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Forum Index : Electronics : battery power

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irishron40
Senior Member

Joined: 22/09/2014
Location: Ireland
Posts: 254
Posted: 08:30am 21 Dec 2014
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Hello, can you please confirmthe following

i have a new car baterry 12 volt 830 amp and 95ah

i run garden led lights. all light together draw 2.5 amp

so that would be 10 amp in 4 hour

should i devide the 95ah by 10 to see how many days i can have them on for or is it the 830 devided by 10 amp a day?

maybe an easy question for you all, but I am still learning lol


thank you

ron
 
davef
Guru

Joined: 14/05/2006
Location: New Zealand
Posts: 499
Posted: 09:19am 21 Dec 2014
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830Amps sounds like the cranking current, so you don't want that.

So, 95Amps divided by 10A. Also, that 95Amp/hour rating is determined by the amount of current drawn, keywords discharge rate.

Also, search Battery University
 
irishron40
Senior Member

Joined: 22/09/2014
Location: Ireland
Posts: 254
Posted: 09:23am 21 Dec 2014
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thx davef
 
VK4AYQ
Guru

Joined: 02/12/2009
Location: Australia
Posts: 2539
Posted: 12:36pm 21 Dec 2014
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Hi Irishron

If you use the full 95 AH your battery will be fully discharged and that causes sever sulphation a few cycles at 100% discharge will reduce the capacity of your battery and a lot will destroy it.

As a rule of thumb with lead acid batteries to get a good life out of them it is wise to only discharge to 35 % of capacity so in your case only a bit over 30 AH and then fully recharge. That is on your figures 12 hours, so you would need t fully recharge daily to get a reasonably long life out of your battery.

All the best

Bob
Foolin Around
 
irishron40
Senior Member

Joined: 22/09/2014
Location: Ireland
Posts: 254
Posted: 05:21pm 22 Dec 2014
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thx bob. i might need to get a better dc motor that gives out more amp. we dont have continious winds here. it might give me 14 volts for 4 seconds and then wind drops again.
 
VK4AYQ
Guru

Joined: 02/12/2009
Location: Australia
Posts: 2539
Posted: 05:27pm 22 Dec 2014
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Hi Irishron

You may do better to invest in a solar cell as the sun is more reliable than the wind but the wind is a good backup.

All the best

Bob
Foolin Around
 
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