Victron 3kVA 48V Off-Grid Energy System with 10.2kWh LiFePO₄ Battery and 5.5-6.5kW Generator - No Solar Required

   
By Victron Energy
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Victron 3kVA 48V Off-Grid Energy System with 10.2kWh LiFePO₄ Battery and 5.5–6.5kW Generator – No Solar Required

  • Run suitable off-grid loads without solar panels, using battery power between generator charging sessions.
  • Victron MultiPlus-II provides 230V pure sine wave power, rated at 3kVA / 2.4kW continuously at 25°C.
  • Dyness Powerbox G2 provides 10.24kWh nominal lithium storage, paired with a separately specified 5.5–6.5kW-class generator.

Off-grid battery and generator power without solar

This Victron 3kVA off-grid energy system combines a MultiPlus-II 48/3000/35-32 inverter-charger, a Dyness Powerbox G2 LiFePO₄ battery and a selected generator in the 5.5–6.5kW class. The generator supplies accepted AC power and recharges the battery through the inverter-charger. When it stops, suitable connected loads continue to operate from stored energy without requiring solar panels.

Key features

  • No solar required: suitable where shading, limited space, seasonal use or site restrictions make a solar array impractical.
  • Battery operation between charging sessions: supply suitable loads without running the generator continuously. Actual generator hours depend on consumption and charging requirements.
  • Managed generator loading: PowerControl limits AC input demand, while PowerAssist can supplement an accepted generator supply with battery power when correctly configured.
  • Dyness lithium storage: 10.24kWh nominal capacity, IP65 protection and CAN/RS485 communication, with floor- or wall-mounted installation options.

Where to use

Consider this system for remote offices, cabins, rural outbuildings, seasonal accommodation, communications equipment and selected small-business loads where grid power or solar generation is unavailable or unsuitable.

Check daily energy demand, simultaneous loads and starting currents before specifying the package. The inverter’s continuous battery-powered output is 2.4kW at 25°C; a larger generator does not increase that battery-only rating.

Appliances such as pumps, compressors, kettles and electric heaters can place substantial demands on a small inverter system. Energian can help assess the intended equipment and identify which loads should operate only while the generator is running.

How the system works

With the generator stopped, the inverter converts battery DC power into 230V AC. When an acceptable generator supply is connected, the MultiPlus-II supplies the loads and uses available input capacity to charge the battery, within the commissioned limits.

The inverter charger is rated at 35A. A larger generator does not increase charging beyond this limit. Generator loads, charging demand and any PowerAssist contribution must be managed within the generator outlet, inverter, battery, cable and protection ratings.

No solar required does not mean no energy input is required: generator fuel replenishes the battery. Runtime, recharge time and fuel use depend on the load profile, generator model and operating settings; no fixed performance figures are guaranteed.

Proposed package contents

Installation and commissioning

This is not a plug-in installation. A qualified electrician must design the generator connection, earthing, protective devices, battery connections and load circuits. Installation can be arranged through trusted partners.

Dyness lists Victron Energy among compatible inverter brands. Confirm the exact battery firmware, approved communication cable, GX requirements and inverter settings before commissioning. Do not assume the inverter’s default charging profile is suitable for the battery.

Automatic generator starting is assumed. It requires a compatible generator and an approved control interface. A combustion generator must operate outdoors in a safe location away from doors, windows and air intakes—not inside the battery or inverter enclosure.

Technical specifications

Inverter specifications follow the attached Victron datasheet’s 48/3000/35-32 model. Battery specifications follow the attached Dyness Powerbox G2 datasheet, version 20241231-EN. Generator-specific data will be added when the model is selected.

