{"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":"2026-05-18T15:51:28","modified_gmt":"2026-05-18T13:51:28","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
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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
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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
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Is there a standard?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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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
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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

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More tips & tricks<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Home \/ Page Is there a standard? 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 of how many hours you […]<\/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_robots_primary_cat":"","_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":"","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":14,"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/pages\/1213\/revisions"}],"predecessor-version":[{"id":15678,"href":"https:\/\/sutars.com\/en\/wp-json\/wp\/v2\/pages\/1213\/revisions\/15678"}],"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}]}}