A decent fridge around that size under 30 degrees ambient temperature shouldn't use more than around 30 - 40 amp hours a day. Most inverters are about 90% efficient. 3 Answers. Once your engine is running, it maintains that full charge. Batteries are designed to produce a specific voltage, and they are rated for a certain number of amp-hours. Cheers. if it was left in freeze mode and drew the 3.6a or more for the full period, then you are down to just less than 20hours on a 100% 70a battery . Hopefully, it makes sense! Average run cycle is 10 hours. This time is less for a long road trip. Most 1500w-2000w applications such as microwaves and electric kettles will only run for a few minutes, this will be fine to use with a 100AH+ battery. 2. How long will a deep cycle battery run a refrigerator? You’ll also find that 240v socket for powering the laptop, coffee machine, or foot spa. More amp hours the batteries give more the number of hours refrigerator will run. i'm trying to figure out just how long this fridge could run without running the engine to charge battery. Now of course a fridge does not take a continuous current. Reply • May 18, 2016 at 12:40 pm BatteryStuff Tech Mark you typically want to charge at 10% or you risk overworking the charger. The best way to ensure your fridge will stay cold overnight and your car will start in the morning is with a Dual Battery System.. As the name suggest’s when you have a dual battery system installed you will have two batteries in your vehicle. Taking all of this into account when you calculate how long your RV batteries can run the furnace you should be taking the number of amp hours your battery holds and cutting it in half. The table below gives you an indication on how long you might be able to run it for without recharging. if you use an average of 3a, 1 x 70ah battery , at 100% capacity, has a theoretical probability of running the fridge for 23 hours. Well… Really… the simplest answer to this question is… Use a separate battery to power your fridge. A deep cycle battery is designed to use a little bit of power for a long period of time. I’m a long way off knowing everything there is to know about 12V systems, but I do know people run their 12V batteries too flat, and damage them in the process. Despite being this important, many RV owners still don’t seem to take battery maintenance as a serious matter. And some of the best ADM or Lead Acid batteries can be run down to 75% of their maximum charge without damage. It basically held my battery and told me how much charge was remaining. I expected a lot more, maybe at least 3 days seeing that the fridge was never opened. Hi, I’m Jimmy Mitchell and I love exploring the off beaten tracks with my wife and two boys. All the gear and no idea!!! Most can be discharged to 50% of their capacity before their life is compromised. A refrigerator requires lots of power. You need a battery of minimum 80A and a 100 watt solar panel. The best way to ensure your fridge will stay cold overnight and your car will start in the morning is with a Dual Battery System.. As the name suggest’s when you have a dual battery system installed you will have two batteries in your vehicle. The most common way to run a fridge is with a second battery, which is isolated from the main cranking battery. ... My battery usually quickly broken, probably because they haven’t run out of battery yet but I still charge or charge too many times. Cranking batteries can’t be discharged more than about 25% before their lifespan is depleted. To make a fairly accurate estimation, you’ll also need to consider the appliances’ running time. So I hope this article helps you out with working out not only what kind of battery you need to run your fridge, but also how to actually take your battery with you! and would this set up work long term,or any suggestions would be great.Thanks. Which means you can power your car fridge for longer between charges. There are three components to a basic 12-volt solar-charged setup: 1. As an avid 4 wheel driver, I’m very keen to share my experiences and adventures. A starter battery is designed to use a lot of power for a short period of time (starting a car). For example, these times assume you discharge the deep-cycle battery 70% (30% of total charge remaining), and they assume that your battery has 100% of its’ listed capacity. Probably find that 240v socket for powering the laptop, coffee machine, or an appropriately solar! At all produce a small fridge led lights all around and basic charging necessities iPad etc very long at.. 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