Is the Fronius Primo 12.5-1 suitable for residential installations?

Yes, this inverter is ideal for large residential systems and small commercial projects. Its single-phase 208/240V output, compact design, and quiet operation make it well-suited for home installations.

How efficient is the Fronius Primo 12.5-1 inverter?

The inverter offers a maximum efficiency of up to 98.1% thanks to its transformerless design, ensuring minimal energy loss and high solar yield even in challenging conditions.

Does the Fronius Primo 12.5-1 support multiple MPPTs?

Yes, it features two independent MPPTs, allowing flexible system design and optimized performance when panels are installed on different roof orientations or under partial shading.

Is the Fronius Primo 12.5-1 grid-ready?

The inverter is fully smart-grid ready and supports reactive power control and dynamic grid management, making it compliant with modern U.S. utility grid requirements.

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Fronius Primo 12.5-1 208-240VAC 4210077800

Fronius Primo 12.5-1 208/240V String Inverter

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Lifetime Customer Support

Unlimited lifetime support, always available.

In Stock

SKU PES-SPS-SIV-0746

Fronius Primo 12.5-1 208-240VAC 4210077800

$4,633.90 USD

$ $4,633.90 USD

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In Stock

Get yours today!

9+ sold

In the last 7 days

Flat Rate Shipping - Calculated at Checkout

Delivery timeframe shown above at checkout

Lifetime Customer Support

Unlimited lifetime support, always available.

In High Demand! Order Now To Secure Your Items

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Specifications

Datasheet

Power 6.0 kW

Output Voltage 208/240 VAC

Max Dc Power 9000 W

Input Voltage 200-480 V

Mpp Voltage Range 200-480 V

Dc Voltage Range 80-1000 V

Nominal Ac Power 6000 W

Max Output Power 6000 W

Nominal Output Current 25.0 A

Max Efficiency 98.1%

Mppt Count 2

Protection Class NEMA 4X (IP65)

Max Input Current 25/12.5 A (per MPPT)

What is your return policy?

Returns are free in the first 30 days with no restocking or processing fees, although the customer may be responsible for paying return shipping. See our complete return policy on our Shipping, Delivery, and Returns page linked in the footer of this website.

What’s covered by your return policy?

Our returns policy covers all purchases made through Portlandia Electric Supply. For warranty issues, as authorized distributors, we honor the full manufacturer warranty of ALL the brands on our website. See our complete returns and warranty policies on our Shipping, Deliver, and Returns page.

How long will it take to receive my order?

All orders are processed within 72 hours and you can expect delivery on most orders within 5-7 business days. You will receive access to our customer portal after ordering, where it is easy to track all your shipments. See our Shipping, Delivery and Returns page for more details.

What are your financing and payment options?

We offer several ways to pay to make getting your solar kit simple:

Credit Card: if the purchase is greater than your card’s limit, you can split the cost onto multiple cards as well as Paypal, financing through Affirm, and ACH/bank transfer

You can arrange financing during the checkout process, or scroll further down this page for more details. Please note, if you'd like to finance your order, you can do so instantly, right at checkout.

How does your Lifetime Customer Support work?

Our legendary lifetime customer support has helped make us the #1 online solar retailer! We have a dedicated team of solar professionals standing by to help you navigate the world of solar with ease. From selecting the perfect solar kit to installation and beyond, we provide support and expertise at every step of the journey.If you need help with ordering, shipping, troubleshooting, expanding your system, warranty issues, or anything else you have questions about for as long as you own your Portlandia Electric Supply equipment, we’ve got you covered: we’re always only a phone call or email away.

Fronius Primo 12.5-1 208/240V String Inverter — Reliable Single-Phase Solar Power Solution

The Fronius Primo 12.5-1 208/240V String Inverter is a high-efficiency solar inverter engineered for residential and small commercial PV systems. Designed with cutting-edge power electronics and smart communication features, the Fronius Primo 12.5-1 208/240V String Inverter delivers unmatched performance, reliability, and safety. It provides flexible design options for a range of solar applications, ensuring optimal energy production and long-term operation. The Fronius Primo 12.5-1 208/240V String Inverter combines Austrian precision engineering with advanced monitoring capabilities to meet modern grid standards.

Product Features

High Conversion Efficiency

Achieves up to 98.1 % efficiency with transformerless design, reducing power loss and maximising yield even in partial shading conditions.

Smart Grid Ready

Equipped with dynamic grid support and reactive power management, enabling smooth integration with evolving grid regulations.

Integrated Data Communication

Built-in Wi-Fi, Ethernet, and Modbus interfaces enable real-time system monitoring through Fronius Solar.web and third-party platforms.

SnapINverter Technology

Innovative hinged mounting design simplifies installation, maintenance, and servicing, reducing downtime and labour costs.

Quiet, Compact Design

The Fronius Primo 12.5-1 208/240V String Inverter features fan-assisted active cooling for consistent performance in variable climates while maintaining low noise levels.

How It Works

The Fronius Primo 12.5-1 208/240V String Inverter converts DC electricity from solar panels into AC power suitable for home or business use. Integrated maximum power point tracking (MPPT) technology ensures optimal performance by adjusting voltage and current in real time to extract the maximum available solar energy.

Specifications

Model	Primo 12.5-1
MPN	4210077800
Rated AC Power Output	12.5 kW
AC Voltage	208/240 V AC, Single Phase
DC Input Voltage Range	270 – 800 V DC
Maximum DC Input Voltage	1000 V DC
Number of MPPTs	2
Maximum Efficiency	98.1 %
Enclosure Rating	NEMA 4X / IP65 (Outdoor Rated)
Cooling System	Fan-Assisted Active Cooling
Communication Interfaces	Ethernet / Wi-Fi / Modbus RTU / RS485
Dimensions (L × W × H)	28 × 17 × 8 in (711 × 432 × 203 mm)
Weight	≈ 47.3 lb (21.5 kg)
Operating Temperature Range	-13 °F to 140 °F (-25 °C to +60 °C)
Warranty	10 Years (Extendable)
Manufacturer	Fronius

Specifications verified from Fronius official datasheet (Primo 3.8–15.0-1 Data Sheet, 2023) and installation manuals.

