![]() ![]() ![]() The example stands if you want to deplete the battery fully. If you’re going to use a 300AMP 12V battery, you will have to divide the 300A/250A, resulting to one and a half-hour of runtime. Suppose you have a 3000W 12V inverter that you want to max out, then to pull 3000W per 12 volts = 250 DC amps/hour will be required. Here is a simple calculation for you to understand this technique better. ![]() The result is the total watts per DC volts equal amps needed. To know the size of your battery bank, take the hours required to power an inverter and multiply by watts. Secondly, as the battery voltage drops, the inverter is going to try to keep the output voltage constant by drawing in more current.Firstly, the battery doesn’t stay at 12 volts as it discharges.However, some other factors also contribute to this. If the battery is 250AH, a simple calculation will show that it will last for approximately 35 hours & 42 minutes. If the battery is 100AH, a simple calculation will show that it will last for approximately 14 hours & 7 minutes. If the battery is 40AH, a simple calculation will show that it will last for approximately 5 hours & 42 minutes. If, for example, you assume 90% efficiency with a 75-watt load, then the inverter will draw about 83 watts. The maximum load capacity of the inverter is not particularly relevant – the efficiency is. If one does not know the battery capacity and type of battery they are using, it is impossible to find out the duration of the battery supporting an inverter.ĭo not worry we will help you answer these questions and many more. Is it actually designed for deep cycle use or,.You should have some basic information before you can figure out the answer to your question. In this article, we will discuss some of those major contributors that affect the average time a car battery can power an inverter. Many factors must be added up for the correct answer to the question, ‘how long can a car battery power an inverter?’ One cannot say exactly how long that time duration will be. ![]()
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