Today's Message Index:
----------------------
1. 04:58 AM - Auxiliary Battery (Greg McFarlane)
2. 05:47 AM - Re: Auxiliary Battery (Lenard Iszak)
3. 06:40 AM - Re: Auxiliary Battery (Charlie England)
4. 07:36 AM - Re: Auxiliary Battery (Richard McBride)
5. 09:51 PM - Re: Auxiliary Battery (Robert Jones)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Auxiliary Battery |
Planning a Dual Electronic Ignition for the RV10 and looking at the options for
charging an Auxiliary Battery. This is a single Alternator, single main/cranking
Battery system. Looks like the simplest charging system for the Auxiliary
(apart from the integrated battery units like TCW etc) is using a VSR (voltage
sensitive relay) The one Im looking at is a very compact unit that cuts in at
13.2volts and cuts out at 12.8volts. Is anyone using a VSR like that ? and has
it been satisfactory ? .... Or any other ideas appreciated.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502064#502064
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Auxiliary Battery |
I used a VSR early on. Two versions, a BlueSea and then an australian one. They
both had a pretty bad parasitic draw. Removed it and installed a Xantrex charger
instead and that worked well. I used Panasonic SLA batteries and when I tested
them every year they needed to be swapped out. The last set I was trying
to buy at BatteriesPlus were almost completely discharged. They were basically
abused before sold. A lot of batteries are.
For the last couple of years Ive been using two TCW batteries, a 6A one for the
Efis screens and an a 3A one for the Lightspeed ignition. Im finally happy with
that setup and feel its safe to rely on if needed. Its a very well thought
out design and now they sell replacement battery packs too.
Lenny
> On May 27, 2021, at 8:07 AM, Greg McFarlane <grbcmcfarlane@gmail.com> wrote:
>
>
> Planning a Dual Electronic Ignition for the RV10 and looking at the options for
charging an Auxiliary Battery. This is a single Alternator, single main/cranking
Battery system. Looks like the simplest charging system for the Auxiliary
(apart from the integrated battery units like TCW etc) is using a VSR (voltage
sensitive relay) The one Im looking at is a very compact unit that cuts in
at 13.2volts and cuts out at 12.8volts. Is anyone using a VSR like that ? and
has it been satisfactory ? .... Or any other ideas appreciated.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=502064#502064
>
>
>
>
>
>
>
>
>
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Auxiliary Battery |
On Thu, May 27, 2021 at 7:03 AM Greg McFarlane <grbcmcfarlane@gmail.com>
wrote:
m
> >
>
> Planning a Dual Electronic Ignition for the RV10 and looking at the
> options for charging an Auxiliary Battery. This is a single Alternator,
> single main/cranking Battery system. Looks like the simplest charging
> system for the Auxiliary (apart from the integrated battery units like TC
W
> etc) is using a VSR (voltage sensitive relay) The one I=99m lookin
g at is a
> very compact unit that cuts in at 13.2volts and cuts out at 12.8volts. Is
> anyone using a VSR like that ? and has it been satisfactory ? .... Or any
> other ideas appreciated.
>
> It's kinda hard to make a solid recommendation without knowing how you're
using the aux battery. The simplest thing to do to isolate a battery that
is 'offline' in normal use is to use a Schottky
<https://en.wikipedia.org/wiki/Schottky_diode> power diode between the
regular bus and the battery positive. The Schottky has lower forward
voltage drop than a regular diode, and as the battery nears full charge,
the voltage drop across the diode diminishes to as low as 150 mV. If the
aux battery has no loads attached in normal operation, it will eventually
fully charge and stay charged, as long as your bus is at the proper level
for charging normal SLA batteries (~14-3-14.7V).
The diode itself will prevent the battery from powering the bus, but you
must manage how the load(s) connect to the aux battery. If you simply add a
tie to the desired equipment, without isolating the equipment from the bus,
then activating the tie will allow the aux battery to power the bus. Some
equipment (ex: GRT & some other EFIS brands) provide multiple
diode-isolated power inputs. In cases like that, the aux bat would come
online automatically if bus power is lost, but the device would remain
powered up after you intentionally power down the bus so you'd have to
remember to turn off the device manually after your normal shutdown process
at the end of the flight.
