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Leisure battery Tests
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<blockquote data-quote="Radventures" data-source="post: 464039" data-attributes="member: 30173"><p>Hi there, I'm hoping somebody here can help me out, as I'm struggling with the maths myself. My incoherence scribbles have revealed nothing! I have a leisure battery, which I discovered had a faulty voltmeter attached and this is what I was using to make sure I didn't run it down to low. I wanted to check how healthy the battery is now as a result of this so have run some tests.</p><p></p><p>I ran a 100 W bulb using an inverter for one hour. The voltage dropped from 12.81 V to 12.66 V (measured several hours later a I found it took a long time to settle). The battery is 110 AH. This one: <a href="https://www.tayna.co.uk/leisure-batteries/numax/xv31mf/" target="_blank">https://www.tayna.co.uk/leisure-batteries/numax/xv31mf/</a></p><p></p><p>I also tested its ability to hold charge. After a full charge from the alternator it read 12.93 V. I measured it again every day for four days and it dropped 1st to 12.86 V then to 12.83 V then to 12.81 V, which it held on the fourth day.</p><p></p><p>As a separate test roughly over a week it has dropped from 12.66 V to 12.63 V.</p><p></p><p>It doesn't seem completely knackered, but I have no idea if it's holding 110 AH worth of charge. Thanks for taking a look!</p></blockquote><p></p>
[QUOTE="Radventures, post: 464039, member: 30173"] Hi there, I'm hoping somebody here can help me out, as I'm struggling with the maths myself. My incoherence scribbles have revealed nothing! I have a leisure battery, which I discovered had a faulty voltmeter attached and this is what I was using to make sure I didn't run it down to low. I wanted to check how healthy the battery is now as a result of this so have run some tests. I ran a 100 W bulb using an inverter for one hour. The voltage dropped from 12.81 V to 12.66 V (measured several hours later a I found it took a long time to settle). The battery is 110 AH. This one: [URL="https://www.tayna.co.uk/leisure-batteries/numax/xv31mf/"]https://www.tayna.co.uk/leisure-batteries/numax/xv31mf/[/URL] I also tested its ability to hold charge. After a full charge from the alternator it read 12.93 V. I measured it again every day for four days and it dropped 1st to 12.86 V then to 12.83 V then to 12.81 V, which it held on the fourth day. As a separate test roughly over a week it has dropped from 12.66 V to 12.63 V. It doesn't seem completely knackered, but I have no idea if it's holding 110 AH worth of charge. Thanks for taking a look! [/QUOTE]
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