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DC-coupled modular batteries work with hybrid inverters and offer flexible sizing through stackable modules. Here's what to consider when comparing options in this category.
Specifications and pricing may vary. Always confirm current details with your installer.
DC-coupled batteries connect directly to a hybrid inverter on the DC (direct current) side, before electricity is converted to AC for household use. The modular approach means you build capacity from stackable modules - typically 2-8 modules that combine to create your total system.
This architecture requires a compatible hybrid inverter. Some battery manufacturers make their own inverters; others are designed to work with inverters from multiple brands. The inverter choice significantly affects system performance and capabilities.
Different modular systems use different module sizes. Some use smaller modules (2-3kWh each), allowing more precise capacity matching. Others use larger modules, which may mean less granular sizing options.
Consider what capacity you actually need and how close each system can get to that target. Also consider whether you might want to expand later, and what that would involve.
What to compare:
Module size, minimum and maximum configurations, and the capacity steps available.
With modular systems, power output typically scales with the number of modules. More modules usually means higher maximum power, but the relationship varies by system.
This matters for charging speed (can you capture all your excess solar?), discharge capability (can you run your intended loads?), and backup power (if applicable).
What to ask:
"What's the power rating at my planned module count, not just the maximum with a full stack?"
DC-coupled batteries need compatible hybrid inverters. Some batteries work with a wide range of inverter brands; others are designed primarily for their own brand's inverters.
If you already have a hybrid inverter, check compatibility. If you're buying new, consider whether you want flexibility to change components in future, or prefer an integrated single-brand solution.
What to ask:
"Which inverters does this battery work with? What inverter are you recommending and why?"
If you're interested in participating in Synergy's Virtual Power Plant program, confirm that your specific configuration (battery model, inverter, and module count) is eligible. VPP compatibility depends on the complete system, not just the battery.
Different installers have different experience with various battery and inverter combinations. An installer who has installed many of a particular system will typically provide better outcomes than one installing their first unit.
Battery manufacturers have different support structures in Australia. Some have direct Australian offices with local support teams; others work through distributors. Neither model is inherently better, but understanding the support structure helps you know what to expect if you have issues.
Modular systems advertise future expansion as a key benefit. However, expansion isn't always as simple as "add more modules":
If expansion is part of your plan, discuss this specifically with your installer. Understand what expansion would actually involve and cost, not just that it's theoretically possible.
"What's the total usable capacity at my planned module count?"
Ensure you're comparing the specific configurations being quoted.
"What's the charge and discharge rate at this configuration?"
Power ratings often scale with module count - understand your specific system.
"Which inverter are you recommending and why?"
The inverter choice significantly affects system capabilities.
"How many of this specific configuration have you installed?"
Installer experience with your specific system matters.
"What would it cost to add modules in 2-3 years?"
If expansion matters, understand the practical reality.
"Is this configuration eligible for Synergy's VPP program?"
Confirm specific eligibility, not just brand compatibility.
When comparing DC-coupled modular batteries, focus on your specific requirements rather than brand comparisons. Consider what capacity and power you need, what inverter makes sense for your situation, and what your installer has experience with.
Get quotes for comparable configurations and compare the complete packages - including the inverter, installation, warranty terms, and support arrangements. Your installer's recommendation should be based on your specific situation, not just brand preference.
Our quiz helps you understand what factors matter most for your situation, so you can ask the right questions when comparing systems.
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