Battery longevity with AC power inverter draw @ 175W
Battery longevity with AC power inverter draw @ 175W
(OP)
I was wondering if anyone out there could show me how to solve this problem. Basically I am contimplating making a portable computer that I want to power with a battery and an AC power inverter (I couldnt find a 150W power supply that accepts 12v DC - only 120v AC so I have to use an inverter)
How long will the computer run if it is using 175 watts @ 120 volt AC inverted from a 12 volt DC 12 amp hour battery. How long would it run if it were drawing off a 12 volt 32 amp hour battery?
Also do I really need a true sine wave inverter or will a regular modified sine wave inverter power a desktop computer?
Any additional information anyone has on the subject of portable power or building a portable computer/laptop please inform me or give me a link.
Thank You
How long will the computer run if it is using 175 watts @ 120 volt AC inverted from a 12 volt DC 12 amp hour battery. How long would it run if it were drawing off a 12 volt 32 amp hour battery?
Also do I really need a true sine wave inverter or will a regular modified sine wave inverter power a desktop computer?
Any additional information anyone has on the subject of portable power or building a portable computer/laptop please inform me or give me a link.
Thank You






RE: Battery longevity with AC power inverter draw @ 175W
I would apreciate any help anyone could offer.
Have a happy new year!!!
RE: Battery longevity with AC power inverter draw @ 175W
Under the above conditions, the battery provides V*I=12V*12A=144 watts for 1 hour. If your computer really draws 175 watts, you're going to be disappointed. On the other hand, if your laptop?? draws a more reasonable 60 watts or so, you'll get close to a couple of hours.
Have you thought about running the laptop directly off the battery? The inverter/converter combination will suck about 30% of your battery capacity.
TTFN
RE: Battery longevity with AC power inverter draw @ 175W
I was wondering if anyone out there could show me how to solve this problem. Basically I am contimplating making a portable computer that I want to power with a battery and an AC power inverter (I couldnt find a 150W power supply that accepts 12v DC - only 120v AC so I have to use an inverter)
///What you really are looking for is a DC to AC converter. There are plenty of them on the market.
Visit:
http://www.thomasregister.com
and type Converters: DC-AC under Product or Service which will return 50 companies to inquire about 150W DC-AC inverter (generally, converter) with 12VDC input.\\\
How long will the computer run if it is using 175 watts @ 120 volt AC inverted from a 12 volt DC 12 amp hour battery. How long would it run if it were drawing off a 12 volt 32 amp hour battery?
///It will run for:
time=12A-hr/(175Watts/12VDC)=0.82hours,
actually, it will be less since 175Watts is the inverter output. Normally, the inverter input may be 200Watts, depending on its efficiency. Then, the time=0.72hours.\\\
Also do I really need a true sine wave inverter or will a regular modified sine wave inverter power a desktop computer?
///If the inverter output voltage meets 5% of the Total Harmonic Distortion (THD).\\\
Any additional information anyone has on the subject of portable power or building a portable computer/laptop please inform me or give me a link.
///Try to surf web using proper terminology, e.g. converter or inverter, DC-AC, Battery, Charge, Capacity, etc. Visit
http://www.powerstream.com/in3s.htm
etc. for more info and pictures\\\
RE: Battery longevity with AC power inverter draw @ 175W
Thread233-40406 I wish I could edit the original thread to reflect my current situation but this link will give you the full details of my project ;)
RE: Battery longevity with AC power inverter draw @ 175W
Moreover, your cost figures in your original post suggests that your efforts could be directed to finding a good laptop for under $1000: Compusa shows an HP Presario for $849: http://www.compusa.com/products/products.asp?id=334&category_id=334&srch_type=catg2#
Buy a couple of spare batteries and save yourself the aggravation, since there's no way you can package what you want into the same volume as a Presario+3 spare batteries.
Although the total cost will be higher, the utility increase, volume decrease and time saved might be worth the effort.
TTFN