Then Start off using the AC and you can see in actual time what number of kWh (units) of electricity your air conditioner is utilizing. I see the DC Amps & Volts desired inside the dc jack to the tools, or maybe the DC output while in the external power https://ac-bill-calculator33598.wikihearsay.com/3697246/the_2_minute_rule_for_ac_electricity_consumption_calculator