25-Year Cumulative Savings Timeline
Investment Outlook
Based on your figures, a Solar & Battery system will offer highly favourable financial returns. Grid imports are minimised, reducing your ongoing utility costs drastically.
Detailed Configuration Comparison
| Option | Investment Cost | Annual Savings | Payback Period | 25y Net Profit (NPV) | Verdict |
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Optimising Self-Consumption
Adding storage yields higher returns because it captures solar energy produced during peak hours, saving it to offset expensive utility grid rates rather than exporting it back to the grid for lower feed-in credits.
🔍 Solar & Battery Comparison Tool & FAQ Guide
Welcome to solarcalc, the ultimate solar and battery comparison tool designed to help homeowners model their green energy investments with mathematical precision. Whether you are comparing solar panels only, evaluating high-performance home solar batteries, or conducting an all-in-one financial payback assessment, our calculator provides instant real-time projection curves.
Why use a solar & battery comparison calculator?
Investing in solar panels is a fantastic way to slash electric bills, but choosing the right system size and deciding whether to add home batteries (energy storage batteries) can be complex. This tool allows you to perform deep financial simulations by entering local unit import rates, smart export feed-in tariffs (like Octopus Outgoing), and battery storage capacity to see how quickly your system pays for itself.
How is solar payback period calculated?
Payback is calculated by dividing your total installed capital cost (panels plus battery storage) by your annual net savings. Net savings are driven by self-consumed solar energy (avoiding peak import costs) plus export credits received from selling surplus solar electricity back to the grid. In 2026, smart variable export rates make solar systems pay back faster than ever before.
What are MCE savings and NEM 3.0 battery storage offsets?
MCE savings (Marin Clean Energy) and NEM 3.0 rules in California mean that simple export rates are low, while peak evening import rates are extremely high. A battery calculator helps you model how storing power during sunny midday hours and discharging it during peak 4-9 PM slots avoids buying expensive utility electricity, yielding the maximum possible dollar savings.
Standard UK MCS yields & self-consumption tables
The UK Microgeneration Certification Scheme (MCS) establishes strict standard coefficients to forecast solar yields based on orientation, pitch, and shading factors. By switching on "UK MCS Standards" in our advanced adjustments, you unlock instant compliant self-consumption modeling based on official domestic occupancy archetypes.
🙋 Frequently Asked Questions (FAQ)
Is this solar and battery calculator free and independent?
Yes, solarcalc is 100% free and fully independent. We are completely unaffiliated with any energy suppliers, solar panel installers, or home battery manufacturers, ensuring unbiased mathematical comparisons of installer quotes and loans.
Should I get solar panels only, or add a battery storage system?
While solar panels offer excellent daytime savings, adding a battery calculator helps you evaluate the benefits of energy storage. Batteries capture surplus solar electricity to power your home during the night, shielding you from expensive peak grid utility import tariffs.
How does MCE savings impact my home energy return on investment?
MCE customers benefit from clean energy and specialized variable rates. Under new net billing programs, maximizing your self-consumption via home batteries yields high MCE savings because it minimizes premium-tier import charges from local grids.
Can I use this as a battery calculator for off-grid setup?
This calculator is designed for grid-tied domestic properties. It models import rates, feed-in smart export credits, solar arrays, home batteries, quotes, and loans to determine grid independence and financial return timelines.
Our comparison tool also supports advanced multi-loan financing evaluation and side-by-side installer quote comparisons. By adjusting parameters such as energy inflation and bond opportunity costs, you can discover which quote offers the maximum 25-Year Net Present Value (NPV). Optimise your domestic energy independence today!
© 2026 solarcalc. Built independently as a hobby project in spare time. Completely unaffiliated with any energy providers, solar panel manufacturers, or battery companies.