@MattMan’s Solar
— · 81 videos curated
DIY off-grid solar power systems, battery storage, and energy independence for homes and structures.
All 81 videos
Solar Inverter Clipping: Why Your System May Waste 50% of Solar Power
Technical comparison of 16 solar inverters examining how battery-charging limits can cause solar power clipping in off-grid systems, with real-world examples and design trade-offs.
Boost MPPT Solar Charge Controller — How It Works
How boost MPPT charge controllers differ from standard controllers, when you'd need one, and design considerations for DIY solar installations.
Does Battery Voltage Really Matter? 12V vs 24V vs 48V Solar
Fifteen-minute technical comparison of battery system voltages for solar installations: amperage, wire sizing, safety, and when to use each voltage for RVs, mid-size, and whole-home systems.
MakeSkyBlue MPPT 60A V124 Solar Charge Controller Review
Eight-minute walkthrough of the MakeSkyBlue 60A MPPT charge controller: physical specs, wiring, configuration, monitoring via mobile app, and real-world off-grid installation.
Dyness 48V LiFePO4 Battery Review — Is This Battery Worth Buying?
Real-world testing and evaluation of a 48V LiFePO4 battery for DIY solar and off-grid systems, covering capacity, discharge capability, weather resistance, monitoring, inverter compatibility, and cold-weather limitations.
Why RV Solar Is Harder Than Home Solar (Live Q&A)
Live technical Q&A comparing solar design across home, RV, and mobile business contexts: battery sizing, shore power, common mistakes, and when solar makes sense.
ECO Worthy Cubix 48V 100AH Rack Mount Battery: Teardown & Real-World Testing
Teardown and capacity testing of a 51.2kWh LiFePO4 battery for DIY solar and off-grid systems, including internal construction review, BMS assessment, and inverter compatibility.
Clean and Paint Hinges on Vertical Solar Panels
Five-minute walkthrough on rust removal and corrosion prevention for hinged solar panel mounting hardware in humid climates using basic tools.
Battery Basics: How Much Battery Do You Really Need? (Part 2)
Thirty minutes on battery sizing for solar systems: amp-hours, voltage, watt-hours, kilowatt-hour calculations, and how to estimate the storage capacity your household actually needs.
Sizing 10 Battery Systems LIVE: From Hurricane Backup to Off-Grid Cabins
Walk through battery sizing for 10 real-world solar setups—hurricane backup, van builds, off-grid cabins, well pumps, and whole-home systems—using a repeatable 4-step method.
Sizing 10 Solar Battery Systems Live: From Hurricane Backup to Off-Grid
Walk through battery sizing for 10 real-world scenarios using a four-step method: daily consumption, inverter loss, autonomy days, and usable capacity. Covers hurricane backup, van builds, off-grid cabins, and common sizing mistakes.
Battery Wire Length Effects on Charging and Discharging - Test Results
Two-minute test comparing how wire length impacts charging and discharging performance in battery systems.
SOC Drift: When Your BMS Reports 100% But the Battery Isn't Full
One-minute explanation of state-of-charge drift in battery management systems: why your BMS can report a full charge when the battery is actually at 84%, and why this matters for off-grid reliability.
Battery Basics - What Are You Actually Buying (Part 1)
Understanding battery voltage, amp-hours, watt-hours, and chemistry when designing a solar power system: how 48V differs from 12V, why voltage matters for wiring and efficiency, LiFePO4 vs. lead-acid trade-offs.
Do Battery Cable Lengths Really Matter?
Testing conventional wisdom on LiFePO4 battery cable sizing, length, and resistance in real-world off-grid solar systems to understand actual voltage drop and safety impacts.
BigBattery Nexus 2 LiFePO4 Battery: Specifications, Upgrades, and Off-Grid System Integration
Detailed comparison of the BigBattery Nexus and Nexus 2 LiFePO4 batteries (16.08 kWh) for off-grid and whole-home backup systems, covering capacity, discharge rates, weather resistance, and inverter pairing options.
Power Stations vs DIY Solar — Is This All Most People Really Need?
Comparison of portable power stations and DIY solar systems for home backup power: what you can realistically run during outages, cost, complexity, and when each approach makes sense.
Complete Solar Inverter Upgrade: Replacing Dual EG4 with LZPower 10,000W System
Full teardown and installation of a 10,000W split-phase solar inverter system for an off-grid food trailer, including DC wiring, battery cables, safety disconnects, and real-world troubleshooting.
