2023 Inverter Technology Evolution: String, Hybrid, and Microinverter Advances

⏱️ Reading time: 5 minutes | Updated July 2026

Inverter technology saw some of its most significant shifts in years during 2023, driven by California's net metering overhaul, tightening grid interconnection standards, and rising demand for whole-home backup. String, hybrid, and microinverter categories all advanced, but hybrid architectures capable of managing solar, storage, and backup loads in a single device saw the sharpest growth in installer demand. This overview covers the technology and standards changes installers needed to track in 2023. PES Supply stocks 50,000+ SKUs from 169 authorized brands with delivery in 7–10 business days.

Hybrid Inverters Move to the Mainstream

Hybrid inverters — units that manage PV input, battery charge/discharge, and backup loads together — moved from a niche off-grid product category to a mainstream residential solution in 2023. The driver was straightforward: California's shift to the Net Billing Tariff (NEM 3.0) in April 2023 made pairing solar with storage far more valuable than exporting to the grid, and hybrid inverters simplify that pairing into a single piece of equipment rather than separate solar and battery inverters. Residential storage attachment rates under the new tariff rose to roughly 60%, according to a Lawrence Berkeley National Laboratory technical brief, and hybrid inverter demand followed closely.

Sol-Ark's Rising Popularity

Sol-Ark hybrid inverters saw significant growth in installer adoption through 2023, particularly among contractors serving off-grid, backup-focused, and storage-heavy residential projects. Their all-in-one design — combining a solar charge controller, battery inverter, and transfer switch functionality — appealed to installers navigating NEM 3.0's economics and to off-grid and rural customers seeking generator-integrated backup systems. Distributors report growing stocking demand for Sol-Ark alongside comparable hybrid platforms like EG4, Growatt, and GoodWe, all of which are available through PES Supply's hybrid inverter collection.

Enphase IQ8 Microinverter Expansion

Enphase continued expanding its IQ8 microinverter lineup throughout 2023, extending the platform's reach into new markets and higher-power module compatibility. In March 2023, Enphase began shipping new IQ8 microinverters — the IQ8MC, IQ8AC, and IQ8HC models — supporting modules up to 560W DC and managing continuous DC current of 14 amperes, according to an Enphase Energy investor press release. A key feature of the IQ8 line is its grid-independent operation: unlike earlier microinverter generations, IQ8 units can generate usable power during a grid outage without requiring a battery, directly from sunlight — a capability increasingly relevant as customers prioritized resilience following 2023's severe weather events. All IQ8 series units ship with a 25-year limited warranty.

UL 1741 SB and Smart Inverter Grid Support

Required Grid Support Functions

2023 also saw major movement on inverter certification standards tied to grid interactivity. California utilities began requiring UL 1741 Supplement SB (SB) certification and Common Smart Inverter Profile (CSIP) conformance for new interconnections. Pacific Gas & Electric, for example, mandated UL 1741 SB-certified inverters and CSIP compliance for all interconnection applicants starting August 29, 2023, per PG&E's official interconnection requirements document, issued under CPUC Resolutions E-5000 and E-5036.

UL 1741 SB requires inverters to support advanced grid functions defined in IEEE 1547-2018, including:

• Volt-VAR and volt-watt control for voltage regulation
• Frequency-watt response for grid frequency support
• Ramp-rate control to smooth output changes
• Remote monitoring and control capability via CSIP-compliant communication

The Interstate Renewable Energy Council (IREC) tracked availability of UL 1741 SB-certified products throughout 2023, noting that a growing number of states beyond California were moving toward similar smart inverter mandates for new distributed energy resource interconnections, making SB certification a near-universal requirement installers needed to verify before ordering equipment.

Rapid Shutdown Integration

Module-level rapid shutdown compliance, required under NEC 2017 and 2020 Section 690.12, remained a baseline requirement through 2023, with inverter and microinverter manufacturers continuing to integrate rapid shutdown transmitters directly into their hardware rather than requiring separate add-on devices. Microinverter and power-optimizer-based systems have an inherent advantage here, since each module-level device can natively satisfy rapid shutdown requirements without additional components — a factor that continued to support microinverter and DC optimizer adoption on residential rooftops alongside the growth of hybrid string systems for storage-focused installations.

String Inverters Remain Cost Leaders for Utility and Unshaded Arrays

Despite the hybrid and microinverter momentum, traditional string inverters retained their position as the lowest-cost-per-watt option for unshaded residential arrays and remained the dominant choice for commercial and utility-scale projects. String platforms from SMA, Fronius, Solis, and CPS continued to scale from 3.8kW residential units up to 275kW commercial-grade inverters, offering the best economics where storage and module-level optimization were not required.

Recommendations for Installers

• Verify UL 1741 SB / CSIP certification status before specifying inverters for California and other smart-inverter-mandate states.
• Stock hybrid inverters as a default option for storage-attached residential proposals, given the shift in market demand.
• Confirm rapid shutdown compliance method (module-level device vs. add-on transmitter) matches the latest NEC cycle adopted in the project's jurisdiction.

PES Supply carries string, hybrid, and microinverter platforms from all major manufacturers referenced above, with standard delivery of 7-10 business days on in-stock inverter orders.

Sources

• Enphase Energy — IQ8 Microinverter Launch Press Release
• PG&E — UL 1741 SB and CSIP Interconnection Requirements
• IREC — Smart Inverter Availability Research
• Lawrence Berkeley National Laboratory — NEM 3.0 Technical Brief
• NREL
• pv magazine USA

Shop This Article

Ready to specify equipment for your next project? PES Supply stocks 50,000+ SKUs from 169 authorized brands with delivery in 7–10 business days. Here are our top picks based on the topics discussed above:

• SMA Sunny Boy 5.0-US Inverter — 97% efficiency, residential grid-tied
• Sol-Ark 12K Hybrid Inverter — 12kW, battery-based, off-grid/hybrid
• Sol-Ark 15K Limitless NEMA3-R — 15kW hybrid, outdoor rated
• Fronius Primo 10.0-1 LITE — 10kW single-phase, residential/commercial
• GoodWe 5.0 kW PV Inverter (GW5000A-MS) — string inverter, grid-tied

Browse our complete selection: Inverters | Microinverters | Solar Panels

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