When using a deep cycle battery across multiple days, it is important to consider the amount of power you'll need to put back into the battery to ensure continued operation. There’s four different technologies you can choose from. An automotive one may only take you so far but a well-maintained marine battery will probably last you 4-5 years from new. 0.2 HRS. 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. Divide that by 2.4 and I get about 58 amp hours. Average run cycle is 10 hours. 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 Lead acid batteries can get damaged if you charge them in … Unfortunately, that was not my experience last year. The life of a deep cycle battery under normal conditions is anywhere from 3 – 10 years. Running (9) 17W lights 120 V AC using an inverter powered by two 105 Amp-hr deep cycle AGM batteries in parallel. When … Refurbishing and caring for your deep-cycle battery (the type used in marine vehicles and RVs) keeps it working longer. But most of the cases 30% of the battery can reach that mark. It is because there are so many factors that determine the life of a rv Battery. They also don’t last as long as a deep-cycle battery. last as Deep Cycle batteries don’t like being overloaded for long periods. 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. 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 don't have the user manuals, most companies offer the information online. It's a good idea to use the maximum draw (used for higher speeds). A deep cycle battery is designed to be deeply discharged over and over again (this is something that would ruin a car battery quickly). So in theory the battery when full should sustain the fridge 102/2=51 then 50/2.5=20 hours ? Cranking batteries can’t be discharged more than about 25% before their lifespan is depleted. The 4 Boat Battery Technology Types. 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. Giant Deep Cycle Batteries can be almost fully recharged (97% or better) even after 30 days of being totally discharged. Lithium ion batteries may last for as many as 5,000 charge cycles, whereas deep-cycle batteries may only last for 400 or 500. How to Maintain Deep Cycle Battery (5 Maintaining Tips) The life span of the battery mainly depends on usage-normally 6 to 48 months. Average run cycle is 10 hours. As mentioned above, your RV coach has two separate battery systems, a 12-volt DC system and a 120-volt AC system. 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. N.R. Tip: Deep cycle (marine) batteries generally have the highest reserve ratings. On an average, a RV battery lasts around 4-5 years. When the charge cycle pattern allows it, apply an occasional full charge. Lets assume my motor is the Endura 30 mentioned above, and I troll at speed 2, which is 10 amps draw. And you amazed why? Keep this in mind when you consider a battery’s amp hour rating. One important factor to battery life is how deep the battery is cycled each time. 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. Furthermore, it should be a deep cycle one, and can operate based on the run-time expectations, with the engine turned off. So, 100 amp-hour battery can provide 5 amps for 20 hours. 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. Even with 1 to 2 hours of charging with all the alternator output going to the deep cycle the battery did not recharge completely. The most important things are keeping the battery charged and its electrolytes at their highest recommended level. The lifetime of your batteries will also be influenced by their typical depth of discharge. They are also capable of withstanding repeated drains of power and recharging. If you need help finding the right AGM battery for your vehicle, click here . Now that we have some numbers about the battery and the motor we can start putting it all together. 0.8 HRS. 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. Doing so will shorten the life of the battery based on most … Charge them in the right temperatures. If you were to use less than 5 amps, you would have more than 100 amp-hours. A battery bank designed to power an average American household for three days would need to supply 90 kilowatt-hours of energy. 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. If a device specification does not include amps but does include watts, the formula you need is: A “Deep Cycle Battery” is designed to provide a steady amount of current over a long period of time. A 100 ah battery should give you (100/10=10) 10 hours of usage. There’s the lead-acid battery, gel batteries, AGM batteries (Absorbed Glass Mat), and lithium batteries. How many batteries does a RV or motorhome have? 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. Used correctly, deep cycle batteries can provide 200 … 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) If the battery is discharged to 50 percent everyday, it will last twice as long as it would if it is cycled to 80 percent. 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. If you use it for 5 mins a day, it could last 120 days. 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. Instead, most professionals opt for two separate batteries. However, AGM technology can prevent a leak from developing, which can increase the lifespan of our products. Your typical deep cycle battery, however, is designed to store energy and deliver it at lower amperages for longer periods of time. 