What This System Needs to Do
The client's facility operates both single-phase and three-phase loads simultaneously. Located in the Middle East, it faces daily grid outages of approximately four hours and requires a diesel generator backup for extended outages. The system must maintain continuous power — no exceptions.
Two Solutions — One Goal
We evaluated two fundamentally different architectures to meet these requirements. Both are hybrid-ready (PV + battery + diesel) and horizontally scalable — but they make different trade-offs between redundancy and simplicity.
3 × 10 kW Single-Phase Inverters in Parallel
Three parallel single-phase hybrid inverters deliver the total 30 kW across three phases. Each inverter runs independently with its own MPPT and battery module, connected to a shared PV array via DC distribution. A control box with ATS ensures seamless switching to the diesel generator.
- ✓High redundancy — if one inverter fails, 20 kW remains
- ✓Easier replacement (10 kW units are widely available)
- ✓Easier single-phase load distribution
- ✗More wiring and components
- ✗Higher installation complexity
- ✗Higher overall cost
Single 30 kW Three-Phase Inverter (100% Unbalance)
A single 30 kW three-phase inverter capable of 100% unbalanced load — behaving as three independent single-phase outputs in one device. Reduced cabling, simplified integration. SigEnergy's Gateway eliminates the need for a separate AC combiner box or hybrid controller.
- ✓Simpler installation and commissioning
- ✓Less wiring, fewer components
- ✓Gateway handles ATS, combiner, and hybrid control
- ✗If inverter goes offline, full 30 kW is lost
- ✗Requires hot spare for mission-critical redundancy
Three Operation Modes — 24/7 Supply
Despite the architectural differences, both solutions operate across the same three modes to maintain uninterrupted power at all times.
PV supplies loads first via MPPT. Excess PV generation charges the battery for use during outages. If PV output is insufficient, the grid supplements PV to supply loads and charge batteries simultaneously.
Inverter(s) switch to island mode. PV and battery jointly supply all loads. If PV is insufficient, battery discharges to maintain supply. When battery SOC drops below the configured threshold, the system automatically triggers Mode 3.
The PV-Diesel hybrid controller auto-starts the generator and seamlessly shifts the source for uninterrupted supply. Generator assists PV in supplying critical loads and charges batteries to a configured setpoint (e.g., 80% SOC) to maintain battery health.
N-Type TOPCon Bifacial Modules
For this project we selected N-Type TOPCon Bifacial modules in the 600–650 Wp range. TOPCon technology delivers higher efficiency and better temperature coefficients than standard PERC — important in high-ambient-temperature Middle East conditions.
Multiple Tier-1 manufacturers qualify: Trina Solar, Jinko Solar, JA Solar, LONGi, and others. We selected Trina Solar for this project based on combination of quality, availability in the local market, and competitive pricing among Tier-1 suppliers.
Five Brands — Which One Fits Your System?
The inverter is the heart of a hybrid solar system. We ran a thorough technical comparison across five brands for both solutions. Note: Huawei's 10 kW single-phase inverter does not support parallel operation, so we used the 10 kW three-phase model for Solution A. SigEnergy has no product for Solution A and is evaluated for Solution B only.
Solution A Candidates: Deye · GoodWe · Solis · Huawei
Solution B Candidate: SigEnergy
| Requirement | GoodWe | Deye | Huawei | Solis |
|---|---|---|---|---|
| AC Voltage Range (172–258V) | ✓ 170–280V | ✓ Meets | ✗ 211–264V | ✗ Does not meet |
| Power Factor (−0.8 to +0.8) | ✓ | ✓ | ✓ | ✓ |
| THD < 3% | ✓ | ✓ | ✓ | ✓ |
| AC High/Low Frequency Protection | ✗ Missing | ✗ Missing | ✓ | ✓ |
| DC Arc Fault Detection | ✗ Not built-in | ✗ Not built-in | ✓ | ✓ |
| Standards (VDE, IEC, UL1741SA) | ✗ No UL1741SA | ✗ No VDE/UL | ✓ Full compliance | ✓ |
| Efficiency ≥ 97% | ✓ | ✗ Below 97% | ✓ | ✓ |
| Built-in Battery Charger | ✓ | ✓ | ✗ Requires Power Module add-on | ✓ |
| Zero Export / Reverse Power | ✓ | ✓ | — | ✓ |
PVSyst Simulation Results — 30.30 kWp Array
We ran identical simulation conditions across all four Solution A inverters to compare real-world annual energy yield and performance ratio.
| Parameter | Huawei | GoodWe | Solis | Deye |
|---|---|---|---|---|
| PV Array (kWp) | 30.30 | 30.30 | 30.30 | 30.30 |
| Annual Yield (kWh/kWp) | 1,659 | 1,654 | 1,652 | 1,591 |
| Performance Ratio | 85.09% | 84.84% | 84.71% | 81.61% |
| Max Annual Energy (kWh) | 50,305 | 50,282 | 50,077 | 48,238 |
LFP Battery Comparison
We matched battery selection to inverter brand where possible for maximum compatibility. Note that Huawei and SigEnergy inverters are only compatible with their own proprietary batteries — no third-party options. GoodWe and Deye offer more flexibility.
All batteries are LFP chemistry with 5–10 kWh modules for scalability. All meet 6,000 cycles at 90% DoD — except SigEnergy which achieves 10,000 cycles.
| Requirement | SigEnergy | GoodWe | Deye | Huawei | BSL (Solis) |
|---|---|---|---|---|---|
| Cycle Life ≥ 6,000 | ✓ 10,000 | ✓ 6,000+ | ✓ 6,000+ | ✓ | ✓ |
| 75% Capacity after 15 Years | ✓ | ✓ | ✗ 70% EOL | ✗ 60% SOH | ✗ |
| Temp Range (−10 to +55°C) | ✓ −20 to +55 | ✓ −20 to +55 | ✗ Charge: 0–50°C | ✓ | ✗ Charge: 0–55°C |
| DoD ≥ 90% | ✓ 100% | ✓ | ✓ | ✓ 100% | ✓ |
| Efficiency ≥ 90% | ✓ | ✓ | ✓ | ✓ | ✓ |
| Self-Discharge ≤ 3%/month | ✓ | ✓ | ✓ | ✓ | ✓ |
Total System Cost Comparison
Prices below are based on a quantity of 50 complete systems, quoted in USD FOB China. Component counts vary by battery module size and inverter configuration.
| Brand | Inverter Model | Battery Model | Total (USD) |
|---|---|---|---|
| Deye | SUN-10K-SG02LP1-EU-AM3 × 3 | SE-G10.2 × 6 (10 kWh) | $10,311 |
| GoodWe | ES Uniq 10K × 3 | LX A5.0-30 × 12 (5 kWh) | $10,641 |
| Solis + BSL | S6-EH1P(3-10)K-L-PLUS × 3 | BSL B-LFP48-200E × 12 (5 kWh) | $11,712 |
| SigEnergy | SigenStor EC 30 TP × 1 | SigenStor BAT 10.0 × 6 (9 kWh) | $17,353 |
| Huawei | SUN2000-10K-MAP0 × 3 | LUNA2000-7-E1 × 9 (7 kWh) | $31,974 |
Summary Verdict
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