Solar Guides
Practical guides for DIY solar installation — from string sizing to equipment compatibility.
TechnologyBeginner
Solar Panel Dimensions and Weight Explained
Standard solar panel sizes, dimensions and weight — and why 82% of modern panels are exactly 1134 mm wide. Verified against 542 real panel series.
15 min7/25/2026
InvertersString SizingBeginner
Solar Panels for Off-Grid Inverters: Sizing Guide
How many panels fit a 12V, 24V or 48V off-grid inverter? PV voltage windows, cold-weather Voc, power caps and worked examples with real models.
14 min7/19/2026
String SizingBeginnerSafety
Can You Mix Different Solar Panels? Rules & Losses
Mixing solar panels of different wattage, brand, or age? Learn the series and parallel rules, how much power you lose, and when it's safe to do it.
13 min6/25/2026
InvertersBeginnerTechnology
Adding a Battery to Existing Solar (AC vs DC)
Already have grid-tied solar? Add battery backup for blackouts — AC vs DC coupling, when to replace your inverter, 2026 costs, and how much battery you need.
14 min6/7/2026
InvertersIntermediateTechnology
How MPPT Works: Algorithms and PWM Comparison
See how an MPPT controller finds the maximum power point, which tracking algorithms it uses, and why it harvests 10–30% more energy than PWM.
18 min5/28/2026
SafetyBeginnerStandards
Solar Fuses and Breakers: DC and AC Sizing Guide
Size DC string fuses and AC breakers safely. Learn NEC 690.9 and IEC 62548 rules, gPV vs gG types, breaking capacity, and avoid common mistakes.
13 min5/25/2026
TechnologyInvertersBeginnerSafety
Cloud-Edge Effect: Why Solar Panels Exceed Rated Power
Cloud edges briefly push irradiance to 1200 W/m², so panels output above nameplate. What it means for clipping, fuses, and inverter sizing.
13 min4/29/2026
InvertersIntermediatePerformance
Inverter Clipping: How Much Energy You Really Lose
Inverter clipping explained: annual losses by DC/AC ratio, when it pays off, and when it hurts. Worked example: 14.7 kWp on an 8 kW Deye hybrid in Kyiv.
13 min4/29/2026
InvertersBeginnerTechnology
Microinverters vs String Inverters: 2026 Complete Guide
Microinverter vs string inverter compared in 2026: cost per watt, shading, NEC 690.12, batteries, and which technology fits your roof.
14 min4/25/2026
TechnologyBeginnerTemperature
NOCT vs STC: Why a 580W Panel Really Makes ~440W
STC is a 25°C lab test — NOCT is closer to your roof, typically 75% of the label power. Learn to read both ratings and predict real solar panel output.
13 min4/18/2026
SafetyTechnologyBeginner
LiFePO4 Cell Terminals: Types, Torque, Internal Resistance
DIY guide: four terminal types on prismatic LiFePO4 cells, M4–M8 torque specs, measuring internal resistance with YR1035+, and EVE vs CATL vs REPT compared.
20 min4/17/2026
BeginnerSafetyStandards
MC4 Solar Connectors: Types, Brands & Selection
Guide to MC4 solar connectors. Top 5 brands vs Chinese clones, connector types, crimping tools, and how to choose the right connectors for your panels.
14 min4/13/2026
BeginnerSafetyTechnology
Solar Battery Sizing Guide for Hybrid & Off-Grid (2026)
Calculate the right battery capacity for your hybrid or off-grid solar system. Formulas, DoD math, real inverter pairings, common mistakes.
14 min4/11/2026
TechnologyBeginnerTemperature
Most Efficient Solar Panels 2026: Top 15, up to 25.9%
JinkoSolar's Tiger Neo 5.0 opens the 25.9% era; AIKO INFINITE ULTRA holds 25.6% and three panels 25.0%. All 15 ranked by real specs and TcPmax.
18 min3/31/2026
BeginnerString SizingSafety
Ground-Mounted vs Rooftop Solar Panels
Compare ground-mounted and rooftop solar: cost, efficiency, string sizing, and voltage drop. Find the best mounting option for your home.
14 min3/30/2026
BeginnerTechnologySafety
Solar Panel Shading: How It Affects Your String
Learn how partial shading reduces solar string output, how bypass diodes work, and practical solutions to minimize power loss.
