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How Big is Your Battery Bank scaled to 12 volts

7 amphours or less   5 votes - 1 %
8 to 30 amphours   13 votes - 3 %
31 to 75 amphours   17 votes - 4 %
76 to 150 amphours   35 votes - 9 %
151 to 300 amphours   53 votes - 14 %
301 to 500 amphours   30 votes - 8 %
501 to 1000 amphours   60 votes - 16 %
over 1000 amphours   98 votes - 26 %
Still Planning System   51 votes - 13 %
Not Planning a System   10 votes - 2 %
 
372 Total Votes
How Big is Your Battery Bank scaled to 12 volts | 17 comments
Re: (3.00 / 0) (#1)
by DamonHD (d@hd.org) on Mon Jul 21st, 2008 at 01:37:43 AM MST
(User Info) http://www.earth.org.uk/

I'm assuming that this is at 12V?

Rgds

Damon



Re: (3.00 / 0) (#2)
by dbcollen on Mon Jul 21st, 2008 at 09:41:03 AM MST
(User Info)

I have 1170 AH @ 20 hr rate @ 48VDC

Dustin
Mad River Wind and Hydro
[ Parent ]



Re: (3.00 / 0) (#3)
by veewee77 on Mon Jul 21st, 2008 at 11:58:12 AM MST
(User Info)

It doesn't matter what the voltage is. amp/hours is amp/hours.

Mind you, though that 100A/H at 12V won't run as long as 100A/H at 48V given the same wattage of load.

a 10 watt light on the 12V system uses .83A for slightly less than 100 hours in a perfect world with a 100A/H battery.

The same 10 watt light on a 48V system uses .21A for slightly less than 400 hours in a perfect world with a 100A/H battery.

Doug

[ Parent ]



Re: (3.00 / 0) (#4)
by SparWeb (sparweb at ANTISPAM_hotmail_com) on Mon Jul 21st, 2008 at 12:41:52 PM MST
(User Info)

Veewee: Wrong.

If you have a string of four 12V batteries in a row, each rated at 100 AH, then your 48V system has 100 AH capacity.

If you take the same batteries, hook them all up in parallel to each other, then you have a 12V battery bank, with 400 AH capacity.

Please read the question more carefully before answering.

Steven Fahey
[ Parent ]



Re: (3.00 / 0) (#5)
by mixerman on Mon Jul 21st, 2008 at 03:17:33 PM MST
(User Info)

I have 1 battery that has 750 cold cranking amps, I dont know how this relates to amp hours. Proper batterys will come later, will probely be used ones. Got some learning to do.


Re: (3.00 / 0) (#6)
by DanB (danb@*no spam*otherpower.com) on Mon Jul 21st, 2008 at 03:51:01 PM MST
(User Info) http://www.otherpower.com/

cold cranking amps has nothing to do with Amp Hour capacity.  CCA reflects how many amps can actually be drawn from the battery but it doesnt have anything to do with time.  

[ Parent ]


Re: (3.00 / 0) (#7)
by wooferhound (tim((NoSpamAt))wooferhound.com) on Mon Jul 21st, 2008 at 05:30:01 PM MST
(User Info) http://wooferhound.com

Perhaps I should have said WattHours but that may have confused everybody ?
W o o f -={(


Re: (3.00 / 0) (#8)
by wooferhound (tim((NoSpamAt))wooferhound.com) on Tue Jul 22nd, 2008 at 06:08:11 AM MST
(User Info) http://wooferhound.com

There have been so many newbies that talked about their 7ah battery. Where are those people ?
W o o f -={(


Re: (3.00 / 0) (#9)
by AbyssUnderground on Wed Jul 23rd, 2008 at 01:42:31 PM MST
(User Info) http://www.repowered.co.uk

12v 90Ah @ 20hr rate

http://www.repowered.co.uk - My Renewable Energy site.
msn[at]m3ezw.co.uk - my msn if you want a chat.


Re: (3.00 / 0) (#10)
by wooferhound (tim((NoSpamAt))wooferhound.com) on Wed Jul 23rd, 2008 at 03:50:22 PM MST
(User Info) http://wooferhound.com

Also
Where are all those guys that are just charging AAA batteries and Cell Phone batteries? Somehow I was sure that the 'under 7ah' answer would have been clicked a lot more.
W o o f -={(


Re: (3.00 / 0) (#12)
by SparWeb (sparweb at ANTISPAM_hotmail_com) on Thu Jul 24th, 2008 at 05:15:08 PM MST
(User Info)

Woof,
Just like polls about hand cream and dishwasher soap, every poll is subject to error due to the nature of who is more likely to answer, and who is not.  The guys charging disposable batteries may not even realize the question could apply equally to them at all.  No matter how you phrase the question.
I hated sociology in college.
I had to get that off my chest.
Steven Fahey
[ Parent ]


Re: (3.00 / 0) (#13)
by wooferhound (tim((NoSpamAt))wooferhound.com) on Thu Jul 24th, 2008 at 10:59:46 PM MST
(User Info) http://wooferhound.com

I was thinking it was just because nobody wanted to admit to charging such small batteries
W o o f -={(

[ Parent ]


Re: (3.00 / 0) (#14)
by independent on Fri Jul 25th, 2008 at 12:24:01 AM MST
(User Info)

Yeah, I thought so too. It's a bit of mines-bigger-than-yours poll. I have a 7Ah battery which I use in a solar set up so I voted. Maybe once others see a vote they will join in too.
(I do have a nice NiFe 100Ah waiting for me to make a controller and buy some panels for =)

[ Parent ]


Re: (3.00 / 0) (#15)
by ghurd on Sat Jul 26th, 2008 at 03:21:43 PM MST
(User Info)

I wasn't sure which one to pick, 4 systems from 7 to 550.
Two only run sometimes, when the batteries get low.
The 550 changes from 440 to 660, depending on the situation that week.

Not including AAs on stepper motors or mini-PVs. :)
G-

[ Parent ]



Re: (3.00 / 0) (#11)
by jacobs on Wed Jul 23rd, 2008 at 06:38:17 PM MST
(User Info)

440 AH at 144 volts = 63.36 KW

OR

5,280 AH at 12 VDC



Re:amp hrs (3.00 / 0) (#16)
by tanner0441 on Sun Jul 27th, 2008 at 04:31:30 PM MST
(User Info)

Interesting reading.

Having just retired as a marine electrician, I could only get hold of deep cycle batteries, which as it happens is good... I have a 95AH I use as a test battery on various projects, and on my car a 110AH ( well it is a 2.5ltr diesel) I can still buy these 110AH batteries at cost price so guess what I will be using.

As where I live in the UK I am very sheltered for wind, I will probably go for PV at least it gets light every day and I have a south facing roof.

We have been told in the UK to expect our utility prices to go up by up to 60% in the next 2 years.  So what was just an interest now has real value.

Regards

B G S

[ Parent ]



Re: (3.00 / 0) (#17)
by bahnfeldt (bahnfeldt500883@alliance.co.nz) on Sun Aug 17th, 2008 at 04:46:45 AM MST
(User Info)

my systems for a family are 900amp hours at 24 volts
tried living off less and waster of time not enough storage,
when storing solar energy
how amp hours do the hydro guy iive off with a good system


How Big is Your Battery Bank scaled to 12 volts | 17 comments
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