Power Source

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Power Source

Postby Falcon57 on Sun Feb 10, 2008 4:04 pm

I wanted to get a rechargable battery to power my 250 watt lights and one for my computer system. Any ideas where I could get something like this?
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Re: Power Source

Postby mfd78 on Sun Feb 10, 2008 6:32 pm

Uh...good luck. A battery that can run multiple 250w lights and a system would need to be huge. A large car battery might work for 5 minutes or so.

If you want to run batteries, I wouldn't worry about the lights too much. You can go a couple days without lights. You want to focus on the pump and heater. They make small, cheap battery (D cell) air pumps that can last for quite a while and keep the O2 in the water. You can use an inverter and extension cord with your car if your garage is close. Most people end up buying a generator - but you have to be home to use it.

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Re: Power Source

Postby BraenDead on Sun Feb 10, 2008 9:48 pm

Agree with Steve, running the pump is most important, heater next most important in the event of a power outage, lights certainly aren't needed except for prolonged periods. You would need a generator to give any any meaningful duration to keep the lights going. Otherwise, I would get a standard UPS to power general equipment. Here is a sizing calculator for UPS's:
http://www.apcc.com/template/size/apc/rslr/index.cfm

Hope this helps,

Bob
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Re: Power Source

Postby Falcon57 on Mon Feb 11, 2008 4:32 am

Thanks for the advice. I guess I just wanted to take the lights and pumps off the power grid and reduce my electric bill. I think found something that could power my pumps for a few hours if my electicity was cut off for some reason.

http://www.amazon.com/Xantrex-Technolog ... auto_img_1
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Re: Power Source

Postby BraenDead on Mon Feb 11, 2008 8:48 am

Falcon57 wrote:Thanks for the advice. I guess I just wanted to take the lights and pumps off the power grid and reduce my electric bill.


I guess I am confused how this would reduce the power bill? Sure, you can power the lights for 10 hours off the battery. But, the power it takes to recharge the battery is greater than the actual power to run the lights (power is lost during the conversion/inverting). Also, using the battery repeatedly will rather quickly lower the capacity of the battery, leading to having to replace the battery/unit regularly.

Additionally, I'm not sure that this would be the safest thing for all equipment (lights/pumps, etc...). Most cheaper DC-AC inverters are square wave/modified sine wave inverters as opposed to the true sine wave of AC power. Works fine for most things, but other things really do not like the square wave, can cause problems with some pumps/ballasts.

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