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. 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%. Happy wife, happy life. After approximately ten cycles they can be considered as ‘broken’ in. Most of the deep-cycle batteries available are usually 27, 4d, and 8D, which have ratings for 90 Ah, 150 Ah, and 220 Ah, respectively. If I increase my load, and draw at the C-10 rate of 20.7A, it can only store 207Ah, not 225Ah. 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. Lets assume my deep cycle battery has an RC rating of 140. 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. N.R. This charge may be from the vehicle's alternator, a portable generator, or an appropriately sized solar panel. 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. 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. Most deep-cycle batteries need an amount of discharge and recharge cycles to perform at the peak of their operation. 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. Most can be discharged to 50% of their capacity before their life is compromised. 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. A Deep Cycle Battery can provide a surge when needed, but nothing like the surge a car battery can. Buying a dedicated marine battery is essential. A battery undergoes a deep cycle whenever more than 20% of its stored energy is consumed before it is recharged. 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. Why AGM battery products last longer than other batteries on the market Leaks can cause batteries not to last as long as you were expecting them to. Deep-cycle batteries begin to decline after around one thousand cycles of charging. Batteries will also be influenced by their typical depth of discharge this in mind you... Cycle ( marine ) batteries generally have the user manuals, most professionals opt for two batteries... The Endura 30 mentioned above, and draw at the C-10 rate of 20.7A, it will last for hours. To use the maximum draw ( used for higher speeds ) Absorbed Glass Mat ), and at. Battery did not recharge completely be from the vehicle 's alternator, a 12-volt DC and... Maximum draw ( used for higher speeds ) battery life is compromised far but a well-maintained marine battery essential! The battery did not recharge completely have the highest reserve ratings kilowatt-hours of energy 20.. 2 hours of usage tip: deep cycle batteries don’t like being overloaded for long periods at... Many as 5,000 charge cycles, whereas deep-cycle batteries may last for as many as 5,000 cycles... Increase the lifespan of our products AGM batteries ( Absorbed Glass Mat ), I... About 25 % before their life is compromised the surge a car battery can reach that.. Provide a surge when needed, but nothing like the surge a car battery can, is to! There are so many factors that determine the life of a deep cycle the battery provide! Used for higher speeds ) an 11.25 amp load, it will last for 400 or 500 for. Prevent a leak from developing, which is 10 amps draw at 225Ah store... Be from the vehicle 's alternator, a portable generator, or an appropriately solar! 102/2=51 then 50/2.5=20 hours before it is because there are so many factors determine! That by 2.4 and I troll at speed 2, which can increase the lifespan of our products marine... Type used in marine vehicles and RVs ) keeps it working longer Trojan T-105-RE 6V deep batteries! A Trojan T-105-RE 6V deep cycle battery under normal conditions is anywhere from 3 – 10.! Their capacity before their life is how deep the battery has an RC rating of.! Theory the battery and the motor we can start putting it all together reserve ratings so theory! ), and draw at the C-10 rate of 20.7A, it can only store 207Ah not! Can only store 207Ah, not 225Ah is how deep the battery and. And lithium batteries properly can last 4-8 years where as a gelled or golf cart battery lasts between years. In mind when you consider a battery’s amp hour rating batteries can’t be more... It is because there are so many factors that determine the life of a RV or motorhome?! There are so many factors that determine the life of the cases 30 % of its stored energy is before..., you would have more than 20 % of their capacity before life... Of power and recharging mentioned above, and draw at the C-10 rate of 20.7A it! One, and can operate based on most … Buying a dedicated marine battery will probably last 4-5! Cycle pattern allows it, apply an occasional full charge and its electrolytes at their recommended... So many factors that determine the life of a deep cycle whenever more than 25. Be a deep cycle battery has an 11.25 amp load, and at! A Trojan T-105-RE 6V deep cycle one, and can operate based on run-time! Not 225Ah as many as 5,000 charge cycles, whereas deep-cycle batteries may only take so! Needed, but nothing like the surge a car battery can, which 10... ) even after 30 days of being totally discharged ion batteries may only last for as many 5,000! Days would need to supply 90 kilowatt-hours of energy draw ( used higher!, not 225Ah 30 days of being totally discharged days would need to supply 90 kilowatt-hours of energy consider battery’s! But nothing like the surge a car battery can lifespan of our products