This also means that appliances with bigger loads such as desktop computers, televisions, and other electronics will drain your battery faster. This is because if you're going to, let's say, force a 45-watt load to run for 11 hours in a 100 AH battery there's a huge likelihood that there won't be enough power left to beef up the starter motor. However, you still need to be cautious when dealing with your inverter even if you already know the figures. So, for example, if your battery has a 100 amp hour capacity and you’re going to use it on a laptop that uses only 45 watts, then you’re going to get around 11 hours of working time from your battery. However, you need to know your appliance’s wattage and battery’s reserve capacity before you can input the figures in the formula. Use this formula to know how long your battery will last: Meanwhile, the amount of time that you use your power inverter to run your appliances will depend on your battery’s power capacity. If it runs on a 24-volt system then divide it by 20.
This is if your appliance runs on a 12-volt system. To do this, you first need to divide its watts load by 10. The size of the battery bank can then be calculated once the running time and load are established. If it runs 1/3 of the time, then it would be running around 250 watts per hour.
Take for example a refrigerator that's powered by a 750-watt compressor. However, there are a few loads that aren't constant, which is why it is important for them to get estimations. This gives you a hint on how much power your appliance can take. Also look at an appliance’s input electrical nameplate and add up its total requirement. You can know how long your battery will last if you estimate the load’s total watts. These figures are important to remember because these are where your battery’s efficiency depends on. Meanwhile, a 24-volt inverter system needs a battery’s 10 DC Amps for every 200 watts. capacity.Įvery 100 watts of a 12-volt inverter system needs around 10 DC amps from its battery. This is referred to as the Amp-Hours or A.H. Your battery’s capacity can also be expressed by the number of amps and how many hours your battery will last. One good way of knowing the watt measurement is by multiplying volts by amps.
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