Paralleling Battery Banks [RE-wrenches]

William Miller wrmiller at charter.net
Sun Dec 31 10:20:43 PST 2006


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Hugh:

This is a very significant point you have raised.  In the past I might have 
been a bit cavalier about opening battery breakers, but no more!  I have 
drafted a warning sign that will remain in memory in my label printer.

I always find something illuminating in your posts.  Thank you.

William Miller


At 12:02 AM 12/31/2006, you wrote:

>Take care that pulling a fuse will not leave the charging sources 
>connected to the inverter and controls without any battery.  I would use a 
>separate fuse(s) for any charging sources, so that this is not 
>possible.  A wind or hydro turbine that shares a fuse with the inverter 
>can be a source of dangerously high voltage if the fuse is pulled.  Charge 
>controllers may or may not be able to deal with the turbine output in the 
>absence of batteries.  I am not sure about PV but I would imagine that the 
>same problem would arise to a lesser extent (lower open circuit voltage).
>
>I guess if you put a separate inverter fuse on each battery string, then 
>you need multiple fuses for the charging sources as well.  Or else place a 
>conspicuous sign indicating the dangers of pulling out all the battery fuses.
>--
>Hugh
>
>Scoraig Wind Electric
>http://www.scoraigwind.co.uk/


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