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Mounting PC680 on firewall

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rvdave

Joined: 24 Jan 2009
Posts: 191

Posted: Sat Feb 16, 2013 12:27 pm Post subject: Mounting PC680 on firewall

Looking to mount second battery on firewall with aluminum tray from Hawker.  Thinking about letting bottom of tray/battery rest on engine mount with baffle material on mount.   Anyone foresee a problem or better location?

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_________________
Dave Ford
Cadillac, MI

Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Sat Feb 16, 2013 1:07 pm Post subject: Mounting PC680 on firewall

I'd never do it.

Tim

On Feb 16, 2013, at 2:27 PM, "rvdave" <davidbf(at)centurytel.net> wrote:



 	  Quote: 	
		   

 

 Looking to mount second battery on firewall with aluminum tray from Hawker.  Thinking about letting bottom of tray/battery rest on engine mount with baffle material on mount.   Anyone foresee a problem or better location?

 

 --------

 Dave Ford

 RV6 flying

 RV10 building

 Cadillac, MI

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=394420#394420

 

 

 

 

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carl.froehlich(at)verizon
Guest

Posted: Sat Feb 16, 2013 1:26 pm Post subject: Mounting PC680 on firewall

I modified the stock battery mount to hold two PC625 batteries (batteries

are mounted at 90 degrees to the axis of the plane (back to back with a 1/4"

spacer), and both are held down by the one stock battery clamp).  The PC625

has a little more CCA power than the PC680, a pound lighter and has a better

form factor for this application. 



The batteries normally operate in parallel, but are split in the event of a

component failure (e.g. alternator).  When split half the panel runs on the

one, the other half on the other, or both sides can run on one or the other

battery in the event a battery (or more likely master solenoid) itself

failed.



Carl



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robin(at)PaintTheWeb.com
Guest

Posted: Sat Feb 16, 2013 2:39 pm Post subject: Mounting PC680 on firewall

I'm with Tim. Keep it of the engine mount at a minimum. 

Here is my dual battery set up. I have a 3rd (smaller) battery that exclusively supports my D100 in case of a total electrical failure. 

  

Robin 

  

[img]cid:image003.jpg(at)01CE0C53.40C38F60[/img] 

  

  

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rvdave

Joined: 24 Jan 2009
Posts: 191

Posted: Sun Feb 17, 2013 4:36 pm Post subject: Re: Mounting PC680 on firewall

I know that vans sells a firewall mount for the PC680, wondering if anyone has used that or another mount and where it is located?

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Dave Ford
Cadillac, MI

jkreidler

Joined: 13 Feb 2008
Posts: 151
Location: Sheboygan Falls WI

Posted: Mon Feb 18, 2013 5:33 am Post subject: Re: Mounting PC680 on firewall

Dave, just a comment about letting the battery box rest on the engine mount.  Consider that over time dirt and oil will work its way into the interface between the box and the engine mount.  This slurry under pressure does a good job of sanding away at your engine mount.  This situation is a bit different than using cushion clamps to hold something to the engine mount because the firewall and engine mount flex differently so there is more potential for relative movement.  I would favor just mounting the box to the firewall, maybe with a backing plate to help reinforce.  I have no first hand experience with mounting a battery on the firewall, but the practice is common in two seat RV's.  Consider heat, and vibration as cons, cable length and weight as pros.  No comment from me on W&B as I have no idea what else is being installed and where.  It is worth while to run a W&B calc based on the two locations and see what difference it will make.



Thanks - Jason

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Jason Kreidler
4 Partner Build - Sheboygan Falls, WI
Tony Kolar, Kyle Hokel, Wayne Elser, Jason Kreidler
N44YH - Flying - #40617

Kelly McMullen

Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ

Posted: Mon Feb 18, 2013 6:36 am Post subject: Mounting PC680 on firewall

I've been watching this discussion and wondering......having stuff on the firewall, more than absolutely required seems to be undesirable, both in limiting access to work on changing oil filter and maintaining the magnetos, and would not seem to be an advantage for W&B given that the original plans give a c.g.range that works. Maybe if extra stuff like air conditioning is going in the back it might be helpful.

 I've just worked on two many planes that you have to remove the battery box from firewall to be able to service a magneto, etc. Granted the PC680 is smaller, but I still think it would be a maintenance annoyance.



 On Mon, Feb 18, 2013 at 6:33 AM, jkreidler <jason.kreidler(at)regalbeloit.com (jason.kreidler(at)regalbeloit.com)> wrote:

[quote] --> RV10-List message posted by: "jkreidler" <jason.kreidler(at)regalbeloit.com (jason.kreidler(at)regalbeloit.com)>

 

 Dave, just a comment about letting the battery box rest on the engine mount.  Consider that over time dirt and oil will work its way into the interface between the box and the engine mount.  This slurry under pressure does a good job of sanding away at your engine mount.  This situation is a bit different than using cushion clamps to hold something to the engine mount because the firewall and engine mount flex differently so there is more potential for relative movement.  I would favor just mounting the box to the firewall, maybe with a backing plate to help reinforce.  I have no first hand experience with mounting a battery on the firewall, but the practice is common in two seat RV's.  Consider heat, and vibration as cons, cable length and weight as pros.  No comment from me on W&B as I have no idea what else is being installed and where.  It is worth while to run a W&B calc based on the two locations and see what difference it will make.

  

 Thanks - Jason

 

 --------

 Jason Kreidler

 4 Partner Build - Sheboygan Falls, WI

 Tony Kolar, Kyle Hokel, Wayne Elser, Jason Kreidler

 N44YH - Flying - #40617

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=394484#394484

 

 

 

 

 

 

 

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Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD

arplnplt(at)gmail.com
Guest

Posted: Mon Feb 18, 2013 6:39 am Post subject: Mounting PC680 on firewall

I use the BC100-1 from B&C Specialty products.  Stand it on its side in the standard Van's try with no modification.Plenty of power.



 David Leikam

RV10





 

 

On Feb 18, 2013, at 7:33 AM, jkreidler wrote:

[quote]--> RV10-List message posted by: "jkreidler" <jason.kreidler(at)regalbeloit.com (jason.kreidler(at)regalbeloit.com)>



Dave, just a comment about letting the battery box rest on the engine mount.  Consider that over time dirt and oil will work its way into the interface between the box and the engine mount.  This slurry under pressure does a good job of sanding away at your engine mount.  This situation is a bit different than using cushion clamps to hold something to the engine mount because the firewall and engine mount flex differently so there is more potential for relative movement.  I would favor just mounting the box to the firewall, maybe with a backing plate to help reinforce.  I have no first hand experience with mounting a battery on the firewall, but the practice is common in two seat RV's.  Consider heat, and vibration as cons, cable length and weight as pros.  No comment from me on W&B as I have no idea what else is being installed and where.  It is worth while to run a W&B calc based on the two locations and see what difference it will make.



Thanks - Jason



--------

Jason Kreidler

4 Partner Build - Sheboygan Falls, WI

Tony Kolar, Kyle Hokel, Wayne Elser, Jason Kreidler

N44YH - Flying - #40617





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=394484#394484



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