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Message: <blockquote data-quote="Heathen" data-source="post: 8754916" data-attributes="member: 680849">I've just bought an amplifier which states how much power it makes at a given voltage (13.4v). As this amp will be run from my second battery (max ~12.5v?), I'll never see the full potential of the amp, unless I run it directly from the alternator, right? If I'm only able to power the amp from this second battery, is there formula to work out how much power I can extract at a certain voltage?Also, the amp recommends 'at least 150Ah of battery power', and two 200 amp fuses.My second battery is 50Ah. Even if I only run my amp to half of it's potential, am I going to wreck the battery? Am I even going to reach half of the amp's potential?I'm not able to get a larger battery just yet, so alternatives are not an option at this stage. I have to work with what I have.</blockquote>

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