[RE-wrenches] AC Coupling different brands

[Jay Peltz]

Hi Lars

I'm curious what you found those efficiency differences to be?

And how are you measuring inverter charging efficiency in the bi directional mode

Thanks

Jay

Peltz power



Sent from my iPhone

On May 28, 2013, at 10:53 AM, "lars Ortegren" <lars at cal-solar.com> wrote:

> We have done a number of off grid AC coupling projects over the last eight
> years. We have found they are successful with anything that comes close to a
> true sign wave, including some of the old Trace inverters. I would be
> careful to not come too close to the wattage of the source inverter, and
> keep in mind that your battery charging is only one stage (bulk), and might
> not be the best choice without another charging source (i.e. the grid, or a
> semi regular generator). I can't say it makes a lot of sense, but when we
> have tested grid tied inverters and charge controllers side by side, the GT
> inverters produce significantly more than any CC's on the market.. Any more,
> I think that it is a better design to have the larger array tied to a GT
> inverter, and a small array tied to a charge controller for absorb and float
> charging...Just sayin.
> 
> Lars Ortegren
> Director of Operations
> California Solar Electric Company
> 10141 Evening Star Drive, Suite 6
> Grass Valley, CA 95945
> http://www.californiasolarco.com/
> 
> Phone : (530)274-3671
> Fax: (530)274-7518
> 
>