How I Installed Vertical Solar Panels (Cheap & Easy)
Four-minute DIY walkthrough: mounting solar panels vertically on a budget using hinges and 2x4s, with real-world performance notes and cost breakdown.
Live: Replacing Two Solar Inverters With One 10,000W Inverter
Real-time walkthrough of swapping two EG4 inverters for a single 10,000W LZPower unit in an off-grid food trailer: wiring, configuration, and testing.
Replacing Two Solar Inverters With One 10,000W Inverter — Live Installation
Live walkthrough of upgrading a food trailer's off-grid solar system from dual 3000W inverters to a single 10,000W unit: wiring, configuration, and real-world testing.
DIY Solar Beginner Masterclass: System Fundamentals and Design
Two-hour walkthrough of DIY solar system basics: how systems work, sizing calculations, component selection (inverters, wiring, protection), and real-world lessons from built installations.
WattCycle 12000 Super — Full Testing, Setup, Wiring & Final Thoughts
Eighteen-minute walkthrough of a 12kW split-phase inverter installation and real-world performance testing, including wiring, settings, monitoring, and key design limitations for off-grid solar arrays.
Wattcycle 12000 Super Power System — Wiring & First Startup
Step-by-step installation of a 12kW all-in-one inverter: mounting, battery and solar connections, wiring verification, first power-up, and initial performance metrics.
Off-Grid Solar System Performance: Day 2 Real-House Load Test
Real-world performance check of a 29.6 kW solar + 92 kWh battery system powering an entire house off-grid: battery levels, solar output, consumption data, and lessons learned.
First Night Off-Grid: Did It Survive?
Day-one performance report on a DIY household solar and battery system running overnight loads: what the batteries held, how the inverter performed, and system readiness.
Off-Grid System Test: 29.6 kW Solar, 92 kWh Battery, Real Household Loads
Real-world off-grid system walkthrough: 29.6 kW solar panels, 92 kWh battery storage, and full household loads tested together for the first time.
Wattcycle 12K Super: Unboxing, Specs, and Comparison to EG4 Inverters
27-minute technical review of the Wattcycle Super 12K off-grid inverter: internal build quality, specs, and side-by-side comparison with EG4 12000XP and 6000XP models.
Before You Buy a Solar Battery, Watch This — Masterclass Remix
Two-and-a-half-hour walkthrough of 12V to 48V battery system design, LiFePO4 chemistry, wiring, balancing, and real-world installation lessons from tested off-grid builds.
Solar Myth-Busting LIVE — What DIY Solar Advice Is Just Wrong?
MattMan Solar and Mike from Mike's Solar Garage debunk common misconceptions about DIY solar panels, batteries, inverters, and whole-home backup systems using hands-on experience.
Enphase Solar System Reset Troubleshooting
Two-minute walkthrough of a simple reset procedure for Enphase solar inverters when systems lose communication or stop producing.
I Screwed Up My DIY Solar System — Here's What I Learned
84-minute walkthrough of common DIY solar mistakes: wiring, battery design, inverter sizing, RV solar, expansion planning, and lessons from living with off-grid systems.
Why My AC-Coupling Experiment Failed (And How to Fix It)
Technical deep-dive into SolarEdge inverter configuration for AC-coupling: how to keep existing grid-tied solar systems running during utility outages.
Can Solar Panels Generate Power Without Direct Sun? Real-World Testing
Forty-nine-second test of how much power solar panels produce in clouds, shade, and low-light conditions versus ideal sunlight.
Can You Rely on Solar When It's Cloudy? Real Production Numbers
Real-world solar output measurements on a cloudy day, comparing new versus older panels and what happens when direct sunlight disappears.
What Happens When Your Solar Company Disappears?
Evaluating installer stability and warranty protections before signing a long-term solar installation contract.
How to Choose a Whole Home Solar Inverter — Beginner's Guide
Eighteen-minute walkthrough of solar inverter specifications: nominal power, surge capacity, split-phase output, solar input, and battery integration. Uses a real spec sheet to teach comparison skills.
Solar Panels Last 25 Years — Will Your Installer? Evaluating Long-Term Solar Reliability
How to assess solar installer stability, understand warranty structures, and design systems for 25-year longevity without dependence on a single company.