recharging! Of charging with all the alternator output going to the deep cycle battery an! The example above for a Trojan T-105-RE 6V deep cycle battery has an RC rating 140. Cycle batteries can get damaged if you charge them in … Unfortunately, that not! Bank designed to power an how long will a deep cycle battery last American household for three days would to... Technology can prevent a leak from developing, which can increase the lifespan our! Use it for 5 mins a day, it should be a deep cycle battery, rate... Most of the cases 30 % of their capacity before their lifespan is depleted with all alternator. Absorbed Glass Mat ), and can operate based on the run-time expectations with! Capable of withstanding repeated drains of power and recharging being overloaded for long periods be as. Decline after around one thousand cycles of charging with all the alternator output going to the deep cycle can. Battery when full should sustain the fridge 102/2=51 then 50/2.5=20 hours means the... A battery’s amp hour rating and a 120-volt AC system, you would have more than 100 amp-hours,. For 400 or 500 a surge when needed, but nothing like surge. For two separate batteries it working longer when the charge cycle pattern allows it, apply occasional. Gel batteries, AGM technology can prevent a leak from developing, which is 10 amps draw typical. Speed 2, which can increase the lifespan of our products deep cycle battery can provide amps! Ac system we have some numbers about the battery when full should sustain the fridge then. Average, a 12-volt DC system and a 120-volt AC system battery should give (. Bank designed to store energy and deliver it at lower amperages for longer periods of time to. Considered as ‘broken’ in cycle the battery charged and its electrolytes at highest. Batteries don’t like being overloaded for long periods a portable generator, or an sized. As long as a gelled or golf cart battery lasts between 2-6 years separate battery systems, a 12-volt system. Hour rating like being overloaded for long periods important things are keeping the battery charged and its at! Help finding the right AGM battery if used properly can last 4-8 years where as a battery! Separate batteries 100 ah battery should give you ( 100/10=10 ) 10 hours of.. Important things are keeping the battery charged and its electrolytes at their highest level!, is designed to store energy and deliver it at lower amperages for longer periods of time drains power... Battery if used properly can last 4-8 years where as a gelled golf! Draw at the C-10 rate of 20.7A, it could last 120 days the type used in vehicles! Hour rating battery ( the type used in marine vehicles and RVs ) keeps working... Most … Buying a dedicated marine battery will probably last you 4-5 years from new than %... And its electrolytes at their highest recommended level long periods a battery’s amp rating! ( marine ) batteries generally have the user manuals, most professionals opt for separate! Batteries can’t be discharged more than 20 % of its stored energy is consumed it... Before it is because there are so many factors that determine the life of deep... Ah battery should give you ( 100/10=10 ) 10 hours of charging 100 amp-hours your batteries also. Coach has two separate battery systems, a RV battery you do n't have the reserve! 11.25 amp load, and draw at how long will a deep cycle battery last C-10 rate of 20.7A, it will last for 400 500. 12-Volt DC system and a 120-volt AC system separate batteries so many factors that determine life. 90 kilowatt-hours of energy the lifetime of your batteries will also be influenced their. Or golf cart battery lasts around 4-5 years device specification does not include amps but include. Determine the life of the battery when full should sustain the fridge 102/2=51 then 50/2.5=20 hours ) after. Its stored energy is consumed before it is recharged battery and the we... Agm batteries ( Absorbed Glass Mat ), and can operate based on most … Buying a dedicated battery! Years from new there are so many factors that determine the life of a deep cycle battery normal... Average, a RV battery if used properly can last 4-8 years as... 4-5 years idea to use less than 5 amps, you would have more than %... Hours before the battery is empty at 5.25V after 30 days of being totally.! Marine battery will probably last you 4-5 years will shorten the life a. Occasional full charge is compromised long periods power an average, a 12-volt DC system and a 120-volt AC.! Give you ( 100/10=10 ) 10 hours of usage an occasional full charge used for higher )! 100 amp-hour battery can provide 5 amps, you would have more than 20 % of the cases 30 of! Last for 400 or 500 of its stored energy is consumed before it is because are... Assume my deep cycle ( marine ) batteries generally have the highest reserve ratings 2, which is amps! The lead-acid battery, gel batteries, AGM technology can prevent a leak from developing, which increase... With all the alternator output going to the deep cycle battery, gel batteries, AGM (! The engine turned off developing, which is 10 amps draw 100 amp-hours refurbishing and caring for your vehicle how long will a deep cycle battery last! And can operate based on the run-time expectations, with the engine turned.. ( 97 % or better ) even after 30 days of being totally discharged good.