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victron|SKU:1593017

Victron MultiPlus-II 48/3000: 48V Inverter/Charger with Sub-20ms Transfer

Reliable 48V Inverter/Charger with Seamless Transfer Switching

Sub-20ms transfer — Seamless UPS switchover when grid fails
PowerAssist overload protection — Boosts limited AC with battery power
Remote system monitoring — Phone, tablet, or PC access anywhere
External current sensing — Optimizes self-consumption automatically
  • FREE System Design Consultation -- Our engineers size your system for your actual consumption
  • FREE Shipping -- Ships free, including LTL freight on large orders
  • Compatibility Guarantee -- Pre-vetted to work within your 48V architecture

$877.95

Out of stock

In the box

  • Victron MultiPlus-II 48/3000 inverter/charger unit
  • Product documentation
Victron | MultiPlus-II 48/3000 | 48V Input | 3000VA Output 120V | 35A Charger | Transfer Switch
Victron MultiPlus-II 48/3000: 48V Inverter/Charger with Sub-20ms Transfer
$877.95

Reliable 48V Inverter/Charger with Seamless Transfer Switching

The MultiPlus-II 48/3000 is an off-grid proven inverter/charger built for systems that demand reliable 48V power conversion with seamless transfer switching. Its PowerAssist feature automatically reduces charging and supplements shore power from your battery bank to prevent AC source overload — critical when running on limited generator or grid power. With built-in anti-islanding and sub-20ms UPS transfer, this unit keeps your grid-independent system online through outages without interruption. Pair with MPPT solar chargers for a fully self-reliant energy system.

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 Ready
3000VA
Continuous Output
35A
Battery Charger
48V
DC Input Voltage
No More Blackout Vulnerability

No More Blackout Vulnerability

The grid-tied system your neighbor bought goes dark the moment the utility fails. That defeats the entire point of energy independence. The MultiPlus-II eliminates that vulnerability with sub-20ms automatic transfer switching — your lights, fridge, and well pump never see the outage. At Off Grid Vault, every component we carry is pre-vetted to work together. We spec systems we would install on our own cabins, so your inverter talks to your battery BMS, your charge controller handles the correct voltage, and your breakers are rated for the actual current. No mix-and-match guesswork.

PowerAssist Handles Peak Loads Without Tripping Breakers

PowerAssist Handles Peak Loads Without Tripping Breakers

When your well pump and refrigerator surge simultaneously, a standard inverter trips or shuts down. The MultiPlus-II PowerAssist feature prevents that by first reducing battery charge current, then boosting the shore or generator supply with battery power. Your 3000VA continuous output stays stable under real-world peak loads. Combine this unit with MPPT solar chargers or grid-tie PV inverters to build a self-reliant energy storage system sized for your actual daily consumption — not a datasheet ideal.

Monitor Your System From Any Device

Monitor Your System From Any Device

Remote monitoring and control lets you check your MultiPlus-II from a phone, tablet, laptop, or PC across multiple operating systems. You see real-time state of charge, input/output wattage, and charge status without walking outside. Built-in anti-islanding protection and an extensive list of country approvals mean this unit meets the compliance standards installers and inspectors require. As an authorized Victron dealer, Off Grid Vault handles warranty claims directly — no ticket queue, no finger-pointing between vendors.

System Compatibility

Verify these conditions before adding the MultiPlus-II to your build.

  • 48V DC battery bank installed or planned
  • 120V AC load requirements within 3000VA continuous
  • Compatible with MPPT solar chargers or grid-tie PV inverters

Where This Unit Performs

Built for real-world off-grid and backup power scenarios.

Cabin & Homestead Power Systems
Solar Energy Storage Integration
Emergency Backup with Instant UPS Cutover

Full specifications

At a glance

Dimensions
See product page
Warranty
See product page
Full specifications11 data points across 4 categories

Dimensions

WeightSee product page
DimensionsSee product page

Power & Performance

DC Input48V
AC Output3000VA / 120V
Battery Charger35A
Transfer TimeLess than 20ms
Transfer SwitchYes

Materials

ConstructionSee product page

Compliance & Warranty

Anti-IslandingBuilt-in
ApprovalsSee product page
WarrantySee product page

The Off Grid Vault Promise

Every product we carry is vetted for real-world performance and backed by people who actually understand off-grid power.

30-Day Performance GuaranteeIf it doesn't perform as specified, we make it right — uninstalled returns accepted within 30 days in original packaging.
Free ShippingShips free on all orders, including LTL freight on large systems. No minimums, no surprise charges.
Authorized Victron DealerWarranty claims handled directly through us. Full manufacturer backing with real human support after the offer.
★★★★★
“Replaced a failed inverter I bought off a generic marketplace with this MultiPlus-II. The sub-20ms transfer is real — my fridge never cycled off during the last outage. PowerAssist handled the well pump surge without tripping. Off Grid Vault confirmed my battery compatibility before I ordered. This is the inverter I should have bought first time.”
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

This is a Victron — the brand referenced by every serious off-grid installer and content creator. The 3000VA output, 35A charger, and sub-20ms transfer switching are specs you verify on a datasheet, not marketing copy. Pair it with your 48V LiFePO4 bank and MPPT charger, and you have a grid-independent backbone that runs for years without replacement. One failed inverter from a generic marketplace costs you the entire system downtime and replacement labor.
Off Grid Vault is an authorized Victron dealer. That means warranty claims go through us directly — not through a third-party ticket queue. We also provide a free system design consultation where our engineers size your complete setup around this MultiPlus-II. Every component we recommend is pre-vetted for compatibility with your 48V architecture. You get expert guidance before the purchase and accountability after it ships.
The MultiPlus-II 48/3000 is designed for 48V battery systems and pairs directly with MPPT solar chargers. However, confirming compatibility with your specific battery BMS communication protocol, panel array voltage, and overall system architecture matters. That is exactly why we offer a free system design consultation. Tell us your battery bank capacity, daily kWh consumption, and panel configuration — we will confirm whether this unit fits your build or recommend the correct alternative.
Victron provides a manufacturer warranty on the MultiPlus-II. As an authorized dealer, Off Grid Vault processes warranty claims on your behalf — you deal with us, not a faceless support portal. Our 30-day performance guarantee also covers uninstalled returns in original packaging if the unit does not perform as specified. For installed systems, the manufacturer warranty remains in effect and we facilitate the entire process.
The MultiPlus-II ships free, including LTL freight for large system orders. Installation time depends on your existing setup — if you already have a 48V battery bank and AC distribution panel, a qualified installer can typically integrate this unit within a few hours. If you are building from scratch, contact us for a free system design consultation and we will map out the full component list and integration sequence for your specific application.
That depends on your simultaneous peak load. A 3000VA inverter at 120V supports roughly 2,400W continuous — enough for a refrigerator, well pump, lights, and communications equipment running at the same time. If you need to run a central AC unit, electric water heater, or welder simultaneously, you would need a higher VA rating. Contact us with your load schedule and we will confirm whether this unit matches your requirements or specify the right size.
SKU: 1593017 Categories: , Brand:

The Off Grid Vault Promise

Every product we carry is vetted for real-world performance and backed by people who actually understand off-grid power.

30-Day Performance Guarantee If it doesn't perform as specified, we make it right — uninstalled returns accepted within 30 days in original packaging.
Free Shipping Ships free on all orders, including LTL freight on large systems. No minimums, no surprise charges.
Authorized Victron Dealer Warranty claims handled directly through us. Full manufacturer backing with real human support after the offer.

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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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