13 min3/24/2026
TechnologyBeginner
Solar Panel Degradation Rate Explained
Learn how fast solar panels degrade, compare PERC vs TOPCon vs HJT lifespan, and see year-by-year power output projections over 30 years.
13 min3/22/2026
TechnologyBeginner
Bifacial Solar Panels: Complete Guide to Dual-Sided Generation
How bifacial panels work, why shading only matters on the front side, and how much extra energy the rear side delivers. Real-world examples and formulas.
13 min3/21/2026
BeginnerTechnology
Solar Panel Datasheet: Every Spec Explained
Learn what Voc, Vmpp, Isc, Impp, Pmax, and temperature coefficients mean on a solar panel datasheet — and why each one matters for your installation.
14 min3/21/2026
String SizingInvertersBeginner
How to Distribute Panels Across MPPT Inputs
When to use one MPPT vs two, how to split east/west panels, and why your inverter's MPPT inputs may not be rated the same — with a worked example.
15 min3/21/2026
InvertersBeginnerSafety
Solar Panel Oversizing Guide: DC/AC Ratio Limits
When can you oversize solar panels on an inverter? Safe DC/AC ratios (1.3–2.0), clipping losses, voltage trap — explained with a real calculation example.
13 min3/21/2026
SafetyBeginner
Solar Cable Sizing Chart: 2.5–10 mm² + Voltage Drop
Sizing chart for 2.5, 4, 6 and 10 mm² solar cable: pick the gauge by current, calculate voltage drop, avoid AWG-to-metric mistakes. With worked examples.
12 min3/21/2026
InvertersBeginner
On-Grid vs Hybrid vs Off-Grid Inverters (2026)
On-grid, hybrid and off-grid solar inverters compared: battery support, blackout backup, cost, ROI. Find the right type for grid-tied or remote setups.
14 min3/21/2026
TechnologyBeginner
Best Solar Panel Brands 2026: Aiko, LONGi & 7 More
Which solar panel brand should you buy in 2026? Nine makers ranked on measured efficiency, real warranty terms and who is financially safe.
17 min3/21/2026
String SizingBeginnerSafety
How to Replace Discontinued Solar Panels in an Existing String
A practical guide to finding compatible replacement panels when the originals are discontinued. Learn which specs must match and how to verify compatibility.
12 min3/20/2026
TechnologyString Sizing
HJT Solar Panels: How Heterojunction Changes String Sizing
Learn how HJT panels' superior temperature coefficient fits more panels per string. Worked examples comparing HJT vs TOPCon vs PERC setups.
13 min3/19/2026
InvertersBeginnerString Sizing
How to Choose an Inverter for Your Solar Panels
Learn how to choose the right solar inverter: voltage and current compatibility, DC/AC ratio, MPPT sizing, and a step-by-step checklist with a worked example.
15 min3/19/2026
String SizingBeginnerSafety
Solar Panel String Sizing: A Complete Beginner's Guide
Learn how to calculate the right number of solar panels per string. Covers voltage limits, temperature effects, MPPT range, and common mistakes.
16 min3/18/2026
TemperatureBeginnerSafety
What's a Good Solar Panel Temperature Coefficient?
Heat cuts power, cold pushes voltage toward inverter limits. Which %/°C values are good, how to read them on a datasheet, and how to size strings safely.
11 min3/18/2026
TechnologyBeginner
PERC vs TOPCon vs HJT: Which Panel Wins in 2026?
HJT hits 24.5% efficiency and −0.24%/°C in heat, TOPCon wins on price, PERC is fading. Real datasheet numbers: efficiency, degradation, cost — head-to-head.
12 min3/18/2026
String SizingBeginnerSafety
Solar Panel Wiring: Series vs Parallel Explained
Learn when to wire solar panels in series, parallel, or both. Includes voltage and current formulas, a worked example, and a free compatibility calculator.
14 min3/18/2026
TechnologyBeginner
How Many Cells in a Solar Panel? 60 vs 72 vs 144
60, 72, 120 and 144-cell solar panels compared: voltage, size and where each fits. Why half-cut cells doubled the count — and what it means for your roof.
12 min3/18/2026