10kwh household energy storage project

10kwh household energy storage projects

This article will introduce the Grevault 10kwh household energy storage project.

Grevault household energy storage system combines the latest technology and development trend of contemporary photovoltaic modules, and fully considers the actual needs of users.

It has great convenience and safety in design and application, brings the greatest value to users as much as possible, and can provide users with stable green energy. It is suitable for residential and small commercial places with high electricity prices. The following is an introduction to the household energy storage projects of the Grevault household energy storage system.

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    Project background

    ①Project introduction

    Located in Baoshan District, Shanghai, with a construction area of 400㎡. The roof is divided into north and south sides, the north side is sheltered, and the south side is unsheltered. The usable area is about 90 square meters. The villa’s lines are aging, and there are frequent power outages during peak periods of electricity consumption.

    There are typhoons in summer, which may cause power outages in severe cases. The home has 24-hour surveillance and emergency lighting, and it will not work if the power fails; the owner plans to install central air conditioning and floor heating.

    In addition, new energy vehicles have been purchased and a charging pile has been installed, which has led to a sharp increase in household electricity consumption.

    ②Household electricity consumption

    Annual electricity consumption is 31,879 kWh. According to the peak and valley hours in Shanghai (peak hours 6:00~22:00, valley hours 22:00~6:00 the next day), the annual peak hours are 19,513 degrees and valley hours are 12,366 degrees.Household electricity consumption

    ③Shanghai electricity price

    Shanghai adopts the billing mode of “tiered electricity price”, and users can choose whether to “time-of-use pricing”. And there is a preferential policy of “multiple people in one household”. If the household registration is 5 or more, each household will increase the resident ladder electricity base by 100 kWh per month. The user has applied for the preferential policy of “multiple people in one household” and has chosen time-of-use billing. The annual electricity bill is about 22,000 RMB.

    ④ Photovoltaic subsidy policy

    As of 2021, China’s subsidy for household photovoltaics is 0.03 RMB/kWh for 20 years; the Shanghai municipal subsidy is 0.05 RMB/kWh for 5 years.

    This optimization wants to solve two problems:

    • Power outage risk: 24-hour monitoring and emergency lighting power supply cannot be guaranteed.
    • High electricity bills: There are many power-consuming equipment and high power consumption; the peak-to-valley price difference is large, and the third-tier cost is high.

    Scheme design

    ① Design ideas

    The residential area has four distinct seasons and sufficient sunlight, and the roof area on the south side is suitable without shelter. And users want to reduce electricity bills and ensure electricity safety.

    After comprehensive consideration, it is recommended to install an optical storage system to realize the two functions of “backup power supply” and “stepped time-of-use electricity price”.

    That is, it can ensure the continuous power supply of important loads during power outages; reduce the purchase of electricity, especially the electricity expenses of the third tier, and realize charging during valley hours and discharging during peak hours.

    ②Mainly selected products

    Grevault 51.2V 200AH Powerwall battery
    Grevault 51.2V 200AH Powerwall battery

    Battery: Grevault 51.2V 200AH Powerwall battery

    The main function of the battery:

    1) Continuous power supply for important loads

    The important loads of this project include monitoring, emergency lighting and refrigerators, etc. The user hopes that the battery can guarantee at least 8 hours of continuous power supply in case of power failure.

    2) Cut electricity bills

    The purpose is to reduce the peak electricity cost of the third step to zero, that is, to reduce the peak period from 20,000 degrees to less than 6,000 degrees through the photovoltaic storage system. Considering the actual consumption situation, in order to reduce 14,000 kilowatt-hours of electricity, usually PV power generation accounts for 55%, and battery power accounts for 45%.

    The battery needs to provide 6,000 kilowatt-hours of electricity per year, with an average of 16 kilowatt-hours of electricity per day. According to the calculation of 1.5 times of battery cycle per day, it is recommended that the user be equipped with a 10-degree battery.

    The battery needs to be highly compatible with the hybrid inverter. Therefore, the design uses Grevault 51.2V 200AH Powerwall battery.

    Project operation analysis

    Battery charge and discharge

    According to the comparison of power generation and electricity consumption, the working mode can be set separately according to the season.

    Winter and summer: high load power consumption

    Set “Economy Mode” (set the charging and discharging time period by yourself) ①The excess power of PV during the day is given priority to charging the battery. ②Buy electricity to charge the battery during off-peak hours at night, and discharge it during peak hours the next day.

    Spring: High PV power generation and low load power consumption

    Set “general mode” (photovoltaic power generation is given priority to supplying the load, the excess is charged to the battery, and the remaining power is finally connected to the grid), and after the PV fully charges the battery, it is discharged to the load during peak hours at night. There is no need to additionally set up valley hours to buy electricity.

    Buying and selling electricity comparison

    Comparing the electricity purchased before and after the installation of solar storage, it can be seen that the overall purchased electricity has been reduced, and even the maximum reduction is about 50% in summer.

    And through the adjustment of excess PV and peak and valley electricity prices by the battery, the electricity purchased during peak hours has been greatly reduced; the electricity purchased during off-peak hours has increased slightly, and basically remained stable.

    Earning calculation

    ①Comparison of electricity charges

    Before installation of photovoltaic storage: annual electricity consumption of 31,879 kWh (peak section 19,513 kWh, valley section 12,366 kWh), annual electricity fee 2,2000 RMB

    After installation of photovoltaic storage: only need to buy 19,383 kWh of electricity from the grid (4,830 kWh of electricity in the peak section, 14,552 kWh of electricity in the valley section), and the annual electricity cost is 9,100 RMBEarning calculation

    ②Revenue from electricity sales subsidy

    The income is divided into two parts: electricity sales and subsidies

    The electricity sales subsidy income is 1,257 RMB. The electricity bill was reduced from 22,000 RMB to 9,100 RMB, saving 12,900 RMB per year.

    The total annual saving is 14,157 RMB. However, there are variable factors in the long-term operation of the system, such as component and battery attenuation, operation and maintenance, etc., and the actual income will be slightly lower. The loss ratio can be set to 15%, and the actual annual income is about 12,000 RMB.

    (The above data are for reference only, the specific benefit analysis needs to be considered according to the actual situation of the project)


    In areas with tiered electricity prices and peak-valley electricity prices, solar-storage systems can effectively reduce electricity bills.

    When we design the optical storage system, especially when selecting the battery capacity, we can break the previous concept, no longer only choose the capacity according to the power demanded by the load, but consider how to minimize the electricity cost through the battery through the local electricity fee structure.

    This project cuts off the third tier of electricity charges, and at the same time shifts the peak electricity consumption to the valley hours as much as possible, and finally selects the most cost-effective 10-degree battery to maximize the reduction in electricity charges and recover energy storage costs as soon as possible.

    Project Consulting

    If you are interested in learning more about GreVault’s program, please complete and submit this form.

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