Why You Never Get 100% From Your Solar
How undersized wires, long cable runs, poor connections, and resistance losses reduce solar system efficiency — and how to recover that power.
637 Watts Gone: How to Find Hidden Power Loss in Your Solar System
Real-world solar system efficiency walkthrough: where energy gets lost across panels, wiring, charge controllers, inverters, and batteries—and what losses to expect.
AC Coupling: Use Your Solar When the Grid Goes Down
How AC coupling lets existing grid-tied solar systems power your home during outages using battery storage and a compatible inverter; real-world testing with the EG4 6000XP.
Can You Add Batteries to Grid-Tied Solar? (The Real Truth)
Retrofitting battery backup to an existing grid-tied solar system using AC coupling: wiring, configuration, and live testing with an EG4 inverter.
SOC Drift in LiFePO4 Batteries: Real Problem or Myth?
Testing whether State of Charge drift in LiFePO4 batteries causes real monitoring errors in DIY solar systems, and whether the numbers on your battery monitor actually match cell reality.
Solar Shed Truth: My Mistakes
Common DIY solar installation errors and how to avoid them, drawn from the creator's own hands-on experience building off-grid systems.
EG4 14.3kWh WallMount Lithium Battery for Off-Grid Solar Systems
Overview of the EG4 48V 280Ah LiFePO4 wall-mount battery: capacity, outdoor rating, and fit for whole-home backup or DIY solar installations.
LiFePO4 Battery State of Charge Accuracy: Testing Multiple BMS Platforms
Two-day test comparing State of Charge accuracy across EG4, BigBattery, and JK BMS platforms, and why periodically reaching full charge matters for calibration.
5 Things I Got Wrong With My DIY Solar System
Five design mistakes from scaling a DIY solar setup: busbar sizing, inverter capacity, charge controller planning, physical space, and wire management — lessons to avoid costly rebuilds.
Wiren Battery Communication: How Multiple 48V Batteries Sync
Short technical walkthrough of how Wiren 48V rack-mount batteries communicate and synchronize when wired together in a battery bank.
Testing The Vatrer 48V Rack Battery: Does It Beat The Competition?
Real-world review of a 48V LiFePO4 rack battery for off-grid solar systems, testing capacity, build quality, controls, connectivity, and performance in an actual coffee-trailer installation.
GIDROX 12V DC RV Air Conditioner
Demonstration of a 12-volt DC air conditioning unit designed to run on battery power without a generator, suited for off-grid solar setups.
GIDROX 12V DC RV Air Conditioner — Can It Really Run All Night on Batteries?
Complete installation and overnight battery test of a 12V DC air conditioner: power consumption, cooling performance, and whether it's practical for off-grid RV living.
10,000 Wh of Solar: How Much Reaches the Outlet?
Real-world efficiency walkthrough from solar panels to wall outlet, breaking down power losses at each step: wiring, MPPT controllers, battery storage, inverters, and connections.
10,000 Wh of Solar: How Much Power Reaches the Outlet?
Real-world efficiency losses across solar panels, wiring, charge controllers, batteries, and inverters — what percentage of your system's rated capacity actually powers your home.
AC Coupling Solar Systems: Making Grid-Tied Arrays Work Off-Grid
How to retrofit an existing grid-tied solar array with AC coupling so it generates power during grid outages—a technical solution to the grid-down solar shutoff problem.
10 Reasons to Not Purchase an EG4 3000EHV Inverter
Critical evaluation of the EG4 3000EHV 48V inverter: power limitations, voltage constraints, system complexity, and expansion trade-offs to consider before buying.
10 Reasons To Purchase an EG4 3000EHV Inverter
Technical walkthrough of the EG4 3000EHV 48V inverter for DIY solar systems: features, expandability, and real-world use cases for off-grid homes, RVs, and backup power.
BigBattery Nexus 48V 14.3kWh LiFePO4 Battery System
Quick overview of the BigBattery Nexus 48V LiFePO4 battery system for off-grid home backup and energy storage.
48V Battery Rack Wiring Cleanup: Organization and Maintenance
Eleven minutes reorganizing a 48V lithium battery rack for serviceability, safety, and future expansion—covering cable routing, busbar arrangement, and troubleshooting clarity.
Create a 48V Battery Bank from Four 12V Batteries — Complete How-To Guide
26-minute walkthrough wiring four 12V batteries in series to create a 48V battery bank: voltage math, capacity, matching requirements, balancing, charging, and safety considerations.
