800 V AC LT panels for string-inverter solar architecture
Accu-panels has introduced a selection of LT Panels (ACDB) with 800V AC ratings to support the higher voltage architectures in solar power plants. 800V AC ACDB solutions will help new solar power plants introducing string inverter architectures to lower overall system costs. Operating with higher voltages reduces the transmission losses & cabling costs of solar plants, while limiting the impact of any faults, reducing downtime and maximizing productivity. Higher voltage ratings will also mean fewer DC combiner boxes and less wiring complexity.
Solar ACDB (Ac distribution board) is a crucial a part of the SPV system for solar energy Plant. Accu-panels is CPRI approved #acdb #dcdb manufacturer in India.
It combines the output 3 phase as well as single-phase AC power of inverter placed in the solar plant system into a single box called ACDB (AC Distribution Board).We are making customized boards consistent with client’s specifications, like indoor type (IP52), outdoor type floor standing, wall mounting, stand mounting consistent with the client requirement. Also, we offer IP67 Certificate for Polycarbonate box and IP65 certificate for MS box
Why we started manufacturing 800 V LT panels
Accu-Panels has been manufacturing All type of LT panels and Solar ACDB DCDB since 2009. we have manufactured and supplied a lot of electrical panels. Solar is our favorite sector in Industries. One day we received an inquiry from EPC contractor with a requirement of 800 volts. We have Offer normally with 415V but after Order So many challenges we have faced at the time of Designing. We have developed a very well-designed team. Our team made a good design after many discussions with client, Consultant & Developer. Finally, A design ready and switchgear manufacturer have also approved it. Even though the manufacturing time of 800V Switchgear was long, we requested a lot and delivered it as soon as possible. In addition, the design was IP65 (Outdoor Application). So that we had enough Ventilation space in the panel. Although we are CPRI Approved and we undertook panel manufacturing by follow IEC 61439 as per requirements of Standards. Thus, giving warning to EPC contractor while charging for check temperature daily for avoid heating issue. Even though we have found some heating issue in CT and PT. After which we got to know a lot and, in our quality, we brought a lot of improvement and finally we made a design that is MW scale LT panel by brand “ACCU-PANELS”.
| Feature | Specification |
| Voltage Rating | 800V AC, 50Hz, 3-wire system |
| Application Use | AC power collection, fault isolation, energy metering |
| Enclosure Material | CRCA steel (2mm frame, 1.6mm partitions, 3mm supports) |
| Ingress Protection | IP52 (indoor), IP55/IP65 (outdoor) |
| Height Compliance | ≤2400mm total height; top switch ≤1750mm from floor |
| Gland Plate | 5mm aluminium/stainless steel, modular and gasketed |
| Base Frame | 75/100mm structural steel channels |
| Finish & Paint | RAL7035 shade, C5-grade coating with 9-tank anti-corrosion process |
What Are 800V LT Panels?
At their core, 800V LT panels are low-voltage switchgear assemblies rated for 800V AC. These powerful yet compact units play a crucial role in modern solar farms by:
Aggregating output from multiple string inverters
Safely routing power to step-up transformers
Managing faults and enabling remote SCADA monitoring
Their elevated voltage handling capacity makes them uniquely suited for today’s high-performance inverter systems, transforming traditional energy distribution into smart, scalable infrastructure.
Why 800 V LT panels matter in MW-Scale Solar Projects
As developers and EPCs (Engineering, Procurement & Construction companies) aim for reliability and long-term ROI, these panels emerge as a key enabler. The shift toward 1500V DC string inverter systems introduces new voltage demands on AC infrastructure—and 800V LT panels meet the challenge with:
Superior electrical compatibility
Robust fault isolation and energy metering capabilities
Built-in compliance with international standards (CPRI & IEC 61439)
This ensures safe, continuous operation while supporting large-scale deployments across diverse geographic conditions.
800 V LT panel technical specifications
| Parameter | Accu-Panels range |
|---|---|
| Design standard | IEC 61439-1/2; CPRI type-tested design (short-circuit, temperature rise, dielectric, IP) |
| Rated operational voltage | 800 V AC, 3-phase 3-wire, 50 Hz (690 V and 415 V variants) |
| Rated insulation voltage (Ui) | 1000 V |
| Rated current | 630 A to 6300 A main busbar; inverter feeders 100 A to 400 A |
| Short-time withstand (Icw) | 50 kA or 65 kA for 1 s |
| Switchgear | 800 V-rated MCCBs per inverter feeder, ACB incomer / outgoing to inverter transformer, Type 2 AC SPD, earth-fault protection |
| Metering & SCADA | Multifunction meter, class 0.5 CTs, Modbus RTU / TCP, auxiliary contacts and trip indication to plant SCADA |
| Degree of protection | IP54 indoor / IP55–IP65 outdoor with canopy, per IEC 60529 |
| Enclosure & finish | 2.0 mm CRCA frame, 1.6 mm doors; 7-tank pre-treatment; C5 anti-corrosion coating system (ISO 12944) for open-field and coastal sites; height ≤ 2400 mm for container / skid mounting |
| Busbars | Electrolytic copper or aluminium, sleeved, on SMC/DMC supports, sized by temperature-rise verification at 50 °C ambient |
Why 800 V AC lowers plant cost
Raising the inverter output from 415 V to 800 V AC cuts the current for the same power by almost half. That halves conductor cross-section and I²R losses between inverters and the transformer, allows more inverters per LT panel and fewer transformers per MW, and simplifies the layout of large string-inverter blocks. The trade-off is that every component — breakers, busbars, SPDs, meters — must be rated and type-tested for 800 V, which is exactly what the Accu-Panels 800 V platform provides.
Case study: 4.2 MWp solar plant
For a 4.2 MWp ground-mount plant using 800 V string inverters, Accu-Panels supplied IP65, C5-coated 800 V LT panels with MCCB inverter feeders, ACB outgoings to the inverter transformers, SPDs and SCADA-ready metering. Read the full 4.2 MWp 800 V LT panel case study, or dive into the engineering in our 800 V LT ACDB technical highlights, busbar and enclosure design and switchgear and protection logic guides.
Frequently asked questions
Is 800 V AC still considered LT (low voltage)?
Yes. IEC and Indian practice define low voltage as up to 1000 V AC, so 800 V AC switchgear is LT equipment, but it needs components rated for 800 V rather than standard 415 V products.
Can standard 415 V MCCBs be used at 800 V?
No. Breakers, contactors and SPDs must carry an 800 V (or 1000 V) rated operational voltage with a specified breaking capacity at that voltage. Accu-Panels selects 800 V-rated switchgear and verifies the assembly by type testing.
Which IP rating and coating do you recommend for open-field plants?
IP65 with a canopy and a C5 anti-corrosion coating system, which is designed for 15 years or more in high-corrosivity environments including coastal and industrial sites.
How many inverters can one 800 V LT panel take?
Typically 8 to 24 string-inverter feeders per panel depending on inverter size and the transformer rating; we design the panel from your block layout.
Do you supply the ACDB and combiner boxes too?
Yes. AC combiner boxes, solar ACDB/DCDB, array junction boxes and NVR panels are supplied as a matched package.
Planning an 800 V plant? Send us your block SLD for panel sizing, GA drawings and a quotation.
