Storing grid electricity in the home usually relies on a Home Energy Storage System (HESS)

 Storing grid electricity in the home usually relies on a Home Energy Storage System (HESS). This system can store electricity when electricity prices are low or there is excess electricity, and release electricity when electricity demand is high or there is a power outage, helping save electricity costs, emergency power supply, and improve energy independence.

1. Main ways of home energy storage

Home battery energy storage system

This is the most common and mature way of home energy storage, relying on batteries to store electricity, mainly including the following types of batteries:

Lithium-ion battery

  • Features: high energy density, small size, long life (10-15 years), high efficiency (90%+).
  • Advantages: fast charging and discharging speed, small footprint, high degree of intelligence.
  • Disadvantages: high price, limited capacity, and attention to fire safety.
  • Applicable scenarios: photovoltaic self-generation and self-use, peak shaving and valley filling, power outage emergency.

Lithium iron phosphate battery (LiFePO4)

  • Features: safer, long life (6000 cycles), high temperature resistance, environmentally friendly.
  • Applicable scenarios: long-term household energy storage, especially suitable for areas with higher temperatures.

Lead-acid battery

  • Features: low cost, mature technology.
  • Disadvantages: short life (3-5 years), low efficiency (60%-70%), large size.
  • Applicable scenarios: emergency power supply with limited budget, short-term needs.

Portable energy storage power supply (outdoor power supply)

  • Features: small, easy to move, plug and play, power is usually between 300W~5000W.
  • Applicable scenarios: short-term power outages in the home, outdoor camping, mobile power supply.

Hydrogen fuel energy storage (emerging technology)

  • Features: Use electricity to electrolyze water to produce hydrogen, and then use hydrogen fuel cells to generate electricity, with unlimited theoretical storage time.
  • Applicable scenarios: Long-term power supply, remote areas, not yet popular.

2. application scenarios of household energy storage

  1. Photovoltaic + energy storage system
  • Solar power generation stores excess electricity during the day and uses it at night or on cloudy days.
  • Advantages: Save electricity bills, reduce dependence on the power grid, and be self-sufficient in green electricity.
  • Adaptation mode:
  • Self-generation and self-use, surplus electricity is connected to the grid (suitable for families with large photovoltaic power generation and low electricity consumption during the day).
  • Self-generation and self-use, no access to the grid (suitable for users with small photovoltaic power generation and reduced dependence on the grid).
  1. Peak shaving and valley filling, saving electricity bills
  • Principle: charge when electricity prices are low (valley time), discharge when electricity prices are high (peak time), and reduce electricity costs.
  • Applicable to households: areas with peak and valley time-of-use electricity price policies.
  1. Household emergency backup power supply
  • Principle: store grid power and provide electricity for key equipment such as lighting, refrigerators, Wi-Fi, etc. during power outages.
  • Applicable to households: areas with frequent power outages and natural disasters.

3. selection guide for household energy storage systems

| Parameter | Recommended value | Reference suggestions |

| ———– | ————- | ——————- |
| Capacity (kWh) | 5-20kWh | Daily electricity consumption is 2-5 hours, and photovoltaic energy storage has a larger capacity. |
| Power (kW) | 3-10kW | Covers major household appliances such as air conditioners, refrigerators, and lighting. |
| Battery life | ≥10 years | Lithium batteries have a long life, better than lead-acid batteries. |
| Efficiency (charge and discharge) | ≥90% | The higher the efficiency, the smaller the energy storage loss. |
| Intelligent management | APP remote monitoring | Real-time monitoring of power, electricity consumption, and fault diagnosis. |

4. is it suitable for installing home energy storage?

Situations suitable for installing home energy storage:

  • Having a photovoltaic system, hoping to increase the proportion of self-use and reduce dependence on the power grid.
  • Areas with time-sharing electricity prices, using the peak-valley price difference to reduce electricity costs.
  • Areas with frequent power outages or high risk of extreme weather.
  • Strong environmental awareness, pursuing a green and low-carbon life.

Situations not suitable for installing home energy storage:

  • Low electricity costs, few power outages, and long investment payback period (8-10 years).
  • Areas with stable power grids and low returns on photovoltaic investment.

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