Battery Power For A Canister Filter

[-Ian-]

Hi all

Hope someone who knows a bit more about electronics than me can help with this. My girlfriend owns one of these: http/www.opticalvision.co.uk/astronomical_accessories/power_tanks
It’s a battery pack for a motorised telescope mount, a 12v battery with a 7AH capacity and the power output is via a car cigarette lighter socket. If I bought an inverter to connect to it, for how long could it power an Eheim 2224 filter?

I know the 2224 is an 8 watt filter and for the standard uk 240v mains supply I came up with a figure of 210 hours using this website: http/www.jobsite-generators.com/power_calculators.html

Would be very grateful if someone could confirm if I have worked all this out correctly, 210 hours seem very high.

Thanks

 

[Rda]

You would need to factor in the losses for your inverter, these would be pretty high as they tend to generate quite a lot of heat.

You would need to factor in the losses for your inverter, these would be pretty high as they tend to generate quite a lot of heat.

 

[Neo8223]

Hi, in all likeliness, it'd be about 20 hours. I've tried it before, not worth the hassle I'd suggest just buying a 12v pump and making your own filter. Then it'd last for weeks!!

 

[-Ian-]

20 hours would be more than enough, half that would be plenty.

The reason I ask is we're looking at having the house re-wired next year so need some way of powering the filter when the mains is switched off during the day.

Next question is which inverter to try.

 

[Neo8223]

http/www.ebay.co.uk/itm/Car-Inverter-DC-12V-AC-220V-Power-Adapter-12A-150W-/220773049116?pt=UK_Home_Garden_PowerTools_SM&hash=item336719631c - That one is rubbish! really low efficiency! (i used that one) and the plugs fall out!

 

[PyroBrit]

Tesco, Halfords and Maplin all sell inverters for £15 upwards.

If you borrow a spare car battery from someone, you should get a lot more hours out of it just in case your rewiring takes a little longer.

 

[Blubble37]

how about an uninteruptable power supply or UPS?