Wayne has been retired now, for at least a few years, and that number is now likely much larger. of Blue Sea Systems, a number of years ago, he suggested that over 500,000 ACR’s had been sold world wide. The Blue Sea Systems ACR’s (automatic charging relays) are one of the most common charge management devices in existence today. Unlike a diode type isolator, which causes an approximate 0.6V volt drop to the batteries being charged, the combiner/VSR’s were simple voltage triggered paralleling switches and both batteries could be charged without human intervention or the voltage drop associated with diode type isolators. Back in the early 90’s the first of the voltage sensing relays were hitting the market, thus no longer requiring the owner to do anything to the battery switch in order to charge both battery banks. Many a boater has succumbed to two dead banks due to what we refer to as HEF (Human Error Factor). However, when the owner stopped the boat the switch was often forgotten about and left in the PARALLEL position thus draining both batteries while on the hook. This was all well and good, charging in parallel, so long as the motor was running. The most ubiquitous of these methods was simply switching to the BOTH/ALL or 1+2 setting on a 1/BOTH/2 battery switch. In days of old a boat owner had to use the battery switch to route/direct charging to the bank or banks they desired to charge. It does this automatically with no human forgetfulness. You read that correctly, in its simplest form, all an ACR really does is parallel batteries when charging is present and un-parallel batteries when there is no charging present. MHT RECOMMENDED PRODUCTS: AFILLIATE DISCLAIMER Mastervolt Charge Mate Pro 40) is used to current-limit the alternator, but needs an intelligent additional control to terminate the charge of a lithium battery.WARNING: The ACR’s in this article are not for use with LiFePO4 Batteries!Īn ACR is nothing more than a fully automatic, voltage triggered, BOTH/PARALLEL switch that closes when charging voltage is present and opens when charge voltage is no longer present. In addition, the Lithionics Battery® 12V ACR provides solutions for less common use cases where 2 nd alternator is installed to charge the house battery, but its internal regulator is not designed for fine charge control of lithium batteries, as well as cases where a 3 rd party battery disconnect (ex. At the same time, a lithium battery requires charge termination when fully charged, so our 12V ACR keeps it disconnected after the charge cycle is completed. Lithium batteries have an advantage of absorbing as much charge current as possible during the bulk charge stage, which could overheat and potentially damage stock engine alternators, so our intelligent 12V ACR reduces the duty cycle and allows cooling periods. Our intelligent 12V ACR allows customers to take advantage of all situations to keep both batteries charged, while keeping them separate when charging is not available or not desirable. Normally, when the engine is running, the chassis battery is charging, but when the vehicle is stationary and connected to the power grid, the house battery is charging. In a typical vehicle the chassis battery is reserved for engine starting, while the house battery is used for “hotel” (or house loads) or work-related loads. to allow charging separate Chassis and House batteries from common charge sources such as an engine alternator, inverter/charger, solar. An Automatic Combiner Relay (ACR) is often used in vehicle applications such as RVs, Work Trucks, Marine vessels, etc.
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