DC-DC Converter — DC/DC converter for connecting batteries to Sunny Central

Country: Germany · Model: DC-DC Converter

The DPS-500 DC/DC converter connects storage to the DC bus of a Sunny Central UP central inverter and carries 500 kW continuously at 1,000 V or 600 kW at 1,200–1,500 V. Up to 6 units go on one inverter, at large PV plants where a battery is added without a separate PCS.

Connection: up to 6 converters per Sunny Central UP
Purpose: DC coupling of storage with the PV plant, recovery of clipped energy

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Technical specifications

More from the manufacturer’s documentation
Connection	up to 6 converters per Sunny Central UP
Purpose	DC coupling of storage with the PV plant, recovery of clipped energy
Model	DPS-500
Max. continuous power (35 °C)	500 kW at 1,000 V DC; 600 kW at 1,200–1,500 V DC
Battery / PV voltage range	550–1,500 V / 550–1,500 V
Max. continuous current	±500 A
Supply voltage	230 V, 1-ph, 50 Hz, 600 VA (or 120 / 277 V, 60 Hz)
Power and energy measurement accuracy	< 1.5%; < 0.5% with Metering Kit (DC meter 0.2%)
Average efficiency	98.2%
Battery technology	all common technologies; 1,500 V batteries
Operating mode	step-up/step-down, 4-quadrant, battery charge/discharge
Dimensions (W × H × D)	960.1 × 2,029.5 × 983.0 mm
Weight	653 kg
Operating temperature	−25 °C to +55 °C
Storage temperature	−40 °C to +70 °C
Noise emission (10 m)	< 65 dB(A)
Cooling	forced air, 2,720 m³/h
Degree of protection	IP54 / UL Type 3R; outdoor use
Relative humidity	up to 95% non-condensing
Installation altitude	up to 1,000 m (optional 2,000 / 3,000 m)
Communication	Modbus TCP/IP; bottom cable entry
Warranty	5 years (optional 10 / 15 years)
Standards	CE, EN 62109-1, IEC 62109-1, IEC 61000-6-2, CISPR 11, UL 1741, UL 62109-1, IEEE 693, CSA 22.2 #107, FCC Part 15 Class A
Customs codes (for reference)
HS code	8504.40
UKTZED code (Ukraine)	8504409000
CN code (EU)	85044095

Specifications are taken from the manufacturer’s technical documentation. Updated 10/31/2026. Customs codes are for reference only; the final code is determined at customs declaration for the specific model.

Description

With DC coupling, the battery and the PV modules share one central inverter. When generation exceeds the inverter rating, the clipped energy goes into storage instead of being lost, and later the battery feeds it to the grid through the same Sunny Central UP. The layout also suits retrofits at existing plants. The converter runs in four quadrants as a step-up and step-down stage, with a 550–1,500 V range on both battery and PV sides, current up to ±500 A and 98.2% average efficiency. It accepts all common battery technologies, 1,500 V batteries included. The 960.1 × 2,029.5 × 983.0 mm cabinet weighs 653 kg, is cooled by forced air at 2,720 m³/h and stays below 65 dB(A) at 10 m. IP54 / UL Type 3R permits open-air installation at −25 °C to +55 °C, with bottom cable entry. Auxiliary power is 230 V, 50 Hz, 600 VA, and the plant controller talks to it over Modbus TCP/IP.

How to choose

Size the number of converters by storage power and by how much energy the inverter clips. With a 1,200–1,500 V battery each unit carries 600 kW instead of 500 kW at 1,000 V, so fewer converters are needed. For energy accounting, the optional Metering Kit cuts measurement error from 1.5% to 0.5%. If storage is AC-coupled apart from the array, it needs its own PCS instead, such as the Sunny Central Storage UP up to 3,960 kVA or the Sunny Highpower Storage at 100–180 kVA.