Pvwatts.nrel.gov - SEO Checker

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Overview of the SEO Check
Meta information
73% 
Page quality
42% 
Page structure
79% 
Link structure
25% 
Server
65% 
External factors
100% 
SEO Score
Response time
1.06 s
File size
27.90 kB
Words
193
Media files
4
Number of links
1 internal / 8 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
PVWatts Calculator
The page title is too short. (174 pixels of 580 max pixel length) Optimize title
There are no duplicate words in the title
Meta description
(Critically important)
Estimates the energy production and cost of energy of grid-connected photovoltaic (PV) energy systems throughout the world. It allows homeowners, small building owners, installers and manufacturers to easily develop estimates of the performance of potential PV installations
The meta description is too long: 1698 pixels from max. 1000 pixels. Optimize description
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
No canonical link is specified.
Language
(Somewhat important)
Language detected in text: en
Language defined in HTML: en
Server location: United States of America
The following language is defined by HTML: en
Alternate/Hreflang Links
(Somewhat important)
There are no alternate links specified on this page.
Other meta tags
(Somewhat important)
There is no rel next meta tag on this page.
There is no rel prev meta tag on this page.
Domain
(Somewhat important)
This page is hosted on a subdomain. Use a top level domain for better SEO results.
The domain does not contain non-latin characters.
Page URL
(Somewhat important)
No parameters were found in the URL.
No session ID was found in the URL.
The URL does not have too many subdirectories.
Charset encoding
(Somewhat important)
The charset encoding (UTF-8) is set correctly.
Doctype
(Nice to have)
The doctype HTML 5 is set correctly.
The doctype is placed at first in the HTML code.
Favicon
(Nice to have)
The favicon is linked correctly.

Meta tags

NameValue
viewportwidth=device-width, initial-scale=1
descriptionEstimates the energy production and cost of energy of grid-connected photovoltaic (PV) energy systems throughout the world. It allows homeowners, small building owners, installers and manufacturers to easily develop estimates of the performance of potential PV installations
titlePVWatts
keywordsPVWatts, solar panels performance estimates
referrerorigin-when-cross-origin
langen
twitter:cardsummary_large_image
twitter:site@pvwatts
twitter:creator@nrel
twitter:titlePVWatts - NREL
twitter:descriptionEstimates the energy production and cost of energy of grid-connected photovoltaic (PV) energy systems throughout the world
twitter:image:src//pvwatts.nrel.gov/img/pvwatts_twitter_banner.jpg
twitter:image:altEstimates the energy production and cost of energy of grid-connected photovoltaic (PV) energy systems throughout the world
X-UA-CompatibleIE=edge
charsetutf-8

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Page quality

Content
(Critically important)
There are only 193 words on this page. Use at least 250 words to provide useful information.
17.6% of the text are stop words.
The page contains a listing, which indicates a good text layout.
4 paragraphs were found on this page.
No placeholders texts or images were found.
There are no duplicates on the site.
The average number of words per sentence of 14.57 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No Apple touch icon is specified.
This page loads 7 JavaScript files. This may affect the load time negatively.
A viewport "width=device-width, initial-scale=1" is provided.
Bold and strong tags
(Somewhat important)
The usage of strong and bold tags is perfect. We recommend the use of up to 6 tags for this page.
Image SEO
(Somewhat important)
3 images have no alt attribute. The content of alt attributes is used by search engines.
Social Networks
(Nice to have)
This page is optimized perfectly for social networks.
Additional markup
(Nice to have)
No additional page markup was found.
HTTPS
(Somewhat important)
This website uses HTTPS to protect privacy and integrity of the exchanged data.
All included files are also transferred via HTTPS.

Media list

URLAlt attributeTitle
https://pvwatts.nrel.gov/img/header_app.gifNational Renewable Energy Laboratory
https://pvwatts.nrel.gov/img/nonlogo.pngNo alt attribute provided
https://pvwatts.nrel.gov/img/home_bg.jpgNo alt attribute provided
/img/shadow_right.jpgNo alt attribute provided

Page structure

H1 heading
(Critically important)
There is no H1 heading specified.
Headings
(Important)
The structure of headings is missing one or more levels. Do not skip heading levels.

Heading structure

Heading levelContent
H2 NREL's PVWatts® Calculator
This page seems to be an entry page, because only very few links were found.
Every linktext is unique.
None of the anchor texts is too long.
All internal links are not using dynamic parameters.
There are 8 external links on this page.

Found links on this page

LinkAttributesAnchor text
https://www.google.com/intl/en...External Subdomain Google Chrome
https://www.mozilla.org/en-US/...External Subdomain Mozilla Firefox
/index.phpPVWatts® Calculator
https://www.nrel.gov/External Subdomain IMG-ALT National Renewable Energy Laboratory
https://twitter.com/PVWattsExternal Follow @PVWattsatNREL
https://www.nrel.gov/security....External Subdomain Security & Privacy
https://www.nrel.gov/disclaime...External Subdomain Disclaimer
https://www.energy.gov/vulnera...New window External Subdomain Vulnerability Disclosure Program
A-TITLE DOE Vulnerability Disclosure Policy
https://www.nrel.gov/External Subdomain NREL Home

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://pvwatts.nrel.gov/"
HTTP header
(Important)
No X-Powered HTTP header is sent.
The web server transmits the web page (HTML) in compressed form.
Performance
(Somewhat important)
The page response time is slow (1.06 seconds). The response time should be less than 0.4 seconds. Slow websites are bad for search engine bots and also result in bad user experience.
This page loads 8 CSS files. This may affect the page load time negatively.
This page loads 7 JavaScript files. This may affect the load time negatively.
The file size of the HTML document is fine (28 kB).

HTTP Response Header

NameValue
dateTue, 15 Apr 2025 03:26:41 GMT
content-typetext/html; charset=UTF-8
content-length7239
connectionkeep-alive
set-cookie178 Characters
x-content-type-optionsnosniff
x-frame-optionssameorigin
x-xss-protection1; mode=block
strict-transport-securitymax-age=31536000; preload
x-ua-compatibleIE=edge
cache-controlno-store, no-cache, must-revalidate, post-check=0, pre-check=0
expiresThu, 19 Nov 1981 08:00:00 GMT
pragmano-cache
last-modifiedThu, 13 Mar 2025 16:14:06 GMT
varyAccept-Encoding
content-encodinggzip
content-security-policyobject-src 'none'; frame-ancestors 'none'
expect-ctmax-age=0
referrer-policystrict-origin-when-cross-origin
statuscode200
http_versionHTTP/1.1

External factors

This website has excellent links from other websites.
This page has backlinks from 1,438 referring domains.
This page has 14,885 backlinks.
This page has backlinks from 1,150 different ip addresses.

Links from Wikipedia

No links from Wikipedia were found.

Robots.txt

No valid Robots.txt file was found.

Similar sites

Search preview

pvwatts.nrel.gov
PVWatts Calculator
Estimates the energy production and cost of energy of grid-connected photovoltaic (PV) energy systems throughout the world. It allows homeowners, small building owners, installers and manufacturers to easily develop estimates of the performance of potential PV installations

Most important keywords

Following keywords were found. You can check the keyword optimization of this page for each keyword.

KeywordResultRecheck
PVWatts62%Check
potential PV60%Check
PVWatts Calculator56%Check
Calculator50%Check
NREL50%Check
Energy48%Check
Energy Systems47%Check
energy production47%Check
SYSTEM46%Check
Estimates46%Check
Show more keywords and terms

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