---
title: "Solar / Storage Skid — Inverter-Duty Step-Up Substation | Entogo"
description: "An inverter-duty step-up unit substation (solar/storage skid) integrating a liquid-filled step-up transformer, MV switching and inverter interface —…"
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---

Home › Products › Transformers & Substations › Solar / Storage Skid — Inverter-Duty Step-Up Unit Substation

Transformers & Substations

# Solar / Storage Skid — Inverter-Duty Step-Up Unit Substation

inverter-duty · up to 34.5 kV

![Entogo inverter-duty solar and storage step-up unit substation skid](https://entogo.ca/_astro/Entogo-New-Energy-Integrated-PV-Prefabricated-Box-Substation.BbhcGbvm_Z1ULC7s.webp)

Overview

An inverter-duty step-up unit substation (solar/storage skid) integrating a liquid-filled step-up transformer, MV switching and inverter interface — stepping inverter low voltage up to 34.5 kV for PV and battery-storage interconnection, 60 Hz. Designed to IEEE C57.12.34, C57.159 and C37.121; UL/CSA certifiable.

Entogo designs and builds the Solar / Storage Skid — Inverter-Duty Step-Up Unit Substation in its own factory with a vertically integrated supply chain: this product ships in 16–24 weeks (new UL or CSA certification can extend that, within a guaranteed 36-week worst case), and every Entogo product carries a minimum 36-month manufacturer warranty.

This **inverter-duty step-up unit substation** — a solar/storage skid — integrates a liquid-filled step-up transformer, medium-voltage switching and the inverter interface into one outdoor enclosure for utility-scale PV and battery-storage interconnection. It steps the inverter low-voltage side (typically 600 / 690 / **800 V class**) up to **34.5 kV** (15 / 25 / 35 kV class) at 60 Hz for medium-voltage collection and grid connection.

The transformer is engineered for inverter duty — harmonic loading, frequent cycling and dual-winding options — referenced to **IEEE C57.159**, with mineral-oil (or FR3 natural-ester) insulation and ONAN cooling. A remote-monitoring cabinet with UPS oversees operation, and the **NEMA 3R** outdoor enclosure suits exposed renewable sites. Designed and built to **IEEE C57.12.34**, C57.159 and C37.121, with UL (cULus) / CSA certification available on request.

## Key features

- Inverter-duty step-up unit substation designed for the harmonic content, frequent loading and dual-winding needs of PV / BESS inverters.
- Steps inverter low voltage (600 / 690 / 800 V class) up to 34.5 kV for medium-voltage collection and grid interconnection, 60 Hz.
- Designed and built to IEEE C57.12.34, C57.159 (transformers for inverter-based resources) and C37.121 — UL (cULus) / CSA certification available on request.
- Integrated MV switching, inverter interface and remote-monitoring cabinet with UPS in one outdoor skid.
- Mineral oil standard, FR3 natural ester optional; ONAN natural-air cooling; NEMA 3R enclosure for utility-scale sites.

Custom-engineered · built to order

[Get a quote](https://entogo.ca/contact/)

Lead time

16–24 weeks

Order now for estimated delivery Jan 2027 – Mar 2027.

Certification / testing may extend this per the standard and scope.

Quality & certifications

- ![UL safety certification mark](https://entogo.ca/_astro/Entogo-UL-Underwriters-Laboratories-North-America-Safety-Certification.BoQ45DeX_248O3C.webp)
- ![CSA certification mark](https://entogo.ca/_astro/Entogo-CSA-Canadian-Standards-Association-Safety-Certification.CY1FySDR_Z11vFCD.webp)
- ![CE European Conformity marking](https://entogo.ca/_astro/Entogo-CE-European-Conformity-Marking.xJPMJKcl_1wU1NT.webp)
- ![ISO 9001 quality management mark](https://entogo.ca/_astro/Entogo-ISO-9001-Quality-Management-System-Certification.DbscJvvM_47kvy.webp)
- ![ISO 14001 environmental management mark](https://entogo.ca/_astro/Entogo-ISO-14001-Environmental-Management-System-Certification.DXOTPjd4_Z4rpDm.webp)
- ![IEC CB Scheme mark](https://entogo.ca/_astro/Entogo-CB-Scheme-IEC-International-Electrical-Certification.CPXJ4xZK_aV0YT.webp)

Built under audited ISO quality systems and to ANSI/IEEE & IEC standards. Product-level UL (cULus) / CSA certification available on request.

