--- title: MS-7K-U Batteries Switched Off description: Steps and instructions to bring the MS-7K-U batteries online using the Black Start function / button --- [Skip to content](https://support.atmoce-au.com/knowledge-base/ms-7k-u-na#main-content) English - United Kingdom Show submenu for translations [![ATMOCE 2025 Black Logo](https://support.atmoce-au.com/hs-fs/hubfs/ATMOCE%202025%20Black%20Logo.png?width=200&height=200&name=ATMOCE%202025%20Black%20Logo.png)](https://www.atmoce.com/au) - [Home](https://support.atmoce-au.com/knowledge-base) - [Atmoce Website](https://www.atmoce.com/au) Open main navigation Close main navigation - [Home](https://support.atmoce-au.com/knowledge-base) - [Atmoce Website](https://www.atmoce.com/au) - English - United Kingdom Show submenu for translations - [Customer Portal](https://support.atmoce-au.com/tickets-view) [Customer Portal](https://support.atmoce-au.com/tickets-view?hsLang=en-gb) How can we help you? - There are no suggestions because the search field is empty. 1. [Atmoce Knowledge Base](https://support.atmoce-au.com/knowledge-base?hsLang=en-gb) 2. [Troubleshooting](https://support.atmoce-au.com/knowledge-base/troubleshooting?hsLang=en-gb) 3. [Battery](https://support.atmoce-au.com/knowledge-base/troubleshooting?hsLang=en-gb#battery) 23 September 2026 # MS-7K-U Batteries Switched Off ### Issue The batteries may switch off in situations where it cannot automatically recover (e.g. after an overload shutdown). This also typically occurs in off-grid or backup scenarios only. ### Solution The batteries can be switched back on manually via the Black Start function.  This solution requires the following prerequisites. 1. The system must have backup functionality (e.g. MC100PRO). 2. At least 1 battery has 5% SOC (or more). 3. High powered loads and non-esential backup loads are switched off before manually restarting. 1. Locate the Black Start button on the right side of the battery (2) . ![battery\_clearance](https://support.atmoce-au.com/hs-fs/hubfs/AU%20KB%20Database%20-%20Do%20not%20delete/battery_clearance.webp?width=670&height=574&name=battery_clearance.webp) 2. Press and hold the button for **30 seconds**. 3. Release the button and wait for the system to restart. For systems with multiple batteries, only 1 battery needs to be manually started. The remaining batteries will start automatically.   --- *Information in this article was current at the time of publication or last update. Product specifications, software, firmware and procedures may change. Please refer to the latest ATMOCE documentation before proceeding.* - [Installation](https://support.atmoce-au.com/knowledge-base/installation?hsLang=en-gb#main-content) - [Battery](https://support.atmoce-au.com/knowledge-base/installation?hsLang=en-gb#battery) - [Gateway](https://support.atmoce-au.com/knowledge-base/installation?hsLang=en-gb#gateway) - [Other devices](https://support.atmoce-au.com/knowledge-base/installation?hsLang=en-gb#other-devices) - [Combiner Box](https://support.atmoce-au.com/knowledge-base/installation?hsLang=en-gb#combiner-box) - [Commissioning](https://support.atmoce-au.com/knowledge-base/commissioning?hsLang=en-gb#main-content) - [Atmozen Commissioning](https://support.atmoce-au.com/knowledge-base/commissioning?hsLang=en-gb#atmozen-commissioning) - [Adding Smart Device](https://support.atmoce-au.com/knowledge-base/commissioning?hsLang=en-gb#adding-smart-device) - [Site Configuration](https://support.atmoce-au.com/knowledge-base/site-configuration?hsLang=en-gb) - [Troubleshooting](https://support.atmoce-au.com/knowledge-base/troubleshooting?hsLang=en-gb#main-content) - [Battery](https://support.atmoce-au.com/knowledge-base/troubleshooting?hsLang=en-gb#battery) - [Backup](https://support.atmoce-au.com/knowledge-base/troubleshooting?hsLang=en-gb#backup) - [Service & Warranty](https://support.atmoce-au.com/knowledge-base/service-warranty?hsLang=en-gb#main-content) - [Device Replacement](https://support.atmoce-au.com/knowledge-base/service-warranty?hsLang=en-gb#device-replacement) - [FAQs](https://support.atmoce-au.com/knowledge-base/faqs?hsLang=en-gb#main-content) - [Customer FAQs](https://support.atmoce-au.com/knowledge-base/faqs?hsLang=en-gb#customer-faqs) - [Installer FAQs](https://support.atmoce-au.com/knowledge-base/faqs?hsLang=en-gb#installer-faqs) [![ATMOCE 2025 Black Logo](https://support.atmoce-au.com/hs-fs/hubfs/ATMOCE%202025%20Black%20Logo.png?width=150&height=150&name=ATMOCE%202025%20Black%20Logo.png "ATMOCE 2025 Black Logo")](https://www.atmoce.com/au) [mailto:email@email.com](mailto:email@email.com) Copyright © 2026, ATMOCE Australia Pty Ltd