Durable Laptop Batteries
UPS to Inverter Conversion APC Back UPS 650 Part 2 of 2
Part 2 of 2 In this series I convert an APC Back UPS 650 into a standalone inverter / battery maintainer / UPS / power conditioner. I test the unit, do a very general overview of how it works, upgrade it’s power and runtime capabilities, and add extra cooling while explaining how and why I did each step along the way. I enjoy tinkering with old equipment and thought I’d make two projects out of one by creating this video at the same time. Enjoy. Now see the followup video here: youtu.be
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Thanks for this great tutorial
This is just what I plan to? do after power surged destroyed my locally made inverter
12 hours is a lot to ask from a UPS. You’ll need to measure your computer power consumption while doing an intensive task with something like a Kill-A-Watt, and size the battery accordingly. You’ll probably need more than 50kg of Pb Acid batteries to do it – the equivalent of about 4 car batteries. I’d recommend buying deep cycle batteries to increase the life span of the relatively expensive battery bank. The UPS? will need a fan to avoid overheating with that much battery.
How long will this run a desk top PC and Monitor? Trying to get like 12 hours run time on this exact APC to keep lead generating software up and running in case? of power failure at my work PC station.
You can physically remove the piezo buzzer without harming the UPS. As for powering your computer it will probably work fine but watch two things: The UPS temperature, and the? computer power supply temperature. Some power supplies don’t like the modified sine output and run a little warmer.
Can I just unhook the annoying beeper and use? it to power my computer with my solar batteries without plugging it into the wall outlet?
Hello mate..your knowledge and the video? was amazzzziing! I am just contemplating building one myself. Thanks a million. Will have to watch all of your video now.
… the problem was not in charging circuit ..its something with connectors …. anyway …eventually it work
i have to short the resistor .. it is high power 0.1 ohm … now there is no overload warning ..with. 4 A on AC .. actually i use UPS as protection more than UPS function
but it must? have ventilation system .. thanks again for your vids
When it shuts down after 2 seconds Is the battery fully charged? Is the battery good? You might try charging it? with another battery charger to help narrow down the problem. Without having your ups in front of me there isn’t much I can do to help.
i though that i catch the current limit resistor but as i said now there is problem with charging circuit O_x? so it wont work at battery more than 2 sec and shut down immediately …do u know any thing about this problem ?
i just add tow more not three for? test one for each phase
unnoticeable? increasing in AC current ,,,, 50 % decreasing in DC chargeing voltage O_o
Automotive grade fuses can handle significantly more than their rating at cooler temps as they are rated for extremely hot? under-hood temperatures. The efficiency of the UPS is probably about 80%, and PF is nearly 1.0 to a resistive load so 700w continuous is not a problem with adequate cooling.
The load sense on your UPS could be a resistor, a portion of PCB trace, or just limited by maxing out FET drive duty cycle. Hard to know without a detailed inspection.
You’ll have to find where the circuit senses load and modify it. If you can find that, then you can add the extra cooling and make other upgrades. I’d worry about the circuit board traces (this is a cheap single sided board), the FETs, and the? cabling – especially the connections. The 30A fuse is definitely a weak point, but I wouldn’t recommend running without a fuse as bad things can happen when a plastic box full of sulphuric acid and hydrogen gas reacts violently!
great work … just wonder about the overloading . could u explain more about the trick u did. as my UPS don’t? has this transformer …its? this with very simple circuit
wwwdotmercury-pcdotcom/product-detail.php?link=p-ups&subtitle=UPS&productid=757#
with tow IRF 3205 transistors and one LM317T
wonder if i can rise its load limit as u did ,,,, ??
the IC LM324N
this is the PCB image …
wwwDotstfimagesDotcom/images/2012/10/28/i6evw.jpg
dot== . ?
Have not got a 240 volt pannel yet so havnt had a chance to play with that side of things.. but my 12 volt set up has an inverter that? does the job well
Woops just noticed your reply
bit late.
so I think ill get 1 large new batterie and have no more issues. the 3 im using are from ups units iv found. people are so wasteful!!! ?
well that all sounds like alot of fun. iv made this absolutly awesome solar setup just need a Need dep cycle batterie. currently has 3 batteries in paralell and charges them up fast. however the system drains of over night now and I figure 1 batterie has died and is suckin itself to death
I would be very interested in? the 1500W video!
Your Smart UPS 100 will take about 30W to 40W at idle, so it won’t work well to? switch back and forth on a solar setup due to that 30*24=720wH loss per day. You’d want to take the UPS out of the equation by turning it completely off when not running on battery. This could be accomplished but would take quite a bit of work involving a microcontroller driving some relays, etc.
I’ve considered doing this myself. It’s possible but just not very practical.