I'm Afraid that a 45W HF Amorphous kit isnt going to power that 700W HTPC Not unless you want to replace it GUTS with a
AMD FM2 A10 APU then you can Run it on a 250W DC DC Intelligent In Car PSU (even at 250W Directly from battery is quite a stretch for a 45W PV system)
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M4-ATX 250W wide input 6V - 30V Automotive PSU
http://carpcpower.com/product/m4-atx.html
let alone a 1400W inverter
Unless you want to wait +7 days for it to fill up a Battery Bank without using any power at all
Thing is with Solar Power is for them to be any use to you need to know your total watt usage of all the devices you are likely have on at any time at the same time
800 / 1200 watts pull will rapidly eat throw the daily 45W panels Yields Collect (However that's if you have the perfect days of sunshine all year round - thow Rain and Dark cloudy days into it & will reduce a 800W panels system down to 12W or 0W
However for solar You need a system that makes about the same amount of watts as you use + extra on top of that so when you have odd bad weather days you have something to keep you going for a few days.
There is better kits and better solar panels Prices are Dropping for Polycrystalline + Monocrystalline
You do better to save up a little longer and get yourself a
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RENOGY 100 Watt Monocrystalline Photovoltaic PV Solar Panel Module 12V Battery Charging - $169.99
http://www.amazon.com/RENOGY-Monocrystalline-Photovoltaic-Battery-Charging/dp/B009Z6CW7O/
its better than 2x of them 45W HF Amorphous kits
Due when you keep adding 100 Watt Monocrystalline PV to reach your 800W it give you more power more efficiency and better yields in low light levels and slightly better yields when the panels hot and a better use of surface area space (uses a smaller space yet collects more watts)
The solar market prices of panels are set to drop more as new next gen KW Panels and next gen Black Monocrystalline come in will push the prices down on the under 500W Range even the Future Next Gens - solar chip - organic solar are already appearing even commercial solar KW panels approaching the MW
You can also wait and shop around I seen 100W go cheaper