Terms of use
These terms describe what this site offers and what it does not. They are written to be read, not to be scrolled past: the short version is that the calculators are arithmetic, the sources are named, and the decisions about your own wiring belong to a licensed person.
Quick answer
Use the site freely. The results are estimates built from the figures you enter and from published specifications, not professional electrical, legal or financial advice. Products are sold by third parties, and their current listing is the authority on what you are buying. Some links are Amazon affiliate links: as an Amazon Associate we earn from qualifying purchases. Nothing here is a warranty, and neither the site nor its editor accepts liability for a purchase or an installation made on the strength of a page.
What these terms cover
They cover your use of this website: the calculators, the data tables, the ranking pages and the written guides. By using any of it you accept them. If you do not, the site is still readable but you should not rely on the results.
They do not cover the shops and marketplaces the site links to. When you follow an affiliate link you leave this site, and the sale, the delivery, the warranty and the return are between you and that retailer under that retailer's own terms.
Nothing on the site creates a client relationship. Reading a page, running a calculator or sending a correction does not make this site your engineer, your contractor or your adviser.
The calculators are estimates, and the formulas are yours to check
Each calculator applies a published formula to the numbers you enter. The formula is printed next to the result, and the assumptions behind it are described in the surrounding text. That design is deliberate: the arithmetic should be reproducible by hand, and a result you cannot reproduce is a result you should not act on.
The weak point is always the input. A typical appliance figure from our tables may be wrong for your specific model by a wide margin, because compressors and heating elements vary between units. The label on your own appliance overrides anything on this site.
Estimates also carry a planning margin that is a choice rather than a fact. Depth of discharge, days of autonomy and system efficiency are set to common values, and the pages say which values they use so you can change them.
Not professional advice
Electrical work is regulated, and the rules differ by state, by city and by utility. Anything involving a panel, a breaker, a transfer switch, permanent wiring or a circuit at 240 V requires a licensed electrician and, in most places, a permit and an inspection. A page on this site may explain the limit a circuit has; it will not tell you your installation is safe or permitted.
Legal and regulatory questions are the same. Whether a specific system may be connected, and under what application, is decided by your authority having jurisdiction and your utility. The site states what it has verified and labels what it has not; this page is not legal advice, and regulations change, so check the current rule with your authority having jurisdiction before you act.
Nothing here is financial advice either. Payback figures are planning arithmetic on rates you supply, not a prediction about your bill, your tariff or the value of your property.
Products, prices and third parties
Products named on this site are sold by third parties. Capacities, outputs and certifications are taken from manufacturer material and dated; retailers change listings, bundles and model revisions without notice, so the current listing is the only authority on what is in the box today.
Prices are never printed here. A product link says Check current price and the figure lives on the retailer's page, because a static price would be wrong within a day and because the affiliate program requires live pricing.
Some links earn a commission, which never changes what you pay. The disclosure page lists which links those are and what the site will not do for a commission.
Our content, and what you may reuse
The written text, the data tables, the charts and the calculator code are published by Energy Sizing and remain its property. You may quote a short passage with a link back to the page it came from, and you may cite a figure with the source named.
You may not republish a table or a page in full, mirror the site, or present its calculations as your own. If you want to embed a calculator or use a data table in a product, ask first: contact@energysizing.com.
Third-party names, logos and trademarks belong to their owners and are used here only to identify a product.
| Topic | Covered here | Where it is decided instead |
|---|---|---|
| Calculator results | Estimates from your inputs and published formulas | Your own appliance labels and the installer's load calculation |
| Electrical safety and permits | Not covered | Licensed electrician, local building department, utility |
| Purchases and delivery | Not covered | The retailer's terms and its returns policy |
| Content reuse | Quotation with attribution; permission for the rest | Written approval from the editor |
Questions people ask
Are the calculator results accurate enough to buy from?
They are arithmetic on the figures you type in, and the formulas are printed so you can check them. Accuracy therefore depends on your inputs: a nameplate figure read off your own appliance beats any typical value in our tables.
Can I rely on this site for a permit or an inspection?
No. Permits, interconnection applications and inspections are decided by your local authority and your utility, on your specific installation. Nothing here is a substitute for the licensed person who signs off the work.
What happens if a specification changes after you publish it?
Manufacturers revise capacity and output between production runs, so a published figure can go stale. We correct it when we find it and record the change in the changelog; the retailer's current listing is always the authority on what is being sold today.
Can I reuse your tables or embed a calculator?
Ask first. Short quotations with a link back are fine. Republishing a table in full, or embedding a calculator without attribution, is not.
Do these terms change?
Yes, when the way the site works changes. The revision date at the top of this page moves with any change, and material changes are noted in the site changelog.
Liability, changes and contact
The site is provided as it is. No warranty is given that a page is complete, current or free of error, and no liability is accepted for loss arising from a purchase, an installation or a decision made on the strength of the material here. That includes a system that turns out to be the wrong size, and equipment that fails after it is bought.
Where a law does not allow a limit of this kind, that law applies and this paragraph does not reduce your rights under it.
These terms change when the way the site works changes. The date at the top of the page moves with every revision, and material changes are recorded in the changelog so the history stays visible.
Questions about these terms, corrections to a figure, or permission to reuse content: contact@energysizing.com. What is collected when you visit is described on the privacy page, and how numbers are produced is on the method page.
- Federal Trade Commission, Endorsement Guides — the disclosure rules referenced above.
- Amazon, Associates Program Operating Agreement — the pricing and linking rules this site follows. Read 2026-11-09.
- Federal Trade Commission, 16 CFR Part 255 — the regulation behind the guides. Read 2026-11-09.