What size solar battery do I need for my home?

As the demand for home energy management increases, energy storage batteries have become the core equipment for reducing electricity bills and ensuring power supply. However, facing professional parameters such as "5kWh" and "10kWh", many users fall into "capacity anxiety": insufficient capacity leads to power outages at critical moments, and excess capacity causes a waste of funds. As an energy storage expert serving more than 100,000 households worldwide, GreenMore has refined a set of scientific selection methodologies suitable for home users based on its self-developed AI energy efficiency model and real project data.

• Demand Diagnosis

1. Construction of basic electricity consumption profile

Daily average power consumption statistics: Use the "Household Power Consumption Recorder" provided by GreenMore to record the power and usage time of major loads such as air conditioners, refrigerators, and lighting for 7 consecutive days (example: the average daily power consumption of a family of three in summer is about 25kWh)

Peak-valley electricity price strategy matching: Taking the US PG&E electricity price as an example, the peak electricity price is 0.52/kWh, and the valley electricity price is only 0.18/kWh. The energy storage battery needs to cover 60%-80% of the peak electricity consumption

Off-grid demand classification

1. Basic guarantee: guarantee key loads such as refrigerators, lighting, and networks (recommended configuration ≥3kWh)
2. Comfortable life: Add high-power equipment such as water heaters and air conditioners (recommended configuration ≥ 8kWh)
3. Whole-house self-supply: 100% off-grid operation (recommended configuration ≥ 80% of the average daily electricity consumption)

2. Key parameter calculation formula

Basic capacity formula:

Basic capacity (kWh) = battery discharge depth (DoD) × system overall efficiency daily average key load power consumption (kWh) × backup days

Depth of Discharge (DoD): 80% is recommended (GreenMore products support 90% depth of discharge, but a safety margin must be reserved)

System efficiency: Considering inverter loss, cable loss, etc., the value is 0.85-0.92

Example calculation:

A household's daily critical load power consumption is 12kWh, and a 2-day backup is required. Then: 0.8×0.912×2≈33.3kWh

It is recommended to choose GreenMore 20kWh household high-voltage battery series (modular design, support for later expansion)

• Product Matching

1. Home Energy Storage System Selection Matrix

2. Scalability design considerations

GreenMore patented technology: uses standard 10-foot container energy storage units (100kWh/module), supports flexible combination of 1-10 modules

Example upgrade paths:

1. Phase 1: Install 10kWh wall-mounted battery to cover nighttime lighting + refrigerator power
2. Phase 2: 3 years later, 15kWh stacked batteries will be added to enable free power consumption of high-power appliances such as air conditioners
3. Phase 3: Connect to the photovoltaic system in 5 years and build a photovoltaic storage and charging integrated microgrid

• Selection Guide

1. Avoid the "capacity first" trap

1. Battery life reduction: Overload operation can shorten the cycle life by more than 30%
2. Economic calculation: Compare the 10-year total cost of ownership (TCO) of a 5kWh/10kWh system using the GreenMore ROI calculator

2. Be wary of "low-price, low-quality" products

1. BMS system differences: inferior BMS may lead to overcharge/overdischarge, causing thermal runaway risk
2. Certification system: Prioritize products that have passed UL9540A and IEC62619 certification (GreenMore's entire product line has passed 16 international certifications)

3.Emphasis on "system compatibility"

1. Inverter matching: ensure that the battery and inverter power curves are 100% compatible (GreenMore provides an inverter selection database)
2. Grid protocol: Supports VPP virtual power plant dispatch, demand response and other smart grid functions

• Decision Support Tools

1. Capacity calculator: Enter parameters such as home area, appliance list, etc., and generate a recommended plan in 3 minutes
2. 3D space simulator: Visually display the battery installation location and wiring plan
3. Regional electricity price map: Integrate time-of-use electricity price data from more than 100 regions around the world to optimize charging and discharging strategies

Energy storage battery selection is a key decision for household energy transformation. GreenMore has helped households around the world reduce 37% of energy storage investment risk through the three-dimensional evaluation system of "demand diagnosis-product matching-economic calculation". Log in to the official website www.gmsolarkit.com immediately to obtain your exclusive "Home Energy Storage Configuration Report" to accurately match every kilowatt-hour of electricity to your life needs and jointly build a zero-carbon smart home.