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Fronius Symo 12 kW String Inverter 12.0-3 208-240 - A1 SolarStore

Fronius Symo 12 kW Grid-tie Inverter 12.0-3 208-240

Fronius Symo 12 kW Grid-tie Inverter 12.0-3 208-240

$4,172^.67

Strong buyer interest

(34 ratings)

SpecificationCompareSee all
TypeGrid-tie
PhasesThree-phase
AC Output Voltage208/240 VAC
Max DC Voltage (Voc)600 VDC
Attachments
Return policy
Datasheet

Customer reviews & Questions

Verified buyer reviews

Reviews (34)
Questions (3)

Adrian B.

02/22/2025

Fronius Symo 10 kW Grid-tie Inverter 10.0-3 208-240

I can check my system right from my phone awesome monitoring app

Louis

09/30/2024

Fronius Primo 3.8kW Inverter FRO-P-3.8-1-208-240

Great service from A1 SolarStore. Unfortunately, the inverter was defective out of the box. Hardware error 407. Fronius tech support is very good. Awaiting the replacement.

Terry2

10/01/2021

Fronius Primo 3.8kW Inverter 3.8-1

The inverter itself is great, but it’s suitable only for very small installations. Well, a 5kW one actually is fine. Too bad it’s grid -tie, i wanted to use it for my van(

Clarus

09/17/2021

Fronius Primo 3.8kW Inverter 3.8-1

man, i love the production. feels like 2 mppts do make a difference. really nothing to complain about here, great inverter, very happy with it.

Mark R

08/11/2021

Fronius Primo 10kW Inverter FRO-P-10.0-1-208-240

I bought Fronius Primo 10kW for a system consisting of 27 modules 370W each. So far so good. A1 Solar had the lowest price, but their standards were up to the expectations. Can recommend both the inverter and the store

Jordan

08/10/2021

Fronius Symo 10 kw Inverter 10.0-3 208240L Advanced

I’ve seen a few inverters fail not long after the warranty’s end. For this model you can extend the warranty up to 20 years with a few clicks on the Fronius website, which is exactly what I’ve been looking for

Steven C.

08/04/2021

Fronius Primo 10kW Inverter FRO-P-10.0-1-208-240

Great 10 year warranty that shows the confidence of the manufacturer in its product. It was a pleasure to work with you, thanks a lot

Milo

08/02/2021

Fronius Primo 12.5 kW Inverter

Great inverter, but software could be better. Spent many hours trying to set up the app to get it working only to have it go offline. Not very intuitive setup. Works 70% of the time and then just goes offline. Then all of a sudden it will connect again.

Jenny and Greg

07/27/2021

Fronius Primo 12.5 kW Inverter

We have this wonderful piece of hardware hooked up to our 10 kW Solar system. Solid, responsive, easy to connect and monitor, what else to say. Happy with the purchase.

K. Watts

07/19/2021

Fronius Symo 10 kw Inverter 10.0-3 208240L Advanced

It replaced a 15 year old inverter also made by Fronius. I noticed that it is much quieter. I also did all the installation myself, so it is a pretty straightforward process. Didn’t have to wait long for delivery and liked the store’s very informative blog

Dave S.

07/12/2021

Fronius Primo 12.5 kW Inverter

Upgraded our old 6.6kw setup to a 12.5kw solar system with a Fronius primo inverter. So far, so good. I love being able to monitor the stats in realtime through the app.

Skyler Barns

06/15/2021

Fronius Symo 10 kw Inverter 10.0-3 208240L Advanced

It’s a very reliable and functional inverter, I say that after working with Symos for years.

Joe Traveler

06/02/2021

Fronius Primo 10kW Inverter FRO-P-10.0-1-208-240

It is a nice solidly built unit with lots of advanced features. Hope it functions well for long

Nine

04/21/2021

Fronius Primo 3.8kW Inverter 3.8-1

Nice and small. Love the design. The service was good too!

