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Fronius Primo 3.8 kW Single Phase Grid-Tied Inverter 208/240VAC – 4210064800

Fronius Primo 3.8 kW Single Phase Inverter

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SKU PES-SPS-SIV-0869

Fronius Primo 3.8 kW Single Phase Grid-Tied Inverter 208/240VAC – 4210064800

$2,037.08 USD

$ $2,037.08 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.

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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 3.8 kW Single Phase Grid-Tied Inverter 208/240VAC

The Fronius Primo 3.8 kW inverter delivers premium performance to homeowners who want reliable and efficient solar energy conversion. This single-phase grid-tied inverter is engineered by Fronius, a trusted industry leader with more than 75 years of manufacturing expertise. It converts DC power from your solar panels into clean, usable AC electricity for your home.

Designed specifically for residential applications, the Fronius Primo features a wide 208/240VAC voltage range. This broad range supports various grid configurations commonly used across North America. Its SnapINverter mounting system provides an innovative and tool-free installation experience, reducing both labor costs and setup time effectively.

In addition to its advanced hardware, it integrates a datalogger and built-in WiFi connectivity. This combination enables real-time system monitoring via the Fronius Solar.web platform. You gain full access to your energy production data and system performance anytime and anywhere with ease.

One of the key benefits of this inverter is its SuperFlex Design. It maximizes energy harvest by supporting two independent Maximum Power Point Trackers (MPPT). This feature ensures optimal performance even if your solar panels face different directions or are partially shaded at times.

Key Features & Benefits of the Fronius Primo

This inverter is loaded with features to deliver exceptional value to homeowners. It helps you get the most from your solar array while ensuring long-term reliable operation. Each element of its design is focused on enhancing performance and ease of use.

High-Efficiency Energy Conversion

This inverter achieves up to 96.5% peak efficiency, which maximizes the energy harvested from your solar system. It minimizes conversion losses, helping to lower your electricity bills and reduce your carbon footprint. Fronius Primo stands out for its energy-saving capabilities.

Dual MPPT Technology

With two independent MPPT trackers, this inverter adapts effectively to varying roof angles and shading conditions. The technology optimizes power output in complex residential solar setups. Even if parts of your system face shade, overall energy production remains strong and steady.

Smart Monitoring Included

It includes built-in WiFi connectivity for convenient system monitoring. The free Fronius Solar.web portal allows 24/7 access to system alerts, production data, and historical performance analytics. You can easily track your solar energy flow from any smart device.

SnapINverter Mounting System

The SnapINverter mounting system presents an innovative quick-mount design. It separates the wiring compartment from the power stage. This feature streamlines installation and simplifies maintenance since power stage removal does not require cable disconnection.

Quiet and Durable Operation

This inverter uses fanless convection cooling technology, which results in quiet operation. Its IP65-rated enclosure ensures superior protection from dust, water, and other environmental factors. This design flexibility allows either indoor or outdoor installation based on your needs.

Technical Specifications

MPN	4210064800
Manufacturer	Fronius
AC Power Output	3.8 kW
AC Voltage Range	208/240VAC
Inverter Type	Single-Phase Grid-Tied
Number of MPP Trackers	2
Max DC Input Voltage	600V
Peak Efficiency	96.5%
CEC Weighted Efficiency	95.5%
Dimensions (H x W x D)	14.6 x 11.8 x 5.9 in
Weight	29.8 lbs
Enclosure Rating	NEMA 4X / IP65
Cooling	Convection (Fanless)
Monitoring	WiFi, Ethernet, Fronius Solar.web
Warranty	10 Years (Extendable)
Certifications	UL 1741, IEEE 1547, FCC Part 15

It's compact and lightweight aluminum enclosure provides exceptional power density. This durable design ensures the inverter withstands harsh outdoor conditions for many years. It is built to last, delivering reliable performance through various weather challenges.

Backed by a 10-year standard warranty, extendable to 15 or 20 years, the Fronius Primo 3.8 kW inverter represents a smart investment for your home’s energy future. Its combination of reliability and robust design offers homeowners peace of mind alongside ongoing energy savings.

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 3.8 kW Single Phase Grid-Tied Inverter 208/240VAC

Key Features & Benefits of the Fronius Primo

High-Efficiency Energy Conversion

Dual MPPT Technology

Smart Monitoring Included

SnapINverter Mounting System

Quiet and Durable Operation

Technical Specifications

MPN	4210064800
Manufacturer	Fronius
AC Power Output	3.8 kW
AC Voltage Range	208/240VAC
Inverter Type	Single-Phase Grid-Tied
Number of MPP Trackers	2
Max DC Input Voltage	600V
Peak Efficiency	96.5%
CEC Weighted Efficiency	95.5%
Dimensions (H x W x D)	14.6 x 11.8 x 5.9 in
Weight	29.8 lbs
Enclosure Rating	NEMA 4X / IP65
Cooling	Convection (Fanless)
Monitoring	WiFi, Ethernet, Fronius Solar.web
Warranty	10 Years (Extendable)
Certifications	UL 1741, IEEE 1547, FCC Part 15

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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!

Coll A

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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