Est une batterie de 10 kW suffisante pour faire fonctionner une maison?

Est une batterie de 10 kW suffisante pour faire fonctionner une maison?

When you’re exploring home energy storage, one of the first questions is always about size and capacity. You see numbers like "10kW" and wonder, "Is that enough to run my house during a power outage?" It’s a crucial question, and the answer depends on what you want to power and for how long.

D'abord, let’s clarify a key term. A battery’s power is in kilowatts (kW), but its energy storage capacity is in kilowatt-hours (kWh). When people ask about a "10kW battery" for runtime, they almost always mean a 10kWh battery. A 10kWh battery is often enough to run a home’s essential loads—like lights, réfrigérateur, and internet—for many hours or overnight. Cependant, it is generally not enough to run an entire house, especially with heavy loads like high-power air conditioning, pendant une période prolongée.

À Gycx Solaire, we specialize in designing batterie domestique empilable systems that are perfectly sized for our clients’ needs, whether it’s for essential backup during a typhoon or for maximizing solar energy savings. Let’s dive into details.

What are stacked batteries?

You’ll often hear modern energy storage solutions referred to as "stacked" or "stackable" batteries. What does this mean, and how is it different from a single, standalone battery?

Stacked batteries, or "stackable batteries," are modular energy storage units specifically engineered to be physically placed together and electrically interconnected to form a larger, Banque de batterie unifiée. Each module is a self-contained battery (often using safe LFP lithium chemistry with its own BMS) that acts as a building block. This design allows you to easily scale your system’s capacity by adding more modules, creating a customized and future-proof energy solution.

Plonger plus profondément: La puissance de la conception modulaire

Le concept de batterie domestique empilable is built on several key principles:

• Modularité: Chaque unité de batterie est un module standardisé (Par exemple, 5kWh). This allows you to start with the capacity you need now and add more later.
• Évolutivité: C'est le principal avantage. If you buy an electric vehicle in the future, you can simply add another battery module to your stack instead of replacing the entire system.
• Engineered for Safety: These modules are designed with features for secure physical stacking (like interlocking casings or rack mounting) and have protected terminals for safe electrical connection.
• Intégration intelligente: Each module has its own Battery Management System (GTC), and they are designed to communicate with each other and your solar inverter to operate as a single, intelligent, and highly efficient battery bank.

Cette approche, which we utilize at Gycx Solar, provides our customers with a flexible and cost-effective path to energy independence.

How long will a 15kWh battery last?

Understanding runtime is key to sizing your battery. If a 10kWh battery isn’t quite enough for a whole house, how much more time does a larger 15kWh battery give you?

UN 15kWh battery stores 50% more energy than a 10kWh battery, so it will last 50% longer while powering the same household loads. Par exemple, if a collection of essential appliances drawing 500 watts would drain a 10kWh battery in about 20 heures, that same load would be powered by a 15kWh battery for approximately 30 heures.

Plonger plus profondément: A Practical Runtime Comparison

Let’s look at the math with some common household loads in South Korea:
La formule: Temps d'exécution (Heures) = Capacité de la batterie (in Wh) / Charger (en watts)

• A 10kWh battery = 10,000 Wh
• A 15kWh battery = 15,000 Wh

Comme vous pouvez le voir, that extra 5kWh of capacity in a 15kWh system makes a significant difference. It can be the margin you need to run your air conditioner for a few comfortable hours during a hot summer night outage or give you an extra day of security. Sizing up with a batterie domestique empilable system is easy – it’s often as simple as adding one more module.

Are power stack batteries worth it?

Is investing in a modular, stackable battery system—a "power stack"—a smart financial decision? Does the benefit of having this scalable backup power and solar storage justify the cost?

Oui, for most homeowners, a stackable battery system is an excellent investment. The value comes from three key areas:

1. Épargne financière: By storing excess solar energy to use during peak-rate evening hours, you can significantly reduce your electricity bills from providers like KEPCO.
2. Sécurité énergétique: It provides invaluable peace of mind and seamless backup power during outages caused by typhoons or other grid issues.
3. Future-Proof Flexibility: The ability to easily add more capacity later protects your initial investment and allows the system to adapt to your changing energy needs.

Plonger plus profondément: The Return on Investment

Let’s look at the value proposition:

• Bill Reduction: A battery allows you to maximize "solar self-consumption." Instead of selling your excess solar power to the grid, you store it and use it yourself when electricity is most expensive. This direct offset is the fastest way to see a return on your solar and battery investment.
• Alimentation de secours: What is the cost of a power outage? For a family, it could mean spoiled food, no lights, and no internet. For someone working from home, it means lost productivity. A battery provides seamless, silent, and automatic power the moment the grid fails.
• Évolutivité: This is a unique benefit of the stackable design. You don’t have to buy a massive, oversized system today. You can start with a 10kWh system and, if you later purchase an electric vehicle or install an air conditioner, you can simply have a professional add another 5kWh or 10kWh module. This makes energy storage more accessible and adaptable.

Gycx Solar Story: "A client in Seoul was hesitant about the cost of a large battery. We installed a starter 10kWh stackable system. A year later, they bought an EV. The upgrade was simple and cost-effective – we just added a second 10kWh module to their existing setup. They loved the flexibility."

What is the 80 20 rule for lithium batteries?

You may have heard of the "80/20 règle¹" for charging phones or laptops and wondered if it applies to large home batteries. What is this rule, and is it important for your battery’s health²?

The "80/20 rule," more accurately called the "20-80 rule," is a guideline for maximizing the cycle life of some types of lithium-ion batteries. It suggests that for daily use, you should try to keep the battery’s state of charge entre 20% et 80%. Avoiding the extremes of a full 100% charge and a deep 0% discharge can reduce stress on the battery and help it last longer.

Plonger plus profondément: A Best Practice for Battery Longevity

Here’s a closer look at the rule and how it applies to a batterie domestique empilable:

• Why it Works: Lithium-ion batteries experience the most chemical and mechanical stress when they are at very high or very low voltages, which correspond to being nearly full or nearly empty. Operating in the "sweet spot" in the middle is gentler on the internal components, leading to a longer overall lifespan.
• Is it Necessary for LFP? This rule is most critical for chemistries like NMC, which are common in consumer electronics. Le LFP (Phosphate de fer au lithium) chemistry used in the best home battery systems is much more robust and tolerant of being charged to 100%. Cependant, the underlying principle that shallower cycles are less stressful than deeper cycles still holds true.
• How Modern Systems Handle It: The great news is that you don’t have to manage this manually! A modern BESS from Gycx Solar allows you to program these limits directly into the system’s software. A common and highly effective setting is:
  • Set a Backup Reserve: You can tell the system, "Never discharge below 20% during normal daily use; save that 20% for a power outage." This automatically prevents deep daily discharges and guarantees you always have a power reserve.
  • The system will then cycle between your reserve level (Par exemple, 20%) et 100% tous les jours, which is perfectly safe and normal for durable LFP batteries. This gives you the best of both worlds: maximum use of your solar energy and a protected backup reserve, all while promoting a long and healthy life for your battery.

A 10kWh battery is a powerful starting point for home energy storage, but its true potential is unlocked in a modular, batterie domestique empilable système. This approach provides the flexibility to size your system perfectly, the security of long-lasting LFP technology, and the value of a future-proof investment. By understanding best practices like the 20-80 règle³, you can ensure your system serves you reliably for years to come.

If you have more questions about sizing a battery for your home or want to explore the benefits of a scalable system, Notre équipe d'experts de GYCX Solar est là pour aider. Contactez-nous pour une consultation professionnelle!