If the standard 5kWh or 10kWh home battery feels like “small change” for your energy needs, Swatten is likely the brand on your radar. While names like Sofar and Sungrow dominate the entry-level market, Swatten (by Sieyuan Electric) has carved out a niche for massive, high-voltage residential and light commercial setups.
We’re moving past “keeping the lights on” and into “running the whole estate” territory. Let’s look at the specs and costs for these heavy-hitters.
The Lineup: Massive Storage, Flexible Power
The core of the Swatten appeal is their ability to pair high-output hybrid inverters with massive battery banks—stretching all the way up to 51.2kWh. To put that in perspective, the average home uses about 15–20kWh a day. These systems can theoretically run a home for two to three days on a single charge.
Single-Phase (SH Series) vs. Three-Phase (TH Series)
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SiH-5kW/10kW-SH: These are single-phase workhorses. They are perfect for large standard homes that want massive storage (44.8kWh) but don’t have three-phase power connected.
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SiH-10kW-TH to 30kW-TH: These are three-phase inverters. If you have heavy machinery, large ducted AC units, or workshop tools, these deliver the balanced high-voltage output you need.
Pricing & Configuration Breakdown
Note: Prices are estimated based on full system kits including the inverter and the specified battery capacity.
| System Model | Inverter Output | Battery Capacity | Estimated Price (USD) |
| SiH-5kW-SH | 5kW (Single Phase) | 44.8kWh | $14,800 |
| SiH-10kW-SH | 10kW (Single Phase) | 44.8kWh | $15,600 |
| SiH-10kW-TH | 10kW (Three Phase) | 51.2kWh | $15,600 |
| SiH-10kW-TH-PRO | 10kW (Premium 3-Ph) | 51.2kWh | $17,400 |
| SiH-15kW-TH | 15kW (Three Phase) | 51.2kWh | $17,800 |
| SiH-20kW-TH | 20kW (Three Phase) | 51.2kWh | $18,300 |
| SiH-25kW-TH | 25kW (Three Phase) | 51.2kWh | $18,500 |
| SiH-30kW-TH | 30kW (Three Phase) | 51.2kWh | $18,600 |
Key Technical Advantages
1. “Whole-Home” Backup Power
Unlike many hybrid systems that only power “essential” circuits (fridge, a few lights), the TH-PRO and higher-wattage TH models are designed for whole-home backup. With a <4ms switching time on the three-phase models, your sensitive electronics won’t even flicker when the grid drops.
2. High-Voltage (HV) Efficiency
Swatten uses high-voltage battery architecture (typically 100V to 800V ranges). This is more efficient than low-voltage 48V systems because it reduces energy loss during the DC-to-AC conversion. You get more of the power you paid for.
3. Industrial-Grade Heritage
Swatten is backed by Sieyuan Electric, a company with 30+ years of experience in utility-scale power grids. This “industrial DNA” shows up in their build quality—IP66 ratings (better than the standard IP65) and fanless, die-cast designs that stay quiet even under load.
Is a 50kWh+ System Right For You?
Investing $18,000+ is a significant jump. You should consider these high-capacity Swatten systems if:
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You have a huge solar array: If you have 15kW–30kW of panels on your roof, a standard 10kWh battery will be full by 10:00 AM. You need the 51.2kWh capacity to soak up that excess.
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Off-Grid Ambitions: While these are hybrid systems, a 50kWh bank provides enough “buffer” to make off-grid living a realistic possibility.
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EV Charging: If you plan to charge two EVs at night using only stored solar energy, you need this level of capacity.