"tony sayer" wrote in message
...
In article , The Natural Philosopher
scribeth thus
On 23/09/13 08:29, Chris J Dixon wrote:
The Natural Philosopher wrote:

Harry, the idiot who thnks inverters dont have any transformers.

Whilst the former is a matter of debate, a lot of the latest
inverters have no transformer, like this:

http://www.sma-uk.com/en_UK/products...boy/sunny-boy-
3000tl-3600tl-4000tl-5000tl-with-reactive-power-control.html

"...the new transformerless Sunny Boy is the ideal solution..."

Chris

just because the sales blurb says it is transformerless doesnt mean it is.



How to they do the AC generation anyone know,? without any transformers
or I presume inductive elements?.

Is it all Capactive and how do they perform Galvanic isolation between
the mains and the panels, surely theres no direct connection?..


They have capacitor(s) which store energy as the AC volts cycle dips below
the DC volts from the PV array.
When working on them, you have to give the automatic discharge system time
to work before fiddling about inside.