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Message: <blockquote data-quote="GeorgeTelford" data-source="post: 36070">HiIf you use a 1000 Watt invertor to power a 50 Watt TV it will use almost exactly the same power as a 150 Watt invertor powering the same item.....Having said that there are a few advantages to using a smaller unit, it avoids temptation to power everything, most 150 Invertors are fan free/fan only when needed which means quieter.Some (but not all) combined units do not like Quasi sine wave invertors, this is to do with how the combined power supply works, but in general nearly all new units use switch mode power supplies which should be OK.Personally, I would relegate an 85 ah battery to the bin and have at least 2X 110 Ah batteries.</blockquote>