STUDER AJ Series Pure Sine Wave Inverters
High-quality inverters for industrial and domestic applications, manufactured in Switzerland.
Introduction
The Studer AJ series pure sine wave inverters convert battery voltage into high-quality 230/120Vac, suitable for all electrical appliances. Designed to meet industrial and domestic needs, the AJ series offers an optimal solution for standalone applications, ensuring comfort, safety, and reliability. Manufactured in Switzerland, these inverters are delivered with AC and battery cables, providing a true ‘plug and forget’ solution.
Key features include high and steady efficiency, outstanding overload capabilities, digital regulation and control by microprocessor, electrical supply for any type of appliance, full internal protection, battery lifetime optimization (B.L.O.) function, and Plug&Play setup.
Technical Specifications
The following tables detail the specifications for the Studer AJ series inverters across different models and voltage configurations.
| Specification | aj 275-400 | aj 500-700 | aj 1000-1300 | aj 2100-2400 |
|---|---|---|---|---|
| Nominal battery voltage | 12/24/48 Vdc | 12/24 Vdc | 12/24 Vdc | 12/24 Vdc |
| Continuous power @ 25°C | 200-300 VA | 400-500 VA | 800-1000 VA | 2000 VA |
| Power 30 min. @ 25°C | 275-400 VA | 500-700 VA | 1000-1300 VA | 2100-2400 VA |
| Power 5 sec. @ 25°C | 450-1000 VA | 1000-1400 VA | 2200-2800 VA | 5000-5200 VA |
| Output voltage and frequency | Sine wave 230 Vac (120 Vac*) ±5% / 50 Hz (60 Hz*) ± 0.05% (crystal controlled) | |||
| Weight | 2.4-2.6 kg | 4.5 kg | 8.5 kg | 18-19 kg |
| Dimensions (h/w/l) | 142/163/84 mm | 142/240/84 mm | 142/428/84 mm | 273/399/117 mm |
| Ingress Protection (DIN 40050) | IP 30 | IP 30 | IP 30 | IP 20 |
| Remote control | rcm01/02/03 | jt8 | jt8 | jt8 |
aj 275-400 Series
| Specification | aj 275-12 | aj 350-24 | aj 400-48 |
|---|---|---|---|
| Nominal battery voltage (Input range) | 12 Vdc (10.5 - 16 Vdc) | 24 Vdc (21-32 Vdc) | 48 Vdc (42-60 Vdc) |
| Continuous power @ 25°C | 200 VA | 300 VA | 300 VA |
| Power 30 min. @ 25°C | 275 VA | 350 VA | 400 VA |
| Power 5 min. @ 25°C | 350 VA | 500 VA | 600 VA |
| Power 5 sec. @ 25°C | 450 VA | 650 VA | 1000 VA |
| Asymmetric load max. | 150 VA | 150 VA | 200 VA |
| Max. efficiency (%) | 93% | 94% | 94% |
| Cos φ max. | 0.1-1 up to 200 VA | 0.1-1 up to 300 VA | 0.1-1 up to 300 VA |
| Detection of the load (Stand-by) | 2 W only with the solar option -S | ||
| Short-circuit current AC 2 sec. | 2.3 Aac (4.6 Aac*) | 3.2 Aac (6.4 Aac*) | 4.6 Aac (9.2 Aac*) |
| Output voltage | Sine wave 230 Vac (120 Vac*) ±5% | ||
| Frequency | 50 Hz (60 Hz*) ± 0.05% (crystal controlled) | ||
| Consumption Stand-by / ON no load | 0.3 W**/2.4 W | 0.5 W**/3.5 W | 1.1 W**/5.2 W |
| Reverse polarity protection as internal fuse | 60 A | 40 A | 25 A |