What is your return policy?

What’s covered by your return policy?

How long will it take to receive my order?

What are your financing and payment options?

We offer several ways to pay to make getting your solar kit simple:

Credit Card: if the purchase is greater than your card’s limit, you can split the cost onto multiple cards as well as Paypal, financing through Affirm, and ACH/bank transfer

You can arrange financing during the checkout process, or scroll further down this page for more details. Please note, if you'd like to finance your order, you can do so instantly, right at checkout.

How does your Lifetime Customer Support work?

Fronius Primo 12.5-1 208/240V String Inverter — Reliable Single-Phase Solar Power Solution

Product Features

High Conversion Efficiency

Achieves up to 98.1 % efficiency with transformerless design, reducing power loss and maximising yield even in partial shading conditions.

Smart Grid Ready

Equipped with dynamic grid support and reactive power management, enabling smooth integration with evolving grid regulations.

Integrated Data Communication

Built-in Wi-Fi, Ethernet, and Modbus interfaces enable real-time system monitoring through Fronius Solar.web and third-party platforms.

SnapINverter Technology

Innovative hinged mounting design simplifies installation, maintenance, and servicing, reducing downtime and labour costs.

Quiet, Compact Design

The Fronius Primo 12.5-1 208/240V String Inverter features fan-assisted active cooling for consistent performance in variable climates while maintaining low noise levels.

How It Works

Specifications

Model	Primo 12.5-1
MPN	4210077800
Rated AC Power Output	12.5 kW
AC Voltage	208/240 V AC, Single Phase
DC Input Voltage Range	270 – 800 V DC
Maximum DC Input Voltage	1000 V DC
Number of MPPTs	2
Maximum Efficiency	98.1 %
Enclosure Rating	NEMA 4X / IP65 (Outdoor Rated)
Cooling System	Fan-Assisted Active Cooling
Communication Interfaces	Ethernet / Wi-Fi / Modbus RTU / RS485
Dimensions (L × W × H)	28 × 17 × 8 in (711 × 432 × 203 mm)
Weight	≈ 47.3 lb (21.5 kg)
Operating Temperature Range	-13 °F to 140 °F (-25 °C to +60 °C)
Warranty	10 Years (Extendable)
Manufacturer	Fronius

Specifications verified from Fronius official datasheet (Primo 3.8–15.0-1 Data Sheet, 2023) and installation manuals.

FAQs

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Customer Success Stories

Troy P

EG4 off-grid base kit, Happy with my purchase.

This is the first stage of my three planned purches. I got the eg4 inverter 6000 XP base kit with six 400 watt panels and the two server rack batteries. Did a little online research and followed the instructions and it got set up without any issues. Right now I'm just running it in my garage on a single outlet and have been running dual 750 watt water distillers with it. Once I get the second inverter and a bunch more panels and batteries, I plan on attaching it to my subpanel in my house that has my lights and outlets and appliances on it. Then I'll get a soft start for my AC and blower and run it on my main panel.

Jacob B

Easy Process, Genuine Support

Trying to pick the correct solar system for your needs can be very technical and frustrating. I wanted to thank Yvhan and the Portlandia Electric supply team for their patience and helpful attitudes through multiple calls. I feel like we were able to narrow it down to what worked for me and my family. My system works great and I couldn't be happier to have picked Portlandia Electric Supply.

Patrick B

Off Grid Solar Purchase

I wanted to get an offgrid solar system for years but didn’t know where to start. I found Portlandia Electric Supply on Facebook and decided to submit a quote. Within 24 hours I had a custom proposal that was almost half the price of the companies I had previously got quotes from. My wife and I decided to order online and the kit came in a timely manner and it was an easy install. Great company to work with!

James Martin

Highly Recommend

I would like to take the time to express the outstanding service that I was provided with by Portlandia Electric Supply. They provided me with all the answers to my questions, and after reviewing our quote over the phone I felt comfortable proceeding to order my kit. It’s exactly what I needed and they were there to help us over the phone when we had questions installing it. I highly recommend others in need to choose Portlandia Electric Supply.

Brian H

Solar Kit for Mobile Work Van

As a professional videographer, I needed reliable power on the go.Portlandia Electric Supply Delta Pro and roof-mounted panels were the perfect solution. Setup was easy, and the kit included everything needed. The Delta Pro powers my cameras, lights, laptop, and a small fridge with impressive battery capacity.

Keith S

Best Tech Support

You folks have been wonderful guiding me through the ins and outs of going solar. Plus your tech guys Rod and Nelson are the absolute best. They explained all the different aspects of inverters, batteries and how to keep them in top condition. Too much more to put here… but no other company has the 100% tech support you provide for your customers!

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Great Experience

My experience with Portlandia Electric Supply has been excellent. Before the sales, they answered all my questions to assure that I got what I needed. After the sales they continued to support me with answers and help. I had a warranty issue with a unit, and it was handled as well as possible. I would recommend them to anyone looking to go solar.

Troy P

EG4 off-grid base kit, Happy with my purchase.

Jacob B

Easy Process, Genuine Support

Patrick B

Off Grid Solar Purchase

James Martin

Highly Recommend

Brian H

Solar Kit for Mobile Work Van

Keith S

Best Tech Support

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