{"id":1213,"date":"2025-03-27T13:29:26","date_gmt":"2025-03-27T12:29:26","guid":{"rendered":"https:\/\/dev-site.se\/sutars.com\/?page_id=1213"},"modified":"2026-06-24T15:55:41","modified_gmt":"2026-06-24T13:55:41","slug":"how-charged-are-my-lead-acid-batteries","status":"publish","type":"page","link":"https:\/\/sutars.com\/en\/wired-inspired\/batteries\/how-charged-are-my-lead-acid-batteries\/","title":{"rendered":"How charged are my lead-acid batteries?"},"content":{"rendered":"\t\t
\n\t\t\t\t
\n\t\t\t\t\t
\n\t\t
\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t

How charged are my lead-acid batteries?<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t
Home<\/a> \/<\/span> Page<\/span><\/div>\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t

How to Interpret Battery Voltage and State of Charge<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t
The voltage tells you how charged your lead-acid batteries are, not how large your battery bank is. To find that out, you need to perform a load test<\/a>.<\/strong><\/div><\/div><\/div><\/div><\/div><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

The size of your battery bank is measured in ampere-hours (Ah). This is a measure of how many hours you can draw a certain number of amperes from your batteries. If you have a battery bank of 200 Ah, you can theoretically draw 20 A for 10 hours. (Which only works in theory, since lead-acid batteries fail if subjected to too many deep discharges.)<\/strong><\/p>

The table shows the voltage across the lead-acid batteries at different levels of discharge. The table applies to domestic batteries at rest or with very low consumption. A starter battery needs to rest for several hours after an engine start for the value to be reliable.<\/p>

When you draw more current, add about 0.2 V to the instrument\u2019s reading before comparison. That is, if your instrument shows 12.1 V under load, it should be read as 12.3 V.<\/p>

Note that the table is approximate, but after a while you will get to know your lead-acid batteries. A fuel gauge is not exact either, but it still provides peace of mind. If you have a battery monitor that uses current measurement to estimate the state of charge, you should still keep an eye on the voltage, since voltage never drifts over time.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"Skyllermarks\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
\n\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t

More tips & tricks<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Home \/ Page How to Interpret Battery Voltage and State of Charge The voltage tells you how charged your lead-acid batteries are, not how large your battery bank is. To find that out, you need to perform a load test. The size of your battery bank is measured in ampere-hours (Ah). This is a measure […]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":543,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_seopress_titles_title":"How charged are my lead-acid batteries? | Sutars AB","_seopress_titles_desc":"The size of your battery bank is measured in ampere-hours (Ah). It is a measure of how many hours you can consume a certain number of amps with your batteries. Read more about it!","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"both","_seopress_redirections_param":"","_seopress_redirections_type":301,"_seopress_analysis_target_kw":"","editor_notices":[],"footnotes":""},"Pagecategories":[60],"class_list":{"0":"post-1213","1":"page","2":"type-page","3":"status-publish","5":"Pagecategories-batterierna"},"acf":[],"meta_box":[],"_links":{"self":[{"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/pages\/1213","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/comments?post=1213"}],"version-history":[{"count":17,"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/pages\/1213\/revisions"}],"predecessor-version":[{"id":15915,"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/pages\/1213\/revisions\/15915"}],"up":[{"embeddable":true,"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/pages\/543"}],"wp:attachment":[{"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/media?parent=1213"}],"wp:term":[{"taxonomy":"Pagecategories","embeddable":true,"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/Pagecategories?post=1213"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}