Victron Energy MultiPlus-II 12/3000/120-50 120V Inverter Charger

Overview

The Victron Energy MultiPlus-II 12/3000/120-50 120V is a 12V inverter/charger for boats and other mobile power systems that combines a 3000VA inverter, a 120A battery charger, and a 50A transfer switch in one unit. It supports 120VAC, 60Hz output in inverter mode and accepts single-phase 90-140VAC input for charging and pass-through from shore power or a generator.

This model is a strong fit for yachts, cruising boats, fishing boats, and onboard power refits where a 12V house bank needs to run AC loads while also charging from shore or genset power. PowerControl helps manage limited shore or generator input, while PowerAssist can add battery power during short peak-load periods.

The unit has two AC outputs. The main output keeps critical loads supplied when shore or generator power drops away, while the auxiliary output can be used for loads that should only run when AC input is available, such as a water heater. With an IP21 steel enclosure, it belongs in a dry, ventilated electrical space rather than an exposed cockpit, deck locker, or wet bilge area.

Key features

• 3000VA inverter capacity with 2400W continuous output at 25 C for common onboard AC loads.
• 120A battery charger for 12V battery banks, with adaptive charging and battery temperature sensing.
• 50A transfer switch and 50A maximum AC input current for shore power or generator integration.
• PowerControl helps prevent a limited shore power pedestal or generator from being overloaded.
• PowerAssist can supplement shore or generator power from the battery during short demand peaks.
• Two AC outputs allow critical circuits to stay powered while secondary loads disconnect during inverter-only operation.
• VE.Bus communication supports monitoring, system integration, and larger parallel, split-phase, or three-phase systems when configured correctly.
• IP21 steel enclosure with blue RAL 5012 finish for installation in a protected onboard electrical compartment.
• M8 battery terminals and 120VAC screw terminals sized for 13 mm² or 6 AWG conductors.
• Measures 578 x 277 x 148 mm and weighs 29 kg, so mounting location and service access should be planned before installation.

Variants

This product is offered in two certification configurations for the same MultiPlus-II 12/3000/120-50 120V model.

The variant difference is the certification option. The 12V DC format, 3000VA inverter rating, 120A charger rating, 50A transfer capacity, and 120V AC operating format remain the same across these two configurations.

• PMP122305110: Certification Standard. This version uses the standard certification configuration for the MultiPlus-II 12/3000/120-50 120V.
• PMP122305122: Certification UL. This version is the UL configuration for installations where that listing is part of the project or compliance requirement.

Installation and mounting

Install this inverter/charger in a dry area with good ventilation and at least 10 cm of clearance around the unit for cooling. It should be mounted on a solid surface that can support its 29 kg weight, with the battery cable run kept as short as practical to reduce voltage drop.

For marine installations, the casing must be connected to the vessel hull or grounding plate when the shore connection can be disconnected. Direct shore ground practices should be reviewed carefully because galvanic corrosion is a real concern on boats, especially in marinas with mixed shore power systems.

Electrical and system integration

The 12/3000/120-50 model uses a 9.5-17V DC input range and produces 120VAC output in inverter mode. For full output capability, the battery bank, DC fuse, cable size, AC protection, and grounding layout must be matched to the installation and checked by a qualified marine electrical professional.

VE.Bus connectivity allows the unit to work with Victron monitoring and control products such as GX devices, Digital Multi Control, VE.Bus Smart dongle, and MK3-USB for configuration. This matters on boats where the inverter/charger is part of a broader DC and AC system with solar charging, battery monitoring, generator control, or remote supervision.

Use cases on board

This model suits 12V house-bank systems that need dependable AC power for cabin outlets, galley appliances within the inverter rating, electronics, chargers, and other onboard loads while away from shore power. It is also useful for vessels that frequently move between dockside shore power, generator operation, and battery-supported anchoring.

The auxiliary AC output is especially helpful when some loads should not drain the battery bank. A water heater, for example, can be kept on an AC-input-only circuit while navigation, communications, or cabin power remain available through the main output.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Orders of $100 or more qualify for free shipping when eligible. For orders under $100, shipping costs are calculated at checkout based on destination, package weight, and selected service. International shipping is available for eligible products, and certain items may require additional handling, warehouse transfers, or may ship directly from the manufacturer, which can affect processing time.

Deliveries are handled by preferred carriers such as USPS, UPS, FedEx, DHL, and others depending on your location and selected service. Estimated delivery times are displayed at checkout and may vary due to customs processing, carrier delays, weather, postal disruptions, or other circumstances beyond our control. Once your order ships, you'll receive a confirmation email with tracking information. Tracking may take up to 24 hours to update on the carrier's website and is also available through your account when applicable.

We ship throughout the United States and to most international destinations for products eligible for international shipping. International orders may be subject to customs duties, taxes, brokerage charges, or other import fees, which are the customer's responsibility and are not included in the product or shipping price. PO Boxes are accepted only when shipping through USPS, and not all packages qualify for this option. If your order does not arrive within the estimated delivery window, please contact us at info@apollolighting.com or +1 (954) 375-0100 so we can assist with locating your package.

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Returns may be requested within 30 days of receiving your order. Items must be unused, uninstalled, unaltered, and returned in their original packaging with all tags, packing materials, blank warranty cards, manuals, instructions, accessories, and included items. Certain products, including installed or used electronics, electrical components, lighting, consumables, custom or special-order items, cut-to-length products, safety equipment, and merchandise exposed to water or marine conditions, may not be eligible for return.

To request a return, sign in to your account and select the applicable order and items, and submit your request for review. Eligible unfulfilled items may also be submitted for cancellation within 1 hour of placing the order. Returns or cancellations are not considered approved until you receive confirmation from Apollo Lighting. Please do not ship or drop off merchandise before receiving return approval and instructions.

Customers are responsible for arranging and paying for return shipping unless the return is due to an error by Apollo Lighting or the item is verified as defective, damaged, or incorrect. Missing, damaged, defective, or incorrect items must be reported within 2 business days of delivery, and photos or other documentation may be required for review. If the issue is verified, Apollo Lighting may provide or reimburse return shipping and issue a replacement or refund depending on the circumstances. International customers are responsible for return shipping, duties, taxes, customs charges, brokerage fees, and other costs associated with an international return.

After your return is received and inspected, approved refunds are issued to the original payment method and may take 5-7 business days to appear after processing. Original shipping and handling charges are nonrefundable, and the value of any included free items that are not returned may be deducted from the refund. Apollo Lighting does not charge a standard restocking fee on eligible returns. Returns that are incomplete, damaged, installed, used, altered, improperly packaged, or otherwise do not meet the eligibility requirements may be refused. We recommend using a trackable and appropriately insured shipping service for all customer-arranged returns.

For assistance, contact info@apollolighting.com or call +1 (954) 375-0100.

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Many products sold by Apollo Lighting include a manufacturer's warranty covering defects in materials or workmanship. Warranty terms vary by brand, product category, and model, so eligibility, coverage duration, exclusions, and available remedies are determined by the applicable manufacturer. We recommend reviewing the warranty information provided with your product before installation or use, especially for marine electronics, navigation equipment, lighting, electrical systems, pumps, safety equipment, and other specialized marine products.

If you need warranty service, the claim must follow the process established by the manufacturer, authorized service center, or designated warranty provider. You may be asked for proof of purchase, a serial number, product registration, photos, maintenance or installation records, or other documentation. Apollo Lighting does not determine or modify a manufacturer's warranty coverage or final claim decision, but we are happy to help provide purchase information and direct you to the appropriate manufacturer or warranty resource.

Keep your receipt, product documentation, serial number information, and original packaging when practical. Damage caused by normal wear, misuse, improper installation, insufficient maintenance, corrosion, impact, unauthorized modifications, electrical issues, or operation outside the manufacturer's specifications may not be covered. Warranty claims are separate from standard returns, so a product that has been installed, used, or exposed to marine conditions may no longer qualify for return while still remaining eligible for evaluation under the manufacturer's applicable warranty.

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