Depending on the ACR design and how it is setup it may sense either battery OR both batteries. If sensing both, then any time either battery voltage is greater than ~13.3ish the ACR connects the two. This is the simplest and most straightforward design but you'd have to read the owners manual. This design allows a charge voltage to be applied to either battery (or both) and eliminates charging system design questions.
Josh On Mon, Nov 23, 2020, 22:35 Joel Aronson <joel.aron...@gmail.com> wrote: > My understanding is that the ACR is usually connected to the start battery > and when it’s charged the relay switches to house. The controller should be > connected to the start so the relay can function > > On Mon, Nov 23, 2020 at 10:32 PM Josh Muckley <muckl...@gmail.com> wrote: > >> The battery monitor is probably not setup for a charger voltage to be >> entering from the cigarette lighter. To better establish the actual >> conditions of your setup you need to provide the terminal voltage of each >> of the batteries. You also need to provide the chemistry of each of the >> batteries. >> >> A flooded lead acid battery that is drained ~90% will read ~12.65v with >> no load after 24 hours of being disconnected from the circuit (physically >> remove the ground connection from the battery terminal). Anything more >> than 12.65v after 24hours of being disconnected tells me the monitor is >> wrong. This is what I would look for to confirm that the battery >> monitor is indicating true state of charger. >> >> Josh Muckley >> S/V Sea Hawk >> 1989 C&C 37+ >> Solomons, MD >> >> >> >> >> On Mon, Nov 23, 2020, 21:50 Charlie Nelson via CnC-List < >> cnc-list@cnc-list.com> wrote: >> >>> My boat has a house bank and a starting battery with an ACR controller >>> so that the ‘banks’ are ‘equalized’ when a charging source is >>> available—shore power or engine alternator. >>> >>> I added a solar panel to maintain the batteries without the hazards of >>> leaving the boat on shore power charging when I am not on board. >>> >>> Per local advice, I ran the solar power output controller (MPPT) current >>> thru my cigarette lighter(with the appropriate circuit breaker in the ‘on’ >>> position) and it appears to be working since my house bank (which powers >>> the cigarette lighter) looks like it is 100% charged per my Victron battery >>> monitor after 9 days without a battery charger or running the engine. >>> >>> OTOH, my starting battery voltage sagged over these 9 days of this test >>> to about 90% of maximum per the Victron battery monitor. >>> >>> My understanding of the ACR is that it should distribute charging >>> current to keep both battery banks ‘equalized’ so the lower charge state on >>> the starting battery doesn’t make sense to me. >>> >>> My questions to the list are: >>> >>> 1. Should the ACR be equalizing the charging source current as I discuss >>> above, even when this current might be significantly less than my shore >>> power Xantex 40? >>> >>> 2. If so, why is my starting battery ‘down’? >>> >>> 3. If not, what am I doing wrong? I could hook up the solar directly to >>> the starting battery but with the ACR, this seemed unnecessary (if I >>> understand how an ACR works.) >>> >>> Charlie Nelson >>> 1985 C&C 36XL/kcb >>> Water Phantom >>> Sent from AOL Mobile Mail >>> Get the new AOL app: mail.mobile.aol.com >>> October is the time to show your appreciation with a small contribution >>> to this list to help offset the costs. If you want to support the list - >>> use PayPal to send contribution -- https://www.paypal.me/stumurray >>> Thanks - Stu >> >> October is the time to show your appreciation with a small contribution >> to this list to help offset the costs. If you want to support the list - >> use PayPal to send contribution -- https://www.paypal.me/stumurray >> Thanks - Stu > > -- > Joel > > October is the time to show your appreciation with a small contribution to > this list to help offset the costs. If you want to support the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray Thanks > - Stu
October is the time to show your appreciation with a small contribution to this list to help offset the costs. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu
