Deye — SUN-5K-SG04LP3-EU
A well-specified low-voltage hybrid inverter on paper — the India-market SKU and local service backing are what you still need to confirm.
Reviewed 23 August 2026
The SUN-5K-SG04LP3-EU is a three-phase, low-voltage (48V-class battery) hybrid inverter from Deye — meaning it handles solar generation, grid export/import, and battery charge/discharge in one unit, rather than needing a separate battery inverter. It supports a 1.5:1 DC/AC oversize ratio (up to 7,500W of PV feeding a 5,000W AC output), which lets you size a larger array than the rated output without extra hardware.
On paper, the numbers are strong: 97.6% max efficiency, IP65 outdoor-rated enclosure, and the ability to AC-couple onto an existing grid-tied solar system to retrofit battery backup without rewiring the DC side. It also supports charging from a diesel generator and parallels up to 10 units for larger systems.
The one thing this specific datasheet cannot tell you: it is the "-EU" (European market) version, certified against European grid codes (VDE, G98/G99, CEI 0-21, and similar). It does not confirm what BIS/CEA certification the India-market equivalent carries, or which local service network backs it — both of which matter more for a 10-year hybrid inverter than any spec on this page.
For Installers & Engineers
Deeper technical detail beyond the homeowner-facing summary above.
Charging strategy for lithium batteries is "self-adaption to BMS" over CAN/RS485/RS232 — the inverter negotiates charge parameters directly with the battery’s BMS rather than using fixed voltage setpoints. This is the correct modern approach, but it also means BMS communication-protocol compatibility is the single most common real-world integration failure point — confirm your battery brand is on Deye’s tested-compatibility list before pairing, not just that both units are "Lithium/LFP compatible" in marketing copy.
Battery voltage range is 40–60V (48V nominal), max charge/discharge current 120A on the 5K unit — this is the same low-voltage architecture most Indian installers are already familiar with from lead-acid inverter systems, which lowers the integration-error risk versus a high-voltage (200V+) hybrid architecture.
Max PV input power is 7,500W against a 5,000W rated AC output (1.5:1 DC/AC ratio) — useful for extracting more energy across a full day from an array that would otherwise clip, but only genuinely useful if your roof has the space and orientation to use the extra DC capacity, not as a default oversizing rule.
Operating range is rated to −40°C to +60°C with derating above 45°C — comfortably wide for Indian ambient conditions, though enclosure placement (direct sun exposure on a terrace parapet, for instance) still meaningfully affects real internal temperature and long-run reliability.
The Scorecard
How we scoreConversion Efficiency
97.6% max / 97.0% Euro-weighted and >99% MPPT efficiency are genuinely strong, competitive with tier-1 string and hybrid inverters.
Reliability & Build
Solid protection feature set, wide operating temperature range, and IP65 rating on paper — though real-world field data specifically in Indian conditions is thinner than for more established brands here.
Monitoring & Software
Flexible monitoring options (WiFi/Bluetooth/4G/LAN/GPRS) and a full RS485/RS232/CAN interface set for integration.
Service Network & Support
Deye’s India service network is real but newer and still expanding — and this specific datasheet being the EU variant means the India SKU’s certification needs separate confirmation, not just service reach.
Value for Money
Feature set (AC-coupling, wide DC/AC ratio, high efficiency) is competitive for the hybrid-inverter category, but we did not independently source current India retail pricing to judge ₹/kW value with confidence.
Strengths
- Strong headline efficiency (97.6% max / 97.0% Euro-weighted) and >99% MPPT efficiency
- AC-coupling support — genuinely useful for retrofitting battery backup onto an existing grid-tied system
- 1.5:1 DC/AC oversize ratio and up to 10-unit parallel operation for scaling
- IP65 outdoor rating and a wide −40°C to +60°C operating range
Watch-outs
- This datasheet is the EU-market variant — the India-market SKU’s exact model suffix, BIS/CEA certification, and grid-code compliance are not confirmed by this document; ask your vendor for the India-specific datasheet
- Warranty is listed as "5 years / 10 years, depends on the final installation site" — get the exact applicable term in writing before you buy, not just "10-year warranty" verbally
- Deye’s India service network is newer and still expanding compared to more established brands — confirm your nearest authorised service point before committing, especially outside major cities
- "Self-adaption to BMS" charging requires your specific battery brand to be on Deye’s tested-compatibility list — untested pairings are a real integration risk, not just a paperwork formality
Key Specifications
| Rated AC output | 5,000 W (5,500 VA max apparent power) |
|---|---|
| Max PV input power / MPPTs | 7,500 W · 2 MPPTs (1+1 strings) |
| MPPT voltage range | 200–650 V (rated 550V, max 800V) |
| Battery voltage range / max current | 40–60V (48V nominal) · 120A charge/discharge |
| Max efficiency / Euro efficiency | 97.6% / 97.0% |
| IP rating / operating temp | IP65 · −40°C to +60°C (derates above 45°C) |
| Dimensions / weight | 422×658×254mm · 38 kg |
| Warranty | 5 or 10 years — depends on installation site; confirm in writing |
| Grid codes shown on datasheet | IEC 61727, IEC 62116, CEI 0-21, EN 50549, G98/G99 (EU market standards) |
| India-market certification (BIS/CEA) | Not stated on this (EU-variant) datasheet — confirm the India SKU separately |
Specifications marked “datasheet-stated” are manufacturer figures we have not independently measured. Always confirm the exact model on its current datasheet before purchase.
Who It’s For
- Homeowners or MSMEs retrofitting battery backup onto an existing grid-tied solar system via AC-coupling
- Buyers comfortable with a 48V low-voltage battery architecture who want a single hybrid unit rather than separate grid-tie and battery inverters
Our Verdict
A genuinely well-specified low-voltage hybrid inverter on the numbers — strong efficiency, real AC-coupling retrofit capability, and sensible protection features. But this exact datasheet is the EU-market version, and the two things that matter most for a 10-year purchase — the India SKU’s certification and your local service backing — are exactly what it cannot tell you. Get both in writing before you buy.
Frequently Asked Questions
Is this the exact Deye model sold in India?
The datasheet reviewed here is the "-EU" (European market) variant, certified against European grid codes. Deye sells India-market variants through local distributors, but we could not independently confirm the exact India SKU name, its BIS/CEA certification, or whether all specs carry over unchanged. Ask your vendor for the India-specific datasheet before buying.
What does "self-adaption to BMS" mean for battery compatibility?
The inverter communicates directly with your battery’s BMS (over CAN/RS485/RS232) to set charge parameters dynamically, rather than using fixed voltage points. This is the correct modern approach, but it means your specific battery brand needs to be on Deye’s tested-compatibility list — an untested pairing is a real integration risk.
Can I add this to my existing grid-tied solar system?
Yes — it supports AC-coupling, which lets you retrofit battery backup onto an existing grid-tied inverter setup without rewiring the DC (panel) side. This is one of its more genuinely useful features for someone who already has solar and wants to add storage later.
Data Provenance
- Verified on
- 23 August 2026
- ALMM status
- Unknown — verify directly
- Source datasheet
- View official manufacturer datasheet
No paid rankings, no affiliate links. No manufacturer can pay for a score or a place on this page. We review published specifications and field reality against a transparent methodology — we are not a laboratory, and we never present a number as a test we did not run.