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SMA Solar String Inverter
SMA Solar String Inverter
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SKU  PES-SPS-SIV-0549

SMA Solar Sunny Boy 3.8kW 208/240VAC String Inverter - SB3.8-1SP-US-41

SMA Solar Sunny Boy 3.8kW 208/240VAC String Inverter - SB3.8-1SP-US-41

$1,768.84 USD
$ $1,768.84 USD
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Technical Details

  • SKU:PES-SPS-SIV-0549
  • Brands: SMA Solar
  • Documents:

    Datasheet
  • Height:19.8
  • Width:53.5
  • Length:73
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SMA Sunny Boy 3.8kW Single-Phase String Inverter

Model SB3.8-1SP-US-41 | 3,840W AC Output | 97.6% Efficiency | ShadeFix | AFCI UL 1699B | NEMA 3R | Multiple MPPT

3,840 W
AC Nominal Output Power
97.6%
Max Conversion Efficiency
6,144 Wp
Max PV Array Input

Product Overview

The SMA Sunny Boy SB3.8-1SP-US-41 is a high-performance 3.84kW single-phase string inverter engineered for residential solar panel systems across a wide range of installation environments. Delivering 97.6% peak conversion efficiency with multiple independent MPPT inputs, SMA's proprietary ShadeFix optimization technology, and built-in AFCI arc fault protection compliant with UL 1699B, it maximizes energy yield under real-world conditions while maintaining the highest levels of safety. The integrated wall-mount bracket, smartphone-based installation assistant, and NEMA 3R outdoor-rated enclosure combine to simplify installation, reduce labor costs, and ensure long-term reliability — backed by a warranty extendable up to 20 years.

Key Features

ShadeFix Shade Optimization: SMA's proprietary ShadeFix technology continuously evaluates every possible operating point on the inverter's power curve to identify the global maximum power point — delivering significantly higher energy yield in installations affected by partial shading from trees, chimneys, or neighboring structures compared to conventional MPPT approaches.

Multiple Independent MPPT Inputs: Multiple independent Maximum Power Point Trackers allow strings of different orientations, tilt angles, or lengths to be connected without compromising overall system performance — providing exceptional design flexibility for complex rooftop layouts, east-west configurations, and mixed-orientation arrays.

Smartphone Installation Assistant: An enhanced smartphone-based installation assistant guides installers through commissioning step by step via a mobile app — significantly reducing setup time, eliminating the need for a laptop or dedicated programming hardware, and enabling faster, more cost-effective field deployment for installers of all experience levels.

Built-In AFCI Arc Fault Protection: Compliant with UL 1699B arc fault circuit interrupter requirements, the SB3.8-1SP-US-41 continuously monitors for dangerous DC arc faults in the PV wiring — automatically interrupting the circuit to prevent electrical fires and ensuring full compliance with NEC Article 690 code requirements for residential solar installations.

Integrated Wall-Mount Bracket & NEMA 3R Enclosure: The built-in wall-mount bracket eliminates the need for a separate mounting kit, enabling fast, secure installation directly on any structural wall surface. The NEMA 3R-rated enclosure provides reliable protection against rain, sleet, and external ice formation — making the Sunny Boy suitable for both indoor and exposed outdoor installations.

How It Works

The Sunny Boy SB3.8-1SP-US-41 accepts DC electricity generated by your solar panels across a wide 100–550V MPPT operating range and converts it into clean, grid-compatible single-phase 240VAC power at up to 97.6% efficiency. ShadeFix continuously scans the full power curve to maximize yield, while the onboard AFCI monitors for arc faults in real time. Any surplus energy not consumed on-site is automatically exported to the utility grid, maintaining a stable and uninterrupted energy supply for the home.

DC Input & MPPT Voltage Tracking: The inverter accepts up to 6,144Wp of PV array input across a broad 100–550V MPPT operating voltage range, with a maximum DC input voltage of 600V — accommodating diverse string configurations and enabling installers to design flexible, cost-optimized arrays without over-engineering string lengths to fit a narrow voltage window.

