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LiIon, LiPo, NiCd & NiMh General General Battery Support |
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01-24-2016, 03:28 PM | #1 (permalink) |
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Join Date: Feb 2013
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About Generally how much
Good Sunday to everyone!
I wanted to throw this question out there as I think if it more often nowadays; Generally how much does it cost me each time I charge up a 3S 1000mah and a 3S 2200mah lipo using my hitec x4 charger here in new York? Sometimes I charge 4 at a time and different cell lipos are charged. I have this gut feeling that every time I charge my 6S 8000mah lipo Im racking up my electric bill. Maybe im wrong? Does anyone have a general idea about this? Hmm |
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01-24-2016, 06:08 PM | #2 (permalink) |
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Join Date: Feb 2015
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A simple and pretty accurate way to see this would be to buy a Kill-A-Watt plug in meter and plug your power supply + charger rig into that and look at the totals over a single charge.
But, for fun I did some *really rough* estimates of the batteries you gave. This was a quick and dirty to give you an idea how to calculate it, I'm not bothering to think through how accurate this is. I assume you get charged for electricity based on kWh aka kilowatt-hours aka 1000 watt-hours. A watt-hour is a quantity of power (kind of like a gallon is a quantity of liquid) So what you need to know is how many watt-hours of power do you put in your batteries? To get the watt-hours needed, we take the amp-hours you put in, and multiple by the voltage. Well we know your batteries are 3S 1000mAh (amp-hours), 3S 2200maH, and 6S 8000mAh. Let's do the 3S 1000mAh first: - To make things simple, I assumed you put back 80% of the capacity. so 800mAh, or 0.8Ah. What about voltage? Voltage varies during charge, but I made an wild assumption that voltage works out to an average 4V per cell over the entire charge while putting back 0.8Ah. So, 12V * 0.8Ah = 9.6Wh (watt-hours). I don't know the electric rates in New York, but for me they vary from ~$0.15 - $0.33 per 1000 watt-hours. Assuming the worst case, that works out to $0.00033 per watt-hour. $0.00033 * 9.6Wh = ~$0.0032. That's about 1/3 of a penny to charge. - How about your biggest battery, 6S 8000mAh? 6S * 4V = 24V 80% of 8000mAh = 6.4Ah 24V * 6.4Ah = 153.6Wh. $0.00033 * 153.6Wh = ~$0.051, about 5 cents to charge. Note: This is only useful as a really rough guess. I made several assumptions while doing this, writing this post took longer than the calculations and guessing. I also didn't account for the efficiency for the power supply and the charger. I suspect my "4V per cell" guess is high, but maybe that balances out with the PSU and charger inefficiency. Now I'm curious so I'll hook my Kill-A-Watt up next time I charge something and record some actual data.
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01-24-2016, 06:41 PM | #3 (permalink) |
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Join Date: Feb 2007
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deleted.
Edit... I'd look at it like this. Do you ever leave lights on when not in the room? Or how about leaving electronics such as a cable box plugged in when not at home? Ever drive somewhere when you can walk? If so, that cost you more than what it costs to charge your devices
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