How long will a 12v battery last with a 1500 watt inverter?Ī 12 volt 50Ah lithium iron phosphate (LiFP04) battery with regular depth of discharge (DoD) of 80% will run a fully-loaded 1500 watt inverter for 13 minutes. Run-time = 0.6 hours x 95% = o.57 hours (34.2 minutes) Calculator – How long will a 12v battery last with a 1000 watt inverter?Įnter the size of your 12 volt battery into the calculator below to find how long it will run a 1000 watt inverter load: This means that the battery will last 600 Wh/1000W = 0.6 hoursįurthermore, if we apply the average inverter efficiency of 95%, then a closer estimate of a 100Ah 12 volt battery run-time would be: Remember that the recommended regular discharge level for a lead-acid deep-cycle battery only 50%, so the actual available capacity is 600 watt-hours. Simply multiply available Ah by the battery voltage to find its watt-hours capacity:īattery watt-hours = amp-hour capacity x battery voltsīattery watt-hours = 100Ah x 12V = 1200 watt-hours The easiest way to calculate 100Ah 12 volt deep-cycle run-time is to convert the amp-hours to watt-hours. This calculation takes into account average pure sine wave inverter efficiency of 95%. A typical battery size for leisure batteries is 100Ah, so I’ll use this capacity to answer the following questions: How long will a 12 volt battery last with a 1000 watt inverter?Ī 12 volt 100Ah deep-cycle battery with regular depth of discharge 50% would run a fully-loaded 1000 watt inverter for 34 minutes. Obviously, the bigger Ah batteries will last longer than the smaller. 12V lead acid deep-cycle batteries can be from 50Ah to 200Ah capacity. Questions often refer to a 12 volt battery inverter, but this covers a very broad spectrum of possibilities.
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Satcon PowerGate Plus 100 kW UL How to work out how long a 12v battery can last with inverters of various sizes
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Source: Popular Battery Inverter Data Sheets and Efficiency Curves PDF Download Inverters can be very inefficient when lightly loaded. The inverter size should be matched to the average load expected so that it’s always (or mostly) above 40% loaded. If sourcing the inverter and energy storage batteries with solar, then this can be a big deal. You can see form the graph in the image below that below 30% load most inverters lose efficiency rapidly, which means you’re wasting your power. This kind of efficiency only occurs if the inverter is reasonable loaded. The best inverters have an efficiency of between 93% and 97% and the price increases accordingly. However, even the best quality electronics devies have losses. They are much more efficient than their modified sine wave cousins and the price reflects that.Ĭonsidering the possible negative effect on appliances and possible interference with electronics, it is the best option.
Let’s assume that most people would buy the pure sine wave inverter variety. What does an inverter do, pure sine or modified wave form? PDF Source: How efficient are 12v inverters? Are lithium batteries better than lead acid? This type of battery are used for all kinds of energy storage purposes and are common in RVs. However, 50% discharge is mostly recommended as the average 12 volt deep-cycle lead acid battery will last up to 30% longer.
The deep-cycle, or leisure battery as it’s called, can be discharged to 80% of its capacity. Within the lead-acid battery technology, there is another type designed to deliver sustained currents and is often used for energy storage in solar generation systems. Within minutes it’s fully charged again! Car battery vs deep cycle Once a car battery has delivered that enormous starting power, the engine alternator immediately starts to charge it rapidly. They can provide up to 900 amps to crank a cold engine but don’t handle medium current draw for long periods of time very well. Resource: Suozzo, Christopher – Lead-Acid Battery Aging and State of Health DiagnosisĪutomotive batteries are often call SLI (Starting, Lights and Ignition) and they are designed to do just that.
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