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<blockquote data-quote="Geoff1946" data-source="post: 531891" data-attributes="member: 28452"><p>I very much doubt that your fuses will be in parallel. That's just not done. They will be feeding two circuits which compliment each other to perform the inverter function.</p><p></p><p>Volts X Amps = Watts is valid for DC, but everything you do has losses. There are resistive losses in every connection, every length of cable, fuse, or connector. Inverter efficiency will be quoted for your device, but will vary with load. Also the battery voltage will drop quite quickly under heavy load. Every fraction of a volt lost to circuit resistance is significant when you only have 12 volts to start with.</p><p></p><p>Battery AH rating of a battery will be at a specified load which is likely much lower than your invertor will draw.</p><p></p><p>I f you want to run a tyre inflator from a car battery by far the best thing to do is buy a 12volt inflator.</p><p></p><p>Your car alternator will only produce its rated output when the engine is running at speed. I wouldn't have thought you would normally use it to feed an inverter.</p></blockquote><p></p>
[QUOTE="Geoff1946, post: 531891, member: 28452"] I very much doubt that your fuses will be in parallel. That's just not done. They will be feeding two circuits which compliment each other to perform the inverter function. Volts X Amps = Watts is valid for DC, but everything you do has losses. There are resistive losses in every connection, every length of cable, fuse, or connector. Inverter efficiency will be quoted for your device, but will vary with load. Also the battery voltage will drop quite quickly under heavy load. Every fraction of a volt lost to circuit resistance is significant when you only have 12 volts to start with. Battery AH rating of a battery will be at a specified load which is likely much lower than your invertor will draw. I f you want to run a tyre inflator from a car battery by far the best thing to do is buy a 12volt inflator. Your car alternator will only produce its rated output when the engine is running at speed. I wouldn't have thought you would normally use it to feed an inverter. [/QUOTE]
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