An 18Ah battery is probably not going to give you much of a lifespan unfortunately. Mid upper range gaming PCs pull just over 200Watt under load - based on my Core i7, 32GB RAM, 7x 3TB HDDs, GTX2060 Super - it pulls around 212Watt playing 2021/2022 games at 4K. Fairly similar to an office PC & monitor. Thx for everybody that contributed to this ible, there are a lot to leaning about UPS and battery from the Your 430watt UPS is theoretically capable of powering your TV since the TV is probably less than 100Watt. it is a good idea to add a PC fan to cool the transformers, cause they gona get pretty hot!! not necessarly running them at 12v, even 5v or 9v is a good start, and giving an acceptable noise, or drill some addtionnal cooling hole into the UPS case, for additional passive cooling. Plus 3- Dont attempt this project with Backup UPS that autoShunt down after some time, why? because those Backup UPS are made just to give you anough time to save your work, and to shutdown your PC when there is a Power Outage!! Even if you increase battery capacity, you wont be able to keep the UPS running because the running time is set by the chip inside the UPS! Not necessarly batt the battery capacity. Perso for me time is not an issue, I prefere slow and safe charging. if you want do this type of project, with only 2 backup UPS 7A, do not go with to high rated battery!! 50A max!! Why, because the 2 UPS (2 in the case) are gona struggle constantly to be able to provide this big amount of current asked for such high rated battery (50A in our situation), to be able to fully charge it!! Even the autor say that it take a lot of time to charge it completly. I had to point this because some think because I got a high rated car battery so I may use it! You may be you should first know what kind of car battery it is!! 2. Deep cycle battery or marine battery is used here, smart move, dont was your time with car battery, because even if you see a car battery rated 70A or more, it doesnt mean those kind of battery are made to produce 70A during a long period of time, not everybody understand this!! They are rated 70A or high, to be able to give a proper kick to start the engine, that all, after all that the car is running on gas, not on voltage either on Amps. I hope you explained that in your able from the start, and also provide a schematic since it is a electric project, and it is always easier to have a schematic. From my understanding you "fused" to UPS able to charge 7A Battery to be able to charge a bigger battery, this case a 40-50A Battery. Hi all, I know this post is very old but I will add some analysis and advises. (yeah, I know there's inefficiencies in the UPS, but lets keep math easy) So, assuming 12 volts, that means that, after adjusting for the voltage differences, I need a battery with at least 41.6 ampere hours. Check yours out first to make sure you won't need two car batteries. that means: P / V = I 500 watts / 120 volts = 4.16 ampere hours (at 120 volts) UPS batteries are usually 12 volts, but some are wired with two batteries in series. So I now knew I needed 500 watts, and I wanted 60 minutes of power. They can't handle being run for longer than a few minutes at this rating, but the batteries die before it's a problem normally. CAUTION: I discovered the hard way after nearly starting a fire and destroying a UPS that you need one that is rated at at least twice the wattage you are consuming. Even though the two monitors were hooked up to the same computer, I needed to distribute my power load more evenly to get longer battery life out of my petty UPS's. Find the WATT rating) with one computer and one monitor on each. (yikes!) Currently I was running on two 300 watt UPS's (NOTE: VA is not equal to WATTS. My total power consumption was roughly 500 watts peak. I was trying to power two computers (desktop and file server), and two flat panel monitors. Wire crimp terminals that will fit over the threaded rod. Wing nuts the same size as this threaded rod Wire (12 awg or larger two different colors)Īdapters to go from the car battery terminals to threaded rod. UPS that is rated at least double what you plan to draw (see step 8 to understand why). I needed more power! My solution: Car batteries. I wanted my UPS to be able to last for at least 60 minutes in a power outage. Well, shortly after, the power went out for longer than the battery could keep my computer afloat. After getting frustrated when the power flickered one day, I immediately went out and purchased a UPS. For what would appear common sense to me, but perhaps not to all, I have all of my computers on UPS battery backups.
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