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Home batteries come in different architectures: modular systems you build up from smaller units, and all-in-one systems with fixed capacity. Here's what matters when choosing between them.
Specifications and pricing may vary. Always confirm current details with your installer.
Home battery systems generally follow one of two design philosophies. Each has genuine advantages and trade-offs - neither is universally "better."
Built from smaller units that combine to create your total capacity. You might start with two or three modules and add more later.
Characteristics:
Complete systems with fixed capacity in a single unit, often including an integrated inverter.
Characteristics:
Related to the modular vs all-in-one question is how the battery connects to your solar system:
The battery connects on the AC side of your electrical system, after your solar inverter. This means it can work with any existing solar installation. Many modular battery systems are AC-coupled.
The battery connects on the DC side, before conversion to AC power. This typically requires a compatible hybrid inverter. Many all-in-one systems include their own hybrid inverter.
If you have existing solar, AC-coupled systems often retrofit more easily. If you're installing new solar or replacing your inverter anyway, DC-coupled systems may be more efficient.
Power output (measured in kW) determines how much electricity the battery can deliver at once. This matters for:
All-in-one systems often have higher power output per unit of capacity, which can be important if you need to run high-power appliances. Modular systems scale their power output with the number of modules - more modules typically means higher total power.
Modular systems advertise future expansion as a key benefit. However, expansion isn't always straightforward:
If you're confident you'll want more capacity later, ask your installer specifically about the expansion process and estimated costs. "Can expand" is different from "will be cost-effective to expand."
Battery warranties vary in length (typically 10-15 years) and terms. Some key things to understand:
A longer warranty isn't automatically better if the terms are more restrictive. Read the details or ask your installer to explain them.
"What's the total usable capacity and power output of this configuration?"
Ensure you're comparing like with like across different systems.
"Is this AC-coupled or DC-coupled, and what does that mean for my existing solar?"
Understand any changes needed to your current system.
"What would expansion look like, and what would it cost?"
If modularity matters to you, understand the practical reality.
"What's the warranty, and what exactly does it guarantee?"
Look beyond the number of years to understand the actual terms.
"Does this system support backup power, and what's included?"
Backup capability depends on system design, not just battery model.
"Why do you recommend this approach for my situation?"
Your installer should have specific reasons based on your requirements.
The choice between modular and all-in-one systems depends on your specific situation. Consider:
Your installer's recommendation should be based on your specific requirements, existing system, and goals - not on brand preference or what they have in stock.
Our quiz helps you understand what factors matter most for your situation, so you can evaluate different approaches effectively.
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