| Protection Features | Distortion THD (resistive load) < 3% (@Pnom & Uin nom.) | Overheat protection (±5°C) Shut down @ 75°C - Auto-restart @ 70°C | Overload and short circuit protection Automatic disconnection with 2 time restart attempt | Deep discharge battery protection Shut off @ 0.87 x Unom - Automatic restart @ Unom | Max. battery voltage Shut off @ >1.33 x Unom - Automatic restart @ < Umax | Acoustic alarm Before low battery or overheating disconnection | ||
| General data | Weight: 2.4 kg Dimensions h/w/l: 142/163/84 mm | Weight: 2.6 kg Dimensions h/w/l: 142/240/84 mm | Weight: 2.6 kg Dimensions h/w/l: 142/428/84 mm |
| Conformity | Low voltage directive (LVD) 2014/35/EU: EN/IEC 62109-1, 62109-2, 62477-1, electromagnetic compliance (EMC) directive 2014/30/EU: EN/IEC 61000-3-3, 61000-6-2, 61000-6-4, 62040-2 | ||
| Ingress protection of enclosures | IP30 | IP30 | IP30 |
| Operating temperature range | -20 to 50°C | ||
| Relative humidity | 95% (non condensing) | ||
| Ventilation forced | from 45°C ± 5°C | ||
| Length cables (battery/AC out) | 1.2 m/1m | 1.2 m/1m | 1.2 m/1m |
| Acoustic level | < 45 dB (with ventilation) | ||
| Approximate correction of Pnom | -1.5% / °C from + 25°C | ||
| Recommended battery capacity | > 5 x Pnom/Unom (recommended value in Ah) | ||
aj 500-700 Series
| Specification | aj 500-12 | aj 600-24 | aj 700-48 |
|---|---|---|---|
| Nominal battery voltage (Input range) | 12 Vdc (10.5 - 16 Vdc) | 24 Vdc (21-32 Vdc) | 48 Vdc (42-60 Vdc) |
| Continuous power @ 25°C | 400 VA | 500 VA | 500 VA |
| Power 30 min. @ 25°C | 500 VA | 600 VA | 700 VA |
| Power 5 min. @ 25°C | 575 VA | 675 VA | 900 VA |
| Power 5 sec. @ 25°C | 1000 VA | 1200 VA | 1400 VA |
| Asymmetric load max. | 250 VA | 300 VA | 300 VA |
| Max. efficiency (%) | 93% | 94% | 94% |
| Cos φ max. | 0.1-1 up to 400 VA | 0.1-1 up to 500 VA | 0.1-1 up to 500 VA |
| Detection of the load (Stand-by) | Adjustable: 1 to 20 W | ||
| Short-circuit current AC 2 sec. | 5.2 Aac (10.4 Aac*) | 5.7 Aac (11.4 Aac*) | 7 Aac (14 Aac*) |
| Output voltage | Sine wave 230 Vac (120 Vac*) ±5% | ||
| Frequency | 50 Hz (60 Hz*) ± 0.05% (crystal controlled) | ||
| Consumption Stand-by / ON no load | 0.4 W/ 4.6 W | 0.6 W/ 7.2 W | 1.5 W/ 12 W |
| Reverse polarity protection as internal fuse | 120 A | 90 A | 60 A |
| Protection Features | Distortion THD (resistive load) < 3% (@Pnom & Uin nom.) | Overheat protection (±5°C) Shut down @ 75°C - Auto-restart @ 70°C | Overload and short circuit protection Automatic disconnection with 2 time restart attempt | Deep discharge battery protection Shut off @ 0.87 x Unom - Automatic restart @ Unom | Max. battery voltage Shut off @ >1.33 x Unom - Automatic restart @ < Umax | Acoustic alarm Before low battery or overheating disconnection | ||
| General data | Weight: 4.5 kg Dimensions h/w/l: 142/240/84 mm | Weight: 4.5 kg Dimensions h/w/l: 142/240/84 mm | Weight: 4.5 kg Dimensions h/w/l: 142/240/84 mm |
