You're boat is wired wrong or you are misinterpreting the indications. You are absolutely correct that the starter battery should be "spared". Really what "spared" means is that it should always and only be connected to the engine starter. The output of the alternator should be switched by an ACR or echo charge to charge the start battery only after the house batts have sufficient voltage.
In the link is a picture of a "better" way to wire a system like yours. If you wanted to install the system as depicted but split the bank of 2 house batteries, you could re-purpose your old/existing 1-all-2 switch such that it separates the 2 house batts shown as a single bank. https://drive.google.com/file/d/1bmc_PsjKHSQKYjy4Jnhl7ZV232MoiOJ2/view?usp=drivesdk Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Sat, Jan 4, 2020, 9:27 PM Peter Cowenhoven via CnC-List < cnc-list@cnc-list.com> wrote: > This may be obvious to most of you but came as a surprise to me. I've got > a 3 battery bank with 2 deep cycles and 1 starter battery. It's got a 1 > All 2 switch. I was testing load and was surprised to see that if you're > using 1 or 2 it's also drawing power off the starter battery too. > > Doesn't this defeat the point. Shouldn't the starter battery be completely > spared while not running the engine. > > Is there a better configuration? > > Thanks in advance! > > Peter > > 84 Landfall 35 > > > > Sent from Yahoo Mail on Android > <https://go.onelink.me/107872968?pid=InProduct&c=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal&af_sub2=Global_YGrowth&af_sub3=EmailSignature> > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
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