The background reading behind our calculators — plain-English, updated for 2026, and honest about what changed this year.
The real math behind system sizing — usage, sun hours, roof space — and where most quotes get it wrong.
MoneyThe 30% federal credit is gone for owned systems. Here's what still works and what to check locally.
StorageUsable vs. rated capacity, chemistry trade-offs, real installed cost, and the math on payback.
MoneyWhy two homes with identical panels can get very different bills — and how to check yours.
MoneyTwo completely different ways utilities pay for solar exports — and why mixing them up costs money.
Product GuideAn independent cost and savings estimate — not another installer lead form.
MoneyFour ways to go solar, one honest comparison of what each actually costs you over 20 years.
SizingPanels, battery, backup generator and the realistic budget for going fully independent.
State ComparisonTwo of the biggest solar markets in the country, compared head to head with real numbers.
State ComparisonBoth sunny, both expensive electricity — but very different net metering rules.
State ComparisonTwo sunbelt giants with very different net metering policies.
State ComparisonNeighboring states, both with strong incentive programs — here's the real gap.
State ComparisonNeighboring southeast states with a real gap in net metering strength.
State ComparisonTwo of the strongest incentive states in the country, compared directly.
Storage GuideThe technical difference between AC-coupled and DC-coupled solar battery systems, and which one fits new installations versus retrofits.
Storage GuideWhat changes financially when you retrofit a battery onto an existing grid-tied solar system, and how to figure out if it pays back for your
Storage GuideWhat C-rate and depth of discharge actually mean for battery storage, why lithium and lead-acid batteries are sized so differently, and how
Storage GuideWhy sizing a battery for daily solar self-consumption is a different calculation than sizing for outage backup, and how to balance both goal
Storage GuideHow the three most common home battery chemistries actually differ in safety, lifespan, and cost, and which one fits which use case.
Sizing GuideHow electricity fits into a household's total carbon footprint alongside transportation, heating fuel, and consumption — and where the bigge
Money GuideWhat to actually ask a solar installer beyond the quoted price — experience, equipment, workmanship warranty, and how they handle problems.
Sizing GuideHow to actually pick a solar system size — matching your usage, roof space, and budget rather than defaulting to a generic 'average home' nu
Sizing GuideWhy solar panels actually perform better electrically in cold weather even as production drops, and what winter really means for system desi
Sizing GuideAddressing persistent myths about solar panels — cloudy day production, roof damage, maintenance needs, and more — with what's actually true
Rates GuideHow Community Choice Aggregation programs work, where they exist, and how they differ from full retail electricity deregulation.
Sizing GuideHow community solar subscriptions actually compare to owning rooftop panels — savings, commitment, and who each option genuinely fits.
Sizing GuideA framework for comparing solar panel warranties across different manufacturers beyond just the headline year count.
Rates GuideHow deregulated electricity markets work, where they exist, and what genuinely changes when you can choose your own electricity supplier.
Money GuideWhat DIY solar installation actually saves versus a professional install, the real risks involved, and where a hybrid approach makes sense.
Money GuideWhat research and appraisal practice actually show about solar's effect on home value, and the factors that determine whether it helps or co
Sizing GuideHow much weight solar panels actually add to a roof, why most homes handle it easily, and the specific situations that warrant a structural
Rates GuideHow member-owned electric cooperatives differ from investor-owned and municipal utilities, and what that means for rates and solar policy.
Sizing GuideHow long it takes a solar panel to offset the emissions from its own manufacturing, and what research actually shows about this often-asked
Money GuideHow to get a reasonable solar savings estimate using your own bill and our calculators before ever talking to an installer.
EV GuideWhat a typical EV battery warranty covers, common capacity retention thresholds, and what voids coverage before you assume you're protected.
EV GuideHow to pick the right amperage for a home EV charger circuit based on your vehicle, daily mileage, and panel capacity — more isn't always ne
EV GuideWhy adding an EV charger sometimes requires a panel upgrade, how to check if yours has capacity, and what load management devices can do ins
EV GuideBasic etiquette for using shared workplace, apartment, or public EV chargers, and practical tips for a smoother charging experience.