Ben

11/25/2020

Fronius Primo 7.6kW Inverter FRO-P-7.6-1-208-240

These guys conduct business exactly the way it’s supposed to be done. We did it a fair bit of research on different outfits in Central Texas, and met with several folks. What stood out about this company was the no-pressure approach, transparent pricing, communication, and all around professionalism

Joe

11/21/2020

Fronius Primo 3.8kW Inverter FRO-P-3.8-1-208-240

FANTASTIC customer service! I originally called another solar installation company, and after having them NEVER return my phone calls, I decided to give A1 solar a call. I’m SO glad I did! Everyone is extremely knowledgeable and helpful.

Ken

11/06/2020

Fronius Primo 8.2kW Inverter FRO-P-8.2-1-208-240

A1 solar is a very professional and knowledgeable organization. Their staff is very knowledgeable, experienced, and thorough. We would definitely use them again.

Patric

11/01/2020

Fronius Primo 7.6kW Inverter FRO-P-7.6-1-208-240

Very professional, great help finding the right product for building.

Joe

10/19/2020

Fronius Primo 15kW Inverter FRO-P-15.0-1-208-240

We had a really great experience with this service. I’d recommend them to anyone who’s thinking about solar.

Joseph

10/17/2020

Fronius Primo 6kW Inverter FRO-P-6.0-1-208-240

I had an extremely pleasant experience with you guys. Simple, responsive, informative, and brilliantly executed. Highly recommended if you are shopping for solar. Thank you.

John

10/09/2020

Fronius Symo 12 kW Grid-tie Inverter 12.0-3 208-240

Professional, reliable and responsive. Highly Recommended!

Matt

10/09/2020

Fronius Symo 15 kW Grid-tie Inverter 15.0-3 208

I appreciated the very quick responses to all questions and concerns even in the evenings and on weekends.

Matthew

09/28/2020

Fronius Primo 5kW Inverter FRO-P-5.0-1-208-240

We have been pleased with A1 solar and our system which is providing power for our business.

Christian

08/26/2020

Fronius Primo 5kW Inverter FRO-P-5.0-1-208-240

Great service and communication! Honest salespeople, good value.

Kenny

08/06/2020

Fronius Primo 15kW Inverter FRO-P-15.0-1-208-240

I was very pleased with my purchase. The information provided by a salesman was instrumental in my decision with which inverter to use. It saved me a lot of time and hassle having to deal with different sales people. They were friendly and knowledgeable and took the time to explain what inverter will be good for my needs.

Aaron

08/03/2020

Fronius Symo 24kW Inverter FRO-SA-24.0-3-480L Advanced

Had a great experience for a first time solar person. They answered all my questions in a timely manner. Thank you.

Nicholas

07/28/2020

Fronius Primo 8.2kW Inverter FRO-P-8.2-1-208-240

Very professional group of folks. Everyone was helpful. Thanks so much. I’m a month in and already ahead of my daily usage!

Jan

07/22/2020

Fronius Symo 24kW Inverter FRO-SA-24.0-3-480L Advanced

Really attentive and knowledgeable crew, and support staff. Excellent communicators; great ethics and transparency with the customer.

James

07/09/2020

Fronius Primo 3.8kW Inverter FRO-P-3.8-1-208-240

Not knowing much about inverter myself, they explained everything I had questions about. I feel confident that they set me up with a good system.

Peter

06/29/2020

Fronius Symo 12 kW Grid-tie Inverter 12.0-3 208-240

We bought a system couple of months ago. It’s currently providing about half of our monthly demand. Our system is somewhat limited by lack of roof space and the orientation of our property but I feel like are getting as much as possible out of it .

Gregory

06/29/2020

Fronius Primo 6kW Inverter FRO-P-6.0-1-208-240

The company was professional and courteous. We enjoyed working with them.

