GTP Solar insights
Useful context for solar procurement teams.
Notes for installers, EPCs, contractors and distributors planning residential, commercial and specialized solar equipment purchases.
- Project-matched selectionEquipment, quantities and interfaces reviewed with your team
- U.S. warehouse inventoryDirect delivery to your specified U.S. location
- Documentation supportCertification documents for the selected equipment
Share your project location, quantities and target schedule — we confirm availability and a tailored quotation.
Procurement perspectives
Clear information to help project teams prepare a more complete equipment enquiry.
A better solar equipment brief starts with the application.
A short, well-prepared brief helps confirm product fit, available documentation, delivery options and the right scope for a quotation.
- Describe the application and site conditions.
- Share capacity, voltage and product requirements.
- Confirm quantities, destination and target schedule.
Planning around U.S. stock
Domestic inventory can simplify fulfilment when suitable products are available. Availability, quantities and delivery arrangements should be confirmed for every order.
Supply support and local construction
Equipment selection, documentation and supply coordination can support a project, and inside our California service area our own licensed crew can carry out the installation as well.
Making equipment interfaces clearer
Modules, inverters, storage and electrical equipment need to work together at the required voltage, capacity and site conditions.
Latest articles
Practical guides for teams specifying and buying solar equipment.
Equipment Guides
Ammonia Corrosion on Solar Equipment: Farm Sites
Why a salt spray result does not answer an agricultural site, what ammonia attacks first, and the coating, fastener and enclosure items to specify.
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Equipment Guides
Solar Module Hot Spots: Causes, Detection and Claims
Why a small shadow costs more than its area, how hot spots are actually found, and the distinction that decides whether a claim is a product claim at all.
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Off-Grid & Telecom Power
Microgrid Controller: What It Does and How to Spec One
Grid-forming versus grid-following, the four operating modes, why the transition is where projects fail, and the eight items to settle before ordering.
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Equipment Guides
Solar Array Grounding and Bonding: What to Specify
Equipment grounding and bonding are two different jobs, why surge protection fails without the earth path beneath it, and what belongs in the specification.
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Commercial & Industrial Solar
Solar O&M Contract: What to Define Before You Sign
Response versus resolution time, how availability is counted, who owns the spares and the data, and the handover clause most contracts leave out entirely.
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Procurement & Compliance
Incoterms for Solar Equipment Orders: How to Choose
What a trade term actually decides about risk, cost and customs, why EXW and DDP cause trouble, and the items to settle before the order goes out.
Read article →Explore the complete article library33 more equipment, application and procurement guides
Procurement & Compliance
Letter of Credit for Solar Equipment: What to Specify
Why banks deal in documents rather than goods, where solar equipment orders run into discrepancies, and the fields to settle before you instruct a credit.
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Equipment Guides
Solar Module PID: Causes, Testing and Specification
What PID is, why it shows up as a gradient along the string, how PID resistance is tested rather than claimed, and what belongs in the specification.
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Commercial & Industrial Solar
How to Calculate LCOE for Commercial Solar + Storage
Which inputs belong in a commercial solar LCOE calculation, which get left out, and why a figure without a stated discount rate cannot be compared.
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Off-Grid & Telecom Power
Solar + Generator Hybrid: Sizing and Integration Guide
How to size a solar + generator hybrid: generator minimum load, motor inrush, battery autonomy and SoC setpoints. Checks to run before you request a quote.
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Equipment Guides
Solar DC/AC Ratio: How Much Oversizing Actually Pays
How to pick a DC/AC ratio for a solar plant: which range fits each site type, what moves it up or down, and how to check the number a supplier gives you.
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Procurement & Compliance
How Much Solar Equipment Fits in a 40HQ Container
40HQ dimensions, payload limits and loading quantities for solar modules, inverters, batteries and racking, plus which of the two limits binds first.
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Equipment Guides
Coastal Solar Mounting: Salt Spray and Coatings
What a salt spray test does and does not prove, where coated mounting structure actually fails, and how to specify coastal corrosion resistance in writing.
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Equipment Guides
Solar Rapid Shutdown: What US Projects Need
Rapid shutdown explained for solar installers and EPCs: the array boundary, module-level versus array-level control, and the four questions to settle first.
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Procurement & Compliance
Solar Supplier Audit: Factory and Inspection
How to qualify a solar equipment supplier: what a factory audit looks at, which inspection catches what, and how to check a listing is current and in scope.
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Commercial & Industrial Solar
Commercial Roof Solar: Roof Life and Warranty
Check roof life, waterproofing and roof warranty before a commercial array goes on. What to confirm in writing, and what usually voids coverage.