Have you looked at all the info in the Aeroelectric Connection book and 'Z
figures'?
Charlie
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Auxiliary Battery |
Lightspeed provides the below wiring scheme for a dual battery solution. Th
e second battery is isolated to run one ignition. That battery is isolated v
ia the Schottky diode Charlie discusses below. I did this on my -8 and it h
as worked flawlessly for 1000 hours. I got a very nice diode from Perihelio
n Design (https://periheliondesign.com/ ), that we put in our -10 project. U
nfortunately, it appears they no longer carry the diode. But it might be wo
rth checking with them to see if they can provide one.
http://lightspeed-aero.com/Manuals/PS_Diagram.htm
Rick
> On May 27, 2021, at 7:46 AM, Charlie England <ceengland7@gmail.com> wrote:
>
> =EF=BB
>
>
>> On Thu, May 27, 2021 at 7:03 AM Greg McFarlane <grbcmcfarlane@gmail.com> w
rote:
m>
>>
>> Planning a Dual Electronic Ignition for the RV10 and looking at the optio
ns for charging an Auxiliary Battery. This is a single Alternator, single ma
in/cranking Battery system. Looks like the simplest charging system for the A
uxiliary (apart from the integrated battery units like TCW etc) is using a V
SR (voltage sensitive relay) The one I=99m looking at is a very compa
ct unit that cuts in at 13.2volts and cuts out at 12.8volts. Is anyone using
a VSR like that ? and has it been satisfactory ? .... Or any other ideas ap
preciated.
>>
> It's kinda hard to make a solid recommendation without knowing how you're u
sing the aux battery. The simplest thing to do to isolate a battery that is '
offline' in normal use is to use a Schottky power diode between the regular b
us and the battery positive. The Schottky has lower forward voltage drop tha
n a regular diode, and as the battery nears full charge, the voltage drop ac
ross the diode diminishes to as low as 150 mV. If the aux battery has no loa
ds attached in normal operation, it will eventually fully charge and stay ch
arged, as long as your bus is at the proper level for charging normal SLA ba
tteries (~14-3-14.7V).
>
> The diode itself will prevent the battery from powering the bus, but you m
ust manage how the load(s) connect to the aux battery. If you simply add a t
ie to the desired equipment, without isolating the equipment from the bus, t
hen activating the tie will allow the aux battery to power the bus. Some equ
ipment (ex: GRT & some other EFIS brands) provide multiple diode-isolated po
wer inputs. In cases like that, the aux bat would come online automatically i
f bus power is lost, but the device would remain powered up after you intent
ionally power down the bus so you'd have to remember to turn off the device m
anually after your normal shutdown process at the end of the flight.
>
> Have you looked at all the info in the Aeroelectric Connection book and 'Z
figures'?
>
> Charlie
>
>
>
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Auxiliary Battery |
I might consider a standby alternator from B and C that mounts on the vacuum pump
pad. I personally dont like electronic ignition systems that are dependent
on ships power. I installed the P-Mags on my 10 because they generate their own
power.
Robert Jones
> On May 27, 2021, at 5:02 AM, Greg McFarlane <grbcmcfarlane@gmail.com> wrote:
>
>
> Planning a Dual Electronic Ignition for the RV10 and looking at the options for
charging an Auxiliary Battery. This is a single Alternator, single main/cranking
Battery system. Looks like the simplest charging system for the Auxiliary
(apart from the integrated battery units like TCW etc) is using a VSR (voltage
sensitive relay) The one Im looking at is a very compact unit that cuts in
at 13.2volts and cuts out at 12.8volts. Is anyone using a VSR like that ? and
has it been satisfactory ? .... Or any other ideas appreciated.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=502064#502064
>
>
>
>
>
>
>
>
>
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|