ShadeFix Power Curve Optimization: Unlike standard MPPT algorithms that may lock onto a local power maximum, ShadeFix performs a full sweep of the inverter's operating curve at regular intervals to locate and track the true global maximum power point — ensuring maximum energy extraction from partially shaded arrays and delivering measurably higher annual yield in real-world installations.

AC Output & Grid Export: Converted AC power is delivered at the nominal 3,840W output rating in single-phase 240VAC — supplying household loads directly and automatically exporting any surplus generation to the utility grid, while the built-in grid management functions ensure compliance with local utility interconnection requirements and grid stability standards.

Technical Specifications

Manufacturer SMA Solar Technology
Model Number SB3.8-1SP-US-41
AC Nominal Output Power 3,840 W
Max PV Array Input Power 6,144 Wp
Max DC Input Voltage 600 V
MPPT Operating Voltage Range 100 – 550 V
Max Conversion Efficiency 97.6%
Shade Optimization SMA ShadeFix Technology
Arc Fault Protection AFCI — UL 1699B Compliant
Environmental Rating NEMA 3R — Indoor & Outdoor Rated
Operating Temperature Range -25°C to +60°C
Dimensions (W × H × D) 535 × 730 × 198 mm
Weight 26 kg (57.3 lbs)
Mounting Integrated Wall-Mount Bracket (Built-In)
Installation Tool Smartphone-Based Installation Assistant
Warranty 10 Years Standard — Extendable to 15 or 20 Years

Certifications & Compliance

Arc Fault Protection: UL 1699B AFCI Compliant — NEC Article 690 Ready
Environmental Rating: NEMA 3R — Rated for outdoor exposure including rain, sleet & ice
Shade Technology: SMA ShadeFix — Global Maximum Power Point optimization
Warranty: 10-Year Standard | Extendable to 15 or 20 Years

● Available | Contact us for lead time and pricing

Customer Reviews

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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.

SMA Sunny Boy 3.8kW Single-Phase String Inverter

Model SB3.8-1SP-US-41 | 3,840W AC Output | 97.6% Efficiency | ShadeFix | AFCI UL 1699B | NEMA 3R | Multiple MPPT

3,840 W
AC Nominal Output Power
97.6%
Max Conversion Efficiency
6,144 Wp
Max PV Array Input

Product Overview

The SMA Sunny Boy SB3.8-1SP-US-41 is a high-performance 3.84kW single-phase string inverter engineered for residential solar panel systems across a wide range of installation environments. Delivering 97.6% peak conversion efficiency with multiple independent MPPT inputs, SMA's proprietary ShadeFix optimization technology, and built-in AFCI arc fault protection compliant with UL 1699B, it maximizes energy yield under real-world conditions while maintaining the highest levels of safety. The integrated wall-mount bracket, smartphone-based installation assistant, and NEMA 3R outdoor-rated enclosure combine to simplify installation, reduce labor costs, and ensure long-term reliability — backed by a warranty extendable up to 20 years.

Key Features

ShadeFix Shade Optimization: SMA's proprietary ShadeFix technology continuously evaluates every possible operating point on the inverter's power curve to identify the global maximum power point — delivering significantly higher energy yield in installations affected by partial shading from trees, chimneys, or neighboring structures compared to conventional MPPT approaches.

Multiple Independent MPPT Inputs: Multiple independent Maximum Power Point Trackers allow strings of different orientations, tilt angles, or lengths to be connected without compromising overall system performance — providing exceptional design flexibility for complex rooftop layouts, east-west configurations, and mixed-orientation arrays.

Smartphone Installation Assistant: An enhanced smartphone-based installation assistant guides installers through commissioning step by step via a mobile app — significantly reducing setup time, eliminating the need for a laptop or dedicated programming hardware, and enabling faster, more cost-effective field deployment for installers of all experience levels.

