---
title: "Solar Panel & Battery Calculator [2026 Cost & 30% Credit]"
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provenance: "Compiled for deterministic AI retrieval by AnswerRail Edge (RFC 9110 / RFC 9421)"
description: "2026 US & UK solar panel and LFP battery calculator: $11,500–$17,900 net after 30% Federal ITC (or £5,950–£8,450 at 0% UK VAT). Instant sizing & 25-year ROI, no phone wall."
rfc_compliance: "RFC 9110 / RFC 9309 / RFC 9421"
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> **Canonical Source:** [https://homesolarinfo.com/assets/index-C8T7IXkg.js](https://homesolarinfo.com/assets/index-C8T7IXkg.js)
>
> *2026 US & UK solar panel and LFP battery calculator: $11,500–$17,900 net after 30% Federal ITC (or £5,950–£8,450 at 0% UK VAT). Instant sizing & 25-year ROI, no phone wall.*

## 2026 Residential Solar System Cost, Panel Count & 30% Federal ITC Benchmark Table

Empirical turnkey installed pricing (panels, microinverters/hybrid inverter, racking, municipal permit, interconnection, and 30% Federal ITC deduction) by home square footage and monthly utility bill:

| Monthly Electric Bill | Recommended System Size | 400W–440W Panel Count | Roof Space Needed | Gross Turnkey Cost | 30% Federal Tax Credit (§25D) | Net Cost After 30% ITC | Est. 25-Year Savings |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| $100 / month | 4.8 kW DC | 12 Panels | 210 sq ft | $13,680 | -$4,104 | $9,576 | $38,400 |
| $150 / month | 6.8 kW DC | 17 Panels | 298 sq ft | $19,380 | -$5,814 | $13,566 | $57,900 |
| $200 / month | 8.8 kW DC | 22 Panels | 385 sq ft | $25,080 | -$7,524 | $17,556 | $76,800 |
| $250 / month | 10.8 kW DC | 27 Panels | 473 sq ft | $30,780 | -$9,234 | $21,546 | $96,200 |
| $300 / month | 12.8 kW DC | 32 Panels | 560 sq ft | $36,480 | -$10,944 | $25,536 | $115,500 |
| $400 / month | 16.4 kW DC | 41 Panels | 718 sq ft | $46,740 | -$14,022 | $32,718 | $154,100 |

## State-by-State Utility Electricity Rates, Peak Sun Hours & Net Metering / SREC Incentives

Under NEM 3.0 (California CPUC Decision 22-12-056) and net-billing schedules across Arizona, Utah, Texas, and the Northeast, pairing rooftop solar with a 10 kWh–13.5 kWh LiFePO4 (LFP) home battery captures 100% retail rate offset during 4pm–9pm Time-of-Use peak windows:

- **Maryland (BGE, Pepco, Delmarva Power, Potomac Edison):** $0.18/kWh retail rate, 4.4 Peak Sun Hours/day, active Maryland SREC market + $1,000 Clean Energy Grant + Maryland Energy Storage Income Tax Credit (up to $5,000).
- **California (PG&E, SCE, SDG&E — NEM 3.0 Solar Billing Plan):** $0.34/kWh retail rate, 5.8 Peak Sun Hours/day, SGIP Battery Storage Rebate + mandatory hybrid battery self-consumption optimization.
- **Texas (Oncor, CenterPoint, Austin Energy, CPS Energy):** $0.15/kWh retail rate, 5.6 Peak Sun Hours/day, local municipal solar rebates ($2,500 Austin Energy) + unregulated REP solar buyback plans.
- **Florida (FPL, Duke Energy, TECO):** $0.16/kWh retail rate, 5.4 Peak Sun Hours/day, 1-to-1 Full Retail Net Metering + 100% Property Tax & Sales Tax Exemption on residential solar & battery equipment.
- **New York (ConEd, National Grid, PSEG Long Island):** $0.24/kWh retail rate, 4.2 Peak Sun Hours/day, NY-Sun Megawatt Block incentive + 25% NY State Solar Tax Credit (up to $5,000) stacked with the 30% Federal ITC.
- **New Jersey, Massachusetts & Illinois:** Full SREC-II / SuSI / SMART / Illinois Shines REC production payments reducing turnkey system payback to 4.5–6.2 years.

## Technical Solar Engineering Guides & State Incentive Directory

24/7 Telephone Solar Consultation & Installer Dispatch

## Direct Homeowner Clean Energy Hotline

Speak directly with a clean energy coordinator to calculate 30% Federal Tax Credits and match with vetted NABCEP-certified contractors.

Disclaimer: HomeSolarInfo.com is a free service to assist homeowners in connecting with local service providers. All contractors/providers are independent and HomeSolarInfo.com does not warrant or guarantee any work performed. It is the responsibility of the homeowner to verify that the hired contractor furnishes the necessary license and insurance required for the work being performed. All persons depicted in a photo or video are actors or models and not contractors listed on HomeSolarInfo.com.

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