Questions tagged [ampere-hour]

A unit of battery capacity configured for easy calculation. The SI corresponding unit is Coloumb ( unit of "C") which is a measurement of charge. A=C/s (A=Amps) so A*hour are dimensionally similar with a scale factor of 60*60=3600. This roughly tells you how much current a battery will supply for how long. Note that this is an estimate of the total power delivered, the voltage of the battery will vary with current level as well as charge level.

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Batteries in series with different amp-hour ratings.

I have a 1.5 amp-hour, 12 V battery and I have a 10 amp-hour 12 V battery. I know the voltage will increase to 24 V when they are put in series, but I don't know what goes on amp-hour wise. Does the ...
5k views

Watts - I think I'm getting free energy from a circuit?

Imagine I have a 10V battery with a capacity of 1Ahrs connected to a 100 Ohm resistor. I'll get 0.1A (V/R) at a power of 1W (current x voltage) for a total of 10hrs. As a watt is defined as J/s my ...
39k views

Battery Ampere-hour rating vs Battery Amps (not an experienced user)

I have almost no experience whatsoever with the technicals of electronics so this is probably a very easy question for someone who does. Do you know if a battery with a 200Ah rating can put out 200A ...
3k views

Do buck converters increase the amp hours of a battery?

I've read that they are 90% efficient compared to linear regulators so given the relationship between volts and amps and I want to power the project off of a 12v battery that has 18Ah and is charged ...
985 views

What is the 'continuous standard load' of a battery?

I'm currently integrating a coin cell power design into an electronics project. I am trying to verify my understanding of the 'continuous standard load' rating given for a battery (datasheet) When ...
12k views

(Capacity 20hr: 65AH) Does this mean 65amps per hour for up to 20 hours?

Cranking Amps: 675 Im trying to find a good battery for a project. That part where it says "20hr" keeps making me rethink what i sorta hope it means.
3k views

Determine the amp hour rating of a home made battery pack

I'm thinking of making my own electric bicycle, and I need help determining what the amp hour rating of my battery pack would be. I'm going for 36v and 8 or 9 amp hours. So, with 10 batteries in ...
4k views

How much AH should my battery has for my sound system (3 Amplifiers)?

I would like to know if I can mount my sound system in my car. My current battery is 45AH, and the problem is that I can't go higher than a battery with 50AH, because there isn't space for it on the ...
55 views

How to calculate battery ratings for your solar panel?

If I want to choose a battery for my solar panel which is required to run a load of 5 kWh/day. Then I will be needing a battery with a rating of above 23 ampere hours since 5 kWh/220 V (since 220 V we ...
164 views

What is the basic definition of an amp-hour?

What's the basic definition of an amp-hour? For example: A 12V battery is rated at 100Ah. Does this mean that the battery will be discharged in 1 hour if the load is 100A@12V? Thanks.
100 views

How to find how many Amperes does a equipment use? [closed]

In the specification of this miner https://www.asicminervalue.com/miners/bitmain/antminer-s9j-14-5th it says it uses 1350W power with ...
1k views

Smallest Magnetic Relay and how to choose the Ampere rating [closed]

I am building an automation system, where I don't have much space, so I require really small relays, 3.3 or 5 VDC controllable relays. I need to connect it to say a lamp, or a fan, equipment's that ...
78 views

Can not find or calculate ampere hour from the data sheet

Here is the data sheet of a ups: http://www.ups-service.by/PDF/Technical_Specification_PowerWave_60-500kW_English.pdf How long for a nominal 500A current drawing load would this utility last? How ...
8k views

calculate Amp Hours when voltage is given

I'm trying to wrap my head around how exactly Amp Hours work. I have been trying to figure out this question for a while now, but can't seem to find the information that I need. This is the circuit, ...
59 views

coulomb and ampere calculation reg

when I am reading the IC datasheet ,operating voltage is they were mentioned 5v,300mA.its means 300mA per sec/min/hour. Because I have to calculate battery power for a circuit. 1 coulomb= 1 ampere. ...
866 views

If I convert 10 V, 1 ampere to 5 V, do I get 5 V 2 ampere?

