How does Deye parallel stacking work?

Deye inverters connect in parallel via a shared CAN bus — one master and multiple slaves. The master synchronizes AC frequency and phase. SUN-5K/8K/12K support up to 16 units (maximum 80/128/192 kW). For 3-phase systems, units are arranged in groups of 3 (one per phase).

What batteries are compatible with Deye inverters?

Deye natively supports Pylontech, BYD, Dyness, and Hubble batteries via CAN bus BMS, enabling automatic charge/discharge management. The SUN-5K-SG03LP1 is particularly popular with Pylontech US5000 as the global go-to off-grid budget stack.

Can Deye inverters run without a battery?

Yes — Deye SUN-5K/8K/12K can operate in grid-tied mode without a battery. Battery can be added later. In off-grid mode (no grid), a battery is required — the inverter cannot stabilize loads from solar alone without a battery to buffer the DC bus.

Deye Inverter Calculator

Globally dominant off-grid and hybrid inverter — enter continuous load (kW), system type (off-grid/hybrid/commercial), parallel units (up to 16), and battery brand to get your Deye SUN-5K, SUN-8K, SUN-12K, or SUN-50K model, total capacity up to 192 kW, cost ($0.10–0.20/W), and native Pylontech/BYD/Dyness/Hubble BMS support.

System inputs

Continuous load?

System type?

Parallel units?

units

Battery brand?

Warranty?

Deye inverter results

Recommendation

1x SUN-5K-SG03LP1 (5 kW single-phase hybrid) — covers your 4 kW load with headroom. Globally proven, 30–40% cheaper than SMA/Victron equivalents.

Metric	Value
Recommended model	SUN-5K-SG03LP1 (5 kW single-phase hybrid)
Units in parallel	1 unit(s)
Total output capacity	5 kW continuous
Max expandable capacity	80 kW (16 units)
Phase	1-phase
Off-grid capable	Yes — full island mode
Battery voltage	48V standard (LiFePO4 compatible)
Cost per unit	$700
Total system cost range	$600 – $800
Cost per watt	$0.14/W
Warranty	5 years
Battery compatibility	Native CAN/RS485 BMS support for Pylontech — no additional configuration
Monitoring	Deye Cloud — real-time monitoring, mobile app, web portal
Model description	Most popular Deye — single-phase 5 kW hybrid, 48V battery, off-grid + grid-tied, global bestseller

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How to Use This Calculator

Enter continuous load and system type

Enter your total continuous power draw in kW — the sum of all appliances that will run simultaneously. Select your system type: off-grid (no grid connection, battery-only), hybrid (grid plus battery backup), or commercial (50 kW+). The calculator selects the best-fit Deye model and determines how many parallel units you need.

Understand parallel stacking

Deye inverters can be stacked in parallel up to 16 units per model, reaching up to 192 kW from 16x SUN-12K units or 80 kW from 16x SUN-5K units. Each unit communicates on a shared CAN bus, synchronizing phase and frequency. Parallel stacking is used for large loads that exceed a single unit's capacity, or for redundancy where losing one unit doesn't shut down the system.

Select your battery brand

Deye inverters support Pylontech, BYD, Dyness, and Hubble batteries via native CAN BMS communication. This enables automatic state-of-charge management, prevents overcharging, and provides cell-level data to the inverter. Always use the battery brand's recommended CAN cable and verify the exact firmware version with your installer.

The Formula

Units Needed = ⌈Continuous Load kW ÷ Model kW⌉ Total Output = Parallel Units × Model kW Max Expandable = Model Max Parallel × Model kW Cost per Unit = Model kW × 1000 × $/W Total Cost Range = Units × Model kW × 1000 × ($/W ± $0.02)

Deye recommends sizing the inverter at 100–125% of your continuous load for thermal headroom. The SUN-5K-SG03LP1 handles 5 kW continuous and approximately 10 kW surge for motor starting. For systems with high-surge appliances (air conditioners, well pumps), size the inverter at 1.25–1.5x the running wattage. Each parallel unit adds a full inverter output — 2x SUN-5K = 10 kW continuous, 4x SUN-12K = 48 kW continuous.

Example

Ndidi — 20 kW 3-phase hybrid system, Nigeria off-grid, Pylontech batteries

Ndidi's business in Lagos requires reliable 20 kW 3-phase power for manufacturing equipment. The grid is unreliable — she needs a full off-grid capable hybrid system with Pylontech battery backup.

