--- product_id: 31393521 title: "Blue Sea 7620 ML-Series Automatic Charging Relay (Magnetic Latch) 12VDC, default title" brand: "blue sea systems" price: "āļŋ23450" currency: THB in_stock: true reviews_count: 9 url: https://www.desertcart.co.th/products/31393521-blue-sea-7620-ml-series-automatic-charging-relay-magnetic-latch store_origin: TH region: Thailand --- # Automatic charging relay Emergency battery paralleling Dual battery bank management Blue Sea 7620 ML-Series Automatic Charging Relay (Magnetic Latch) 12VDC, default title **Brand:** blue sea systems **Price:** āļŋ23450 **Availability:** ✅ In Stock ## Summary > 🔋 Power up smartly — never miss a charge, never lose a start! ## Quick Answers - **What is this?** Blue Sea 7620 ML-Series Automatic Charging Relay (Magnetic Latch) 12VDC, default title by blue sea systems - **How much does it cost?** āļŋ23450 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/31393521-blue-sea-7620-ml-series-automatic-charging-relay-magnetic-latch) ## Best For - blue sea systems enthusiasts ## Why This Product - Trusted blue sea systems brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - â€Ē **Built for Reliability:** Robust magnetic latch design guarantees consistent performance in demanding marine and automotive environments. - â€Ē **Emergency Power Boost:** Parallels battery banks instantly for reliable emergency starting when you need it most. - â€Ē **Smart Automatic Relay:** Activates charging relay automatically, eliminating manual intervention and boosting efficiency. - â€Ē **Remote Control Convenience:** Includes ML-Series Remote Control Contura Switch PN 2146 for easy, on-demand operation from a distance. - â€Ē **Seamless Dual Battery Control:** Effortlessly manages charging for two large battery banks, ensuring optimal power distribution. ## Overview The Blue Sea 7620 ML-Series Automatic Charging Relay is a 12VDC magnetic latch relay designed to automatically manage charging between two large battery banks. It includes a remote control Contura switch for convenient operation and allows battery paralleling for emergency starting, making it an essential power management solution for marine and automotive applications. ## Description Includes ML-Series Remote Control Contura Switch PN 2146 Automatically manages the charging of two large battery banks. ## Features - Includes ML-Series Remote Control Contura Switch PN 2146 - Automatically manages the charging of two large battery banks - Allows paralleling of battery banks for emergency starting ## Product Details - **Connector Type:** Screw - **Contact Material:** Silver Alloy - **Contact Type:** Normally Open - **Current Rating:** 500 Amps - **Mounting Type:** Surface Mount ## Images ![Blue Sea 7620 ML-Series Automatic Charging Relay (Magnetic Latch) 12VDC, default title - Image 1](https://m.media-amazon.com/images/I/81sBGL6Ft+L.jpg) ## Available Options This product comes in different **Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Cool little battery charge/discharge relay, much better than the old diode isolators. *by R***S on Reviewed in the United States on April 13, 2016* Installed recently, so far so good, super-solid build quality. use to connect a house battery (with connected solar module) to engine battery so either can pass power back and forth. The unit is very simple with two main power lugs (one for each 12V battery) a spade lug for ground sensing (required) another lug for start bypass (optional) (disconnects the house battery during engine start) and a lugs for an optional remote 12V LED status indicator (unit has integrated LED indicator).Premise of operation: Unit connects battery sources together if one *or* the other have a higher voltage (its a relay so when connected both batteries are wired together) Example, I have the engine battery and alternator and a house battery with solar, I want the alternator to charge the starting and house battery but not allow house loads to pull from the starting battery when engine is off (typical configuration) however, I also have a solar PV module that produces surplus power so charging the starting battery with excess power is preferred. So the house battery connects to one terminal, the start battery to the other, if the engines running the start and house battery link, if the engine is off the start battery is disconnected from the house battery *unless* the solar output pushes the house battery voltage above 12.8v, then the relay will close and link both batteries. Once the sun goes down, the relay opens separating the batteries again. ### ⭐⭐⭐ Depends on your situation and battery type *by I***S on Reviewed in the United States on November 10, 2019* First, the build quality of this unit is excellent. No issues there. Unfortunately, the usability of the Si-ACR is very limited depending on your setup and battery type.If you are running only FLA, AGM or Gel batteries, and plan to have this relay as the only connection between the two, it works great. It is consistent and works as intended.My two major issues:1- These relays do not work as intended with LiFePo4/Lithium batteries. The relay reads the higher voltage of the Lithium battery as a "charge source" and always stays on. This defeats the purpose of having a relay. In order for this relay to be effective with modern Lithium batteries and charging systems, there needs to be a selectable voltage threshold for connect/disconnect.2- In my setup, I have a manual disconnect switch. This allows me to completely disconnect the charging source from the auxiliary battery. When the switch is "off", the Si-ACR continuously flashes the LED warning light, indicating that there is only one battery connected. This feature is a waste of battery charge, and the LED will burn out before too long. The unit needs a "test" button that will show this flashing light; having it run constantly is a nuisance.All in all, it's a decent relay, but lacks modern functionality for Lithium batteries, as well as the ability to adjust to different configurations. Three stars. ### ⭐ Received a used one (update: IT DID NOT WORK), WTF *by I***T on Reviewed in the United States on December 11, 2018* UPDATE: the ML-ACR and switch were not functional! I was first annoyed that they arrived in used condition then I was even MORE annoyed and angry when I was troubleshooting it because it was not functioning as it should have been. I have a meter and I was testing everything and all signed pointed back to the ML-ACR not functioning properly (the switch also would not even light up), so I had to return it. *The ML-ACR I purchased as a replacement from another vendor was installed and the switch was installed (with the SAME wiring that the used one i bought off here had) and it functioned FLAWLESSLY IMMEDIATELY!!!! You can gamble if you feel like your potentially wasted time is worth the minute cost savings but I will not be doing that again.This was more a waste of my money, it was a waste of my time which I cannot get back. I am very unhappy with this. It ruined a perfectly good afternoon, then I bought from another vendor anyway to avoid this issue again...........................................................................................................................................................................................................My ML-ACR arrived and when i took it out of the package i noticed it looked used, the wiring pigtails had solder already on them and some electrical tape residue. The back of the ML-ACR had tape residue on it as well as if someone used doublestick tape to mount it the first time.I am overall not happy that it seems i got a used product. I was in a hurry for my purposes and could not wait to get another one so I didnt mess with the return policy but I am still unhappy about it. 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