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robintaylor
Joined: 25 Apr 2013
Posts: 7
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 Posted: Fri Sep 15, 2017 7:13 am Post subject: Dual batteries |
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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.
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matronics(at)rtist.nl
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| Posted: Fri Sep 15, 2017 7:39 am Post subject: Dual batteries |
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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:
| Quote: |
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
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robintaylor
Joined: 25 Apr 2013
Posts: 7
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| Posted: Fri Sep 15, 2017 8:28 am Post subject: Re: Dual batteries |
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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.
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user9253
Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
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| Posted: Fri Sep 15, 2017 8:54 am Post subject: Re: Dual batteries |
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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.
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