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MarPower Energy Storage Inverters, the optimal battery interface for your on board Hybrid application.


Connecting a battery to the AC-bus by means of the ESI:

  • Increases the energy e ciency of the generator with it’s peakshaving functions
  • Improves the power quality on board
  • Provides reliable power by means of its UPS function and enables to have a fully silent ship.

When using a DC-bus on board, the ESI is the ultimate AC/DC shore power converter.

Energy Storage Inverter

The MarPower ESI energy storage inverter is the ultimate building brick for energy storage, UPS and peakshaving systems due to its small size and extremely low weight and added functionality. This bi-directional and ultra-compact system converts the energy stored in batteries into a reliable power source to safeguard quality of power on board of yachts and mega yachts. But also, when having a high voltage DC-bus on board, the ESI can perfectly be used as a galvanic isolated shore converter or to create the 3-phase + neutral from the DC-bus.

  • World’s smallest and lightest Energy
  • Storage Inverter
  • Small size: 0.5 kW / litre, this is up to 60 % reduction (compared to
  • LF-transformer solutions)
  • Low weight: 0.6 kW / kg, this is up to 70% reduction (compared to LF-transformer solutions).
  • Easy installation and maintenance
  • The solution for new built and refi t
  • Redundancy
  • Optimal logistics
  • Worldwide service and support


input voltage 565-750V (other voltage on request)

nom. current charge mode 105A

nom. current inverter mode 115A


voltage nominal 3 x 400V rms + neutral (other voltages on request)

voltage DC Power supply 170-520V

frequency 50 Hz (other frequencies on request)

frequency DC Power supply 40-70-Hz

nom. system power 30kVA-900kVA

nom. module power 30-40-50-60kVA

power derating without liquid cooling derating till 50%

units in parallel up to 20 modules

overload 120% 15 min

150% 10 sec

voltage distortion < 3%

voltage variation ± 1,5% (at min max load)

frequency accuracy ± 0,05%

e ciency > 93% (at nom. Battery voltage and full load)

power losses typical 70% to liquid 30% to air


LCD display



hard wired IO potential free contacts


Power Weight Size (HxWxD) in mm**

60kVA* (tower) 130 kg 900 x 412 x 660

120kVA* 300 kg 945 x 860 x 660

180kVA* 435 kg 1245 x 860 x 660

240kVA* 575 kg 1645 x 860 x 660

300kVA* 710 kg 1945 x 860 x 660

* Uout = 400V cos phi = 0,8 ** W excl. Water connection

Cooling forced air + valve controlled liquid

(non corrosive, 5-6 ltr./min fl ow and between 0°C and 35°C)

Protection degree IP22 (higher IP value on request)

Temperature 0-45ºC, above reduced power

Humidity 0-95% non condensing

Colour Ral 9010 (other colours on request)

Noise < 60dBA at 1 mtr

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