EV GuideWhat Level 1, Level 2, and DC fast (Level 3) EV charging actually mean, realistic charging times for each, and where you'd use them.
EV GuideA practical guide to EV home charging cost per mile, Level 1 vs Level 2 charging time, and how it stacks up against gasoline.
EV GuideHow battery size and efficiency differences across popular EV models change home charging cost and time — with dedicated calculators for eac
EV GuideHow real-world EV range compares to concerns about running out of charge, and what the actual daily mileage data suggests about range anxiet
EV GuideHow EV price premium, energy cost, and maintenance actually net out against a gas car over 5 years, and what changes the breakeven point.
Sizing GuideHow hurricane, wildfire, and extreme heat considerations are shaping modern solar and battery system design in affected regions.
BasicsA guide to navigating Solargrin's full calculator library by category — solar sizing, money, storage, and electrical — to find the right too
Backup Power GuideHow gasoline, propane, and diesel generators actually compare on cost, storage, and reliability, and which fuel type fits which backup power
Backup Power GuideA practical comparison of gas generators, home batteries, and portable solar power stations for backup power — cost, convenience, and where
Sizing GuideThe real differences between utility-scale solar farms and residential rooftop solar, and how large-scale solar affects your own electricity
Sizing GuideThe real differences between grid-tied and off-grid solar systems, why most homeowners want grid-tied, and when going fully off-grid actuall
Money GuideBeyond the headline quote — permitting, roof repairs, tree trimming, monitoring fees, and other costs that can catch new solar owners off gu
Electrification GuideComparing heat pumps, heat pump water heaters, and other home electrification upgrades on cost and impact, to help decide what to prioritize
EV GuideWhat factors cause real-world EV charging costs to differ from calculator estimates, and how to get a more precise number for your situation
Storage GuideHow to pick a realistic outage duration to size a home battery around, and why sizing for the average outage often beats sizing for the wors
Policy GuideNet metering isn't one policy — it's dozens of different state and utility rules. Here's what actually changes and why it matters for your p
Sizing GuideWhat to expect if you need to file a solar equipment or workmanship warranty claim, from documentation to typical resolution timelines.
Rates GuideWhy Texas electricity bills involve a separate delivery utility and retail provider, how that affects solar, and what to know before shoppin
Money GuideWhy comparing solar quotes for different-sized systems takes more than looking at the total price, and how to normalize the comparison prope
Sizing GuideWhat a professional home energy audit actually measures, how to read the results, and how to prioritize the recommendations it generates.
BasicsA plain-English walkthrough of what's actually on an electric bill — usage charges, fixed fees, tiers, and how to reverse-engineer your real
Sizing GuideWhat the numbers on a typical solar monitoring app actually mean, and how to tell if your system is performing normally.
Sizing GuidePractical approach for navigating HOA approval for solar panels, including state solar rights laws that may limit what an HOA can restrict.
Sizing GuideWhat happens during the utility interconnection process for a new solar system, typical timelines, and why it's a separate step from permitt
Money GuideWhy the same solar system pays back at very different speeds depending on your specific utility's rate and net metering terms, with real exa
Storage GuideHow a hybrid (all-in-one) inverter compares to a separate solar inverter plus battery inverter, and which setup fits new installs versus ret
Sizing GuideWhat inverter clipping actually is, why installers often intentionally size an inverter smaller than the panel array, and when it's a genuin
BasicsThe difference between kW and kVA on generator and inverter spec sheets, why it matters for sizing, and how power factor connects the two.
BasicsWhat a megawatt-hour is, when you'd encounter it instead of kWh, and how to convert between the two without confusion.
Sizing GuideWhat a microgrid actually is, how community and neighborhood microgrids differ from a single home's solar and battery system.
Storage GuideHow MPPT and PWM charge controllers actually differ, when MPPT's extra cost pays for itself in energy harvested, and when it doesn't.
Rates GuideHow municipal and public power utilities differ from investor-owned ones, and why that distinction can genuinely change your solar economics
Sizing GuideWhy a solar system's rated capacity and its actual real-world production always differ, and what factors explain the gap.
