Re: (ET) batteries

["David Roden (Akron OH USA)" <etpost drmm net>]

On 5 May 2011 at 17:31, Ferguson Apiaries wrote:

> A 12v 200ah battery is that equal to 4 6v 100 ah batteries.

At the 20 hour rate (C20), where the above specs are determined, that 
would 
be true in the most direct case.

24 * 100 = 2400Wh

6 * 100 * 4 = 2400Wh

12 * 200 = 2400Wh

However, you would want to pay attention to the relative capacities at the 
discharge rate you planned to use.  (This is what Christopher Zack is 
alluding to.)  

Be aware that if you plan to use the 6v batteries in series/parallel, they 
might not share the current equally, especially as they age.  This can 
have 
an effect on the actual usable Wh capacity.

Another rule of thumb : if the batteries weigh about the same in total, 
their capacity will usually be pretty similar.  That is, if your four 6v 
batteries weigh about as much as  your one 12v battery, they'll have about 
the same capacity.