A golf cart charger commonly draws roughly 700 to 1,500 watts while actively charging, although the exact number depends on pack voltage, charger output, charging stage, and efficiency. A charger rated around 48V and 15A may deliver about 720 watts to the battery before accounting for conversion losses, while higher-output chargers can draw more from the wall.
Charger watts depend on volts and amps
Electrical power is calculated as volts multiplied by amps. On the battery-output side, a 48V charger supplying 15A is about 720W. A 36V charger supplying 20A is also about 720W. The wall draw will be higher because no charger is 100% efficient.
Charging power changes during the cycle
A charger does not always pull maximum power from start to finish. Many chargers begin with a higher-current bulk stage, then reduce current as the battery approaches full charge.
How much electricity does one charge use?
Energy use is measured in kilowatt-hours, not just watts. If a charger averaged 1,000W for five hours, the session would use about 5 kWh. Real sessions can be lower or higher depending on how discharged the battery pack was and how the charger tapers.
Example cost calculation
If one charge uses 5 kWh and electricity costs $0.15 per kWh, the electricity portion of that charge is about $0.75. Replace those numbers with your actual local utility rate and measured energy use for a more accurate estimate.
Lead-acid vs lithium charging efficiency
Lithium systems are generally more energy-efficient during charging than flooded lead-acid batteries, but the complete result depends on charger efficiency, pack size, state of charge, temperature, and BMS behavior.
Use a plug-in energy meter for an exact number
The simplest way to measure a charger’s real wall consumption is with a properly rated plug-in electricity meter. Measure a full normal charging session and note the kWh reading rather than estimating from the charger’s maximum label alone.
For charger operation, see how a golf cart charger works. Our charger amps guide explains current ratings.
Bottom line
Most golf cart chargers draw well under the power of a large household appliance, but a full charge can still consume several kilowatt-hours. Measure kWh at the wall and multiply by your electricity rate to calculate the actual charging cost.
