# Solar Analytica

> Independent, data-driven solar intelligence — inverter fault libraries, engineering tools and plain-English technology guides. Transparency through data.

Solar Analytica is an independent, manufacturer-neutral reference for solar inverter fault codes, engineering calculators and plain-English explainers on solar technology. Everything is free to use, evidence-first and openly documented. Content is reviewed for currency (last site-wide review: June 2026).

## Fault Libraries
Documented inverter and battery error/alarm codes by manufacturer.
- [Huawei Inverter Error Codes](https://solaranalytica.com/huawei-inverter-error-codes): Major and minor alarm codes for Huawei SUN2000 residential and commercial inverters, with plain-English causes and field-tested fixes.
- [Sungrow Alarm Codes](https://solaranalytica.com/sungrow-alarm-codes): The complete Sungrow fault reference — string, SH hybrid and battery families — with every alarm number searchable and grouped by root cause.
- [Solis Alarm Codes](https://solaranalytica.com/solis-alarm-codes): Solis (Ginlong) inverter alarm codes covering grid, insulation, temperature and hardware faults, with diagnostic next steps.
- [Growatt Error Codes](https://solaranalytica.com/growatt-error-codes): Growatt's dual numbered-and-named error scheme decoded — what each Error and Warning means, and whether it needs an installer.
- [GoodWe Error Codes](https://solaranalytica.com/goodwe-error-codes): GoodWe inverter error codes for grid, isolation, temperature and internal faults, with clear guidance on self-recovery versus service.
- [Fronius Error Codes](https://solaranalytica.com/fronius-error-codes): Common Fronius State codes — including the Australian Volt-Watt and Volt-VAr grid-protection states — explained for owners and installers.
- [SMA Error Codes](https://solaranalytica.com/sma-error-codes): Frequent SMA Sunny Boy and Tripower event codes, what triggers them, and the difference between a momentary grid event and a real fault.
- [Enphase Microinverter Error Codes](https://solaranalytica.com/enphase-microinverter-error-codes): Plain-English guide to the events Enphase IQ microinverters report in the app — grid, DC, temperature and reporting — and what each one means.
- [SolaX Inverter Error Codes](https://solaranalytica.com/solax-inverter-error-codes): Common SolaX string and hybrid inverter fault codes explained, with likely causes and what to check.
- [Deye Inverter Fault Codes](https://solaranalytica.com/deye-inverter-fault-codes): Common Deye string and hybrid inverter fault codes decoded, with plain-English causes and fixes.
- [Tesla Powerwall Alert Codes](https://solaranalytica.com/tesla-powerwall-alert-codes): What Tesla Powerwall's app alerts mean — from Breaker Open to Storm Watch — explained in plain English.
- [Sigenergy SigenStor Fault Codes](https://solaranalytica.com/sigenergy-sigenstor-fault-codes): Common SigenStor alarms (the 1000-series inverter codes) explained, with what each points to and what to check.

## Explainers
Plain-English guides to the technology behind solar systems.
- [HJT Solar Technology, Explained](https://solaranalytica.com/hjt-solar-technology): How heterojunction cells fuse crystalline and thin-film silicon to push efficiency higher — and what that means for real-world yield.
- [Solar Cell Busbars & Multi-Busbar Design](https://solaranalytica.com/solar-cell-busbars): Why busbar count keeps rising — from 5BB to MBB and beyond — and how finer conductors cut resistive loss and improve reliability.
- [AC vs DC Solar Panels](https://solaranalytica.com/ac-vs-dc-solar-panels): String inverters, microinverters and DC optimisers compared — where the conversion happens and which architecture fits your roof.
- [Solar Panel Orientation & Tilt](https://solaranalytica.com/solar-panel-orientation): How azimuth and tilt shape annual yield and self-consumption — and why the textbook-optimal angle is rarely the smartest one.
- [How to Read a Solar Panel Datasheet](https://solaranalytica.com/reading-a-solar-datasheet): Decode STC vs NOCT, temperature coefficients, tolerance and degradation so you can compare modules on the numbers that matter.
- [TOPCon Solar Cells, Explained](https://solaranalytica.com/topcon-solar-cells): What TOPCon (Tunnel Oxide Passivated Contact) cells are, how the passivating contact works, and how they compare with PERC and HJT on efficiency, temperature, bifaciality, degradation and cost.
- [Bifacial Solar Panels, Explained](https://solaranalytica.com/bifacial-solar-panels): How bifacial modules capture rear-side light, what bifaciality factor and albedo mean, and why ground-mount arrays gain far more than typical rooftops.
- [LFP vs NMC: Home Battery Chemistry](https://solaranalytica.com/lfp-vs-nmc-home-batteries): A plain-English, manufacturer-neutral comparison of LFP and NMC lithium battery chemistries for home storage, covering energy density, cycle life, safety, temperature behaviour, cost, and why most new home batteries now use LFP.
- [Solar Export Limiting, Explained](https://solaranalytica.com/solar-export-limiting): What export limits are, why Australian networks apply them, the move from fixed and zero limits to dynamic exports, and how it all shapes system sizing and self-consumption.
- [Virtual Power Plants (VPP), Explained](https://solaranalytica.com/virtual-power-plants): What a virtual power plant is, how aggregated home batteries earn money providing grid services, and the real trade-offs for owners — in plain Australian English.
- [Microinverters vs String Inverters](https://solaranalytica.com/microinverters-vs-string-inverters): How microinverters and string inverters differ on shade tolerance, monitoring, redundancy, cost and roof complexity — and which suits your site.

