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most larger inverters have built in chargers so the size of your existing charger is irrelevant.
true sine is a little more expensive than modified and seem to become more popular. I have 4 year old Xantrex Freedom 30 which is modifed sine and it works fine. Some items (fluo lights, fans, microwave) are a little noisy on inverter but everything else has been fine so far. Some sensitive electronics (high end amplifiers) and tool chargers are some of the things known not to like MSW. Digital clocks dont' work either.
i recently installed a Magnum 4000 on a boat i captain, it was about $500 more than the freedom 3000, worth it.
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