opti ups 500 vs ii?

[bianchi77]

Guys

I got option ups not on at all while power up, battery voltage = 0.8V.
Any ideas ?
Thx

[dmill89]

Re: opti ups 500 vs ii?

How old is the battery? If it is at 0.8v it is probably shoot, lead acid batteries don't handle deep discharges well. You can try to charge it with an SLA (sealed-lead acid) battery charger, but if it is that low odds are it won't take a charge, there is a possibility that you could connect it (in parallel) to another charged battery if you have one, but again 0.8v is extremely low and very unlikely to be recoverable.

It looks like you will definitely need at least a new battery, the question then becomes how it got so low. Was it sitting unpowered for a long time? If not they battery may be completely (or nearly completely) dry or shorted, or there may be a problem with the charging circuitry of the UPS.

[bianchi77]

Re: opti ups 500 vs ii?

I have no idea how old the battery is....if there's no battery it will not do anything ?
I can't see even LED is on ??

[budm]

Re: opti ups 500 vs ii?

Remove the black and red cables to the batteries then plug the unit into the AC outlet, then check the DCV between the black and red cables that were attached to the battery to see if has any charging Voltage, the Voltage should be there as long as the AC cord is plugged into the AC outlet.
There should be date code on the battery also.

[bianchi77]

Re: opti ups 500 vs ii?

Ok, I will see if there's a charging voltage...but why there's no LED at all ?

[budm]

Re: opti ups 500 vs ii?

Ok, I will see if there's a charging voltage...but why there's no LED at all ?

Those LEDs may not be on unless the batteries are good and no problem with the unit, you need to look at the owner manual. Most UPS will have the charging circuit running the minute you plug the UPS into the outlet without even turning on the UPS.

http://www.opti-ups.com.tw:8080/User%20manual/

[dmill89]

Re: opti ups 500 vs ii?

Those LEDs may not be on unless the batteries are good and no problem with the unit, you need to look at the owner manual. Most UPS will have the charging circuit running the minute you plug the UPS into the outlet without even turning on the UPS.

http://www.opti-ups.com.tw:8080/User%20manual/

^This, My Opti-UPS ES1000C won't start up at all with no or dead batteries. It came with Yuasa batteries (which are theoretically good quality) but they only lasted a little over two years, the cheap (~$20 for the pair) Chinese batteries I replaced them with have lasted nearly 4 years so far.

[bianchi77]

Re: opti ups 500 vs ii?

Voltage at battery = 0.7V....no charging no LED...
Looks like there's some kind of short on high voltage side...
I can see the fuse partially burn...it's still connected but I reckon some FETs and diodes,transistors are faulty inside...I haven't checked yet but I can see the fuse like this in the photo..

[budm]

Re: opti ups 500 vs ii?

Is that the main AC fuse at the IEC AC inlet? You definitely has shorted component in the unit.

[stj]

Re: opti ups 500 vs ii?

bastards, that fuse should be ceramic!
more penny saving.

[bianchi77]

Re: opti ups 500 vs ii?

Is that the main AC fuse at the IEC AC inlet? You definitely has shorted component in the unit.

Yes it is, I've opened it this noon...but strangely it's not completely blown...
abit risky.....what do you reckon it's shorted ?

[stj]

Re: opti ups 500 vs ii?

it's blown, or it's not blown.

i'v seen ups fuses fail gently from the stress of charging old battery's
your battery is done btw.

[bianchi77]

Re: opti ups 500 vs ii?

Ok, so it's slowly blown....is it possible if I try charging my battery ? 1.09V now...looks like very bad...rating 12V 7.2Ah...

[stj]

Re: opti ups 500 vs ii?

the ups probably wants to see atleast 7v before it will try to charge that battery.
*maybe* you could trick it wih a 9v battery and a diode to stop the 9v battery being "charged"

[budm]

Re: opti ups 500 vs ii?

The charger in those kind of the units is not smart charger, it should be running with output Voltage the minute you plug the UPS into the outlet.
We need good clear pictures of the inside the unit.
12V LSA with no load Voltage reading of 0.8V I do not think you can bring it back to life with good capacity.

[dmill89]

Re: opti ups 500 vs ii?

12V LSA with no load Voltage reading of 0.8V I do not think you can bring it back to life with good capacity.

^This, the battery is shoot. Not sure about Aus., but in the us 12V 7.2Ah SLA batteries can be had for around $15 including shipping.

[bianchi77]

Re: opti ups 500 vs ii?

^This, the battery is shoot. Not sure about Aus., but in the us 12V 7.2Ah SLA batteries can be had for around $15 including shipping.

Probably I can use one of my used laptop battery to test, it's charging or not ?

[bianchi77]

Re: opti ups 500 vs ii?

the ups probably wants to see atleast 7v before it will try to charge that battery.
*maybe* you could trick it wih a 9v battery and a diode to stop the 9v battery being "charged"

That's good idea....diode on positive side ?
positive charger-----anode-----cathode---plus battery---battery----negative battery----ground .....?

[bianchi77]

Re: opti ups 500 vs ii?

The charger in those kind of the units is not smart charger, it should be running with output Voltage the minute you plug the UPS into the outlet.
We need good clear pictures of the inside the unit.
12V LSA with no load Voltage reading of 0.8V I do not think you can bring it back to life with good capacity.

Not a problem, I'll take picture of it later on....component side ? track side ?

[dmill89]

Re: opti ups 500 vs ii?

Probably I can use one of my used laptop battery to test, it's charging or not ?

Do you like fires/explosions? If not hooking up a Li-Ion battery to a charger designed for an SLA battery is a very bad idea.