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Discover the GREATSUNPV 8.5kW/11kW off-grid inverter with dual MPPT trackers, lithium battery activation (PV/Utility), and RS485 BMS communication. 94% efficiency, pure sine wave, and battery-free support for homes and businesses.
Brand Name:
GREATSUNPVType:
8.5W/11kWMax. Power:
11kWAC Voltage:
220/230/240VACWarranty:
10Ingress Protection:
IP21Dimensions:
540×415×122 mmCertification & Safety Standard:
RS485/DRY CONTACT8.5kW / 11kW Dual MPPT Off Grid PV Inverter With Grid-Tie Ready
The GREATSUNPV High-Power Series (models GSOF-8548 and GSOF-11048) represents a significant leap in off-grid solar technology. Engineered for larger residential estates, small commercial sites, and advanced energy storage systems, these 8.5kW and 11kW inverters go beyond standard off-grid functionality.
Combined with dual MPPT trackers, Lithium Battery BMS communication (RS485), and an intelligent Lithium Battery Activation function (via PV or Utility), these inverters offer a future-proof, highly efficient (94% peak) power solution. Whether you are upgrading an existing system or designing a new hybrid setup, the GSOF High-Power Series delivers robust performance with sophisticated electronic protections and an intuitive LCD interface.
Grid-Tie Operation (Feed-in/Backup Ready) – Supports utility-parallel operation for net-metering or self-consumption optimization, maximizing your return on solar investment.
Dual MPPT Solar Chargers – Equipped with two independent MPPT trackers (18A each), allowing flexible solar panel orientation (e.g., East/West roofs) to harvest more energy throughout the day.
Lithium Battery BMS Communication (RS485) – Direct digital communication with lithium batteries ensures precise voltage/current control, prolonging battery life and enhancing safety.
Lithium Battery Activation (No Manual Start Needed) – Automatically wakes up dormant lithium batteries using solar PV or utility power, eliminating complicated manual startup procedures.
Pure Sine Wave Output with High Surge Capacity – Delivers 8.5kW/11kW continuous power and massive surge power (17kVA / 22kVA) to reliably start heavy inductive loads like air conditioners, pumps, and compressors.
Ultra-High Peak Efficiency (94%) – Reduces energy loss during conversion, saving more solar power for actual use.
Wide PV Input & Dual Charging – MPPT range of 60–450VDC, max PV array open-circuit voltage of 500VDC, with combined solar charge current up to 140A (8.5kW) or 160A (11kW), plus a 120A AC charger for fast backup.
Intelligent Overload Protection – Precisely timed protection profiles (e.g., 270s at 101%~109% load) prevent nuisance tripping while ensuring system safety.
Comprehensive Protections & LCD Display – Built-in overvoltage, overcharge, over-discharge, short-circuit, and thermal protections, all monitored via a clear LCD screen.
| Advantage | Benefit |
|---|---|
| Grid Flexibility | Operate off-grid, or hybrid – adapt to changing utility policies and energy needs. |
| Smart Battery Management | Native RS485 communication supports popular lithium brands; auto-activation saves time and hassle. |
| Optimized Solar Harvesting | Dual MPPT design minimizes shading losses and maximizes daily energy yield. |
| Heavy-Duty Performance | High surge power (up to 22kVA) handles large motors and workshop equipment with ease. |
| Fast & Safe Charging | Up to 160A solar charging + 120A AC charging drastically reduces battery downtime. |
| Low Operating Costs | 94% efficiency means more usable power and less heat dissipation. |
Large Residential Villas – Power multiple air conditioners, electric ovens, and home entertainment systems simultaneously during outages.
Small Farms & Agricultural Operations – Run irrigation pumps, ventilation fans, and milking machines reliably using solar + grid backup.
Small Commercial Shops & Workshops – Keep refrigerated displays, power tools, and lighting operational without interruption.
Hybrid Solar-Storage Systems – Integrate with lithium batteries and the utility grid to reduce peak-time electricity bills via self-consumption.
Telecom Towers & Remote Stations – Provide stable 48V battery backup and AC power for critical communication infrastructure.