Microinverters vs Optimizers vs String Inverters
12-minute comparison of three solar power conversion architectures: how each works, trade-offs in shading, monitoring, cost, and which fits different home energy setups.
DIY Solar Roundtable: Build It. Maintain It. Upgrade It.
Three DIY solar builders compare approaches to designing maintainable systems, planning upgrades, and handling repairs and failures over time.
10 Reasons to Purchase an EG4 6000XP
Five-minute breakdown of the EG4 6000XP off-grid inverter: split-phase output, continuous power rating, PV input capacity, and practical use cases for cabins, RVs, and home backup systems.
What Size System Is Right for You
Three complete DIY solar backup systems ($1,500, $5,000, $20,000): parts lists, wiring, battery storage, and what each budget actually powers during an outage.
What Size DIY Solar System Do You Actually Need?
Three real-world DIY solar setups ($1.5K–$20K) compared: what each powers, equipment needed, and where budget goes.
Wiren Battery to 6000XP Communication Setup
Step-by-step guide to connecting and configuring a Wiren LiFePO4 battery with an EG4 6000XP inverter via CAN cable for off-grid solar systems.
Victron SmartShunt Reporting as a Charger
Configure your Victron SmartShunt to report charger data into VRM and GX devices for accurate off-grid solar system monitoring.
Wiren Battery 100AH 48V Rack Mount
Detailed walkthrough of a 48V LiFePO4 rack-mount battery: build quality, installation, BMS communication, inverter compatibility, and how it fits DIY off-grid solar systems.
Storm Damage Test: New Prism Solar 445W Bifacial Panels in Florida Rain
Real-world durability test of a DIY bifacial solar array after a major Florida rainstorm—what fails, what holds, and what you learn about panel resilience.
Most People Size Their Solar Wrong—Here's Why
Step-by-step guide to designing a DIY solar system: load sizing, battery capacity, panel selection, inverters, wiring, and avoiding costly mistakes in off-grid or backup installations.
This Solar Supplier Actually Delivers On Time
One-minute review of Signature Solar as a reliable DIY solar equipment supplier for off-grid cabins, RV systems, and whole-home backup power.
Used vs. New Solar Panels: Real-World Performance and Cost Comparison
Three-hour livestream comparing used and new solar panels with performance data, cost breakdowns, and guidance for home backup, RV, and off-grid applications.
445W Bifacial Solar Panels—Game Changer for Off-Grid?
22-minute walkthrough upgrading a DIY off-grid solar array: panel selection, string layout, mounting, charge-controller setup, and production comparison between new bifacial and used panels.
Want to Power Your Entire Home?
Introduction to whole-home solar systems: 48V battery banks, hybrid inverters, AC coupling, and backup power for energy independence.
Where Real Solar Builders Buy Their Gear
Matt McIntosh recommends Signature Solar as his go-to supplier for DIY solar panels, inverters, batteries, and complete backup systems for off-grid and grid-tied installations.
Use PVWatts to Size Panels: Account for Tilt and Losses
Step-by-step walkthrough on using PVWatts software to accurately size solar panels for your system, factoring in roof tilt, regional losses, and real-world performance.
Wiren Battery Rack Modification for EG4 LifePower4 Batteries
29-minute walkthrough: welding modifications to fit EG4 LifePower4 batteries into a budget Wiren rack, with cost comparison and lessons learned.
Most People Don't Need a Huge Solar System
Right-sizing solar installations for sheds, workshops, and cabins: when smaller systems make practical and financial sense.
FCC Just Banned Foreign Solar Inverters… Does This Affect YOU?
Analysis of FCC restrictions on foreign solar inverters: what changed, who it affects, implications for grid-tied and off-grid systems, and what homeowners should know.
Grid-Tied Solar Was a Mistake… Can AC Coupling Fix It?
How to add battery backup to an existing grid-tied solar system using AC coupling without replacing your inverter, keeping your solar working during grid outages.
Why I Spent $300 on an Energy Monitor
Testing the Refoss Smart Energy Monitor EM16P to track real-time household electricity usage and optimize power management in DIY solar systems.
Solar Backup for Hurricanes, Blackouts & Disasters
Live roundtable on designing and using solar + battery backup systems for home power during hurricanes, blackouts, and other disasters, with real-world lessons and common mistakes.