# Will my newly constructed power inverter work?

Discussion in 'General Electronics Chat' started by layxide11, Apr 26, 2016.

1. ### layxide11 Thread Starter New Member

Jul 30, 2015
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Hello guys
I just constructed a power inverter using a scrap 650W UPS. I didn't do much building it anyway, i only removed the latching on its battery and i connected it using a single core corper wire to a 12V/75A car electrolyte battery. When i charged it, it worked and lasted a while to light load of 110W. Please i need to know if this connection is right. Also, if i can still use this same construction to light up my entire house (about two 1hp air condition, one 1.5hp air condition, one fridge and an extra load of like 1.5KW) by increasing the number of batteries. Please i would like to know what hazzard this could cause as well.

2. ### blocco a spirale AAC Fanatic!

Jun 18, 2008
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What do you think; Can you run your entire house off a car battery and a 650W inverter?

Aug 21, 2008
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4. ### tcmtech Well-Known Member

Nov 4, 2013
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With air conditioners and refrigerator or freezers add up your wattages and then multiply by 4. That's the minimum continuous duty rated inverter capacity you need.

For battery capacity add up all wattages then double that then multiply that number by the number of running hours you need and divide that number by your battery volts to find your minimum amp hour capacity you can get by with.

5. ### Alec_t AAC Fanatic!

Sep 17, 2013
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1HP=746W. Your inverter is less than that, so clearly won't run all the things you want it to.

6. ### dannyf Well-Known Member

Sep 13, 2015
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There is a quick way to know for sure: plug it in.

7. ### AnalogKid Distinguished Member

Aug 1, 2013
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The total energy you can get from an inverter is limited by the size of the transformer. If that transformer and its driving circuit are designed for 650 W, then that is the limit. Adding extra batteries means it will run longer, not drive a larger load. Your total load comes to around 4500 W, so your single inverter is not enough.

The hazard is that of having a bunch of large, liquid-acid batteries laying around with exposed very-high-current terminals, that produce poisonous gas.

ak

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8. ### layxide11 Thread Starter New Member

Jul 30, 2015
18
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Thank you very much. Your points were well articulated and very clear enough for me to understand.