capacity loss due to the strong discharge current: 98.1A is very close to the 1.0C current, So, if You have a brand new, fully charged 12V 100Ah lead-acid deep cycle battery and You want to power a 1000 Watt inverter with an energy efficiency of 85%, You can expect a runtime of ~30-35 minutes. Lead-acid batteries are heavy and support up to 200-300 charging/discharging cycles down to 100% DoD and up to 400-500 charging/discharging cycles down to 80%.Īlso, lead-acid batteries are cheap and reliable - after all, they are used for centuries!īut, the biggest issue with lead-acid batteries is the capacity loss when they are discharged with strong currents - for example, 1.0C current causes capacity loss down to 55-72% of the battery's nominal capacity. 1000 Watts Inverter Battery Sizingīattery size in terms of voltage and capacity depends on the actual load and required runtime of the battery-inverter system.īasically, there are two types of deep cycle batteries suitable as inverter batteries - lead-acid batteries and lithium batteries, each one with its own pros and cons. Note: most power inverters feature energy efficiency in the 85-90% range, with 85% being more common - this must be checked for each inverter model. Also, smaller currents mean less heat loss in the wires, increasing the overall energy efficiency of the system. Also, as the battery voltage is increased, required currents are significantly decreased. The following table lists required battery power and current in order for the inverter to provide 1000W, depending on the inverter energy efficiency and the battery voltage: Energy Efficiency (%)Īs one can see, input power varies significantly depending on the energy efficiency of the power inverter. In order to calculate battery current draw, we use the following formula: P Bat (W) = P Inv (W) / Energy Efficiency (%) In order to calculate the inverter current draw, first, we must calculate input power - the power that the battery must provide to the inverter in order for the inverter to provide 1000 output Watts. Surge power is usually double the continuous power and is usually in the 1500-2500W range - this is output power that the inverter can provide for a very short period of time and is required when tools and appliances with electric motors and similar loads are powered using inverters. Surge vs Continuous Power: 1000W power inverters feature continuous power of 1000W, although some models support up to 1100-1200 watts. Input Voltage: Most 1000W power inverters are 12V units with some models accepting a broader range, including 24V, 36V, and even 48V.Įnergy Efficiency varies depending on the model, but on average power inverters feature energy efficiency in the 80-95% range - of course, models with higher energy efficiency tend to be more expensive. When calculating the required current and power of the inverters one must know output power (watts), energy efficiency of the power inverter, and input voltage. Inverter Current (Amps) and Power (Watts) Draw However, many people wonder what is the actual load on the battery in terms of the current draw. With 1000 continuous watts and often 1500-2000 surge watts, 1000 watt inverters are suitable for powering smaller devices, tools, gadgets, and appliances. How Many Amps Does a 1000 Watt Inverter Draw?ġ000 Watt inverters are a very popular class of power inverters suitable for use even with car batteries, at least for shorter periods of time.
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