Don

03/24/2020

Fronius Symo 15 kW Grid-tie Inverter 15.0-3 208

Excellent customer service Our electric bills are down to the basic service charge of around $11 per month.

John

10/09/2020

Professional, reliable and responsive. Highly Recommended!

Peter

06/29/2020

Tyler Chapman

09/03/2021

Do I need to buy the datamanager card to get WiFi on this inverter?

A1 SolarStore

Yes, WiFi is available with the Fronius datamanager 2.0 card.

Aaren Walker

08/16/2021

How does it deal with overheating?

A1 SolarStore

This Fronius Symo Inverter deals with the issue in two primary ways: output power derating and active cooling.

ImpPlant

08/04/2021

I have 15 kw of panels installed, will this unit be enough?

A1 SolarStore

Recommended PV power for this model is 9.5 to 15.5 kWp, so yours should be alright.

Specification

String inverter	String inverter
Type	Grid-tie
Phases	Three-phase
AC Output Voltage	208/240 VAC
Max DC Voltage (Voc)	600 VDC
Features	Communication Module Fan Cooling Indoor Inverter Outdoor Inverter Rapid Shutdown
Dimensions LxWxH	20.1 x 8.9 x 28.5 in
Weight	91.9 lbs
Manufacturer	Fronius USA LLC
Manufacturer Part #	12.0-3/208-240
Operating Temperatures	–40°F to 140°F

More Fronius USA LLC products

3 products

Fronius Symo 10 kW Grid-tie Inverter 10.0-3 208-240

Pickup on Wed, Dec 3 from Pompano Beach, FL

Delivery on Dec 08–11

Fronius Symo 15 kW Grid-tie Inverter 15.0-3 208

Delivery on Dec 08–11

About product

The Fronius Symo 12.0-3 208–240 String Inverter is a reliable and high-performance three-phase inverter designed for commercial and light-industrial PV applications. Combining advanced communication technology, superior efficiency, and robust design, it delivers consistent power conversion and maximum system uptime. With integrated SunSpec rapid shutdown capability and versatile installation options, this inverter is built to meet modern grid and safety standards.

12 kW three-phase string inverter for commercial and industrial PV systems
Dual MPP trackers for flexible string design and optimized energy harvest
Integrated SunSpec PLC transmitter for rapid shutdown compliance with NEC 2017
Transformerless design with 97% maximum efficiency and 96.5% CEC efficiency
Advanced AFCI and ground fault protection for enhanced safety and reliability
Smart Grid Ready with advanced grid support functions (Volt-Var, Volt-Watt, Frequency-Watt)
Integrated Wi-Fi, Ethernet, and RS422 communication for system monitoring via Fronius Solar.web
NEMA 4X rated enclosure for indoor and outdoor installation

Streamlined installation with SnapINverter technology

The Fronius Symo 12.0-3 208–240 features the innovative SnapINverter mounting system, designed for quick and tool-free installation. The lightweight design and zero-tilt mounting capability simplify both setup and maintenance, making it ideal for rooftop and ground-mounted commercial systems.

Safety and compliance built-in

This inverter comes equipped with integrated DC disconnects, arc-fault protection (AFCI), and SunSpec rapid shutdown signaling to meet NEC 2017 safety requirements. Ground fault protection with isolation monitoring and temperature-based power derating ensure reliable and safe operation in all environments.

Smart communication and monitoring

With the optional Fronius Datamanager 2.0 card, the Symo enables advanced monitoring and communication. It supports Wi-Fi, Ethernet, Modbus TCP, and JSON protocols, allowing seamless integration into energy management systems and remote performance tracking via Fronius Solar.web.

High efficiency and robust design

Delivering up to 97% peak efficiency and 96.5% CEC-rated efficiency at both 208 V and 240 V, the Symo 12.0-3 ensures optimal energy conversion. Its variable-speed cooling system, transformerless topology, and durable NEMA 4X enclosure guarantee high reliability and long service life even under challenging environmental conditions.