On Wed, 10 Jul 2002, Richards, Justin P wrote:

>What I had in mind was to use a separate solar panel and small inexpensive
>regulator  for each battery.  This eliminates the dc/dc upconverter.  This
>sounds expensive using 20 regulators, 20 solar panels and 20 batteries (at
>12v),  but the regulators are all low power and second hand 33 watt panels
>are cheap.  Smaller batteries are easier to handle and if one fails it is
>not a huge loss.
>
>I have spoken to people transporting big 2v cells and the problems they
>have.
>
>Peter what is a "sine former (using magic sine etc)".  That is the last
>piece of the system.

A chopper that produces something resembling a sine wave after a filter.
Usually it is implemented as a H bridge with thyristors or bipolars or
FETs or IGBTs and controlled by a small CPU, like a PIC.

With your system you also have the option to implement a power buck
regulator followed by a H bridge to change output phase every half period.
That would make a nice clean output. A 5kW buck regulator at 300V is not
so hard to make. Don't expect this to be a picninc though, whichever
solution you pick, you are looking at months of work, assuming you have a
life. There is also the solution of running 120V DC in the house and have
120V AC (at low power) only for appliances that need it.  For example you
can run all your lights on DC without trouble. HOWEVER your local
electrical code has the last word on this.

Peter

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