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Commercial & Industrial Solar · Equipment Guides
Solar Mounting Load Calculation
Procurement guide7 min readGTP SolarThe number that governs your racking is almost never the regional wind speed. It is which roof zone or which array row the equip…
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Commercial & Industrial Solar · Equipment Guides
Solar Plant Operations and Maintenance
Procurement guide6 min readGTP SolarOperations and maintenance is usually specified after handover, which is the wrong end of the project. The inspection intervals,…
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Commercial & Industrial Solar · Equipment Guides
Solar Inverter Sizing Guide
Procurement guide6 min readGTP SolarInverter sizing looks like a simple division - array kilowatts divided by something - and it is not. Two arrays of the same rati…
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Commercial & Industrial Solar · Equipment Guides
Solar Mounting Structures: How to Specify the Right System
How to choose a solar mounting system: roof type and attachment, ballast vs penetration, ground foundations, ASCE 7 loads, coating class, tilt and spacing.
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Commercial & Industrial Solar · Procurement & Compliance
Battery Storage Fire Safety and Code Compliance: The Submittal Checklist
What a US battery storage submittal needs: UL 9540 and UL 9540A, NFPA 855 separation, siting rules, detection and suppression, and where review fails.
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Equipment Guides · Procurement & Compliance
Solar Module Warranty: What It Covers and How Claims Work
How module warranties actually work: product vs performance cover, what voids a claim, how output is measured, and the evidence pack that gets a claim paid.
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Equipment Guides · Procurement & Compliance
Why Solar Equipment Prices Vary: What Actually Moves the Quote
What drives solar equipment pricing in 2026: module price bands, power bins, BOS and installation, storage cell costs, quantity tiers and compliance.
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Commercial & Industrial Solar · Equipment Guides
LV Switchgear: How to Specify a Board That Passes Inspection
How to specify LV switchgear: rated current, short-circuit rating, form of separation, protection discrimination, IP rating and IEC 61439 type testing.
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Commercial & Industrial Solar · Equipment Guides
Distribution Transformers: How to Specify One Correctly
How to read a transformer nameplate: rating, vector group, impedance, losses, cooling and the IEC vs ANSI choice that decides the test report.
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Commercial & Industrial Solar · Equipment Guides
Residential Solar + Battery: What Installers Should Specify
Residential storage is sold on backup and bought on self-consumption. Getting the specification right means designing for the second and explaining the first.
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Commercial & Industrial Solar · Equipment Guides
Solar and Storage for EV Charging Sites: What to Specify
On an EV charging site, the grid connection is usually the constraint, not the chargers. Here is what to specify before the utility quote arrives.
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Equipment Guides
Solar Plant Underperformance: A Diagnostic Sequence
Before assuming a fault, establish whether the plant is actually underperforming. Then work the causes in the order that finds them fastest.
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Commercial & Industrial Solar · Procurement & Compliance
Commercial Solar Payback: How to Model It Honestly
A payback figure is an output of a model, not a fact about a system. Here is how to build the model so the number means something.
Read article →Procurement & Compliance
FEOC Sourcing Rules: What US Solar Buyers Must Document
From 2026, equipment sourcing affects federal tax credit eligibility. Here is what US buyers should require from suppliers before issuing a PO.
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TOPCon vs PERC vs HJT: What B2B Buyers Should Specify
Module efficiency is the least useful number on the datasheet. Here is what actually separates TOPCon, HJT and PERC in 2026.
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Equipment Guides · Procurement & Compliance
Balance of System: The B2B Equipment Buying Guide
Modules and inverters get the attention; balance of system is where budgets break. A practical BOS guide for commercial projects.
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Equipment Guides · Procurement & Compliance
Solar Project Commissioning: What to Check Before Sign-Off
Most commissioning delays trace back to the week the container arrived. The sequence EPC teams should run before sign-off.
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Equipment Guides
Solar Inverters and Grid Connection: A B2B Checklist
The inverter is the component most likely to be wrong on a first specification. Here is what to confirm before grid-connected equipment is ordered.
Read article →Commercial & Industrial Solar · Equipment Guides
Battery Energy Storage: How B2B Buyers Should Specify a BESS
Two batteries with the same kWh rating can behave nothing alike. This is the specification checklist B2B buyers should send before comparing storage quotations.
Read article →Procurement & Compliance
What to Check Before Importing Solar Equipment into the US
Most import problems are documentation problems. What B2B buyers should confirm before solar and battery equipment leaves the factory.
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Solar Modules: What B2B Buyers Should Check Before Ordering
Module datasheets are easy to skim and easy to misread. The checklist B2B buyers should run before committing to a PV module order.
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Equipment Guides · Off-Grid & Telecom Power
Off-Grid Solar for Telecom Sites: What Remote Operators Actually Need
Remote sites fail for mundane reasons - undersized autonomy, wrong enclosure rating, no service margin. A practical equipment checklist for off-grid and telecom power.
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Commercial & Industrial Solar · Equipment Guides
How to Size a Commercial Solar + Battery System for Your Facility
Sizing a commercial system starts with the load, not the roof. This guide walks through the sequence we use before putting a B2B equipment list together.
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