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Add detailed power consumption measures

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Gauthier Provost 2019-03-07 15:29:27 +08:00
parent 68797a221d
commit 1d039c2b22
2 changed files with 32 additions and 7 deletions
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29
docs/hardware.md
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@ -6,7 +6,6 @@
### A388 System-On-Chip
![!Block Diagram](/img/hardware/soc_block_diagram.png)
## Connector / Interface List
![!Board Legend](/img/hardware/board_legend.jpg)
@ -77,6 +76,34 @@ Helios4 board exposes on header J9 the SoC I2C Bus 1. Below is the header pin-ou
![I2C Pinout](/img/hardware/i2c_pinout.png)
## Power Consumption
**Board only**
* Idle : 3.6 Watts
* Active : 5.6 Watts
**Full Kit (with 4x HDDs)**
| State | AC calculated<br>power consumption | DC measured<br>power consumption | Remarks |
|---------------------|----------------------|----------------------|---------------------|
| Idle | 19.3 W | 16.8 W | |
| HDD Read Access | 27.4 W | 22.8 W | |
| HDD Write Access | 30.3 W | 25.2 W | |
| Standby | 8.0 W | 6.7 W | HDD in Standby mode |
| Suspend-to-Ram | 7.2 W | 6.0 W | HDD in Standby mode |
!!! note
Measures were done using a Current Clamp Meter on the Helios4 12V DC input. AC Power consumption is calculated based on a AC/DC conversion efficiency of 85%.
* Meter tool : Extech 380942 - 30A True RMS AC/DC Mini Clamp
* AC/DC Adapter : yczx1268 (efficiency : 85%)
* AC Input Voltage: 220V
* HDD: 4x WD Red 2TB (WD20EFRX) configured as RAID10
* Network : Connected at 1000Mb/s
* OS: ARMBIAN 5.73 stable Debian GNU/Linux 9 (stretch) 4.14.98-mvebu
## HDD Recommendation List
We recommend HDD which are designed for NAS (Network Attached Storage). Those NAS HDD are specially conceived for reliable 24/7 operation and offers lower power consumption and dissipation, less vibration and noise, and finally better warranty. We recommend the following models :

10
docs/wol.md
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@ -165,16 +165,14 @@ Measured using Sonoff POW R2 on AC side
| Power state | Power (Watt) | Current (Ampere) | Remarks |
|---------------|---------------|------------------|---------|
| Idle | 16.18 - 19.87 | 0.14 - 0.17 | |
| Standby | 8.24 - 8.63 | 0.09 - 0.10 | |
| Suspend | 7.46 - 7.71 | 0.07 - 0.08 | |
| Halt/Shutdown | 11.95 | 0.11 | HDDs still active, fans run on full speed |
| Idle | 19.87 | 0.17 | |
| Standby | 8.63 | 0.10 | HDD in Standby mode |
| Suspend | 7.71 | 0.08 | HDD in Standby mode |
!!! note
* Nominal Input Voltage: 220V
* HDD: 4x WD Red 2TB (WD20EFRX)
* [I2C OLED screen](/i2c/) attached to the systems
* Variation of power consumption sometimes due to fluctuation of the input voltage
## Issues
@ -190,4 +188,4 @@ Therefore it is advised to always enable WOL (**sudo ethtool -s eth0 wol g**) be
When system is put in suspend mode, the PWM feature controlling the fan speed is stopped. The fans will either spin at their lowest speed ([Batch 1 fan](/pwm/#old-fan-batch-1)) or stop spinning ([Batch 2 fan](/pwm/#new-fan-batch-2)). In the latest case, while this is not an issue for the SoC itself which is designed to run with passive cooling, it might have a negative impact on the HDD peripherals because the ambient temperature inside the case will rise.
Therefore it is advised to ensure that when system is suspended the case ambient temperature will not exceed the operating temperature your HDDs are rated for.
**Therefore it is advised to ensure that when system is suspended the case ambient temperature will not exceed the operating temperature your HDDs are rated for.**