Hello Len,

I don't think the advantages of pure sine wave inverters
really fall into the category of efficiency as you've
suggested. Some appliances will not work at all, or will
work poorly, with less than pure sine waves. Whether to pay
a price premium for a pure sine wave inverter usually
depends on that consideration, rather than on anticipated
savings in cost or energy, which are not likely to be
noticeable.

There are also modified sine wave inverters that provide
"purity" between a pure sine wave and a square wave. These
may be a better buy, but your choice should be dictated by
the appliances you intend to operate.

Here's a web site you can start with. Do a Google search on
"pure sine wave inverter advantages" to learn more.

http://www.q3wholesale.com/Resources-sinewave-guide.htm
Sine Wave Guide

Good luck.

Chuck







Len Krauss wrote:
From what I gather a microwave oven operates much more efficiently (less
power, faster cooking) running on pure sine wave. I understand there are
also some other types devices that either require or benefit from pure sine
wave power. In view of the premium price of pure sine wave inverters, I was
wondering if it's worth it or even necessary. For instance, if it used say
25% less battery capacity that would be important. Can anyone comment on
this and other considerations for selecting a pure vs. modified since wave
inverter for onboard use?
Thanks,
Len Krauss