Battery Backup Guide

Armughan asked:


I have two devices which need to be powered up by -48V DC power. One device has two components IDU and ODU (microwave equipment) the combined power consumption is 40.5 Watt(18.5+22), the second equipment has power consumption of 60Watt (multiplexer). The rectifier also has to charge the batteries for backup.

What will be the rating of the rectifier i should use? also if i need backup of 4 hours what will be the rating of the battery?
Also it will be very helpful if someone can recommend some book or pdf for better understand the power concepts.. like what if i have to make the same calculations for AC power..
Can you mention the required rectifier without battery backup.
If we take battery backup into calculations the backup time required will be 4 hours and recharge time will be 10 hours.

Freedom asked:


Hello,

I am working making a battery backup setup usually called a UPS (uninterruptible power supply) using a power inverter, a car battery and a battery charger.

I am likely going to use http://cgi.ebay.com/OSP-1500W-PURE-SINE-WAVE-POWER-INVERTER-DC-AC_W0QQitemZ350267893228QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item518d97e5ec this inverter. It delivers pure sine wave power which is what I need as I am going to be using this to power electronics such as a computer and a projector. I am a little lost on which battery charger would be best though. I’ve seen something called a ‘battery tender jr’. But I don’t know if that would be best.

It sounds ideal. What I’ve learned is that I probably want a float charger with an option of either manually or automatically once in a while charging the battery to it’s maximum for a few hours to enable longevity in the batteries life.

Any input would be appreciated.

Thanks!
I don’t think I understand your answer. It sounds likely that we aren’t on the same page as to how this is set up. Plugged into an outlet (120v)is a battery maintainer, it is then connected (12v) to a battery. The battery (12v) is connected to a power inverter, and then the inverter powers devices(120v).

sree s asked:


Hai All,

I am using Acer Aspire 4520, already 1 year over (out of warranty). Now i am not getting the battery backup. Maximum i am getting 30 minutes, i contact with the acer customer care and they told to buy a new battery and its Price is 3500. I want to know is it possible to repair the battery? Or is there any way to increase the battery backup.??? Please Help…

Benton asked:


i have an apc battery back up and i was wondering if i couls use it on a guitar amp (tube amp) without any problems

Sariful asked:


I want the answer from somebody who is using the phone .Tell me about its detailed features.It’s pros and cons. I also want a cdma handset that has a good battery backup & sound clarity in india.

drscorpio_30 asked:


I had my alternator and battery plus cables replaced, what’s causing my battery to keep draining?

Patrick asked:


I had a 350W AC motor that did not work for this purpose. Do I need to have a DC motor? Also, what type of battery should I use? Obviously, it must be rechargeable so should I go with a lead-acid battery? This system will have a human-powered crankshaft, a motor, a battery, an inverter, and will need to produce 100W maximum to charge my laptop battery through the inverter.

mtm asked:


I thought that you need a physical contact between the charger and the battery so the electricity actually arrives inside the battery.
Now my new electrical toothbrush seems to work differently. It has a battery, the manual confirms. It also has a charger. But all I need to do is to put the toothbrush on the charger.

How does that work? Both parts are plastic covered.
Yes, a Sonicare product.

woohoo asked:


I am looking to buy a new battery for my MacBook. I am looking to buy it on eBay. I notice there are two types of batteries on sale. One is an “original” MacBook battery, which I’m assuming is a brand new battery. The second is a rechargeable battery (like the ones sold on the Apple website). Is there a difference between these two or are is the difference really just that the ones that say “original” are actual Apple batteries. The other ones do not say “Apple,” so I’m assuming they’re just generic batteries.

STL Biker asked:


Isn’t one type of battery better than the other? Why don’t all electronics use the better battery and which type of battery is the better battery?