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I was wondering, can anyone recommend some books on alternative energy the contain the maths and tech details involved?
All the book i have seen so far gloss over the formulas. As I come from a technical background, I am keen to know.

What kind of alternative energy do you have in mind? Wind-electric, hydro-electric, solar-electric, solar-thermal, geothermal, biomass, something else?

Pretty much all the electirc ones but hydro, and solar look to be the best place to start

The 'Mother Earth News Almanac' and 'Mother Earth News handbook of homemade power' have some useful if slightly dated info in them.

This might be helpful but it depends what exactly your looking for and how deep into it you want to go.Something for you to ruminate on whilst finding the whats your best option.
Dont ruminate too hard and remember that viridigenous ig hard work ( )
http://www.hybridynepower.ca/Downloads/ ... uation.pdf

try http://www.scribd.com/doc/30434750/Wind ... nd-Turbine for the UK's small wind guru - he has lots on scribd

and David Mackay's general overview http://www.withouthotair.com/

I have tried both small wind and PV and have 5 years practical experience - ask away !