| Conformity | Low voltage directive (LVD) 2014/35/EU: EN/IEC 62109-1, 62109-2, 62477-1, electromagnetic compliance (EMC) directive 2014/30/EU: EN/IEC 61000-3-3, 61000-6-2, 61000-6-4, 62040-2 | ||
| Ingress protection of enclosures | IP30 | IP30 | IP30 |
| Operating temperature range | -20 to 50°C | ||
| Relative humidity | 95% (non condensing) | ||
| Ventilation forced | from 45°C ± 5°C | ||
| Length cables (battery/AC out) | 1.5 m / 1 m | 1.5 m / 1 m | 1.5 m / 1 m |
| Acoustic level | < 45 dB (with ventilation) | ||
| Approximate correction of Pnom | -1.5% / °C from + 25°C | ||
| Recommended battery capacity | > 5 x Pnom/Unom (recommended value in Ah) | ||
aj 1000-1300 Series
| Specification | aj 1000-12 | aj 1300-24 |
|---|---|---|
| Nominal battery voltage (Input range) | 12 Vdc (10.5 - 16 Vdc) | 24 Vdc (21-32 Vdc) |
| Continuous power @ 25°C | 800 VA | 1000 VA |
| Power 30 min. @ 25°C | 1000 VA | 1300 VA |
| Power 5 min. @ 25°C | 1200 VA | 2000 VA |
| Power 5 sec. @ 25°C | 2200 VA | 2800 VA |
| Asymmetric load max. | 500 VA | 600 VA |
| Max. efficiency (%) | 93% | 94% |
| Cos φ max. | 0.1-1 up to 800 VA | 0.1-1 up to 1000 VA |
| Detection of the load (Stand-by) | Adjustable: 1 to 20 W | |
| Short-circuit current AC 2 sec. | 10 Aac (20 Aac*) | 13 Aac (26 Aac*) |
| Output voltage | Sine wave 230 Vac (120 Vac*) ±5% | |
| Frequency | 50 Hz (60 Hz*) ± 0.05% (crystal controlled) | |
| Consumption Stand-by / ON no load | 0.7 W/ 10 W | 1.2 W/13 W |
| Reverse polarity protection as internal fuse | 125 A | 100 A |
| Protection Features | Distortion THD (resistive load) < 3% (@Pnom & Uin nom.) | Overheat protection (±5°C) Shut down @ 75°C - Auto-restart @ 70°C | Overload and short circuit protection Automatic disconnection with 2 time restart attempt | Deep discharge battery protection Shut off @ 0.87 x Unom - Automatic restart @ Unom | Max. battery voltage Shut off @ >1.33 x Unom - Automatic restart @ < Umax | Acoustic alarm Before low battery or overheating disconnection | |
| General data | Weight: 8.5 kg Dimensions h/w/l: 142/428/84 mm | Weight: 8.5 kg Dimensions h/w/l: 142/428/84 mm |
| Conformity | Low voltage directive (LVD) 2014/35/EU: EN/IEC 62109-1, 62109-2, 62477-1, electromagnetic compliance (EMC) directive 2014/30/EU: EN/IEC 61000-3-3, 61000-6-2, 61000-6-4, 62040-2 | |
| Ingress protection of enclosures | IP30 | IP30 |
| Operating temperature range | -20 to 50°C | |
| Relative humidity | 95% (non condensing) | |
| Ventilation forced | from 45°C ± 5°C | |
| Length cables (battery/AC out) | 1.5 m / 1 m | 1.5 m / 1 m |
| Acoustic level | < 45 dB (with ventilation) | |
| Approximate correction of Pnom | -1.5% / °C from + 25°C | |
| Recommended battery capacity | > 5 x Pnom/Unom (recommended value in Ah) | |
aj 2100-2400 Series
| Specification | aj 2100-12 | aj 2400-24 |
|---|---|---|
| Nominal battery voltage (Input range) | 12 Vdc (10.5 - 16 Vdc) | 24 Vdc (21-32 Vdc) |
| Continuous power @ 25°C | 2000 VA | 2000 VA |
| Power 30 min. @ 25°C | 2100 VA | 2400 VA |
