Smart inverter

ID: concept:smart-inverter
IRI: https://solarlattice.org/kb/concept/smart-inverter
Status: active
Also known as: advanced inverter functions, grid support utility interactive, smart inverter functions, grid support utility interactive inverter, grid support interactive inverter, Utility Support Grid Interactive Inverter, advanced inverter function
Category: Grid
Concept kind: technology

A smart inverter is an inverter with functions that, once activated, can support the grid on their own when voltage or frequency moves outside normal conditions. Besides converting DC to grid-compliant AC and disconnecting when grid limits are exceeded, it can modulate its output, for example by changing its power factor, to help keep the grid stable. Typical smart inverter functions include power factor adjustment, low- and high-voltage ride-through, volt-watt control, dynamic reactive current support and volt-var control. In product documentation these devices are called grid support utility interactive inverters, and they are tested to UL 1741 SA or, more recently, UL 1741 SB with IEEE 1547-2018. Inverters certified this way need no extra grid monitoring equipment to connect to the utility grid. Some manuals give a default state for each function per grid profile, with ride-through and soft-start reconnection enabled under IEEE 1547-2018, Rule 21 and ISO-NE.

Claims

`related_to`

c1 drafted · lead Inverter

A smart inverter is an inverter that, beyond DC-to-AC conversion, modulates its output to support the grid.

Rule 21 [code/standard] sec=h85 h=595988bd997f
SHP Peak3 125-150 GridServices-TechInfo sec=1.2 h=41f924383b1b

c2 verified · fact UL 1741 SA proposed

Scope: products Sunny Boy 3.0-7.7-US-41 proposed, Sunny Boy 3.0-7.7-US-40 proposed, Sunny Tripower TL-US, Sunny Tripower CORE1-US, Sunny Highpower PEAK3, Delta M36U/M42U three-phase string inverter proposed

Grid support utility interactive inverters are tested and certified to UL 1741 SA.

SBxx-US-1XP-41-BA-en-12 sec=h67 h=208f7a4ad586
STPTL-US-10-IA-xx-22 sec=h62 h=35c537013497
STP Core 1 User Manual v1.1 50-62 sec=h57 h=ba1fbb7d1b5d
SBxx-US-1XP-40-BA-en-13 sec=h66 h=35c537013497
SHP Peak3 125-150 GridServices-TechInfo sec=1.2 h=41f924383b1b
20191015-M42 36U manual tbl=34.r1 h=ea5ce33291a4

verified by: review-workflowverified on: 2026-10-24

c3 drafted · lead UL 1741 SB proposed

Newer grid support inverters are tested to UL 1741 SB together with IEEE 1547-2018.

stpsxxus-20-grid-management-services sec=h1 h=744efc955684

review note: support check: partial - u16 states testing to UL 1741 SB / IEEE 1547-2018 for a grid support inverter, but doesn't call it a smart inverter or say 'newer' inverters.

c4 drafted · lead IEEE 1547-2018 proposed

Smart inverter functions are enabled by default under the IEEE 1547-2018 setting profile in some inverters.