This series supports multiple operating modes, as illustrated in the system diagram:
Additionally, the RS485 dry contact interface allows seamless integration with external monitoring systems and generator auto-start modules.
| Model | GSOF-8548 | GSOF-11048 | |
| Rated power | 8.5KVA/8.5kW | 11KVA/11kW | |
| Maximum PV Input Power | 10kW | 11kW | |
| Parallel Capability | NO | ||
| Lithium Battery Activation | YES(By PV or Utility) | ||
| Lithium Battery Communication | YES(RS485) | ||
| Input | Nominal Voltage | 230VAC | |
| Acceptable Voltage Range | 170-280VAC(PC);110-280VAC(Home appliance) | ||
| Frequency | 50/60 Hz(Adaptive) | ||
| Output | Nominal Voltage | 220/230/240VAC | |
| Surge Power | 17000VA | 22000VA | |
| Frequency | 50/60 Hz | ||
| Waveform | Pure Sine wave | ||
| Transfer Time | 10ms(PC);20ms(Home appliance) | ||
| Peak Efficiency | 94% | ||
| Overload Protection | 270Se≥101%~109% load; 85@≥110%~140% load; 35@≥150% load |
||
| Grid-tie Operation | Yes | ||
| Battery | Battery Voltage | 48VDC | 48VDC |
| Maximum Discharge Current | 180A | 220A | |
| Floating Charge Voltage | 54VDC | 54VDC | |
| OverCharge Protection | 63VDC | 63VDC | |
| Charging Method | CC/CV | ||
| Solar Charger & AC Charger |
Solar Charger Type | MPPT | |
| Max.PV Array Power | 5000W*2 | 5500W*2 | |
| Max.PVArray Open Circuit Voltage | 500VDC | 500VDC | |
| PV Array MPPT Voltage Range | 60VDC~450VDC | 60VDC~450VDC | |
| Max.Solar Input Current | 18A*2 | 18A*2 | |
| Max.Solar Charge Current | 140A | 160A | |
| Max.AC Charge Current | 120A | 120A | |
| Max.Charge Current | 140A | 160A | |
| General Data | Dimensions,D×W×H(mm) | 540*415*122 | 540*415*122 |
| Net Weight(Kgs) | 14 | 15 | |
| Communication Interface | RS485/DRY CONTACT | ||
| LCD | YES | ||
| Environment | Operating Temperature Range | -10℃~+50℃ | |
| Storage temperature | -15℃~+50℃ | ||
| Humidity | 5%-95% Relative Humidity(Non-condensing) | ||
Q1: What exactly does "Grid-Tie Operation" mean on this off-grid inverter?
It means the GS0F High-Power Series can synchronize with the utility grid to support your loads. In hybrid mode, it prioritizes solar and battery power, using the grid only as a backup or to charge batteries. In certain regulatory environments, it can also feed excess solar energy back into the grid (net-metering). Please consult your local utility for feed-in permissions.
Q2: How does the Lithium Battery Activation work?
If your lithium battery enters "sleep" mode (BMS protection), the inverter automatically sends a wake-up signal via the PV input or the AC utility input. This means you don't need to manually press a reset button on the battery – the system handles it automatically when sunlight or grid power is available.
Q3: Why does this model have two MPPT trackers?
The dual MPPT trackers (each with 18A input) allow you to connect two separate solar arrays with different orientations (e.g., East-facing and West-facing) or different tilt angles. This maximizes total energy harvest throughout the day compared to a single tracker, especially in partially shaded conditions.
Q4: Can I use lead-acid batteries instead of lithium?
Yes. The inverter supports standard 48V lead-acid, AGM, and Gel batteries. However, if you use lithium batteries, we highly recommend connecting the RS485 communication cable to enable BMS data exchange, which significantly improves charging accuracy and battery lifespan.
Q5: What is the benefit of the high surge power (17kVA / 22kVA)?
Many heavy appliances, such as air conditioners, deep-well pumps, and refrigerators, draw 3 to 5 times their rated current when starting. The high surge capacity ensures these motors start smoothly without tripping the inverter, making this series ideal for full-house backup.
Q6: The overload protection has specific timers (e.g., 270s at 109%). What does that mean?
The inverter does not trip immediately on slight overloads. For example, if you run at 105% load, it will sustain that for 270 seconds before shutting down, allowing brief power spikes to pass. This prevents nuisance tripping while still protecting the hardware from prolonged overloading.
Q7: How do I monitor the inverter remotely?
You can connect the RS485 port to an external data logger or a Wi-Fi/4G monitoring module (sold separately). The dry contact interface can also be used to trigger external alarms or auto-start a backup generator when battery voltage drops.
Q8: What is the maximum PV input voltage I must not exceed?
The absolute maximum PV open-circuit voltage (Voc) is 500VDC. Exceeding this will permanently damage the MPPT charger. Always calculate your string Voc at the lowest expected ambient temperature to ensure it stays safely below 500VDC.
GREATSUNPV is a trusted manufacturer of high‑performance solar energy equipment, committed to innovation, quality, and customer satisfaction. All products undergo rigorous testing to meet international standards, ensuring long‑term reliability and safety for your energy independence journey.
For more information on this product or to place an order, please contact us：
Email: info@greatsunpv.com
whatsapp: +86 189 1960 5188
Web: www.guruidepv.com
Copyright @ Hefei Guruide New Energy Technology Co., Ltd. 
IPv6 network supported