| Power 5 min. @ 25°C | 2450 VA | 2800 VA |
| Power 5 sec. @ 25°C | 5000 VA | 5200 VA |
| Asymmetric load max. | 1000 VA | 1200 VA |
| Max. efficiency (%) | 92% | 94% |
| Cos φ max. | 0.1-1 up to 2000 VA | 0.1-1 up to 2000 VA |
| Detection of the load (Stand-by) | Adjustable: 1 to 20 W | |
| Short-circuit current AC 2 sec. | 26 Aac (52 Aac*) | 30 Aac (60 Aac*) |
| Output voltage | Sine wave 230 Vac (120 Vac*) ±5% | |
| Frequency | 50 Hz (60 Hz*) ± 0.05% (crystal controlled) | |
| Consumption Stand-by / ON no load | 0.7 W/ 16 W | 1.2 W/ 16 W |
| Reverse polarity protection as internal fuse | Not protected | 150 A |
| Protection Features | Distortion THD (resistive load) < 3% (@Pnom & Uin nom.) | Overheat protection (±5°C) Shut down @ 75°C - Auto-restart @ 70°C | Overload and short circuit protection Automatic disconnection with 2 time restart attempt | Deep discharge battery protection Shut off @ 0.87 x Unom - Automatic restart @ Unom | Max. battery voltage Shut off @ >1.33 x Unom - Automatic restart @ < Umax | Acoustic alarm Before low battery or overheating disconnection | |
| General data | Weight: 19 kg Dimensions h/w/l: 273/399/117 mm | Weight: 18 kg Dimensions h/w/l: 273/399/117 mm |
| Conformity | Low voltage directive (LVD) 2014/35/EU: EN/IEC 62109-1, 62109-2, 62477-1, electromagnetic compliance (EMC) directive 2014/30/EU: EN/IEC 61000-3-3, 61000-6-2, 61000-6-4, 62040-2 | |
| Ingress protection of enclosures | IP20 | IP20 |
| Operating temperature range | -20 to 50°C | |
| Relative humidity | 95% (non condensing) | |
| Ventilation forced | from 45°C ± 5°C | |
| Length cables (battery/AC out) | 1.7 m/1m | 1.7 m/1m |
| Acoustic level | < 45 dB (with ventilation) | |
| Approximate correction of Pnom | -1.5% / °C from + 25°C | |
| Recommended battery capacity | > 5 x Pnom/Unom (recommended value in Ah) | |
Options
The AJ series offers various options for enhanced functionality:
- Solar regulator: Available with different voltage and current max settings. Principle: Floating 3 stages (I/U/UO).
- Remote control: Available models include rcm01/02/03 and jt8.
Specific options and their configurations:
| Feature | aj 275-400 | aj 500-700 | aj 1000-1300 | aj 2100-2400 |
|---|---|---|---|---|
| Solar regulator Voltage max. | 25 Vdc | 45 Vdc | 25 Vdc | 45 Vdc |
| Solar regulator Current max. | 10 Adc | 15 Adc | 25 Adc | 30 Adc |
| Solar regulator Principle | Floating 3 stages (I/U/UO) | |||
| Solar regulator Absorption voltage | 14.4 Vdc | 28.8 Vdc | 14.4 Vdc | 28.8 Vdc |
| Solar regulator Floating voltage | 13.6 Vdc | 27.2 Vdc | 13.6 Vdc | 27.2 Vdc |
| Remote control | rcm01/02/03 ✔️ | ✔️ | ✔️ | ✔️ |
Note: The checkmark ✔️ indicates availability for the respective model series.
Certifications
The manufacturing facilities are certified according to ISO 9001:2015 and ISO 14001:2015 standards.
Image: Logos for ISO 9001, ISO 14001, Net (Netzbetreiber), and other certification marks.
