Vaio P-Series Power Usage

Overview

This page presents some results on measuring the power consumption of the Sony Vaio P-Series PCG-1R1W for various types of usage. The purpose is to understand how to make better use of existing battery capacity and to build an appropriate minimal portable solar recharging system.

Method

A 2.7mm power socket and power plug are connected together with a tap point for a digital multimeter. The multimeter is used to measure power consumption by measuring both the voltage and current. Power is calculated according to

$$P=IV$$

Voltage from the standard power supply is fairly consistent, but under higher loads it drops a little bit.

Results

Operation Voltage (V) Current (A) Power (W) Notes
Unplugged 10.63 0 0 Just power supply
Charging from flat 10.41 1.25 13.0 Initially draws 0.24A for several seconds then jumps up to 1.25A
Running Linux and charging from flat with wireless on at 2GHz CPU 10.35 1.56 16.2
Running Linux and charging from flat with wireless off at 2GHz CPU 10.35 1.46 15.2
Running Linux and charging from flat with wireless on at 800MHz CPU 10.35 1.56 16.2
Running Linux and charging from flat with wireless off at 800MHz CPU 10.35 1.46 15.2
Running Windows 7 and charging from flat with wireless on 10.35 1.62 16.8 Some periodic drops
Running Windows 7 and charging from flat with wireless off 10.35 1.56 16.1 Some periodic drops
Running Linux with no battery with wireless on, display dimmed, 800MHz 10.48 0.72 7.5
Running Linux with no battery with wireless on, display undimmed, 800MHz 10.48 0.85 8.9
Running Linux with no battery with wireless off, display dimmed, 800MHz 10.48 0.65 6.8
Running Linux with no battery with wireless off, display undimmed, 800MHz 10.46 0.75 7.9
Suspend with no battery 10.61 0.05 0.5
  • #1 written by David
    about 6 years ago

    Impressive testing; and would be interested to hear more about a Solar charger for this.

    I heard elsewhere that the Vaio P used 68 watts. Is my knowledge of electrics insufficient or do your results show a much lower wattage?

    • #2 written by Simon
      about 6 years ago

      Yes, you’re right. My results are much lower than 68W. I haven’t seen those figures you mention before, and they’re certainly not consistent with what I’ve measured.

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