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At Outbax, our team of 30+ staff are passionate about offering quality products at a low price.

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100 Amp Deep Cycle Battery

Top 3 questions that customers ask when they are buying a 100 amp deep cycle battery for the first time: How Many Hours Will A 100 amp deep cycle battery last? A 100amp deep cycle battery battery will last 9.7 hours with an 85% efficient inverter. But we have to include the effects of Peukert’s Law, so the number will be from 6.5 to 9.7 hours depending on how many amps the appliance draws. Read more

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Pay only $2339.10 with FREE Shipping to most areas!

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  • Top-notch components put together on display with its transparent design
  • Now with 7 years Australian warranty
  • Produces up to two times the usable power of a lead-acid battery
  • It supports 6 batteries in parallel connection
  • Can be fully charged in 2 hours
  • Perfect fit for RV – L522 x W238 x H223
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SPECIAL OFFER!
PLUS a further 10% off using code VOLTX10
Pay only $1214.10 with FREE Shipping to most areas!

HURRY! Promo ends Sunday, May 29th 11:59pm AEST

  • Top-notch components put together on display with its transparent design
  • Now with 7 years Australian Warranty
  • Supports parallel connection up to 6x batteries
  • Supports series connection up to 3x batteries
  • Produces up to two times the usable power of a lead-acid battery
  • Built-in LCD voltage indicator
  • At just 19.5kg, it’s one-third of the weight of other batteries
  • LiFePO4 is the safest lithium battery technology on the market
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New

SPECIAL OFFER!
PLUS a further 10% off using code VOLTX10
Pay only $584.10 with FREE Shipping to most areas!

HURRY! Promo ends Sunday, May 29th 11:59pm AEST

  • Now with 5 years Australian warranty
  • Produces up to two times the usable power of a lead-acid battery
  • It supports 6x6 series connection and parallel connection
  • Can be fully charged in 2 hours
  • Perfect fit for RV – L301 x W169 x H215mm 
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Top 3 questions that customers ask when they are buying a 100 amp deep cycle battery for the first time: How Many Hours Will A 100 amp deep cycle battery last? A 100amp deep cycle battery battery will last 9.7 hours with an 85% efficient inverter. But we have to include the effects of Peukert’s Law, so the number will be from 6.5 to 9.7 hours depending on how many amps the appliance draws.

This assumes the appliance will run for an hour. The battery will last longer if the drawing load will only be a few minutes. You can run a 10A device for a maximum of 10 hours. But that same 100amp deep cycle battery battery will last more than 100 days if the device runs just 5 minutes a day.

Here is another example. You can run a 12V, 60W portable fridge on a 100amp deep cycle battery battery for 20 hours (60 / 12 = 5). But an energy-efficient fridge can operate only 15% of the day. It draws just .75ah / hour so the battery can last for days.

The inverter inefficiency determines how long a battery will last before losing all power. To figure out how long our 12V, 100amp battery will last, follow the steps below. You can use the same formula for any battery volt and ah rating. Just replace the numbers with your own. This is for a 12V 100amp deep cycle battery battery and an 85% efficiency rated inverter.

100W / 12V = 8.3 amps

8.3 / .85 = 9.7

As we pointed out above, we have to account for Peukert’s Law, so the battery might only last 6 hours. An energy-efficient appliance will make the battery last longer. For instance, a 100W LED TV will use less power than LCD, OLED, or older systems like plasma and CRT. That is why it is important that you use energy-efficient appliances. It will really make a difference when you are counting every watt.

The inverter must be the right size to run any appliance. If you are drawing 100W, the inverter capacity must be at least 125W. The minimum reserve power should be a minimum of 125% of the required power load. You can always get a bigger inverter, but do not settle for anything smaller because the appliance will not run.

How Long Can You Use A 100amp deep cycle battery?

Flooded lead-acid (FLA) batteries have a maximum 50% depth of discharge, while AGM and gel are between 50%-70% depending on the manufacturer. Unlike lithium, lead-acid batteries should not be fully discharged. Once the level drops below 50% there won’t be enough power to run the appliance. This is true whether it is 100W or any rating.

Not only will the appliance fail to run, but recharging below 50% reduces the life cycle of a lead-acid battery. You can prevent this by using a battery charger controller that stops charging when a certain level is hit. This is a great tool to keep the battery in good condition. Another option is to buy another battery and connect it to the appliance to provide more power.

Because you can only half the capacity of FLAs, you have to double the capacity if you need to run 100W at the maximum draw. A 12V 100amp deep cycle battery battery with a 50% DOD can run a 100W appliance for 10 hours, not 20. If you want to reach that 20-hour mark you have to buy a 200ah battery or use two 100amp deep cycle battery batteries.

Can I Connect Two 100amp deep cycle batteries?

Yes, you can. Doing so will increase the amp hours and run devices for longer periods. There are two ways to connect batteries, in parallel or in series. A parallel connection is ideal because it boosts the amp hour rating but the voltage is at the same level. In a series, the voltage doubles but the ah rating does not change.