====== HEMS Introduction ======

Home Energy Management System (HEMS) is a system for:
  * monitoring electricity flows at home (consumption, production, and storage),
  * control of key consumers,
  * optimizing consumption in terms of reducing consumption and using cheaper energy to ensure the same comfort with lower costs.

{{:hiq_energy:hems:flow_chart.png?direct&600|}}

===== HEMS Controller =====

It consists of an HEMS master controller ([[en:hiq_hw:mc-230|MC-230]]). 

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===== Temperature sensor =====

Temperature sensor is  directly wired ([[en:hiq_hw:es|Digital temperature sensor]]) or paired ([[en:hiq_hw:en-ts-iq|Wireless temperature sensor]] and [[en:hiq_hw:en-tsh-iq|Wireless temperature and humidity sensor]] ) to HEMS master controller [[en:hiq_hw:mc-230|MC-230]]. Only one temperature sensor can be added.

===== Power sensors =====

The measurement of electrical power and energy of all energy sources and main electrical consumers is provided by single-phase ([[en:hiq_hw:pm1-e-d|PM1-E-D]]) and three-phase ([[en:hiq_hw:pm3-i-d|PM3-I-D]] and [[en:hiq_hw:pm3-e-d-ct|PM3-E-D]]) power sensors which are connected directly to HEMS master controller [[en:hiq_hw:mc-230|MC-230]]. It supports:
  * **1 grid** power sensor
  * up to **3** sensors for local power **plants** (PV, Wind, Cogeneration, Generator, etc)
  * up to **2** local **storage** systems (home battery)
  * up to **8** managed **consumers** (electrical heating, electrical water heater, washing machine, tumble dryer, ...)

The measurement of main electrical consumers is also possible with wireless modules ([[en:hiq_hw:en-p1-iq|Metering smart plug]] and [[en:hiq_hw:en-p2-iq|Micro smart plug]]) which are paired to HEMS master controller [[en:hiq_hw:mc-230|MC-230]]. It supports up to **8** managed **consumers**.
===== Power relays =====

Are used for control of managed consumers. Power relays are toggling power supply or enabling signals for the operation of the device. They are controlled directly from HEMS master controller [[en:hiq_hw:mc-230|MC-230]].

===== Push buttons =====

Are used for manual control of managed devices. Push buttons are directly wired or paired ([[en:hiq_hw:en-sr-iq|Soft remote]]) to HEMS master controller [[en:hiq_hw:mc-230|MC-230]].

{{:hiq_energy:hems:hems_g2_sch2.png?direct&600|}}