Battery strings [RE-wrenches]

[Ray Walters]

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I agree with Hugh, that single strings are over rated and a single 
failure can be serious. However, I've definitely seen my share of 
problems from systems that over paralleled and didn't balance the 
cabling (pull from opposite corners) but I've seen fairly amazing life 
out of 4 parallel strings of golf cart batteries ( can you believe 10+ 
years) so its not bad. Also, I've seen large differences in battery SOC 
with systems with only a single series string.
I think if you really wanted to nail it, we would need battery 
monitoring and charging on each cell or small group of cells, that 
charges and maintains them independently. This is a reality in the 
Electrc Vehicle world and is necessary for newer battery chemistries 
like Lithium Ion.

Also Chris, when you said you had a pair of 4/o cables going to the 
batteries, wouldn't 10 Outback inverters combined exceed the ampacity of 
those 2 cables, or are there other considerations (such as out of phase 
current draws) I'm missing?

Ray Walters


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