is designed to store energy and deliver it at lower amperages for longer periods of time. If you don't have the user manuals, most companies offer the information online. A Deep Cycle Battery can provide a surge when needed, but nothing like the surge a car battery can. If a device specification does not include amps but does include watts, the formula you need is: A battery bank designed to power an average American household for three days would need to supply 90 kilowatt-hours of energy. There’s four different technologies you can choose from. On an average, a RV battery lasts around 4-5 years. If you use it for 5 mins a day, it could last 120 days. For example, for a motor that pulls 20 amps at medium speed using a 100 amp hour battery, the run time would be: 100 amp hour rated battery / 20 amp draw = 5 hour run time The nomenclature of deep cycle batteries comes from the fact that they are designed to be discharged as fully as possible each time they are used, a “deep-cycle” of the battery. There’s the lead-acid battery, gel batteries, AGM batteries (Absorbed Glass Mat), and lithium batteries. Deep-cycle batteries are generally rated at a 20-hour rate, or how many amps per hour can be given for 20 hours until the battery is dead. The most important things are keeping the battery charged and its electrolytes at their highest recommended level. Doing so will shorten the life of the battery based on most … In a high-vibration commercial application, a typical flooded battery may only last a few weeks, where an OPTIMA AGM battery could last several months. You can see in the example above for a Trojan T-105-RE 6V deep cycle battery, they rate the battery C-20 rate at 225Ah. 0.8 HRS. As mentioned above, your RV coach has two separate battery systems, a 12-volt DC system and a 120-volt AC system. Used correctly, deep cycle batteries can provide 200 … If your battery is rated at 200 amperage hours and the draw of the motor is 25 amps, you may have 8 hours of consistent use.You simply divide the total amperage hours by the draw of the motor. Tip: Engine start batteries should not be discharged below 90% charged state, and marine deep cycle batteries should not be discharged below 50% charged state. Batteries designed and warrantied for deep-cycle use (like the OPTIMA D34M, D27M or D31M) will last longer than starting batteries that are not designed or warrantied for deep-cycle use. Deep-cycle batteries begin to decline after around one thousand cycles of charging. Okay so the setup is- Paj 2005 3.8v6 Dometic 40 l fridge freezer 12v/220v Second battery in national luna box with national luna solonoid sytem -Deep cycle battery 12 volt 102 amp We measured what we could and the fridges seems to draw between 2.5 amp and 3 amps per hour. However, AGM technology can prevent a leak from developing, which can increase the lifespan of our products. Instead, most professionals opt for two separate batteries. Tip: Deep cycle (marine) batteries generally have the highest reserve ratings. last as Deep Cycle batteries don’t like being overloaded for long periods. Traction batteries, (also called deep cycle or golf cart type), should be used in order to be able to handle the repeated discharge/charge cycles that are required. Deep cycle batteries, on the other hand, produce a smaller amount of energy but are able to do so for a very long period of time. If you need help finding the right AGM battery for your vehicle, click here . They also don’t last as long as a deep-cycle battery. A 50 amp-hour equivalent car battery should be able to power a 2.5-amp CPAP for 6 hours and a 5-amp CPAP for 2.63 hours with an inverter. How to Maintain Deep Cycle Battery (5 Maintaining Tips) The life span of the battery mainly depends on usage-normally 6 to 48 months. Indeed, a typical cycle for a deep cycle battery would start at 100% capacity, followed by discharge of the battery to between 20 and 50% of its original capacity, and then recharge back to 100%. In order to approximate how long a certain motor will run on the water, you simply take the battery's amp hour rating and divide it by the amperage draw. The 4 Boat Battery Technology Types. An automotive one may only take you so far but a well-maintained marine battery will probably last you 4-5 years from new. Most deep-cycle batteries need an amount of discharge and recharge cycles to perform at the peak of their operation. It is because there are so many factors that determine the life of a rv Battery. Like any other piece of equipment, the more you hammer it, the less it will last you and one of the key strategies for getting the longest life out of your deep cycle battery relates to depth of discharge; i.e, how much juice you suck out of it. Buying a dedicated marine battery is essential. I had my deep cycle connected to my pickup with a switch so the pickup battery was not connected when I was charging the deep cycle. Lithium ion batteries may last for as many as 5,000 charge cycles, whereas deep-cycle batteries may only last for 400 or 500. Giant Deep Cycle Batteries can be almost fully recharged (97% or better) even after 30 days of being totally discharged. And you amazed why? So in theory the battery when full should sustain the fridge 102/2=51 then 50/2.5=20 hours ? A AGM battery if used properly can last 4-8 years where as a gelled or golf cart battery lasts between 2-6 years. If you were to use less than 5 amps, you would have more than 100 amp-hours. If I increase my load, and draw at the C-10 rate of 20.7A, it can only store 207Ah, not 225Ah. Even with 1 to 2 hours of charging with all the alternator output going to the deep cycle the battery did not recharge completely. Happy wife, happy life. After approximately ten cycles they can be considered as ‘broken’ in. 0.2 HRS. A “Deep Cycle Battery” is designed to provide a steady amount of current over a long period of time. AGM Batteries do not have any liquid to spill, and even under severe overcharge conditions hydrogen emission is far below the 4% max specified for enclosed spaces. That means if the battery has an 11.25 amp load, it will last for 20 hours before the battery is empty at 5.25V. Now that we have some numbers about the battery and the motor we can start putting it all together. Average run cycle is 10 hours. Average run cycle is 10 hours. 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