Rosie

[EW Zuber]

Is the Rosie a low frequency inverter or a high frequency (AKA;transformerless) design?

[Vic]

Rosie is said to be an HF Inverter-Charger.

EDIT, to add:

EW Zuber,  have you seen the YT Video on the Rosie,  produced by NAZ (the former AZ Wind & Sun company)?  It does show that the Rosie,  is a very capable Inverter Charger,  that just keeps getting better, and better (more functions), via FirmWare Updates:
https://www.youtube.com/watch?v=hApsJdh7AE8

I want one !!

Vic

[boB]

Rosie is HF design but uses transformers.   i.e.  It is isolated.

If you are concerned about surge power, Rosie surges a LOT.  About 2.5 to 3 times continuous power at least.

Rosie weighs about 44 pounds.

There is a review video on Northern Arizona Wind and Sun's (NAZ) YouTube channel

boB

[mahendra]

Rosie is HF design but uses transformers.   i.e.  It is isolated.

If you are concerned about surge power, Rosie surges a LOT.  About 2.5 to 3 times continuous power at least.

Rosie weighs about 44 pounds.

There is a review video on Northern Arizona Wind and Sun's (NAZ) YouTube channel

boB

Interesting Bob .
Does the use of the transformers make them t more robust and improves its surge capabilities?

This has puzzled me for a while because some HF inverter can surge decently while some can't do much

[boB]

Mahendra, Surge just has to do with the design of the inverter, including the transformer.

The transformer is between the battery side and the inverter or AC output side.

A battery based inverter does not have to have a transformer to work but then there are other problems like noise.  As far as I know, all battery based inverters are isolated with a transformer to the high voltage AC side.  I think this is a UL requirement for safety but it also helps tremendously with noise.

When someone says transformer-less, that may be true for a grid-tie photovoltaic inverter. Same thing as un-grounded solar.  They still have inductors though which may look like transformers.

Why do our inverters surge ?  Hopefully, it is because we know what we are doing.

boB