Built-In AFCI Arc Fault Protection: Compliant with UL 1699B arc fault circuit interrupter requirements, the SB3.8-1SP-US-41 continuously monitors for dangerous DC arc faults in the PV wiring — automatically interrupting the circuit to prevent electrical fires and ensuring full compliance with NEC Article 690 code requirements for residential solar installations.

Integrated Wall-Mount Bracket & NEMA 3R Enclosure: The built-in wall-mount bracket eliminates the need for a separate mounting kit, enabling fast, secure installation directly on any structural wall surface. The NEMA 3R-rated enclosure provides reliable protection against rain, sleet, and external ice formation — making the Sunny Boy suitable for both indoor and exposed outdoor installations.

How It Works

The Sunny Boy SB3.8-1SP-US-41 accepts DC electricity generated by your solar panels across a wide 100–550V MPPT operating range and converts it into clean, grid-compatible single-phase 240VAC power at up to 97.6% efficiency. ShadeFix continuously scans the full power curve to maximize yield, while the onboard AFCI monitors for arc faults in real time. Any surplus energy not consumed on-site is automatically exported to the utility grid, maintaining a stable and uninterrupted energy supply for the home.

DC Input & MPPT Voltage Tracking: The inverter accepts up to 6,144Wp of PV array input across a broad 100–550V MPPT operating voltage range, with a maximum DC input voltage of 600V — accommodating diverse string configurations and enabling installers to design flexible, cost-optimized arrays without over-engineering string lengths to fit a narrow voltage window.

ShadeFix Power Curve Optimization: Unlike standard MPPT algorithms that may lock onto a local power maximum, ShadeFix performs a full sweep of the inverter's operating curve at regular intervals to locate and track the true global maximum power point — ensuring maximum energy extraction from partially shaded arrays and delivering measurably higher annual yield in real-world installations.

AC Output & Grid Export: Converted AC power is delivered at the nominal 3,840W output rating in single-phase 240VAC — supplying household loads directly and automatically exporting any surplus generation to the utility grid, while the built-in grid management functions ensure compliance with local utility interconnection requirements and grid stability standards.

Technical Specifications

Manufacturer SMA Solar Technology
Model Number SB3.8-1SP-US-41
AC Nominal Output Power 3,840 W
Max PV Array Input Power 6,144 Wp
Max DC Input Voltage 600 V
MPPT Operating Voltage Range 100 – 550 V
Max Conversion Efficiency 97.6%
Shade Optimization SMA ShadeFix Technology
Arc Fault Protection AFCI — UL 1699B Compliant
Environmental Rating NEMA 3R — Indoor & Outdoor Rated
Operating Temperature Range -25°C to +60°C
Dimensions (W × H × D) 535 × 730 × 198 mm
Weight 26 kg (57.3 lbs)
Mounting Integrated Wall-Mount Bracket (Built-In)
Installation Tool Smartphone-Based Installation Assistant
Warranty 10 Years Standard — Extendable to 15 or 20 Years

Certifications & Compliance

Arc Fault Protection: UL 1699B AFCI Compliant — NEC Article 690 Ready
Environmental Rating: NEMA 3R — Rated for outdoor exposure including rain, sleet & ice
Shade Technology: SMA ShadeFix — Global Maximum Power Point optimization
Warranty: 10-Year Standard | Extendable to 15 or 20 Years

● Available | Contact us for lead time and pricing

Customer Reviews

Be the first to write a review
0%
(0)
0%
(0)
0%
(0)
0%
(0)
0%
(0)

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.

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From hurricanes to blackouts, reliable solar power ensures you're able to keep your home & family safe no matter what comes your way.

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Making one-click solar solutions simple since 2018. Whether you’re powering a cabin, charging devices, or backing up your home.

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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.

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.

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Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Be Smart, Buy From an Authorized Dealer

When you choose Portlandia Electric Supply, you’re buying real products from a trusted company with established supplier relationships. Enjoy peace of mind with 100% manufacturer warranty coverage and lifetime customer support. In an age where online shopping is fraught with risks, it’s crucial to avoid fly-by-night websites that skirt regulations. Shop with confidence, knowing you’re getting genuine quality and reliable service.

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