Battery Bussing [RE-wrenches]

[Kurt Nelson]

Joel wrote:

Question 3 - Will current flowing
> through any interconnect differ from any other? Question 4 - If batteries
are
> similar (same production batch and specific gravity) and cables and
connections
> are the same, under what conditions will interconnect current flow differ?

Hey Joel,

I don't know if I can answer this being that I asked the original question,
but I may be able to make the issue a little more clear.  Current flows
through the least path of resistance, so to keep from pulling more current
off one end of the battery than the other, the main cables are placed at
opposite corners of the battery pack (you weren't clear if this was the case
in the questions you posted).

It is in fact very similar to plumbing a solar thermal flate plate liquid
collector.  If you don't plumb the input and output to opposite corners of
the collector, the interconnecting tubbing inside the collector that is
closest to the piping receives more flow (wash) than the other end of the
collector.   Plumb it in from opposite corners and there is the exact same
distance/piping flow throughout the entire collector.  When a battery is
wired in from opposite corners, the flow through all bussing is even as
well.

I wanted to add a second inverter and place it on the opposite corners of
the battery from where the existing inverter is wired to get an even more
balanced draw on the battery, but as the seperate B- cables are bonded at
the shunt, it doesn't work out.   You end up with the inverters each drawing
off one end of the batery, though both from opposite ends.

Part of my question was that if the loads are somewhat balanced on the
inverters, and as the inverters are both used to charge the battery
periodically (at the same rates), is it still better to leave the cabling
for each inveter at their own opposite corners?

Sounds like no.  Perhaps this should only be done when doing dual SW's for
240 only.  Then they would be drawing very evenly off the entire battery.
The other time when this should be done is when using Trace's parallel
stacking interface kit?  Then they would also be drawing evenly.

Kurt Nelson

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