AI-W5.1 All-in-One BESS · 3.6–12 kW + up to 50 kWh

Highlights

• All-in-one system — a Deye hybrid inverter and stackable AI-W5.1-B LFP batteries in a single floor-standing stack. This page covers the system; full battery specs are on the AI-W5.1-B battery page.
• 6-in-one integrated design — hybrid inverter, battery PCS, battery pack, solar inverter, gateway and DC bus all built in. Stacks link PDU to PDU through the built-in parallel interface, with no external combiner box.
• Tool-free stacking — expand from 5 kWh to 50 kWh (Deye’s recommended maximum) by adding 5.12 kWh modules (up to five under the inverter, then battery-only stacks of up to six); one-click setup.
• 4 ms seamless switchover to backup for genuine energy security during outages.
• Single- or three-phase inverter (3.6–10 kW 1-ph / 5–12 kW 3-ph) from one product family.
• 10 kW single-phase now available — AI-W5.1-10P1-AU-B, the largest single-phase unit in the range.

Single-phase lineup (AU)

All single-phase models share one user manual and the same PDU, base and battery stacking. Figures below are from the datasheet table in Deye’s AU single-phase manual (V1.1.1, 9 July 2026).

	3.6P1	5P1	6P1	7P1	7.6P1	8P1	10P1
Rated AC in/out power (W)	3600	5000	6000	7000	7600	8000	9999
Max. apparent power (VA)	3600	5000	6000	7000	7600	8000	9999
Rated AC current (A)	15.7	21.8	26.1	30.5	33.1	34.8	43.5
Max. battery charge/discharge (A)	90	120	135	175	190	190	210
Max. PV access power (W)	7200	10000	12000	14000	15200	16000	20000
Max. PV input power (W)	5760	8000	9600	11200	12160	12800	16000

Full model codes take the form AI-W5.1-<rating>P1-AU-B. Common to every single-phase model: 40–60 V battery (1 input), 500 V max PV input, 125–500 V PV input range, 150–425 V MPPT, 230/240 V L+N+PE, 97.6% max efficiency, IP65, floor-mounted.

Every model in the table carries a 10-year warranty. Deye’s AU/NZ SUN Series warranty (V2.17, July 2026) lists all seven single-phase models, including the 7P1 and 10P1. Deye’s all-in-one inverter warranty (Ver1.0, for installations outside Europe) lists the 3.6, 5, 6, 7.6 and 8P1 and covers the LCD and cooling fan for the full ten years. The 7P1 and 10P1 are listed only in V2.17, whose second five years cover parts only, excluding the LCD, fan and labour.

AI-W5.1-10P1-AU-B — the 10 kW single-phase

• 9999 W / 9999 VA (the 10 kW class); rated and max AC current 43.5 A
• 20 kW max PV access (16 kW max PV input) — 2 MPP trackers, 2+2 strings, 32+32 A max operating PV current
• 210 A max battery charge/discharge — the highest in the single-phase range
• 50 A max continuous AC passthrough (grid→load); max output fault current 100 A; OCP 140 A
• Full-load MPPT range 250–425 V; 48+48 A max input short-circuit current
• Peak power 2× rated for 10 s; 97.6% max efficiency (96.5% Euro, >99% MPPT)
• Warranty: 10 years, as listed in Deye’s AU/NZ SUN Series warranty (V2.17, July 2026, p.3)

Typical configuration

• Main system (with inverter): 1 × hybrid inverter + 1 × PDU3 + 1–5 battery modules + 1 × Base (5.12–25.6 kWh). The inverter stack holds at most five modules.
• Battery-only stack (PDU1): 1 × PDU1 + 1–6 battery modules + 1 × Base (5.12–30.72 kWh) — a standalone stack that adds storage without another inverter
• Two stacks: PDU3 + PDU3, or PDU3 (master) + PDU1 (slave) — parallel modes 1 and 2 in Deye’s AU PDU1/PDU3 user manual (issue 03); its mode 3 adds an external inverter to the PDU1 stack

Neither PDU carries a screen or any settings control — both show a five-segment SOC arc plus RUN/ALARM/ERROR LEDs, and every setting is made on the inverter’s touchscreen LCD. See PDU1 vs PDU3.

The inverter comes in single-phase (3.6–10 kW) or three-phase (5–12 kW) variants — the PDU and battery stacking are the same either way.

Linking stacks — when a combiner box is needed

Each stack connects to the next PDU to PDU (OUT → IN) through the built-in parallel interface and DC bus, which Deye’s AU brochure labels “no external combiner box needed”. The brochure pictures the inverter stack with three battery-only (PDU1) stacks chained this way. Deye’s AU PDU1/PDU3 manual (issue 03) documents two-stack systems — PDU3 + PDU3, or PDU3 (master) + PDU1 (slave) — and neither needs a combiner box.

Every all-in-one inverter has a single battery input, and chained stacks share one DC bus back to it. Suncloud’s bank-counting combiner rule is for inverters with two battery inputs and does not carry over to this system. A DC combiner such as the Combiner Box-300A is not part of a standard all-in-one system. Talk to Suncloud before designing a larger system.

Figures are from Deye’s AU documents: the AI-W5.1-B-ESS Series brochure (V1.0, 28 August 2026), the AU single-phase user manual (V1.1.1, 9 July 2026), the AU three-phase user manual (V3.3.1, 10 September 2025), the AU AI-WX-B PDU1/PDU3 user manual (issue 03, 30 March 2026), the all-in-one inverter warranty (Ver1.0) and Deye’s AU/NZ SUN Series 10-year limited warranty (V2.17, July 2026, p.3), which lists all 12 AU all-in-one models. A later three-phase print (Ver 1.1.0, 20 November 2025) lists the AU model names but prints IEC and European grid codes instead of AS/NZS 4777.2, so the V3.3.1 AU edition is linked here. The battery tables inside both linked inverter manuals still print the superseded 4.6 kWh / 90% DoD figures; the current battery figures (5.12 kWh usable at 100% DoD) are on the AI-W5.1-B battery page. The PDU manual’s PDU3 installation steps allow up to six modules per cluster, but the newer AU brochure (August 2026) and AU part list (September 2026) limit the inverter stack to five — design to five. Confirm the exact model variant with Suncloud before quoting or commissioning.