Continuous load20 kW

System typeHybrid (3-phase)

Parallel units2

Battery brandPylontech

Results

Recommended modelSUN-12K-SG04LP3 (12 kW 3-phase)

Units in parallel2 (24 kW total)

Expandable to192 kW (16 units max)

Cost range~$4,700 – $5,500

Pylontech supportNative CAN BMS

Warranty5yr standard (10yr available)

Ndidi's 2x SUN-12K stack delivers 24 kW continuous — 20% headroom above her 20 kW load. At $0.17/W for 24 kW total, the Deye inverter hardware costs approximately $5,000, compared to equivalent Victron Quattro or SMA Sunny Island systems at $15,000–$25,000. Deye is the globally dominant choice for budget-critical off-grid and hybrid installs in Africa, Asia, and Latin America.

Deye Model Comparison

Spec	SUN-5K	SUN-8K-EU	SUN-12K	SUN-50K
Output (kW)	5	8	12	50
Phase	1-phase	3-phase	3-phase	3-phase
Max parallel	16 units	16 units	16 units	4 units
Max parallel kW	80 kW	128 kW	192 kW	200 kW
Off-grid	Yes	Yes	Yes	Grid-tied

FAQ

Is Deye a reliable inverter brand for off-grid systems? ▼

Deye (Ningbo Deye Inverter Technology Co.) is a publicly listed Chinese inverter manufacturer (Shenzhen Stock Exchange: 605117) founded in 2007. They have shipped millions of hybrid and off-grid inverters globally and are particularly dominant in Africa, Latin America, Southeast Asia, and Australia — markets where grid reliability is poor and off-grid or hybrid systems are essential. The SUN-5K-SG03LP1 specifically has become one of the most-installed hybrid inverter models worldwide. Deye holds CE, TUV, VDE, G98/G99, and C10/11 (South Africa) certifications. Reliability is generally good for the price point, though service networks outside China are developing. Many users in South Africa, Nigeria, and Pakistan report 3–5 years of trouble-free operation.

What is the relationship between Deye and Sunsynk inverters? ▼

Sunsynk inverters are manufactured by Deye with Sunsynk branding. Sunsynk is a UK-based company that rebadges Deye hardware for the European and African markets, adding localized support, warranty, and app integration. The hardware inside is functionally identical. Sunsynk has invested heavily in UK and South Africa installer networks and customer support, making it the preferred choice in those markets despite a small price premium over direct Deye. If you're in the UK or South Africa and prioritize local support, Sunsynk may be worth the premium. For direct cost savings and global availability, Deye provides equivalent hardware.

How does parallel stacking work with Deye inverters? ▼

Deye parallel stacking connects multiple inverter units via a shared CAN bus communication cable. One unit is designated as the master; the others are slaves. The master synchronizes AC frequency and phase across all units, ensuring they work together as a single larger inverter. Each unit still has its own MPPT inputs (connected to separate string arrays or split from the same array), and all units share the same battery bank. Maximum parallel count varies by model: SUN-5K/8K/12K support up to 16 units; SUN-50K supports up to 4 units. For 3-phase systems, units are arranged in groups of 3 (one per phase), so a 3-phase stack uses 3, 6, 9, or 12 units.

Can Deye run without a battery (grid-tied only)? ▼

Yes — Deye SUN-5K/8K/12K can operate in grid-tied mode without a battery connected. In this mode, the inverter functions like a standard string inverter — solar production flows directly to your loads and excess is exported to the grid. Battery can be added later without replacing the inverter. In off-grid mode (no grid connection), a battery is required — the inverter cannot run loads from solar alone without a battery to stabilize the DC bus and handle load fluctuations. Deye off-grid mode also requires panels to be generating power; a battery alone without solar input will be drained without recharging.

What makes Deye so popular globally compared to Victron or SMA? ▼

Three factors: price, features, and parallel capacity. Deye's SUN-5K costs approximately $700–900 retail — compared to Victron Multiplus II 5kVA at $1,200–1,500 or SMA Sunny Island 6H at $3,000+. For the price, Deye includes off-grid capability, battery BMS integration, parallel stacking, Wi-Fi monitoring, and grid-tie — features that cost 2–4x more from Western brands. The trade-offs are real: Victron has a significantly more mature ecosystem, better documentation, and more available certified installers globally. SMA has a longer reliability track record. Deye wins on pure value for cost-sensitive markets.

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