I know the current in the circuit is the same. And also, Power = 10* 1 = 10 watts. So, 10 = 5 V * (x) ampere, X = 10/5, X = 2 ampere, With some loss while using a voltage regulator, I will ...
84 views

Simple question about power usage

My question is simple for humans but hard to search for in Google or somewhere else, so forgive me if this isn't the best place to ask. I was looking up the power consumption of an electronic device ...
1k views

What should be the watts of solar panel and battery size

I want to light one 70watt bulb for 12 hours at night time. I want to know what should be the Watts of the solar panel and how much Ah battery will I require? I searched many of the questions here ...
552 views

Figuring out battery life from amp draw?

I decided to take apart one of those cheap handheld fans. It takes 2AA Alkaline batteries. I wanted to hook it up to an arduino as a way to get into electronics, and I wanted to know what kind of ...
12k views

9.5 ah replaced with a 8ah battery? [closed]

I'm trying to replace two Data Safe NPX-35, 12V, 8.5Ah SLA batteries. When I called support to figure out what to order (before pulling the actual batteries out) they said that any 12V 9Ah SLA would ...
123 views

Mistake in calculating the last time of battery (Ampere hour problem)

I've a question about the mAh rating of batteries. At the Dutch Wiki page of Ampère-uur which is the Dutch word for Ampere hour, they say for example a $100$ Ah battery can supply 5 A for 20 hours ...
62 views

Is there a reason why lower voltage batteries are preferred for high AH?

I was looking at these batteries and considering whether to use a 12V battery or multiple 2V batteries for backup power. In any case, I came across this battery by Exide Tech - GNB Flooded Classic H1T ...
388 views

Is lithium battery charging speed proportional to the amps provided from the power source?

An interesting fact I came across recently - electric kettles in the US run at double the time for other countries - due to the US adopting a 110V power system. (And electrical kettle boiling duration ...
3k views

Calculating mAh needed to run a device

I've got 15 devices each with a current of 20mA and I am interested in running them all for 10 seconds. How would I go about working out the amount of mAh a battery would need to provide for this? I ...
5k views

Battery power required for a 2HP Motor AC at 1800 rpm, 56Hz?

So I will be using an Inverter to convert DC(12V) to AC(220v)(50Hz). The 2HP*(746w) = 2.3 kW / .85 power factor = 2.7 kW / 220V = 12.27A If I want it to run for 5 hours that's 62 Ah. Can I use a ...
616 views

Does Amp Hour Rating Take Into Account Voltage Drop Relative to State of Charge?

I'm looking at buying batteries, either 12v AGM or LI-Ion, for use in a backup power system. I have a choice between a Lifeline 8D AGM battery rated at 255 Ah @ 20 hr, or a Victron LI-Ion rated at 160 ...
338 views

Lead Acid Battery Charge C/20Ah

I need to charge a lead acid battery, I will be manually developing a program to set the current. Its the "US 12V XC2" Deep Cycle battery. Here is a link to the datasheet: http://usbattery.com/wp-...
45 views

Calculate 100mAH battery with active and inactive value

A battery-powered remote wireless sensor uses 10 mA when active, 10 uA when inactive. How long will it run on a 100 mAh battery when it is: active for 10 seconds once per hour active for 10 seconds ...
104 views

What happens when Amperes hour (Ah) and voltage regulation go together to the party?

This is the first time I ask on the Electrical Engineering site of Stack Exchange, please feel free to dismember my question. Please take into account: I am thinking about the hypothetical ideal case ...
812 views

Converting battery capacity from Ah to Wh: Which voltage should be used?

I need to convert the battery capacity from ampere-hours to be Watt hours. I know that $P=VI$ in Watts, however I'm unsure of which voltage I will need to use in order to use this relation; there ...