Hi Charlie
The ACR activates on voltage, so unless your jump pack is higher than
13v it won't combine the banks. I seriously doubt it, but you could
test it: with charging sources off and the switch in the "normal"
position, verify that the ACR isn't active (there is an output on it
that you can connect to an indicator LED, check for voltage there, no
volts = inactive). Hook the jump pack to the start battery, wait a few
minutes, and re-check the output for the LED.
Graham Collins
Secret Plans
C&C 35-III #11
On 2020-07-14 6:26 p.m., Charlie Nelson via CnC-List wrote:
Following suggestions on this list, I purchased a NOCO Lithium battery
'jump starter' to have on board if/when I might need to jump my
starting battery. Cheaper and lighter than another 12 volt battery and
having done this many times in various cars I have owned over the
years, it is no big deal to jump a dead battery.
However, my boat has an ACR which, as I understand it, works to keep
the batteries charge states more or less equal while they are being
charged, either from shore power or the alternator. When no external
charge is supplied, it isolates the battery banks. So if it works as
it should, and my house batteries are drained accidently or just fail
while at anchor (say), I should be able to use the start battery to
start the engine. In fact, my battery switch has 2 positions (besides
OFF), 1 (Normal) and Combine Batteries. Unless both battery banks fail
at the same time, I think I would always have on board power to start
the engine. In the very unlikely event that I lose both battery banks,
my NOCO might save the day.
So here is the question in this unlikely scenario:
When I jump start the engine, do I hook up the NOCO jump starting
battery to the 'start battery' in the boat? If the ACR has not failed,
would it not sense the increased charge state of the boat start
battery and immediately share the NOCO jump star power with the house
batteries? If these are also depleted, my NOCO jump starter might not
have enough power to start the engine, since the ACR would send a lot
of this power to the house batteries.
If the above is not 'over thought', it suggests that I should isolate
the house batteries from the ACR before I try to jump the boat start
battery with the NOCO jump starter.
Thoughts from the list would be appreciated!
Charlie Nelson
Water Phantom
1995 C&C 36 XL/kcb
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every one is greatly appreciated. If you want to support the list - use PayPal
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