Tom,
Sorry, I failed to write clearly. I was not talking about bus bars in
this sentence. I meant to say that I 'daisy chain' links from one
string to the next. I parallel them by connecting A to B, B to C, C
to D. Then I connect positive of A to the inverter, and negative of
D to the inverter. In this way the connections are all balanced
without the use of a bus bar. You can connect the positive of D to
the wind turbine (and the negative of A) to reduce the danger of a
direct connection without batteries.
If a battery is well charged I see no problem with parallel strings.
As it gets older then you do need to monitor the individual
cells/units for failures and take action. Standard smaller sized
units are easier to re-group, and if desired to replace.
Tom wrote:
"If you connect links between all of the positives, and links
between all of the negatives,
to parallel the battery, then the only issue is where you connect
the charge source and/or inverter."
Hugh,
The connection is very easy, if you look at the photos on the page I
linked to the connections to the inverter breaker (which is where I
also connected the charge source) come off the bus bars. It's
actually a very simple installation and I found it much easier and
safer to work on that a large series/parallel bank of L-16s, which
was what my first bank in that system consisted off and it turned
out to be a mess (designed and the components built by Jade
Mountain...)
Tom
--------------------------------------------------
From: "Hugh" <[email protected]>
Sent: Thursday, December 03, 2009 8:30 AM
To: "RE-wrenches" <[email protected]>
Subject: Re: [RE-wrenches] Strings and series of batteries
Just for a contrasting opinion:
I rarely use grease or vaseline unless it proves necessary. I have
changed out battery banks after seven years and the connectors are
still pristine whilst dry. I agree that sometimes there will be
localised corrosion on battery terminals. I find it rarely, and I
deal with it as and when. I might use vaseline then. Or spray on
some oil. Not a big deal to be honest. The contact resistance is
not affected by corrosion on the outside. Probably due to some
moisture arriving on the terminal? But vaseline/grease attracts
dust, makes a big mess and mess is not nice around batteries.
Bus bars sound great, but what a hassle. If you connect links
between all of the positives, and links between all of the negatives,
to parallel the battery, then the only issue is where you connect the
charge source and/or inverter. I have learned to connect them at
opposite ends of the parallel links. 'Diagonally opposite' you could
call it. In this way the resistance is identical to each string.
One string has a direct connection to plus. One has a direct
connection to minus. All have equal number of links between them and
the inverter. If there is a wind turbine then I will often connect
this to two corners and the inverter to the opposite two corners,
making it very difficult to (both) disconnect the battery and (also)
leave the wind turbine connected to the inverter. This probably has
saved a few inverters from instant death due to carelessness.
--
Hugh Piggott
Scoraig Wind Electric
Scotland
http://www.scoraigwind.co.uk
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Hugh Piggott
Scoraig Wind Electric
Scotland
http://www.scoraigwind.co.uk
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