EM Series Solar Inverters: 2.5kW, 3.5kW, 8.5kW and 11kW
Specify the Right Solar Inverter for Your Next Project
The 1stess EM Series offers pure sine wave solar inverters with 220/230Vac output for solar distributors, importers, procurement teams and EPC contractors. With built-in MPPT solar charging, model-specific 12V, 24V or 48V battery configurations, and optional WiFi monitoring, the range supports residential solar power and appropriately sized small commercial backup power projects.
Choose the inverter around the actual load profile, PV array and battery system. The EM Series combines a power factor of 1.0 with support for battery-free operation, giving system integrators flexibility when planning compatible solar power configurations.
Request the model datasheet and a project-specific quotation.
Pure Sine Wave Output for Solar and Backup Power Systems
EM Series inverters deliver 220/230Vac ±5% output at 50/60Hz. Published peak efficiency is 96% from PV to inverter and 93% from battery to inverter. These are peak values, not guaranteed efficiency under every operating condition.
For EPC contractors and solar installers, capacity selection should account for continuous demand, appliance starting loads and available battery discharge current. The published transfer time is 10ms for the personal-computer setting and 20ms for the home-appliance setting; assess whether connected equipment tolerates the specified interruption.
Built-in MPPT Solar Charging
The integrated MPPT solar charger supports PV array design within the selected model's voltage, current and power limits. The maximum PV open-circuit voltage is 500Vdc. The 8.5kW and 11kW models list two solar inputs, with maximum PV array power of 2 × 5,000W and 2 × 5,500W respectively.
Check cold-weather string open-circuit voltage, operating voltage and input current before finalizing a bill of materials. PV input power and inverter AC output power are different ratings and should not be used interchangeably.
LiFePO4 Battery Integration and Optional Monitoring
The EM Series supports lithium battery communication through RS485. Select a compatible LiFePO4 battery with the correct nominal system voltage, BMS protocol, charge settings and discharge capability. RS485 availability alone does not guarantee compatibility with every battery brand.
Battery-free operation is supported, subject to suitable source availability and system configuration. Optional WiFi monitoring can be specified during procurement. Output-priority modes listed in the catalogue include UTL, SOL, SBU and SUB; confirm the mode settings for the intended installation.
Compare EM Series Models
| Specification | EM2500-12L | EM2500-24L | EM3500-24L | EM8500-48L | EM11000-48L |
|---|
| Rated capacity | 2.5kVA / 2.5kW | 2.5kVA / 2.5kW | 3.5kVA / 3.5kW | 8.5kVA / 8.5kW | 11kVA / 11kW |
| Battery voltage | 12Vdc | 24Vdc | 24Vdc | 48Vdc | 48Vdc |
| Surge power | 5,000VA | 5,000VA | 7,000VA | 17,000VA | 22,000VA |
| Maximum PV array power | 3,000W | 3,000W | 4,000W | 2 × 5,000W | 2 × 5,500W |
| MPPT voltage range | 50-500Vdc | 60-500Vdc | 60-500Vdc | 60-500Vdc | 60-500Vdc |
| Maximum PV open-circuit voltage | 500Vdc | 500Vdc | 500Vdc | 500Vdc | 500Vdc |
| Maximum solar input current | 15A | 15A | 15A | 2 × 18A | 2 × 18A |
| Maximum solar charge current | 120A | 100A | 100A | 140A | 160A |
| Maximum AC charge current | 120A | 60A | 80A | 120A | 120A |
| Maximum combined charge current | 120A | 100A | 100A | 140A | 160A |
| Lithium battery activation | PV or utility | PV only | PV or utility | PV or utility | PV or utility |
| Parallel capability | No | No | No | No | No |
Shared specifications: pure sine wave; 220/230Vac ±5% output; 50/60Hz output; IP21; optional WiFi; RS232 and RS485 communication. The 8.5kW and 11kW models additionally list a dry contact. Published operating temperature: -10°C to 55°C.
Applications for Importers and EPC Contractors
- Residential solar power: Match the selected inverter with a correctly designed PV array and compatible battery to serve specified household circuits.
- Small commercial backup power: Evaluate shops, offices and other modest commercial loads against continuous output, starting demand and battery capacity.
- Solar distribution portfolios: Offer clearly differentiated 2.5kW, 3.5kW, 8.5kW and 11kW configurations with model-specific technical documentation.
- Off-grid solar system planning: Assess PV production, storage autonomy and alternative source availability against the site's daily energy needs. Confirm the intended operating configuration with the technical team.
The 220/230Vac range is relevant to projects designed around that output voltage. Market suitability also depends on local electrical rules and the documentation required by the destination country. Do not assume suitability for 120V or split-phase applications.
Installation and Procurement Considerations
The IP21 enclosure should be used in an appropriate protected indoor installation with the ventilation and clearances specified in the installation manual. A detachable dust cover does not make the inverter waterproof or suitable for exposed outdoor mounting.
Before ordering, provide the required power rating, destination market, load list, PV module data and battery specifications. Confirm monitoring options, manuals, available compliance documents, warranty terms, delivery schedule and packaging in the quotation.
The published EM Series table states that parallel operation is not supported. Grid connection as an AC source should not be interpreted as approval for exporting electricity to the utility grid.
Frequently Asked Questions
Which battery voltage does each model use?
The EM2500-12L uses 12Vdc. The EM2500-24L and EM3500-24L use 24Vdc. The EM8500-48L and EM11000-48L use 48Vdc.
Can the EM Series work without a battery?
The catalogue lists battery-free operation. Confirm source availability, load behavior and operating settings for the proposed configuration.
Is WiFi included as standard?
WiFi is optional and should be specified when ordering.
Can multiple EM Series inverters operate in parallel?
No. The published specification table lists no parallel capability.
Can it communicate with a LiFePO4 battery?
The catalogue lists RS485 lithium battery communication. Confirm the battery's protocol and electrical compatibility before procurement.
Is the EM Series suitable for outdoor installation?
Its stated protection rating is IP21. Specify an appropriate protected indoor installation and follow the installation manual.
Request Specifications for Your Solar Project
Tell 1stess your required inverter capacity, destination market, PV configuration and battery voltage. Request a model-specific datasheet and quotation for your solar distribution or EPC project.
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