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victron|SKU:1593017

Victron MultiPlus-II 48/3000 — 3000VA Inverter/Charger with Built-In Transfer Switch

Hybrid Inverter/Charger Built for Grid-Independent Power

3000VA continuous output — Powers essential loads on 48V systems
35A integrated charger — Recharges battery bank from AC source
Sub-20ms transfer switch — Uninterrupted power during grid failures
PowerAssist overload protection — Boosts weak shore or generator power
Remote monitoring ready — Control from phone, tablet, or PC
  • FREE System Design Consultation -- Our engineers size your system for your actual consumption — no guesswork
  • FREE Shipping -- Ships free on all orders, including LTL freight
  • Compatibility Guarantee -- Components pre-vetted to work together — we stand behind the architecture

$877.95

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In the box

  • Victron MultiPlus-II 48/3000 inverter/charger unit
Victron | MultiPlus-II 48/3000 | 48V Input | 3000VA Output 120V | 35A Charger | Transfer Switch
Victron MultiPlus-II 48/3000 — 3000VA Inverter/Charger with Built-In Transfer Switch
$877.95

Hybrid Inverter/Charger Built for Grid-Independent Power

The Victron MultiPlus-II 48/3000 combines a 3000VA 120V inverter and 35A charger in one field-tested unit designed for serious off-grid and backup systems. Its PowerAssist feature automatically prevents AC source overload by reducing charge current and supplementing from your battery bank. With sub-20ms UPS transfer, built-in anti-islanding, and remote monitoring capability, this unit is grid-independent power management that integrates with MPPT solar chargers. Off-grid proven reliability from a brand installers trust.

FREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORT
PowerAssist Overload Protection
Sub-20ms UPS Transfer
Built-In Anti-Islanding
Remote Monitoring Access
3000VA
Output Power
48V
DC Input Voltage
35A
Charger Current
No More Blackout Blind Spots in Your Power Chain

No More Blackout Blind Spots in Your Power Chain

The grid-tied system your neighbor bought goes dark the instant the utility fails. That is the exact problem the MultiPlus-II was engineered to eliminate. Its built-in transfer switch takes over in under 20 milliseconds — your refrigerator, well pump, and lights never notice the grid dropped. Unlike generic marketplace inverters with no integration path, this unit is part of a system Off Grid Vault pre-vets for component compatibility. Every connection is accounted for: the inverter talks to your battery bank, the charger manages incoming AC, and PowerAssist prevents overload when your source is limited. No guesswork, no mismatched components, no blind spots.

Weak Generator or Limited Shore Power Becomes a Non-Issue

Weak Generator or Limited Shore Power Becomes a Non-Issue

PowerAssist is the feature that separates a real inverter/charger from a basic unit. When your AC source — whether a generator, shore power, or weak grid connection — cannot handle the load, the MultiPlus-II automatically reduces battery charging first, then supplements with battery power to prevent overload. This means a smaller generator can run your well pump surge without tripping. You are not forced to oversize your generator or shore connection just to handle peak demand. The external current transformer option adds PowerControl capability, letting you optimize self-consumption by sensing exactly how much power your home is drawing from the grid and adjusting accordingly.

Full Visibility From Any Device, Anywhere On Your Property

Full Visibility From Any Device, Anywhere On Your Property

Remote monitoring and control is built into the MultiPlus-II architecture. Access your system from a phone, tablet, laptop, or PC across multiple operating systems. You can check battery state of charge, charger status, inverter output, and AC input behavior without walking out to your power cabinet. Combine this unit with Victron MPPT solar chargers or grid-tie PV inverters to build a complete energy storage system. Built-in anti-islanding and a growing list of country approvals mean this inverter meets compliance requirements that generic units simply do not address. Off Grid Vault includes a free system design consultation with every purchase, so your integration path is clear before you wire a single connection.

System Compatibility

Confirm your setup matches these requirements before integrating the MultiPlus-II 48/3000.

  • 48V DC battery bank required
  • 120V AC output for North American circuits
  • External current transformer port available for PowerControl

Where This Unit Performs

The MultiPlus-II 48/3000 is built for setups that demand reliable hybrid inverter/charger performance.

Cabin & Homestead Systems
Energy Storage Integration
Emergency Backup Power

Full specifications

At a glance

Dimensions
See product page
Compliance
See product page
Warranty
See product page
Full specifications9 data points across 4 categories

Dimensions

Physical DimensionsSee product page
WeightSee product page

Power & Performance

DC Input48V
AC Output3000VA 120V
Charger35A
UPS Transfer Timeless than 20milliseconds

Materials

ConstructionSee product page

Compliance & Warranty

CertificationsSee product page
WarrantySee product page

The Off Grid Vault Promise

Every product we carry is vetted for real-world performance. The MultiPlus-II 48/3000 is no exception.

