For installers
All-in-one vs a separate inverter and battery.
Both approaches store energy and provide backup. The difference is in the job: parts to source, connections to make, warranties to track and time on site. Here is the honest comparison.
| All-in-one (Sunpura) | Separate components | |
|---|---|---|
| Components to source | One integrated unit | Inverter + battery + BMS, often different brands |
| Wiring and connections | Fewer connections, factory-matched | More connections to make and test |
| Warranty | One warranty on the unit | Separate warranties per component |
| Commissioning | Faster, fewer settings to reconcile | Match and configure separate devices |
| Footprint | Compact stackable unit | Multiple boxes and mounts |
| Fault finding | One unit, one support line | Diagnose which component is at fault |
| Expansion | Add matched battery modules | Check compatibility across brands |
This compares approaches, not specific competitor products. We do not publish prices; the balance depends on the job and the customer's existing equipment.
The short version
For a new system, an all-in-one usually wins on install time, simplicity and single-warranty peace of mind. For a home that already has a capable inverter, an AC-coupled Sunpura battery adds storage without replacing what works. Either way, it is one supplier and one support line.
Common questions
Is an all-in-one always cheaper than separate components?
Not always on the sticker price, but the total cost of the job often favours all-in-one once you count the separate inverter, wiring labour, commissioning time and the risk of matching components. Where a customer already owns a compatible inverter, an AC-coupled battery can be the better value.
When do separate components still make sense?
When there is an existing, capable inverter that the customer wants to keep, or when a very specific, unusual configuration is needed. For that first case, Sunpura offers AC-coupled models that add storage to the existing inverter.
Can I still expand an all-in-one later?
Yes. The S2400 stacks to 9.6 kWh and the S4800 to 14.4 kWh by adding matched battery modules. Three units run in parallel, and six units reach 57.6 kWh (S2400) or 86.4 kWh (S4800) with the Sunpura parallel box, a separate product. Those six-unit figures assume every unit is fully stacked and are drawn across all three phases.
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