![]() ![]() If you wanted to know battery run-time hours for lithium iron phosphate batteries, simply multiply any of the results by 1.189 (this is 95%/80% – the difference between deep-cycle lead-acid capacity and LiFePo4 capacity.) Renogy Batteries – Innovation Meets Quality – Shop Now! Is it ok to use a deep cycle battery in my car?Ī deep-cycle battery isn’t able to deliver the hundreds of amps needed to crank a cold car engine. LiFePo4 available capacity = 100Ah x 95% = 95Ahįor the rest of this post I’m going to assume the use of a lead-acid deep-cycle 100Ah battery as this is still the dominant battery technology in use. ![]() Lead-acid deep-cycle available capacity = 100Ah x 50% = 50Ah How long will a 100ah lithium battery last compared to lead-acid?Ī lithium-iron phosphate battery is inherently deep-cycle and can be discharge to 95% at normal temperatures with no damage. Lead-acid car battery available capacity for constant load = 100Ah x 15% = 15Ah How long will a 100ah leisure battery last compared to a car battery?Ī lead-acid deep-cycle battery, sometimes called ‘ leisure‘ batteries, can be discharge up to 80%, but 50% is recommended for regular use if you want to maximize it’s working life. This means effectively that for running any constant load, you only have up to 15% of the battery capacity available for use. If more, it’s life will be seriously shortened.Ĭar batteries are designed to deliver a lot of current quickly for cranking the engine, and then recharged quickly by the car’s alternator. This is a vital question because it directly determines how much power you have available for use.Īn ordinary car battery shouldn’t be discharge regularly more than 10 to 15%. If this is exceeded, then the capacity reduces accordingly. The battery label normally specifies a maximum discharge rate. Don’t think that a 100Ah battery can deliver 50 amps for 2 hours – you will be sorely disappointed! Table – Battery depth of discharge chartīattery efficiency is also determined by other factors, such as temperature and discharge rate. The above assumes full battery capacity, but the battery may be partly discharged.īy checking the terminal voltage, which is proportional to the state of battery discharge. Simple, right? Well, actually it isn’t as simple as that. Example: Run time = 100Ah battery capacity / 10 amps = 10 hours.Battery run-time = Ah capacity/load in amps.We can simply use the current taken by the load and the Ah capacity to work out the hours run time: This is the simplest situation to calculate as the battery delivers DC power to a DC load, so conversion isn’t required. How long does a 100ah battery last running a DC load? How long do lithium batteries last in cold temperatures?Īs you might expect, lithium batteries perform better than lead-acid, losing only 10% of their capacity at freezing point instead of 50% like lead-acid.Īll kinds of lithium batteries shouldn’t be charged or stored at low-temperatures. At these low temperatures you can also double the amount of cranking power needed to start your car. In the case a of a car battery, it’s unfortunate that as the efficiency goes down as the temperature drops, the engine needs more power to crank it.Īt 32☏ (0☌) battery power may be down 50% and more than 65% at 0☏ (-18☌). ![]() How long will 100ah battery last in cold weather?Īll batteries generate power through a chemical reaction and all chemical reaction are affected by temperature – the colder it gets, the worse they perform. ![]() Of course, it’s stated by the manufacturer, assuming full charge. The first step in calculating the life of your battery is to find out how many amp hours (Ah) capacity it has left to deliver. It depends on many factors like the battery capacity, your device’s wattage, how many watts you’re running per hour and the temperature of your environment. The main point is, there is no simple answer to this question. This article will go through a few different equations in order to compute the total watt-hours of energy that can be extracted from your battery over time. This can be a tricky question, as it’s not always as simple as just diving amp-hours by the load current to find out how long the battery will last. How do you calculate how long a battery will last? For AC loads the times will be reduced to 70% to 95%, depending on inverter rating/load ratio. How to work out how long a 100Ah battery will lastĪs a general rule, a 100Ah deep-cycle lead-acid battery discharged to 50% will run a 50 watt load for 12 hours, a 200 watt load for 3 hours and a 400 watt load for 1.5 hours. ![]()
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