has anyone made

[tnthudfl]

have any of you ever tried to make a electric filter w battery back up on it

 

[Bloo]

No sorry can't help - but you might find that more people actuaully look at your post if you give some more info in the description box below the title

 

[tnthudfl]

No sorry can't help - but you might find that more people actuaully look at your post if you give some more info in the description box below the title

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thanks bloo

 

[daza]

There are a few results in google

A UPS (Uniteruptable Power Supply) would work.

 

[Lateral Line]

Last year, I was discussing a UPS in this thread. It turned out not to work.

I modified your title to make it a little less "ignore me" fodder.

 

[daza]

Last year, I was discussing a UPS in this thread. It turned out not to work.

I modified your title to make it a little less "ignore me" fodder.

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uhm, interesting, I'm suprised. Not seen that thread before. It's a shame that a computer UPS didn't work because realistically that's all that is available to us in the hobby (price wise).

Perhaps the computer UPS is trying to be too 'intelligent'. There is no doubt it can be done with a UPS (in the general sense of the word), the question is what kind, now we know computer ones won't work. If I had the time and motivation I'm sure I could DIY one.

anyway, don't want to take up your thread waffling tnthudfl

 

[Ed4567]

AFAIK the quality of the AC current that a UPS produces varies considerably- lower quality ones tend to produce a squared off wave which causes problems with motors (if you think about the way the impellor is rotated with a changing E-M field this makes sense).

This is particularly a problem since computers convert AC to DC so the quality of the sine wave is unimportant.

However I know a few people sucessfully use UPSs so maybe this is worth a try.

 

[Lateral Line]

>>> is trying to be too 'intelligent'

Frankly, I was suprised the UPS didn't work. I figured it probably had something to do with the quality of load that the pump was presenting. A very low current, inductive load. I was wondering if the UPS "saw" the load at all and was simply shutting down because it "assumed" it was looking at something that was powered off or in standby, and hence was protecting it's charge until something came along that needed it.

 

[sub.42]

>>> is trying to be too 'intelligent'

Frankly, I was suprised the UPS didn't work. I figured it probably had something to do with the quality of load that the pump was presenting. A very low current, inductive load. I was wondering if the UPS "saw" the load at all and was simply shutting down because it "assumed" it was looking at something that was powered off or in standby, and hence was protecting it's charge until something came along that needed it.

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LL,

I think that we figured out it was a reactive load, so yes, the UPS would never 'see' the motor correctly, add a bit of square wave, and its laughable. I have looked at so many invertors over the past year, that I'm sick of buying-testing-returning them. They are almost all square wave outputs. That is most of them! I have found one that will do the trick, but its lots of money...

I will give you a for-instance. My laptop gets hammered at work. I need it for my schematics, and part numbers, so it spends most of the day turned on. Now, If I try to charge it using my company supplied (read cheap!) invertor, the power supply gets very hot. Charge at home, in the standard socket and its cool baby!

You can get pure-sine invertors, but they are twice the cost of standard invertors. You must also add the cost of an intervention relay, and all the associated protection circuitry. It can be done, but it gets expensive!

sub.

 

[Lateral Line]

Hmmm, got me thinking now. Sine wave generator, hefty amplifier stage, probably MOSFETS now, or 2N3055's as I probably have some of those hanging around. Step up transformer. Bit of overload protection/current limiting...

 

[mattbeau]

Perhapse I can suggest a APC UPS.

We use them for CCTV and to condition power in bad cases of High Ground to neutral line noise on PLL (phase lock Loop) sensitive circuits In our EAS (electronic Article Survailence) Equipment

They are of course more expensive

another suggestion for generating a cleaner signwave is using a commutating filter (but again it isnt perfect)

 

[itZme]

I have successfully run 3 different HOB filters and 3 heaters from one APC brand BE350U UPS ($29) I had it between 3 of my tnks and plugged the filters/heaters into it. Then we had an outage for about 15 minutes and it never even ran out of juice. I was surprised that it lasted so long. Maybe I was lucky and didn't have the heaters all come on at once because I think it had a 200w max rating and i'm sure the filters+ heaters would've been that high. It says it has built-in line conditioning which will help your devices last longer too.
If you add up all of your devices' amperage (look at the label for the 110V 3a or whatever the value may be for your stuff) then multiply the total amps x the voltage to get your required VA rating. My new one is a 1000VA and it cost me $69.

Like if you had an air pump that drew 1 amp, an aquaclear 300 that drew 3 amps and a 100 watt heater that draws 1 amp then you would have 1+3+1 =5 amps X 110 Volts = 550

550 VA UPS needed. VA just stands for volt/amps

-- itZme

 

[Mordinbar]

Heres a link to a thread i powted a cuople days back about UPS that are designed for aquariums, (Actually i think the thread is still on p1 but not sure on that)\


http/www.fishforums.net/index.php?showtopic=103829




-Mord

 

[Yenko]

Filters use surprisingly little energy - my fluval 304 draws only 15w.

 

[morgan]

I have bought a battery powered air pump in case of power cuts. It is also useful if you need to move your fish, they can have aeration while they are being moved.. I haven't had to use it yet. It cost about £12, it was on offer. I wasn't looking for it, I saw it online when I was buying some other supplies.