Authorized Victron DealerWarranty claims handled directly through us — no ticket queues, no runaround.
30-Day Performance GuaranteeIf it doesn't perform as specified, we make it right. Uninstalled returns accepted within 30 days.
Free ShippingShips free to your door — no minimums, no surprise freight charges.
★★★★★
“Replaced a modified sine wave inverter that kept tripping my well pump. The MultiPlus-II took over seamlessly during the last outage — my fridge and lights didn't even flicker. PowerAssist is the real deal; I can run my 5500W generator at low load and the inverter fills the gap when the pump kicks on. Paired it with a Victron MPPT and 48V LiFePO4 bank. System is clean, quiet, and I finally trust my backup power.”
F
First L.Prescott, AZ

The MultiPlus-II has all the features of the MultiPlus, plus an external current transformer option to implement PowerControl and PowerAssist and to optimize self-consumption with external current sensing. It also features built-in anti-islanding and an increasingly long list of country approvals.

Features
Unique PowerAssist – Prevents overload of a limited AC source.
First, battery charging automatically reduces.
Second, shore side supply will be boosted with power taken from the battery.
Energy Storage System
Combine with MPPT Solar Chargers or Grid-tie PV Inverters.
UPS Function
Automatically takes over in the event of a grid failure in less than 20milliseconds.
Remote Monitoring and Control
Access can be from a phone, tablet, laptop, or PC for multiple operating systems.

Victron | MultiPlus-II 48/3000 | 48V Input | 3000VA Output 120V | 35A Charger | Transfer Switch Specifications

Freight Shipping

For in stock products, standard processing times are 2 – 5 business days. Estimated delivery times are based on carrier availability and national shipping lanes, these can vary anywhere between 3 – 15 business days.

Parcel Shipping

Estimated shipping times on single item, in-stock orders are 2 – 4 business days depending on position in the order queue. Actual delivery dates vary based on carrier.

Victron | MultiPlus-II 48/3000 | 48V Input | 3000VA Output 120V | 35A Charger | Transfer Switch Manual

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Frequently Asked Questions

The MultiPlus-II 48/3000 is designed for 48V battery systems, which aligns with the standard configuration for LiFePO4 banks in off-grid and backup applications. As an authorized Victron dealer, Off Grid Vault provides a free system design consultation to verify exact compatibility between this inverter, your battery BMS communication protocol, and your charge controller. Do not guess at voltage matching or BMS integration — let our engineers confirm your setup before you purchase.
Consider what a grid failure costs: spoiled food, a flooded basement from a dead sump pump, no heat in winter. The MultiPlus-II eliminates that exposure with sub-20ms transfer and PowerAssist capability that generic inverters do not offer. At $877, this unit delivers 3000VA continuous output, a 35A charger, and transfer switch functionality in a single off-grid proven enclosure. That replaces three separate components and the wiring complexity between them. Finance with Affirm and pay as low as $73/month.
Off Grid Vault is an authorized Victron Energy dealer. Every unit ships with full manufacturer warranty coverage, and warranty claims are handled through us — not through a ticket queue with no accountability. Victron is one of the most respected names in off-grid power, and their equipment carries a track record that speaks for itself. We do not sell gray-market or reconditioned units. What you receive is a new, warranted product backed by a dealer that understands off-grid systems.
Yes. The MultiPlus-II is designed to integrate with Victron MPPT solar chargers or grid-tie PV inverters as part of a full energy storage system. The inverter/charger handles battery management and AC output while your solar charge controller manages panel input. Off Grid Vault offers free system design consultation to spec the exact MPPT controller, panel array, and battery bank size for your daily kWh consumption. Tell us your load profile and we build the architecture around this inverter.
Off Grid Vault offers a 30-day performance guarantee. If the unit does not perform as specified and you have not installed it, return it in original packaging for a full refund. For installed systems, warranty claims are processed directly through us as an authorized Victron dealer. We stand behind what we sell because we only carry equipment we would install on our own cabins. Free shipping is included on all orders.
The MultiPlus-II delivers 3000VA continuous output at 120V. Whether it can run your well pump and refrigerator simultaneously depends on their combined running and surge wattage. A typical refrigerator draws 200–400W running, and a well pump may draw 800–1500W running with higher surge. PowerAssist can supplement with battery power to handle surge demands. For a precise answer, use our free system design consultation — provide your appliance list and we will confirm whether this unit or a higher-capacity model fits your load profile.
SKU: 1593017 Categories: , Brand:

The Off Grid Vault Promise

Every product we carry is vetted for real-world performance. The MultiPlus-II 48/3000 is no exception.

Authorized Victron Dealer Warranty claims handled directly through us — no ticket queues, no runaround.
30-Day Performance Guarantee If it doesn't perform as specified, we make it right. Uninstalled returns accepted within 30 days.
Free Shipping Ships free to your door — no minimums, no surprise freight charges.

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About victron MultiPlus

victron is a trusted manufacturer of premium multiplus. OffGridVault is an authorized dealer offering the full victron lineup with free delivery, price match guarantee, and expert support.

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