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1. 08:01 AM - Possible Z-14 error?? (Voyager)
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| Subject: | Possible Z-14 error?? |
Hi Bob,
I am looking at wiring my RANS S-21 based to a large degree on your Z-14 architecture.
As I am reviewing it and creating my schematics in SolidWorks, I noticed
something odd. I am looking at what I believe is the latest revision (dated
24-Jun-2013).
On P1, the wire from the cross-feed contactor to the main battery contactor is
2 AWG as compared to 4 AWG from the aux battery contactor to the cross feed.
Since both batteries are the same size, it seems these should be the same size
conductor unless the lengths are dramatically different.
The bigger question I have is why is the conductor on P2 from the main battery
contactor to the starter contactor 4 AWG when 2 AWG is used to the starter itself
from its contactor? Did the wire sizes from the main battery contactor to
starter contactor get transposed with the size from the cross-feed contactor
to the main battery contactor? Or is the assumption that the length from the
cross-feed contactor to the main battery contactor is long and the length from
the main battery contactor to the starter contactor is short?
I plan to mount my two batteries side by side with short runs from the batteries
to their contactors (hopefully less than 12") and short runs from the battery
contactors to the cross-feed contactor, again 12" or less if practical. My
batteries will likely be under the baggage compartment floor according to the
RANS plans which is not my favorite location, but the firewall is too crowded
and I really don't want to run clear back to the tail cone. This means that my
cable from the battery contactor to the starter contactor will likely be 6'
or more in length and then another 3-4 feet to the starter.
Given the above, I am leaning towards 4 AWG for the short runs between batteries
and main and cross-feed contactors and then 2 AWG from battery or cross-feed
contactor to the starter contactor and 2 AWG from starter contactor to starter.
However, this isn't what I see on your architecture diagram hence my question.
Although, RANS shows 4 AWG for everything from the battery to the starter
so maybe I am being overly conservative.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=503024#503024
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