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Old 03-19-2018, 11:25 PM   #1
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Default Power Inverters

Looking for a low power inverter for low power 10-100W applications where there is no power available. Need 10 hours run time. Can't seem to get that out of a UPC so I'm leaning towards an inverter and I'll pick up a battery from the auto parts store.

Found this "Mighty Max" inverter on Amazon.
https://www.amazon.com/1000W-Power-I...ct_top?ie=UTF8
Are those things any good?

Anyone have any experience with this brand or any other brands?
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Old 03-19-2018, 11:51 PM   #2
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Originally Posted by MikeFL View Post
Looking for a low power inverter for low power 10-100W applications where there is no power available. Need 10 hours run time. Can't seem to get that out of a UPC so I'm leaning towards an inverter and I'll pick up a battery from the auto parts store.

Found this "Mighty Max" inverter on Amazon.
https://www.amazon.com/1000W-Power-I...ct_top?ie=UTF8
Are those things any good?

Anyone have any experience with this brand or any other brands?
I have heard good things about them as a cheaper brand. But why buy a 1000 W inverter when all you need is 150 W (for cushion)?

100 watts on 12 V is about 10 amps factoring in conversion losses. A deep cycle battery could probably do that for 10 hours easily, but I've learned the hard way that car batteries and other "cranking" batteries aren't meant for power supply applications. They are designed to deliver a lot of amps in a short amount of time. They aren't built to supply continuous current for long periods. They just don't have the life or deep cycling wherewithal, but they are cheap. If I needed backup power from a battery source, I'd get a golf cart battery(ies).

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Old 03-19-2018, 11:53 PM   #3
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Depends entirely what you are powering. If you are ok with a choppy square wave looking output, head over to Harbor Freight. If you need true sine wave, the price goes up.
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Old 03-20-2018, 12:16 AM   #4
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What kind of load it will be feeding to the item you need to be on the inverter?

keep in your mind there is two verison of inverter on market one is modifed or square wave or sine wave.

few items will work only on sine wave so be aware of it.

Ya can get larger deep cycle battery or diesel cranking /deep cycle battery or get multi ( 2 or more ) set up to make it longer.
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Old 03-20-2018, 06:12 AM   #5
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There are lots of UPS that can do 100W for 10 hours but you wind up with extra batteries. I did a quick calc with one brand I have used a lot and it comes out to right about 10 hours but it's $1300. They have rackmount too.

With the UPS the main unit isn't too bad for a high quality inverter and rectifier, but you're paying a LOT to attach little extra batteries, when you roll your own you can take advantage of big batteries but you don't get as neat of a package.
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Old 03-20-2018, 08:09 AM   #6
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The inverter I quoted is (according to manuf) pure sine wave. One review on Amazon (if true) shows it connected to a scope with a nice waveform. Reason I'm considering the 1kW unit is that a 500W unit is only $10 cheaper.

As to battery, I'll go for the golf cart battery. Plenty of battery houses around here and plenty of golf carts around here.
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Old 03-20-2018, 08:30 AM   #7
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Quote:
Originally Posted by MikeFL View Post
The inverter I quoted is (according to manuf) pure sine wave. One review on Amazon (if true) shows it connected to a scope with a nice waveform. Reason I'm considering the 1kW unit is that a 500W unit is only $10 cheaper.

As to battery, I'll go for the golf cart battery. Plenty of battery houses around here and plenty of golf carts around here.
Ah the bennies of living in retirement land.....
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Old 03-20-2018, 01:23 PM   #8
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Quote:
Originally Posted by MikeFL View Post
The inverter I quoted is (according to manuf) pure sine wave. One review on Amazon (if true) shows it connected to a scope with a nice waveform. Reason I'm considering the 1kW unit is that a 500W unit is only $10 cheaper.

As to battery, I'll go for the golf cart battery. Plenty of battery houses around here and plenty of golf carts around here.
Depending on how you will use it, I'd consider a Low Voltage Disconnect. If you drain those batteries, you're really killing their lifespan.

You can get a fairly cheap LVD (adjustable for various cell technologies) for auto applications, or just use a solar charge controller ... you'll get the LVD (HVD as well) , and if ever you want to hook up a panel to it your ready for it.
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Old 03-20-2018, 03:33 PM   #9
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If we fry one golf cart battery that's ok. But thanks.

We get asked to do public demonstrations from time to time and it would make things so much easier to have our own power source.
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