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MARSTEK MARS I PLUS

MARSTEK MARS I PLUS inverter and battery stack on a carport wall of a Batangas home with rooftop solar, homeowner checking the app
MARS I PLUS: 6-in-1 550 V V-Boost 6 kW Single-Phase Residential ESS · Silvera Solar Power (AI-generated scene, official product design)

What it is: the MARS I PLUS is an all-in-one single-phase residential energy storage system. A hybrid inverter with 2 MPPT solar inputs, grid, backup (EPS), generator and EV-charger terminals sits on top of a stack of MARS I PLUS V-Boost 5.12 kWh LFP battery modules. The datasheet sells it as "6-in-1" with 5.12–30.72 kWh capacity. The Philippine SRP "full set" is 1 × 6 kW inverter + 3 batteries (15.36 kWh).

Who it's for: new solar installations and homes that want one integrated system covering solar, battery, grid, backup and generator, installed and commissioned by authorised ESS professionals.

6 kWInverter (largest model)
5.12 kWhPer battery module
6 kW + 15.36 kWhPH full set
12 kWMax PV (6 kW model)
<10 msBackup switchover

Best for​

  • New solar + storage installations where no separate inverter exists ("ideal for new solar installations, no separate inverter needed" per the e-Catalog).
  • Homes that want critical circuits on EPS (backup) loads with fast switchover during brownouts.
  • Customers who want to grow capacity later: 1–6 battery modules per inverter (2–6 on the 6 kW model).
  • Sites with a backup generator (dedicated GEN terminal) or a planned MARSTEK EV charger (EVSE terminal).

Key features​

  • Model range: 3.6 / 4.6 / 5 / 6 kW single-phase hybrid inverters with the MST-MARS I PLUS-5.0KBAT battery module (datasheet, manual §2.1).
  • Scalable: 1–6 battery modules per inverter (6 kW model: 2–6). More than 3 batteries requires an expansion box/kit, and a single stack must not exceed 3 batteries (manual §2.3, §4.3).
  • Two PV MPPTs, 125–500 V MPPT range (datasheet), 550 V max DC input.
  • EPS (backup) loads vs on-grid loads (manual §2.4.1): EPS loads are the critical circuits you choose to keep powered during an outage (e.g. refrigeration, lighting, communications). On-grid loads (e.g. air conditioners, clothes dryers) run only when there is enough surplus after EPS loads are covered. The manual shows both whole-home and partial home backup wiring layouts.
  • Working modes (manual §6.2.2):
    • Self-Consumption: solar first, then battery, then grid. Surplus is exported only if anti-backflow is disabled.
    • AI Mode: select your electricity provider and keep the system online; the AI optimises energy flow. Supported providers are listed on MARSTEK's website.
    • Manual Mode: weekly schedule of up to 6 time slots, each set to Charge, Discharge or Self-Consumption. Unscheduled time is Standby (no battery discharge; surplus PV still charges).
  • Ports (manual §5.1): GRID, EPS, GEN (single-phase generator), EVSE (MARSTEK EV charger) and EVSE CAN, PV1/PV2, DC-BUS / COM (V2X), LAN, RS485 (external EMS / heat pump), METER/CT, PARALLEL, DRM, DI1–DI4, DO1/DO2, 5 V/12 V auxiliary supply, PV switch and system switch.
  • Display: 10.1" LCD plus app (datasheet).
  • Datasheet claims: "Expandable to 24 kW output", IP65, 10-year warranty, MARSTEK AI optimisation.

Product views​

MARS I PLUS renders: left side, front with 10.1-inch display and two 5120 battery modules, right side with PV switch, and rear
Inverter on top of two battery modules: side, front, side and rear. Inverter 628 × 195 × 398 mm; each battery module about 390 mm high (datasheet drawing). · MARSTEK MARS I PLUS datasheet

Specifications​

Inverter: datasheet table​

Source: MARS I PLUS Single-Phase datasheet, spec page (transcribed from the rendered image).

