What an 800V LT Panel Is, and Why Big Solar Plants Use It

An 800V LT panel aggregates and distributes the AC output of high-voltage string inverters — the 1500 V DC generation that outputs 800 V AC — in MW-scale solar plants. Running the LT collection at 800 V instead of 415 V cuts the current roughly in half for the same power, which cuts conductor sizes, cable counts, combiner stages and I²R transmission losses across the whole balance of system. That is why modern utility-scale plants standardise on it.

Wisdom Techno Solutions builds 800V LT panels at our Vadodara works with 800 V class switchgear per IEC 60947, busbars sized with thermal margin for the combined inverter current, surge protection rated for the 800 V system, and energy metering with SCADA-ready monitoring provisions. Assembly follows IEC 61439-1 and -2 practice, in powder-coated CRCA enclosures for indoor or outdoor installation.

  • 800 V class MCCBs / ACBs per feeder — standard 415 V devices are not a substitute at this voltage
  • Roughly half the current of a 415 V scheme for the same power — smaller cables, fewer runs, lower losses
  • SPD rated for the 800 V system, coordinated with the plant lightning-protection design
  • Energy metering and remote SCADA monitoring provisions built in
  • Fault isolation per inverter group, so one fault does not shut the block
  • Indoor or outdoor execution, IP54 / IP65

800V LT Panel Technical Specifications

The table below is the standard build. Feeder count, device ratings and busbar size are set from the inverter schedule and the block single line diagram.

ParameterSpecification
Board type 800 V class LT panel — aggregates and distributes the AC output of high-voltage string inverters in MW-scale solar plants
Rated voltage 800 V AC class (against the conventional 415 V LT level)
Typical application MW-scale solar plants using 1500 V DC string inverters with 800 V AC output
Function Safe power collection, feeder protection, fault isolation, energy metering
Feeder protection MCCBs / ACBs rated for the 800 V class, per the inverter schedule
Surge protection AC surge protection device rated for the 800 V system
Monitoring Energy metering and provisions for remote SCADA monitoring
Busbar Copper or aluminium, sized for the combined current with thermal margin
Enclosure Powder-coated CRCA sheet steel; indoor or outdoor execution per site
Ingress protection IP54 indoor; IP65 outdoor
Component standards 800 V class switchgear per IEC 60947
Assembly practice IEC 61439-1 and IEC 61439-2 practice
Testing Routine tests and inspection at the works before dispatch, with test report
Facility Kotambi, Vadodara, Gujarat, India
Delivery 6 to 7 weeks from drawing approval, subject to switchgear availability

800 V vs 415 V LT Collection — What Changes

415 V LT scheme800 V LT scheme
Current for the same powerBaselineRoughly half
Cable cost and countHigher — more parallel runsLower — fewer, smaller runs
Transmission lossesHigher I²R lossesSubstantially lower
SwitchgearStandard 415 V LT devices800 V class devices — specified, not assumed
Where it winsSmall and rooftop plantsMW-scale plants with 1500 V DC string inverters

The saving is real but the discipline matters: every device in the panel must actually be rated for the 800 V class. A 415 V breaker in an 800 V board is not a cost saving — it is a failure waiting for its first fault.

What to Send for an 800V LT Panel Quotation

The inverter schedule (model, count, AC output current at 800 V), the block layout and how inverters group per panel, the outgoing arrangement to the transformer, metering and SCADA requirements, and the site conditions (indoor/outdoor, IP rating). A block single line diagram is the ideal input — send it through the Get a Quote form.

How Wisdom Techno Solutions Builds 800V LT Panels

The same LT switchboard discipline as our industrial boards, applied at the 800 V class: busbar sizing with thermal margin, clearances and creepage checked for the higher voltage, GA and SLD drawings approved before manufacturing, routine tests and inspection before dispatch with the test report shipped. Where the plant also needs the low-voltage side — ACDB, combiner boxes, DCDB and AJBs — one works supplies the matched package.

Related Technical Guides

Related Panel Types

If this is not the right fit for your layout, these are the related products we build to the same standard:

Send Your Single Line Diagram

Email your single line diagram, load list and system fault level and our engineers will come back with a technical offer. Not sure what to send? See what a panel manufacturer needs in order to quote accurately.

Manufacturer Wisdom Techno Solutions
Works Plot 9, Nilkanth Industrial Park 1, near Kotambi Stadium, Kamrol, Kotambi, Vadodara, Gujarat 391510, India
Email connect@wisdomtechnosolutions.com
Phone +91 80002 29727
Working hours Monday to Saturday, 8:00 am to 5:00 pm IST
Delivery lead time 6 to 7 weeks from drawing approval, subject to switchgear availability

Frequently Asked Questions About 800V LT Panels

What is an 800V LT panel?
An LT distribution panel built in the 800 V AC class, used to aggregate and distribute the output of high-voltage string inverters in MW-scale solar plants. Running collection at 800 V roughly halves the current for the same power compared to 415 V, cutting cable sizes, cable counts and transmission losses.
Why do 1500 V DC solar plants use 800 V AC panels?
Because 1500 V DC string inverters output around 800 V AC. Collecting at that voltage instead of stepping down keeps currents low across the balance of system, which is where the cable and loss savings come from. The inverter-duty transformer then steps 800 V up to the grid voltage.
Can standard 415 V switchgear be used in an 800 V panel?
No. Every device — breakers, contactors, SPDs, metering — must be rated for the 800 V class. Insulation, clearances and creepage distances are checked for the higher voltage as part of the panel design.
Does the panel support SCADA monitoring?
Yes — energy metering and provisions for remote SCADA monitoring are built in where the project requires them, so block-level generation data feeds the plant monitoring system.
Is an 800V LT panel the same as an ACDB?
It does the ACDB's job — collection, protection, metering, isolation — but at the 800 V class with correspondingly rated devices. For 415 V plants, see the AC Distribution Board page.
Which standards apply?
Switchgear per IEC 60947 in the 800 V class; the assembly follows IEC 61439-1 and IEC 61439-2 practice, with routine tests and inspection at the works before dispatch and the test report shipped with the panel.
What should I send to get a quotation?
The inverter schedule with AC output current at 800 V, the block layout and inverter grouping, the outgoing arrangement to the transformer, metering and SCADA requirements, and the site conditions. A block single line diagram is the ideal input.

Page updated: 17 September 2026