## Tools
Transparent, in-browser solar calculators — no sign-up, nothing stored.
- [Solar System Size Calculator](https://solaranalytica.com/solar-system-size-calculator): Turn your daily energy use, sun hours and system losses into a recommended array size, panel count and inverter rating.
- [Solar Payback Calculator](https://solaranalytica.com/solar-payback-calculator): Estimate annual savings and payback period from system cost, generation, self-consumption, electricity rate and feed-in tariff.
- [Solar Panel Power Density Calculator](https://solaranalytica.com/solar-panel-density-calculator): From rated power and module dimensions, compute power density in W/m², module efficiency and panels needed per kilowatt.
- [Single or Three-Phase Power?](https://solaranalytica.com/single-or-three-phase-power): Answer a few questions about your supply and system size to see whether single or three-phase is the right fit — and why it matters for solar.
- [Solar Battery Size Calculator](https://solaranalytica.com/solar-battery-size-calculator): Size a home battery from your overnight energy use, days of autonomy, depth of discharge and round-trip efficiency.
- [Solar STC Rebate Calculator (Australia)](https://solaranalytica.com/solar-stc-rebate-calculator): Estimate the federal STC incentive on an Australian solar install from system size, your zone rating, deeming years and the STC price.
- [Solar Cable Voltage Drop Calculator](https://solaranalytica.com/solar-cable-voltage-drop-calculator): Work out voltage drop on a DC string or single-phase AC run from length, current, conductor size and material — checked against AS/NZS guidance.
- [Tilt & Orientation Yield Estimator](https://solaranalytica.com/solar-tilt-orientation-calculator): Get an indicative annual-yield figure for a roof from its direction and pitch, relative to an optimally-oriented array.
- [Solar String Sizing Calculator](https://solaranalytica.com/solar-string-sizing-calculator): Work out how many panels can go in series on a string — within the inverter's MPPT window and under the maximum system voltage — using temperature-corrected module voltages.
- [DC:AC Ratio (Inverter Load Ratio) Calculator](https://solaranalytica.com/solar-dc-ac-ratio-calculator): Check the ratio of array DC capacity to inverter AC rating — the inverter load ratio — and see whether it sits in the typical range or risks clipping.

## Reference
- [Field Guides hub](https://solaranalytica.com/field-guides): All fault libraries and explainers
- [Tools hub](https://solaranalytica.com/tools): All interactive calculators
- [Glossary](https://solaranalytica.com/glossary): Solar terms, defined
- [Methodology](https://solaranalytica.com/methodology): How we research, score and verify
- [About](https://solaranalytica.com/about): Who we are — independent since 2024
- [Search](https://solaranalytica.com/search): Search the full library

## Optional
- [Fault code data (JSON)](https://solaranalytica.com/fault-codes.json): Open data — every documented fault code, free with attribution
- [RSS feed](https://solaranalytica.com/feed.xml): New guides and tools
- [Sitemap](https://solaranalytica.com/sitemap.xml): XML index of every page
- [review.solar](https://solaranalytica.comhttps://review.solar): Sister site — product scorecards for panels, batteries and inverters