Specification Value
System configuration
System type Single-phase, generator-charged off-grid energy system
Solar requirement No solar panels required for the proposed generator/battery operation
Inverter-charger Victron MultiPlus-II 48/3000/35-32, 230V
Battery model Dyness Powerbox G2
Battery chemistry LiFePO₄ / lithium iron phosphate
Nominal battery voltage 51.2V; 48V-class system
Nominal battery capacity 200Ah
Nominal stored energy 10.24kWh, described as approximately 10.2kWh in the product title
Recommended depth of discharge 90%
Energy at 90% discharge allowance — calculated 9.216kWh of nominal battery energy before inverter losses and operating restrictions
Generator selection 5.5–6.5kW class
Future solar integration Possible using separately specified compatible MPPT solar charge controller; the MultiPlus-II does not contain a PV MPPT controller
Victron inverter output
Continuous apparent output at 25°C 3,000VA
Continuous active output at 25°C 2,400W
Continuous active output at 40°C 2,200W
Continuous active output at 65°C 1,700W
Peak inverter power 5,500W; system surge capability also depends on battery voltage, BMS limits, cabling and protection
Output voltage 230V AC ±2%
Output frequency 50Hz ±0.1%
Output waveform Pure sine wave
DC input-voltage range 38–66V DC; actual operation must remain within the connected battery’s permitted range
Maximum inverter efficiency 95% for the 48V 3kVA model
Zero-load consumption 11W
Zero-load consumption in AES mode 7W
Zero-load consumption in Search mode 2W
Maximum apparent feed-in power 3,000VA component rating; grid export is not part of this off-grid package
AC transfer time Less than 20ms, as described by Victron
Victron generator input and charging
AC input-voltage range 187–265V AC
AC input-frequency range 45–65Hz
Maximum AC input current 32A; commission a limit appropriate to the generator, outlet, cable and protection
Transfer-switch rating 32A
Maximum battery charging current 35A, up to 25°C ambient, subject to available AC input and battery limits
Battery temperature sensor Supported; follow the approved lithium battery/BMS configuration
PowerControl Reduces charging demand to respect the configured AC input-current limit
PowerAssist Allows battery power to supplement an accepted AC source when enabled and correctly configured
AC output 1 Main inverter-backed output
AC output 2 32A auxiliary output, available only when accepted AC input is present
Programmable relay Configurable for general alarm, DC undervoltage or generator start/stop signalling
Relay AC contact rating 230V AC / 4A
Relay DC contact rating 4A up to 35V DC; 1A up to 60V DC
Victron monitoring, communication and expansion
VE.Bus communication System integration, remote monitoring and supported parallel/three-phase configurations
General-purpose communication ports 2
Remote on/off Supported
Optional external AC current sensor 50A or 100A, as applicable; does not increase this model’s 32A AC input rating
Remote monitoring Optional Cerbo GX with internet connection to Victron VRM
VRM platform Free remote monitoring platform
Local configuration VEConfigure with suitable computer/interface
Optional Bluetooth VE.Bus Smart Dongle; not assumed included
Parallel/three-phase capability Supported with matching compatible units and a redesigned installation; this listing includes one inverter only
Victron enclosure, environment and standards
Cooling Fan-assisted
Operating temperature −40°C to +65°C; output derating applies
Maximum humidity 95%, non-condensing
Enclosure material and colour Steel, blue RAL 5012
Inverter ingress protection IP22; install in a suitable protected location
Battery terminals M8 bolts
230V AC terminals Screw terminals, up to 13mm² / 6AWG, as stated in the supplied datasheet
Dimensions, H × W × D 499 × 268 × 141mm
Inverter weight 19kg
Protection functions Output short circuit, overload, high/low battery voltage, overtemperature, external 230V at inverter output and excessive DC input ripple
Safety references EN-IEC 60335-1; EN-IEC 60335-2-29; EN-IEC 62109-1; EN-IEC 62109-2
Emission and immunity references EN 55014-1; EN 55014-2; EN-IEC 61000-3-2; EN-IEC 61000-3-3; IEC 61000-6-1, -6-2 and -6-3
UPS and anti-islanding approvals Refer to the applicable model-specific certificates on Victron’s website; no additional approval is inferred for this complete package.
Dyness Powerbox G2 electrical specifications
Battery type LiFePO₄
Nominal battery energy 10.24kWh
Nominal voltage 51.2V
Operating-voltage range 44.8–57.6V
Nominal capacity 200Ah
Nominal charge/discharge power 5.12kW
Max discharge power 10.24kW
Recommended charge/discharge rate 0.5C
Recommended charge/discharge current 100A
Recommended depth of discharge 95%
Battery/inverter power distinction The battery’s power ratings do not increase the inverter’s 2.4kW continuous battery-powered AC output.
Communication CAN / RS485
Wi-Fi module Optional
Dyness Powerbox G2 construction and environment
Battery protection level IP65
Dimensions, W × D × H 700 × 165 × 640mm
Battery net weight 96kg
Installation options Wall-mounted or floor-mounted
Charging-temperature range 0°C to +55°C
Discharging-temperature range −20°C to +55°C
Cold-weather charging Do not charge below the specified minimum cell temperature. A separate approved temperature-management solution is required where necessary.
Published safety features Short-circuit lockout and surge resistance
Battery equalisation feature Manufacturer lists support for mixing modules at different states of charge; follow its approved expansion procedure. This is not permission to enable lead-acid equalisation charging.
Expansion Up to 50 compatible units in parallel
Cycle life Unlimited cycles, 10 years
Certification and safety references listed UN38.3; CE-EMC; IEC62619; IEC62040; UKCA; CEC
Generator selection and complete-system requirements
Generator range 5.5–6.5kW class; one selected generator per package
Required electrical output Compatible single-phase 230V AC supply with sufficient continuous output at the selected outlet
Rating basis Identify continuous and maximum generator ratings separately before quotation.
Single-phase availability A generator’s total three-phase rating must not be treated as its available single-phase output.
Available charging current Limited to the inverter’s 35A charger rating, available generator power and the commissioned battery limits
Generator fuel, tank, noise and runtime To be specified from the selected generator’s manufacturer documents
Generator dimensions and weight To be confirmed for the selected model
Combined inverter and battery weight 115kg, excluding generator, cables, protection equipment and enclosure
Weather protection No single overall IP rating claimed. Each component requires a suitable installation location.
Final commissioning checks Battery communication, charging limits, generator acceptance, load steps, PowerAssist operation, earthing and protective-device coordination

Documents available for download

Shipping

Shipping is available to the UK, Ireland, Africa, the Caribbean and worldwide, subject to destination and transport requirements. If a shipping rate is not shown at checkout, contact us on +44 20 8064 0335 or info@energian.co.uk for a quote.

Delivery access and unloading arrangements must be agreed before dispatch. The battery and generator require appropriate handling equipment.

UK expert support

Energian’s UK team can help assess loads, battery capacity, generator selection and installation requirements. Contact us by phone, email or live chat with questions or support requests, or arrange an in-person consultation at our office. Installation can be arranged through trusted partners.