Victron Energy SIN121251100 Sun Inverter 12/250-15 IEC

Victron Energy Sun Inverter 12/250-15 250VA Sine Wave Inverter and 15A PWM Solar Charger. 12V. Minimum Wiring.

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Product Overview

The Victron Energy Sun Inverter 12/250-15 IEC (SIN121251100) is the 12V variant of Victron's compact all-in-one Sun Inverter combining a 250VA sine wave inverter and a 15A PWM solar charger in a single enclosure for 12V battery systems. It allows standard 230V AC domestic equipment to be powered from a 12V leisure or automotive battery bank, while the integrated solar charger simultaneously keeps that battery charged from a connected solar panel. Everything arrives in one unit, with screw terminal DC and PV connections requiring no specialist tools or cable lugs.

At 12V with a 15A PWM charger, the SIN121251100 is the right fit for smaller 12V installations caravans, campervans, boats, cabins, and mobile work setups where a 12V battery bank is already in place and a compact solar inverter solution is preferred over a separate inverter and solar charger. The Bluetooth VictronConnect app provides full monitoring and configuration wirelessly, a VE.Direct port connects to a Victron GX device or GlobalLink 520 for remote system monitoring via the VRM portal, and ECO mode reduces standby power consumption when loads are absent. An IEC-320 socket provides direct appliance connection, and an IEC-320 male plug is included.

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Key Specifications

• Part Number: SIN121251100
• Product: Sun Inverter 12/250-15 IEC
• Battery Voltage: 12V
• Inverter Output: 250VA — sine wave
• Solar Charger: 15A PWM
• Solar Charge Algorithm: Programmable
• AC Output Socket: IEC-320 (male plug included)
• AC Output Voltage: 210–245V (configurable)
• AC Output Frequency: 50Hz or 60Hz (configurable)
• ECO Mode: Yes — standby below pre-set load (min 15W); checks every 2.5 seconds (adjustable)
• High Start-Up Power: Yes
• Topology: Full bridge + toroidal transformer
• Bluetooth: Yes — VictronConnect app (iOS and Android)
• VE.Direct Port: Yes — GX device, GlobalLink 520, or computer
• Remote On/Off: Yes — VE.Direct Remote panel (sold separately) or 2-pole connector
• LED Diagnosis: Yes
• Dynamic Cut-Off: Yes — load-dependent battery cut-off
• Battery Temperature Compensation: Yes — configurable; or low-temperature cut-off
• Short Circuit Protection: Yes
• Overheating Protection: Yes
• DC Connections: Screw terminals — no special tools
• PV Connections: Screw terminals — no special tools
• Built-In Transfer Switch: No — external Filax ATS required
• Peak/Surge Power: Not specified — confirm with supplier
• PV Input Voltage Range: Not specified — confirm with supplier
• Efficiency: Not specified — confirm with supplier
• Standby Power (ECO Mode): Not specified — confirm with supplier
• Operating Temperature Range: Not specified — confirm with supplier
• IP Rating: Not specified — confirm with supplier
• Dimensions: Not specified — confirm with supplier
• Weight: Not specified — confirm with supplier

