100% Stage 1: Plan 75% Stage 2: Design 80% Stage 3: Obtain Parts for Circuit 0% Stage 4: Build Beta for Test w/ results 10% Stage 5: Obtain Parts for Casing 0% Stage 6: Construct Tower 0% Stage 7: Assemble 0% Stage 8: Turn On with fire exit escape clear! 0% Stage 9: Load Testing 0% Stage 10: Live Test 0% Stage 11: Conclusion Budget: £300 As the title suggests I'm trying to make a UPS that can with stand a 24 Hour uptime during city blackouts for my entire office/lounge. Inspiration mainly came from Mike Howes solution to South Africa's timed brownouts. With him managing to achieve 5 hours on just 2 car sized 12v batteries. Second reason which finally made me start this project was I was playing Crysis Wars and had been in a Team DM for 4 hours and was doing pretty well. Then all of a sudden room goes dark street lights go out and my screaming UPS saying "SWITCH YOUR ***T OFF!". City District black out left me without power for a couple of hours, more importantly I had to sign off my game and switch off my PC. Whilst watching TV during blackout I started planning and remembered work has plenty of "scrap" batteries. Current Configuration: Intel C2D 2.66Ghz @ 3.5Ghz Asus P5K Deluxe Wifi ap 4Gb DDR2 1066 8800GTS 320Mb Perc 4e/DC SCSI Controller: RAID0 12x 72Gb 10k 5x 92mm, 4x 80mm Poweredge 2650 (2x 2.6Ghz Xeon, 4Gb RAM, 2x 36Gb 10k, 3x 72Gb 10k, Dual Redundant PSU) Netgear WNR3500 Router 2x 1Tb External Drives 2x 17" LCD's 1x 26" LCD TV Pioneer SC-LX71 amp receiver Focal Dome 5.1 All the above I would like to be powered but I think the server and 5.1 would draw to much current, Any thoughts??? Batteries At work many batteries come to us after just a few years as they wish for them to be changed and most of them have never even been used. Guess you really can't have down time in Banks. Model: BB BP5-12 5AH 12v Now I know these are somewhat small but when you combine 72 of them and they're FREE! After hiking 160Kg (352lbs) of batteries into my flat so far I'm now wondering how I'm gona stack 'em. Schematic (Simple) Thinking of having them in clusters linked in Parallel circuit all linked together with 10awg wire. Casing Other than the UPS case mod I also need to construct a tower case to hold them. I thought of going modular to be able to accompany expansion as I obtain more battieres. In drawings below thought of making it from 10mm MDF cheap and strong enough (I think), also unsure on heat produced due to tight confinement so thought of some quiet 120mm fans should suit it well. On the top is space for a 5.25" fan/temp controller unit which will only be installed if needed, there shall also be only 1 of these to start with but shall build up to 3 towers with the 72 batteries I've got already. Total weight for the tower is 72Kg, if I have to move house its gona stay and I'll move the sofa around IT! UPS - Currently The towers shall be controlled by a Belkin 1200VA, this unit as well was for free hence the budget been so cheap. Unsure if the built in charger will be overloaded with such an increase in capacity??? In the unit it has 2x 12v 9AH batteries, this was built to give you 100 mins of uptime but with age now only does 20 mins. The batteries shall remain and shall be included in the parallel circuit for the extra 20. Computer - Primary Value: £2300 The main computer which has the specs above has been a slow creation. Started life in a AKASA Eclipse 62 Case and has worked its way into an RM P3 Server case to hold the 12 drives. When moving to Holland from UK I had to borrow my dads V90 Volvo just to bring it across as was to big for my MK4 Seat Ibiza! Many parts have even survived back when I had a water explosion due to my TEC freezing the pipes, woke up with the side window having a water level The system was a dual water circuit in case you got confused with one end holding a limo radiator. Destroyed: CPU RAM MOBO HDD x2 External HDD ALL DATA (RAID0 Broken, backup USB HDD Fried) Survived: TV Card (fully under water) 8800GTS (HS was under water) HDD (pool of water sitting on top) PSU DVD Drive So as you can guess I don't really want to repeat so I'm back to aircolling. Learn the hard way and £1k later Finally I need as much advise on this as possible as if successful a tower shall be placed into my car for the car PC project to be finally completed. Post a link later with that project closer to the time (got parts just never assembled).