Today's Message Index:
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1. 08:14 AM - Dual batteries (robintaylor)
2. 08:39 AM - Re: Dual batteries (Rob Turk)
3. 09:28 AM - Re: Dual batteries (robintaylor)
4. 09:55 AM - Re: Dual batteries (user9253)
Message 1
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In the UK we can now obtain certification to fly home builds under IFR.
There are quite strict requirements to achieve this.
I want to install a second battery in my RV9 to improve redundancy in the event
of an alternator failure.
My current battery is a Concorde RG-25XC and I would like the second battery to
be an Odyssey PC680.
I specify these because I had trouble starting my RV and changed from the Odyssey
to the larger capacity Concorde, but I still have the battery and battery holder
in the plane.
My questions are,
Is it OK to run two different AH batteries in parallel.
Is it OK to connect the second battery via another solenoid activated by the master
switch or is there a better way.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=472905#472905
Message 2
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Subject: | Re: Dual batteries |
Just putting batteries in parallel doesn't do much for redundancy. If
one develops a short, your backup will be toast too. You may want to
consider a further redesign of your electrical system in order to have a
true main and backup/essentials battery.
Not sure if you are weight constrained, but you could consider an
AeroAkku LFP-450D. It's identical in size to the PC680 and weighs 5kg
less than a PC680
On 9/15/2017 5:13 PM, robintaylor wrote:
>
> In the UK we can now obtain certification to fly home builds under IFR.
> There are quite strict requirements to achieve this.
> I want to install a second battery in my RV9 to improve redundancy in the event
of an alternator failure.
> My current battery is a Concorde RG-25XC and I would like the second battery
to be an Odyssey PC680.
> I specify these because I had trouble starting my RV and changed from the Odyssey
to the larger capacity Concorde, but I still have the battery and battery
holder in the plane.
> My questions are,
> Is it OK to run two different AH batteries in parallel.
> Is it OK to connect the second battery via another solenoid activated by the
master switch or is there a better way.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=472905#472905
>
>
Message 3
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Subject: | Re: Dual batteries |
Thanks for quick reply.
I think I should have said endurance not redundancy.
I am trying to do as little as possible and alternator failure is what they consider
the main risk so battery endurance is what key.
Regarding the batteries, I am light up front because I only have a wooden Cato
prop but I will look at the batteries.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=472907#472907
Message 4
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Subject: | Re: Dual batteries |
Yes, it is OK to put two different sized lead-acid batteries in parallel.
It is also OK to to install another solenoid. It could be energized via the master
switch. But I would use a separate switch.
You might consider installing a backup alternator (Z-13/8) instead of a second
battery. Two batteries still have limited endurance. A second alternator gives
unlimited endurance, maybe with less weight than adding another battery.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=472908#472908
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