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Spec it, compare it, then quote it

The comparison tools, datasheets and technical briefs your crew and your sales team both end up needing. Every table is built from live catalog data — part numbers, stock and list price included.

Comparison tool

Compare batteries

The three whole-home storage lines that come up in almost every residential bid, plus the AC-coupled option for retrofits.

All energy storage →
How to read this. Usable capacity, continuous output and round-trip efficiency vary by configuration and firmware — pull them from the linked datasheet rather than a comparison chart. What this table settles is the part number, what it costs, and whether it is on the shelf today.
Comparison tool

Compare hybrid inverters

Whole-home and essentials-load hybrids from Sol-Ark, EG4, Fortress Power and Sigenergy.

All inverters →
Comparison tool

Compare solar modules

445W to 590W residential and commercial modules, including the FEOC-compliant SEG Yukon line for domestic-content bids.

All solar panels →
Category guide

EV charging & V2X

Bidirectional DC charging is the fastest-moving line on the shelf. The Sigenergy SigenStor EVDC pairs with the SigenStor stack for vehicle-to-home backup in CCS1 and NACS.

All EV charging →

Vehicle compatibility changes with every OEM firmware release — check the current tested-vehicle list before you promise V2H on a bid.

Category guide

Energy management & load control

Gateways, mid-panels and smart circuits — the parts that decide what actually stays on when the grid drops.

All energy management →
How to Solar

From takeoff to commissioning

The working guides we send new dealers — written for crews, not homeowners.

Sizing a whole-home system

Load list to inverter class to battery count, with the pass-through math that decides whether you need a mid-panel.

Read the guide →

Rapid shutdown, done right

Where RSD lives in the string, what the AHJ looks for, and the Tigo and APsmart part numbers that pass first inspection.

Read the guide →

Racking takeoff by roof type

Shingle, standing seam and ground mount — the Sunmodo hardware count per array, with skirt and flashing options.

Read the guide →

Battery placement & clearances

Garage vs exterior wall, temperature derating, and the code clearances that decide the install day.

Read the guide →

Domestic content & FEOC

Which modules still carry the adder in 2026 and what documentation to attach to the bid.

Read the guide →

Freight, liftgates & damage claims

How to receive a pallet so a damage claim actually pays, and when to flag a residential delivery.

Read the guide →
Spec library

Datasheets, manuals & listings

Every stocked SKU has its datasheet, install manual, warranty statement and certification letter attached to the product page.

Browse the catalog →
News & technical briefs

What changed this quarter

Full archive →
EV & V2X·Brief

SigenStor V2X: the tested-compatible EV list

Storage·Brief

Pack-level fire safety in the SigenStack stress test

Storage·Comparison

FranklinWH vs EG4: which battery fits which job

Inverters·Comparison

Sol-Ark 12K vs 15K: where the extra headroom pays

Policy·Brief

Domestic content bonus 2026: qualifying modules

Market·Update

What is changing in 2026 for Texas solar

Article links point at the existing solwel.com blog — those URLs are preserved unchanged in the site map.

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