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Mar 11, 2025 · The best lithium batteries for 3000-watt power inverters are high-capacity, high-discharge lithium iron phosphate (LiFePO4) batteries that provide reliable, efficient power
The c-rate of lithium is 1. We can draw 100Ah x 1C = 100Amps. That is enough to power a 3,000 watt inverter without over-working the battery. You need to have 4 lithium batteries in series to power a 3,000 watt inverter. How many 100Ah batteries do I need for a 3000 watt inverter? You need 4 Lithium batteries in series to run a 3,000W inverter.
To keep your batteries operating safely and reliably, it is always recommended to go for a somewhat larger battery bank- generally, for lead-acid batteries 6 x 100Ah 24V battery Or 12 x 100Ah 12V battery is the smallest battery bank recommended for the 24V 3000W inverter.
Lead-acid batteries have a C-rate of 0.2C, while lithium (LiFePO4) batteries have a higher C-rate of 1C. 12V for inverters below 1000W. 24V for 1000-2000W inverters. 48V for 2000-4000W inverters. We need to satisfy two criteria before we can tell you what battery you need. These are:
For a 12V 3000 watt inverter: 3000 watts / 12 volts = 250 amps. This means that when fully loaded (3000 watts), it will draw 250 amps from the batteries (ignoring things like efficiency). So, you would need batteries with a capacity to meet a discharge rate (C-Rate) that allows the inverter to draw 250 amps safely.
Since the recommended C-Rate for lithium batteries is 0.5C, you would need at least batteries with a capacity of (250A ÷ 0.5 =) 500Ah 12V or 6 kWh. For a 3000 watt inverter at 24 volts: 3000 watts / 24 volts = 125 amps. You would need batteries with a capacity that allows the inverter to draw 125 amps safely.
With a 3000W inverter, you will usually draw much less than 3000W. For example, just running a TV would only draw about 70W. So work out what appliances you want to run and the total wattage of these devices to find your power draw. 3. Runtime Calculation Let’s do some example calculations. The equation you need to use are as follows:
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