[See all certifications](https://entogo.ca/certifications/)

## Specifications

Solar / Storage Skid — Inverter-Duty Step-Up Unit Substation specifications
| Specification | Value |
| --- | --- |
| Applicable standards | IEEE C57.12.34 · IEEE C57.159 (inverter-applied) · IEEE C37.121 · IEC 62271-202 |
| Type | Inverter-duty step-up unit substation (skid / pad-mounted) |
| Transformer | Three-phase, liquid-filled (mineral oil / FR3), ONAN |
| Low-voltage (inverter) side | 600 / 690 / 800 V class (per inverter) |
| Medium-voltage side | Up to 34.5 kV (15 / 25 / 35 kV class) |
| Frequency | 60 Hz |
| Design | Inverter-duty — harmonic loading, frequent cycling, dual-winding options |
| Sections | Step-up transformer + MV switching + inverter interface, integrated skid |
| Enclosure | NEMA 3R outdoor, galvanized + powder coat; remote monitoring + UPS |

Glossary: [Step-up](https://entogo.ca/glossary/#step-up-collector-transformer) [Unit substation](https://entogo.ca/glossary/#unit-substation) [Liquid-filled](https://entogo.ca/glossary/#liquid-filled-transformer) [60 Hz vs. 50 Hz](https://entogo.ca/glossary/#60-hz-vs-50-hz)

## Applications

- Utility-scale solar PV collector substations
- Battery energy-storage (BESS) interconnection
- Solar-plus-storage step-up and grid connection
- Distributed-generation and microgrid interconnection

Payment & financing

Flexible payment and project financing is available for qualified projects — milestone-based plans, reduced upfront terms and third-party financing. Entogo is the equipment supplier, not a lender; all options are subject to credit review and a signed agreement.

[See payment options](https://entogo.ca/payment-options/)

After-sales

Backed by Entogo lifecycle service — technical support, spare parts and a minimum 36-month warranty (well beyond the industry norm; up to 10 years on major power equipment, confirmed per contract). Our team responds to every request within one business day.

[After-sales support](https://entogo.ca/support/) [Track an order](https://entogo.ca/support/order-status/)

FAQ

## Common questions

- **What does "inverter-duty" mean for this substation transformer?**: Inverter-duty units are designed for the harmonic content, frequent loading cycles and (often) dual low-voltage windings of PV and battery-storage inverters — referenced to IEEE C57.159 — rather than conventional utility loading, which protects insulation life on renewable sites.
- **What voltages does it step between?**: It steps the inverter low-voltage side (typically 600 / 690 / 800 V class) up to 34.5 kV (15 / 25 / 35 kV class) for medium-voltage collection and grid interconnection, at 60 Hz.
- **Which standards and certifications apply?**: Designed to IEEE C57.12.34, C57.159 (inverter-applied transformers), C37.121 and IEC 62271-202. UL (cULus) / CSA certification is available on request.

Power Equipment

## Related products

[![Entogo three-phase pad-mounted distribution transformer, dead-front, NEMA 3R enclosure](https://entogo.ca/_astro/Entogo-10kV-Three-Phase-Oil-Immersed-Distribution-Transformer.MmNE1ATv_Z1W8tN.webp) Power Equipment ### Three-Phase Pad-Mounted Distribution Transformer Three-phase pad-mounted distribution transformer for North-American utility, commercial and industrial service — 75–2500 kVA, 12.47–34.5 kV class primary to 480Y/277 or 208Y/120 secondary, dead-front loop/radial-feed, NEMA 3R. Designed to IEEE C57.12.34 and DOE 10 CFR 431; UL/CSA certifiable. View](https://entogo.ca/products/three-phase-pad-mounted-transformer/)[![Entogo 36 kV outdoor compact unit substation for renewables and industrial sites](https://entogo.ca/_astro/Entogo-35kV-Chinese-Type-Substation.Dvb2rMnE_Z1wVTEq.webp) Power Equipment ### 36 kV Outdoor Compact Unit Substation A factory-assembled outdoor unit substation — incoming 34.5 / 35 kV switchgear, liquid-filled step-up or step-down transformer (1,000 – 10,000 kVA) and a low-voltage section in one weather-tight enclosure — for solar PV, wind, and industrial interconnection. Built to IEEE C37.121, ANSI C57.12.34 and IEC 62271-202. View](https://entogo.ca/products/outdoor-unit-substation-36kv/)[![Entogo amorphous-core high-efficiency dry-type transformer](https://entogo.ca/_astro/Entogo-SCBH15-Amorphous-Alloy-Dry-Type-Transformer.CfCVUmci_Z56Pvf.webp) Power Equipment ### Amorphous-Core Dry-Type Transformer (High-Efficiency) A high-efficiency amorphous-metal-core dry-type transformer with very low no-load loss, low noise and low partial discharge — 30–2500 kVA, medium voltage to 35 kV class stepping to 480/208 V, fire-safe. Designed to UL 1562, CSA C9/C802.2 and DOE 10 CFR 431; UL/CSA certifiable. View](https://entogo.ca/products/amorphous-core-dry-type-transformer/)

Request a quote

## Talk to engineering about the Solar / Storage Skid — Inverter-Duty Step-Up Unit Substation.

[Start an inquiry](https://entogo.ca/contact/)

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