Specification3.6KSP4.6KSP5KSP6KSP
ModelMST-MARS I PLUS-3.6KSPMST-MARS I PLUS-4.6KSPMST-MARS I PLUS-5KSPMST-MARS I PLUS-6KSP
PV input
Max. PV power7.2 kW9.2 kW10 kW12 kW
Max. DC input voltage550 V550 V550 V550 V
Nominal DC input voltage360 V360 V360 V360 V
Start-up voltage150 V150 V150 V150 V
MPPT voltage range125–500 V125–500 V125–500 V125–500 V
Number of MPP trackers2222
PV strings per MPPT1111
Max. input current per MPPT16 A16 A16 A16 A
Max. short-circuit current per MPPT20.8 A20.8 A20.8 A20.8 A
AC output and input (on-grid)
Nominal output power3.6 kW4.6 kW5 kW6 kW
Max. output apparent power4 kVA5.1 kVA5.5 kVA6.6 kVA
Nominal output current15.7 A20 A21.7 A26.1 A
Max. output current18 A23 A25 A30 A
Nominal output voltage230 V230 V230 V230 V
Nominal grid frequency50 / 60 Hz50 / 60 Hz50 / 60 Hz50 / 60 Hz
Power factor0.8 leading ~ 0.8 lagging←←←
Total current harmonic distortionTHDi <3%←←←
Max. input apparent power5.9 kVA7.5 kVA7.5 kVA7.5 kVA
Max. input current25.7 A32.6 A32.6 A32.6 A
Efficiency
Max. efficiency97.60%97.60%97.60%97.60%
European efficiency97.10%97.10%97.10%97.10%
MPPT efficiency99.60%99.60%99.60%99.60%
Battery conversion efficiency97.00%97.00%97.00%97.00%
Generator
Max. input apparent power5.4 kVA6.9 kVA7.5 kVA7.5 kVA
Nominal input voltage230 Vac230 Vac230 Vac230 Vac
Frequency50 / 60 Hz50 / 60 Hz50 / 60 Hz50 / 60 Hz
Max. input current23.5 A30 A32.6 A32.6 A
AC output (backup)
Nominal output power3.6 kW4.6 kW5 kW6 kW
Peak output current (1 s)150%–200%←←←
Nominal output voltage230 V230 V230 V230 V
Frequency (row labelled "Power Factor" in the datasheet)50 / 60 Hz←←←
Total voltage harmonic distortionTHDv <3%←←←
Backup switch disruption time<10 ms←←←
Battery connection
Battery module modelMST-MARS I PLUS-5.0KBAT←←←
Modules per inverter1–6 pcs←←←
Nominal voltage of battery module400 V←←←
Voltage range of battery module350–550 V←←←
ProtectionInsulation monitoring, residual current monitoring, anti-islanding, DC reverse-polarity protection, AC OV/OC/SC protection, Type II DC/AC surge protection
General data
Dimensions (W/H/D)628 × 195 × 398 mm←←←
Weight35 kg←←←
Storage temperature-40 °C to 70 °C←←←
Operating temperature-25 °C to 60 °C←←←
Relative humidity0–100%←←←
Max. operating altitude4,000 m, derating from 2,000 m←←←
CoolingNatural cooling←←←
Standby power consumption<35 W←←←
Ingress protectionIP65←←←
Noise level<30 dB←←←
Display10.1" LCD, App←←←
CommunicationRS-485 for meter, RS-485 for heat pump, parallel CAN × 2, DC BUS CAN, RS-485 for EMS, Wi-Fi / Bluetooth / Ethernet, battery access CAN (internal)
General I/ODI × 4, DO × 2, CT × 3, +5 V power, +12 V power, DRAM
Standards
SafetyIEC/EN 62109-1
EMCIEC/EN 61000-6-1~4 Class B
On-gridEN 50549-1:2019, VDE 4105:2018, VDE 0126-1-1, EN 50438, Italy CEI 0-21

"←" means the same value as the column to the left (the datasheet merges these cells across all models).

Additional values from the manual​

Source: MARS I PLUS user manual, Appendix D Parameters. The manual names the inverters MST-3.6KSH-M0 … MST-6KSH-M0 in the parameter table and MST-3.6KSP-M0 … MST-6KSP-M0 elsewhere.

Specification3.6 kW4.6 kW5 kW6 kW
Backup max. output apparent power3.8 kVA4.8 kVA5.3 kVA6.3 kVA
Backup rated output current15.7 A20.0 A21.7 A26.1 A
Backup max. output current23.4 A (5.4 kW, 1 s)30 A (6.9 kW, 1 s)32.6 A (7.5 kW, 1 s)39.1 A (9 kW, 1 s)
EVSE output (rated power / current)3.6 kW / 15.7 A4.6 kW / 20.0 A5 kW / 21.7 A6 kW / 26.1 A
Specification (all models)Value per manual
Grid voltage range (on-grid)170–280 V
Grid frequency range45–55 Hz (50 Hz) / 55–65 Hz (60 Hz)
Generator input voltage / frequency range170–280 V / 30–70 Hz
Anti feed-in protectionConfigurable
Backup overload behaviour105–125% load: alarm and shutdown after 10 min; 125–150%: after 1 min; above 150%: after 1 s
DC terminal type / PV DC isolation switchPush-in / standard
Overvoltage categoryDC: Class II; AC: Class III (general)
Battery parametersLFP, rated 400 V, range 350–500 V, max. charge/discharge power 6 kW, max. charge/discharge current 17.1 A, capacity 5.12 kWh (per module)
Battery module dimensions (drawing)628 × 196 mm footprint; drawing heights 390 mm / 417 mm / 445 mm (details on the manual's drawing)
Battery handlingBattery module is marked "> 55 kg"; carry with the handles
Storage conditions (§3.2)-40 to 70 °C with 5–95% RH, and -20 to 35 °C with 10–80% RH, as listed for the inverters and the battery module
Pollution degreePD2
Warranty (manual / warranty card)10 years. Confirm local warranty terms with Silvera Solar Power.
Source conflicts: datasheet vs manual
ItemDatasheetManual
MPPT voltage range125–500 V120–500 V
DC input voltageMax 550 V, nominal 360 VLists 550 V and 650 V for max / rated DC input (extracted order unclear)
Backup THDv<3%<2%
Battery module voltage range350–550 V350–500 V
Inverter depth195 mm (628 × 195 × 398)196 mm (628 × 196 × 398)
Altitude4,000 m, derating from 2,000 m">2000 m derating"
CommunicationLong list (see table)Wi-Fi, LAN, CAN, RS-485
Inverter model suffixKSPKSH and KSP
Battery modelMST-MARS I PLUS-5.0KBAT5.0KBAT and 5KBAT

Prefer the latest engineering document when designing a system, and confirm with MARSTEK / Silvera technical support before relying on edge values (especially PV string voltage).

Naming in the SRP flyer

The SRP flyer labels the parts "MARS I INVERTER" and "MARS I BATTERY". The engineering documents call them MARS I PLUS. Treat them as the same product family, but confirm part numbers on the quotation.

Price (SRP)​

MARS I PLUS full set SRP flyer showing ₱390,000 for 6 kW inverter plus three 5.12 kWh batteries
MARS I PLUS Full Set (6 kW + 15.36 kWh): ₱390,000 (original ₱445,000); MARS I inverter ₱90,000; each MARS I battery ₱100,000 · MARSTEK Flyers – SRP (Drive, June 2026)

Per the SRP flyer in Drive:

ItemSRP
MARS I PLUS Full Set: 1 × 6 kW hybrid inverter + 3 × 5.12 kWh batteries₱390,000 (original ₱445,000)
MARS I inverter (individual)₱90,000
MARS I battery (each)₱100,000

The flyer does not say whether installation is included, so clarify this on every quotation. Confirm current pricing with Silvera Solar Power before quoting. See the price list.

Installation & safety​

Professional installation only

The manual states the whole system shall be installed and configured by professional technicians who are company-authorised, familiar with local standards and electrical safety regulations, formally trained and certified in ESS installation, and experienced enough to identify risks and complete commissioning and documentation. After installation, users must not relocate components, change wiring or non-user settings, or tamper with the smart meter, CT or distribution-box connections.

From the MARS I PLUS manual (§4 Mechanical installation, symbols and safety sections):

  • Indoor installation is strongly recommended. If outdoor installation is unavoidable, place the unit under a protective structure (e.g. a waterproof canopy) against prolonged sun, rain, snow or hail.
  • Avoid flammable liquids, gases or aerosols; sealed enclosures or cramped spaces; coastal or high-salt air; excessive dust, conductive pollution or corrosive fumes. Ensure enough airflow around the heat sinks.
  • Mounting structure: non-combustible or fire-resistant (concrete, brick, metal), strong enough for the whole system's weight for its lifetime, and solid enough for drilling and anchoring.
  • Clearances: the installation-space diagram shows minimum clearances of ≥300 mm, ≥500 mm, ≥500 mm and ≥800 mm around the system. Follow the manual's drawing for which side each applies to.
  • Stacking: maximum 3 batteries per stack. For more than 3 batteries an expansion box/kit is needed. Battery modules weigh over 55 kg, so use the handles and handle latches.
  • Required PPE: goggles, protective gloves, safety hat, dust mask, insulating gloves and insulating shoes. Installation tools listed: power drill, screwdriver set, marker, tape measure, adjustable pipe wrench, ferrule crimp tool, level, wire stripper, wire cutter, hammer, heat-shrink tube, crimping pliers, RJ45 crimp tool, cable ties and heat gun.
  • High voltage: do not open the casing while operating. Internal components retain hazardous energy; wait at least 10 minutes after power-off before work. Hot surfaces in the heat-sink area.
  • Unauthorised use of the auxiliary 5 V/12 V supply interface is prohibited (risk of short circuit or overload).
  • Storage over 6 months requires inspection and, for batteries, a charge-discharge maintenance cycle.

Sources​