Each engine's stator puts out about 15a so with both engines running there is about 30a worth of charging current which is more than most plug-in chargers. This is enough to trigger the ACR into combine mode. This is useful on long holiday weekends at a distant destination where AC power may not be available overnight.Ĭlick to expand.The stators put out over 13v when then engine is running. You can also influence the ACR's behavior by turning off the stereo for a period long enough while the ACR has a chance to latch closed and start recharging the house battery. Fortunately the exact cause can be confirmed with a basic multimeter.
#Blue sea marine battery isolator full#
Possible reasons for not working as you wish is inadequate battery capacity, degraded battery condition, inadequate shore charger capacity, starting off the day with less than a full charge, killing the deep cycle battery(s) by discharges below 11.8 to 12.0 volts (50% capacity). While an ACR is a fixed function its behaviors will definitely change in response to different systems and different conditions. In contrast, if the ACR was governed by the ignition rather than a sensed voltage threshold you could damage the boat's charging system and deplete the starting battery even while you are running underway. This certainly increases your dependency on AC shore charging.
#Blue sea marine battery isolator trial#
As it continues this trial over intervals it may remain 'open' for the remainder of the day. And, the ACR will open again immediately for a prescribed length of time. Once the house battery is depleted beyond a certain point and the ACR attempts to 'combine' as the engine is running and elevates the voltage on the charging side, a deeply discharged house battery suddenly in parallel will then cause the charging side voltage to instantly sag. The ACR 'combines' once the voltage reaches a predetermined voltage on the charging side of the ACR. The ACR 'separates' once the house bank side voltage drops below a predetermined voltage threshold in order to preserve the charging side voltage. However, I can tell you that from your description of conditions and per ACR behaviors that which you described would be normal.Īn ACR does NOT automatically combine and therefore charge the house bank once the engine is running. It can be surface or rear mounted for a cleaner look.Without inspecting your system, I cannot say that everything is right. This switch is ignition protected and compatible with installations in engine compartments of gasoline powered boats. However, if there is a time that extra power is needed from the battery with a charge, the combine features allows you to draw power to start the engine or make an emergency radio call. This eliminates the risk of draining the start battery by leaving the stereo on too long or running the trolling motor too much. While in the “on” position, both house and start batteries provide power, but are separated giving power to only the circuits dedicated to each battery. The included battery switch, a Blue Sea System m-Series Dual Circuit Plus™ switch, is packed with features. Because the ACR is ignition protected, it can be installed within the engine room. The ACR will share the charging source more efficiently than a battery isolator-without creating a voltage drop-and will not require additional wiring or an external regulator installation is straightforward. It combines the two batteries while charging, and isolates the house battery to protect sensitive electronics while starting the engine. The automatic charging relay, a Blue Sea Systems 7601, performs several tasks. The included battery switch provides an emergency combine feature that can get you out of a jam. That is until one battery can no longer supply power. It also helps to keep the two power sources separate so that you are only drawing power from the battery you want to. The kit allows you to charge your new and existing battery from a single charging source often your engine. Both components are designed for the marine environment. The Blue Sea System “Mini” Add-A-Battery™ kit packages a switch and an automatic charging relay (ACR) to help protect and maintain the additions to your boat. If you are adding a second battery to support a larger stereo, a trolling motor or a new fishfinder, this is an essential part of the installation. Adding a second battery to support your new electronics or trolling motor? Charge it and use it as an emergency backup with a Mini Add-A-Battery system.
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