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Features & Benefits

• 12V System — Broader Compatibility with Smaller Installations — The 12V battery voltage makes the SIN121251100 the natural choice for the large majority of caravan, motorhome, small boat, and leisure vehicle installations where 12V battery systems are standard. A 15A PWM charger at 12V delivers up to 180W of solar charging — appropriate for one or two 100–200W panels in a compact setup.
• 15A PWM Solar Charger — Higher Current Than the 24V Variant — At 15A versus the 10A charger in the 24V Sun Inverter (SIN241251100), the 12V model provides proportionally greater solar charging capacity relative to its battery system voltage — suited to 12V banks where a higher charge rate from solar is beneficial for faster recovery between use.
• 250VA Sine Wave Output — Pure sine wave 230V AC output suitable for all standard appliances — LED and halogen lamps, small power tools, entertainment equipment, phone and device chargers, and other domestic equipment within the 250VA output rating.
• Combined Unit — Minimum Wiring — One DC connection to the battery, one PV connection to the solar panel, one IEC-320 AC output socket for the load. No separate solar charge controller installation, no additional inter-unit wiring. Designed for installations where simplicity and minimum component count take priority over maximum system flexibility.
• ECO Mode — Reduced Standby Consumption — The inverter shuts down when no load is detected and checks for demand every 2.5 seconds (adjustable). If load exceeds 15W (minimum configurable), the inverter resumes. Reduces no-load standby power consumption significantly — directly beneficial in 12V systems where battery capacity is often limited and standby drain matters.
• Dynamic Cut-Off — Load-Dependent Battery Protection — Adjusts the low battery cut-off voltage threshold based on current load. Under heavy load, a higher cut-off threshold prevents damaging over-discharge driven by high current draw and voltage sag. Under light load, a lower threshold is acceptable. Protects 12V batteries more accurately than a fixed voltage threshold across real-world varying load conditions.
• Bluetooth — VictronConnect App — All inverter and charger parameters readable and configurable wirelessly via the free VictronConnect app. Includes output voltage (210–245V), frequency (50/60Hz), ECO mode, low battery alarm and cut-off levels, dynamic cut-off, charge current, voltages, algorithm, and temperature compensation — all without a wired connection.
• VE.Direct — GX Device and Remote Monitoring — Connect to a Victron GX device (Cerbo GX or equivalent) via VE.Direct for full system monitoring via the free VRM portal. Connect a GlobalLink 520 for lightweight remote monitoring without a full GX device. Direct computer connection for monitoring and configuration is also supported.
• Full Bridge + Toroidal Transformer — Proven, reliable topology delivering high start-up power for inrush-demanding loads, robust short circuit protection, and overheating protection under overload and high ambient temperature conditions.
• IEC-320 Socket — Direct Appliance Connection — Standard IEC-320 output socket for direct connection of appliance cords without hardwiring. IEC-320 male plug included.
• Screw Terminals — No Special Tools — Battery and solar connections via standard screw terminals. No crimping tools, MC4 connectors, or specialist cable lugs required.

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Technical Specs

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Compatible With / Goes Well With

Battery Systems:

• 12V leisure, automotive, and deep-cycle battery banks — lead acid (AGM, gel, flooded)
• Lithium compatibility — confirm via VictronConnect charge algorithm configuration

Solar Panels:

• 12V-compatible PV panels within the PWM charger's input voltage range (confirm from datasheet)
• Maximum 15A solar charge current at 12V nominal

Monitoring and Control (sold separately):

• Victron Cerbo GX or other GX device (via VE.Direct — VRM system monitoring)
• Victron GlobalLink 520 (via VE.Direct — lightweight remote monitoring)
• Phoenix Inverter Control VE.Direct Remote panel (remote on/off)

Automatic Transfer Switch (sold separately):

• Victron Filax Automatic Transfer Switch — for transfer to generator or shore power with less than 20ms switchover time

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Frequently Asked Questions

What is the difference between the 12V and 24V Sun Inverter models?

The primary differences are battery voltage (12V vs 24V) and solar charger current (15A here vs 10A on the 24V model). Both deliver 250VA of inverter output and share the same feature set — Bluetooth, VE.Direct, ECO mode, dynamic cut-off, and programmable charge algorithm. Choose the 12V model for existing 12V battery systems; choose the 24V model for 24V battery systems.

Does this unit include a transfer switch for switching between solar and shore power?

No. The Sun Inverter does not have a built-in automatic transfer switch. The Victron Filax Automatic Transfer Switch is recommended for installations needing transfer between the inverter output and an external generator or shore power source — it provides less than 20ms switchover time.

What solar panels are compatible with the 15A PWM charger?

Any 12V-compatible solar panel — or multi-panel string — within the charger's maximum PV input voltage range (not confirmed in supplier brief; confirm from datasheet) producing up to 15A at 12V nominal. For a single 12V-system panel, most 100–200W panels in a 12V configuration will work. Confirm PV input voltage limits from the datasheet before connecting.

Can I monitor and configure this unit without being physically present?

Yes. Via a connected Victron GX device and the VRM portal, remote monitoring and some control functions are available from anywhere with internet access. For lightweight remote monitoring without a GX device, a GlobalLink 520 connects via VE.Direct. Local Bluetooth access via VictronConnect is available within Bluetooth range.

Is this inverter suitable for sensitive electronics and medical equipment?

The Sun Inverter produces a sine wave output — the correct waveform for sensitive electronics, medical devices, and equipment with active power factor correction. Always confirm total power requirements are within the 250VA output rating and that the specific equipment is suitable for use on a battery-backed inverter supply.