Sizing GuideWhat a net-zero home actually means, how solar sizing fits alongside efficiency measures, and realistic paths to reach it.
Off-Grid GuideHow solar sizing changes for a weekend cabin, workshop shed, RV, or van build versus a full house — battery-first thinking, realistic wattag
Off-Grid GuideHow solar water pumping works without a battery, why most setups run direct-drive, and how to size a panel for livestock watering or garden
Sizing GuideWhy fewer high-wattage panels and more lower-wattage panels can produce the same system size, and how to decide which approach fits your roo
Storage GuideHow portable power stations and whole-home battery systems actually differ in capacity, cost, and use case, and how to tell which one fits y
Sizing GuideA practical checklist for getting a solar and battery system ready for winter — production expectations, battery cold-weather considerations
Rates GuideHow Public Utility Districts (PUDs) work, why they're common in the Pacific Northwest, and what they mean for rates and solar policy in that
Sizing GuideHow long solar equipment actually lasts in practice — panels, inverters, and batteries each age differently, and knowing which fails first c
Energy GuideHow much phantom (standby) power actually costs, which devices are the worst offenders, and simple, free ways to cut it.
Money GuideHow electricity rate inflation actually factors into solar payback calculations, and why ignoring it can understate a system's real long-ter
Sizing GuideHow much roof direction and tilt angle actually affect solar production, and why a less-than-perfect roof still often works well.
Sizing GuideWhy sizing solar off your actual kWh usage beats generic rules of thumb, and how to find your real number even without a bill in hand.
Sizing GuideHow smart thermostats can work alongside solar production to shift HVAC usage toward daytime generation and improve overall system value.
Sizing GuideHow snow load affects solar panel structural requirements and production, and what's different about designing a system for a snowy climate.
State ComparisonA head-to-head comparison of solar economics in Arizona and Nevada — rates, typical system cost, payback and incentives, with real 2026 numb
State ComparisonA head-to-head comparison of solar economics in Colorado and Utah — rates, typical system cost, payback and incentives, with real 2026 numbe
State ComparisonA head-to-head comparison of solar economics in Connecticut and Massachusetts — rates, typical system cost, payback and incentives, with rea
Sizing GuideHow rural solar installations differ from suburban ones — ground mounts, well pumps, longer wire runs, and cooperative-specific policy consi
Sizing GuideWhy a city-level solar cost estimate can differ meaningfully from a state average, using real examples like San Diego vs California and Sacr
Money GuideWhy cost per watt is the fairest way to compare solar quotes of different sizes, what a normal range looks like, and what can push it higher
Sizing GuideWhat UL and IEC certifications on solar equipment actually verify, and why they matter for safety and insurance purposes.
Financing GuideWhat credit score typically qualifies for solar financing, how it affects your rate, and options if your credit doesn't meet standard requir
Financing GuideWhat origination fees, dealer fees, and other closing costs on solar loans actually mean for your total cost, and how to spot them in a quot
Sizing GuideHow solar sizing and ownership work differently for duplexes, triplexes, and small multi-family properties compared to a single-family home.
State ComparisonA head-to-head comparison of solar economics in Hawaii and California — rates, typical system cost, payback and incentives, with real 2026 n
State ComparisonA head-to-head comparison of solar economics in Illinois and Indiana — rates, typical system cost, payback and incentives, with real 2026 nu
Sizing GuideHow extreme heat and dust actually affect solar panel performance in desert climates, and why strong sun still usually wins out on productio
Money GuideState tax credits, utility rebates, property tax exemptions, and other solar incentives that stack with (or exist independently of) the fede
Financing GuideWhy the monthly payment isn't the whole story on a solar loan, how APR and term length change total cost, and what to watch for in promotion
State ComparisonA head-to-head comparison of solar economics in Michigan and Ohio — rates, typical system cost, payback and incentives, with real 2026 numbe
State ComparisonA head-to-head comparison of solar economics in Minnesota and Wisconsin — rates, typical system cost, payback and incentives, with real 2026
State ComparisonA head-to-head comparison of solar economics in Nevada and California — rates, typical system cost, payback and incentives, with real 2026 n
State ComparisonA head-to-head comparison of solar economics in North Carolina and South Carolina — rates, typical system cost, payback and incentives, with
Sizing GuideWhat renters and apartment dwellers can actually do about solar — community solar, portable panels, and what to ask a landlord before assumi
Sizing GuideHow black-frame panels, solar shingles, and other aesthetic options compare to standard panels on cost and appearance.
