Erika - HOMER (http://www.homerenergy.com/) is a hybrid power system modeling 
tool for on- or off-grid applications. There is a 2 week free trial period and 
then it costs $100 for a 6 month software license.  I haven't used it yet but 
have heard good things. 

- Andrew Truitt


Sent from my iPad

On Mar 25, 2013, at 7:15 AM, "Erika Weliczko" <er...@repowersolutions.com> 
wrote:

> Does anyone know of an efficient calculator tool to help compare diesel /gas 
> generator to PV + batt + small generator for an off-grid vacation house?
>  
> Regards,
> Erika
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