Does a larger 12v battery inverter consume more power

Do inverters use a lot of power?

Generally, yes. Inverters have an idle power usage. A Victron 48/5000 burns 30W just by being powered on. That's 0.72kWh/day or 60Ah of 12V battery capacity - would kill a medium size car battery in 24 hours even if no loads are supplied. The MPP Solar/Growatt units and most all-in-ones are notorious for high idle energy consumption.

Do inverters consume the same amount of battery power?

Look at the efficiency curves and do your calculation. – Eugene Sh. Approximately, yes, they would consume the same amount of battery power. All else being equal. But some inverters are more efficient than others. And there are a lot of very poor quality inverters available on the market for some reason.

What wattage Inverter should I use?

Match the inverter’s continuous wattage rating to the battery’s discharge capacity. For a 12V 200Ah battery (2.4kWh), a 2000W inverter is ideal. Formula: Inverter Wattage ≤ (Battery Voltage × Ah Rating × 0.8). Factor in surge power needs but prioritize sustained loads.

Would a 1000 watt inverter consume the same amount of battery power?

Approximately, yes, they would consume the same amount of battery power. All else being equal. But some inverters are more efficient than others. And there are a lot of very poor quality inverters available on the market for some reason. Note that a 1000 Watt inverter would need to use around 100 Amps from the battery to produce a true 1000 Watts.