Sizing GuideHow much dirt and dust really cost you in lost solar production, when professional cleaning pays for itself, and when rain does the job for
Sizing GuideHow solar panel efficiency and degradation actually work, what warranties really guarantee, and how much production to expect at year 10, 15
Sizing GuideHow state-level approaches to solar panel end-of-life and recycling regulation differ, and why this is a rapidly evolving policy area.
Money GuideHow adding solar panels typically affects homeowners insurance, what to tell your insurer, and coverage gaps worth checking for.
State ComparisonA head-to-head comparison of solar economics in Pennsylvania and Ohio — rates, typical system cost, payback and incentives, with real 2026 n
Sizing GuideWhy solar permitting can take days in one city and months in another, and what factors actually drive the difference.
Sizing GuideHow solar pool heating (thermal) differs from solar electric panels, and why it's often one of the fastest-payback solar investments availab
Sizing GuideHow partial shading disproportionately cuts solar production, why one shaded panel can drag down an entire string, and when microinverters a
Sizing GuideHow solar trackers that follow the sun compare to fixed-mount panels on production gain versus added cost and complexity.
State ComparisonA head-to-head comparison of solar economics in Virginia and Maryland — rates, typical system cost, payback and incentives, with real 2026 n
Sizing GuideThe three different types of solar warranty — equipment, performance, and workmanship — and what each actually covers when something goes wr
State ComparisonA head-to-head comparison of solar economics in Washington and Oregon — rates, typical system cost, payback and incentives, with real 2026 n
Rates GuideHow time-of-use electricity rates and demand charges work, why they reward different behavior than a flat rate, and how battery storage fits
Rates GuideWhat the extra line items on a utility bill beyond the base rate actually are, and why your effective rate can differ from the advertised on
Money GuideWhat to actually check in a solar quote beyond the bottom-line price, and specific red flags that suggest getting a second opinion.
EV GuideWhat V2H (vehicle-to-home) and V2G (vehicle-to-grid) technology actually do, which vehicles support it, and what it means for home backup po
BasicsA plain-English explanation of watts, amps, and volts, how they relate through Ohm's Law, and why it matters for sizing solar, batteries, an
Sizing GuideHow weather forecasting integrates with solar production expectations, battery management, and planning around cloudy stretches.
Sizing GuideBeyond the warranty page — what genuinely varies between solar panel manufacturers, and which differences are worth paying a premium for.
Rates GuideWhat genuinely varies between electric utilities — rate structure, deregulated supplier options, and how to check what applies to your accou
Energy GuideA breakdown of what common household appliances actually cost per use and per year — fridges, dryers, water heaters, AC, and the surprising
Money GuideWhether solar net metering credits and agreements transfer to a new owner when you sell, and what to know before moving out of a solar home.
Sizing GuideHow solar panel recycling actually works, what percentage of materials can be recovered, and what to know before your system reaches 25+ yea
Sizing GuideWhat self-consumption rate measures in a solar system, why it matters more in some rate structures than others, and how to improve it.
HVAC GuideWhy HVAC sizing, thermostat setbacks, and heat pump efficiency matter more than most people think for your seasonal energy bill.
Backup Power GuideHow to size a backup generator correctly — why square footage is only a starting point, and why surge watts (not running watts) usually deci
Storage GuideHow to decide what to include on a backup battery's essential circuit list, common mistakes, and why more circuits isn't automatically bette
Storage GuideThe real trade-offs between sizing backup power for your entire home versus just essential circuits, and how to decide which fits your situa
Off-Grid GuideA practical checklist for preparing an off-grid cabin's solar, battery, and generator system for winter, especially for infrequently-visited
Technical GuideHow to pick the right wire gauge for a solar or battery system, why voltage drop matters more than most DIY guides admit, and where derating