Uninterupt Power Supply Unit for CRS

**eviltrain** · 17th Mar 2010, 11:57

Lets say i need to get a UPS which can last around 4-6 hours for a external filter canister ( rated 18 watt ) and a chiller ( Resun CL 450).

Anyone knows the price range for it and what model it is?

**Wahlin** · 17th Mar 2010, 14:25

Originally Posted by eviltrain

Lets say i need to get a UPS which can last around 4-6 hours for a external filter canister ( rated 18 watt ) and a chiller ( Resun CL 450).

Anyone knows the price range for it and what model it is?

You need a big UPS. Say your chiller is 450W and run it for 6 hours, that will require at least 2.7KVA capacity. Something like this

http://www.apcc.com/resource/include...se_sku=MX3000W

And that is about 100KG in weight.

**eviltrain** · 17th Mar 2010, 14:29

thanks brother Wanlin, i guess i will skip the idea.

**Shadow** · 17th Mar 2010, 15:58

maybe you connect only the filter and fan to UPS. You need to set the fan somehow that when the power is OFF, fan automatic ON. It may not be as good as chiller but should help maintain the temperature.

**eviltrain** · 17th Mar 2010, 17:53

bro Shadow,
my main concern will be survival of my CRSs. i went to check around. a simple one will cost like 200-300 range

**BFG** · 17th Mar 2010, 18:08

When choosing a UPS, look at the sine wave. Some motor would not work with certain sine wave produced by the UPS, which tend to damage the motor.

**kenkenstomp** · 19th Mar 2010, 16:53

Why not use a AC/DC pump that connects to a sponge filter instead? I think it's cheaper that way.

A AC/DC pump has a battery that kicks in to operate the sponge filter when power is cut off.

**weng0202** · 19th Mar 2010, 17:27

Originally Posted by eviltrain

Lets say i need to get a UPS which can last around 4-6 hours for a external filter canister ( rated 18 watt ) and a chiller ( Resun CL 450).

Anyone knows the price range for it and what model it is?

Your shrimps should be able to survive without chiller for a few hours in the event of a power failure. So just focus on keeping the pump going...

**eviltrain** · 19th Mar 2010, 17:34

so a battery operated air pump will do the job?

**khtee** · 19th Mar 2010, 22:25

you can setup a HMF using airlift pump with the ACDC air pump as the driver. Run parallel with your canister.

**kenkenstomp** · 19th Mar 2010, 22:39

Originally Posted by eviltrain

so a battery operated air pump will do the job?

There are battery-operated air pumps. These require one to manually switch it on and off.

And there are AC/DC airpumps which is powered by electricity during normal times and automatically recharging its built-in battery so that in the event electricity breaks off, its built-in battery can automatically take over water-aeration function.

**stormhawk** · 21st Mar 2010, 07:14

Like what Shadow has said, just use a cooling fan. Rig it up to work on a set of rechargeable batteries or with a smaller UPS meant for PC units. That should tide your shrimps over for a few hours in the event of a power failure.

The shrimps can survive on a battery operated air pump, with regards to aeration. You should however, think of how to save the filter bacteria in your canister filter etc. Those tend to die off within a few hours if the water flow and thus oxygen flow is cut down. So after a power failure, do not power up your canister straight away, because the water coming out of the canister will be full of dead bacteria, which can foul up your tank and literally kill your livestock. The water is usually discoloured (brownish etc), or full of detritus coming out. Letting the canister drain into a bucket or right to the sink/drain is pretty much advisable before you reconnect it back to the tank. It doesn't have to be long, like a few minutes or so, until it clears out. Get your bacteria starter culture etc out and dose the tank again.

Besides in Singapore, power failures seldom last for very long. The fines the power company gets whenever there is a power failure is enough incentive for them NOT to mess things up.

**silane** · 21st Mar 2010, 08:57

Originally Posted by eviltrain

bro Shadow,
my main concern will be survival of my CRSs. i went to check around. a simple one will cost like 200-300 range

Actually, you can DIY a UPS, with a budget, you can DIY one that can operate a canister for more then 1 days in case of power failure, of course you can add in fans and such and the duration will be reduced.