Yes, a cordless, rechargeable vacuum cleaner that is left permanently on its plugged-in charger will generally use more electricity over time compared to a conventional corded vacuum that is only plugged in while in use for a short duration each day.
The reason for this is that even when a cordless vacuum cleaner is fully charged and not actively being used, it continues to draw a small amount of power while plugged in to maintain its battery charge. This constant trickle charging is necessary to keep the battery at an optimal level for when the vacuum is needed.
On the other hand, a conventional corded vacuum only consumes electricity while it is actively being used during the half-hour period each day. Once the vacuuming is done, you can unplug it, and it won't draw any power when not in use.
Here's a comparison of the two scenarios:
Cordless, Rechargeable Vacuum:
- Constant trickle charging when left plugged in: Consumes electricity continuously even when not in use.
- Usage time: Can be used until the battery is depleted (typically 20-60 minutes depending on the model) before requiring a recharge.
Conventional Corded Vacuum:
- Consumes electricity only during usage time (e.g., 30 minutes per day).
- No power consumption when not in use if unplugged.
Over time, the constant trickle charging of the cordless vacuum can add up, resulting in higher electricity usage compared to the corded vacuum, which only draws power during its actual usage period. If energy efficiency is a primary concern, using the corded vacuum only when needed and unplugging it when not in use would be a more economical choice.
However, it's essential to consider other factors such as convenience, maneuverability, and battery life when choosing between a cordless and corded vacuum cleaner. Some people may prefer the flexibility and ease of use of a cordless vacuum despite the slightly higher energy consumption.