# SmartShunt300A\_wrong connection\_history **URL:** \ **Category:** DIY\ **Tags:** smartshunt, diy\ **Created:** [1 May 2026 06:44 UTC](https://community.victronenergy.com/t/smartshunt300a-wrong-connection-history/57379 "2026-05-01T06:44:03Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![pwfarnell](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/pwfarnell/32/2341_2.png) [@pwfarnell](https://community.victronenergy.com/u/pwfarnell)\ **Post date:** [1 May 2026 08:27 UTC](https://community.victronenergy.com/t/smartshunt300a-wrong-connection-history/57379/2 "2026-05-01T08:27:15Z")
The only way to reliably get the SOC correct is to perform a full charge where the controller reaches float and the SmartShunt synchronises to 100% or you set it to 100% mamually. As you have made one of the two common mistakes, here is a link to the other, not setting the SmartShunt settings properly. Both ate covered in the manual. > [@Battery monitor jumping to 100% or reporting a high SOC with low Volts / the BMS shuts down](https://community.victronenergy.com/t/shunt-battery-monitor-jumping-to-100-or-reporting-a-high-soc-when-the-volts-are-low-and-or-the-bms-has-disconnected/88): > > This topic covers the reported SOC being out of sync with the actual battery voltage or state. It covers BMV battery monitors, SmartShunts, Lynx BMSs and Lynx Shunts and will just be called shunt below. It is also assumed that the shunt is monitoring the domestic / house / cabin battery bank and not engine start / bow thruster / winch / caravan mover battery banks. The problems may be one or more of the following and is often linked to mobile applications with small solar systems. The SOC jum… And for completeness > [@Shunt / battery monitor not reading the correct SOC/ Amps, missing solar, decreasing daily or other misreading problems](https://community.victronenergy.com/t/shunt-battery-monitor-not-reading-the-correct-soc-amps-missing-solar-decreasing-daily-or-other-misreading-problems/87): > > This topic covers the SOC / Amps reported by BMV battery monitors, SmartShunts, Lynx BMSs and Lynx Shunts and will just be called shunt below. It is also assumed that the shunt is monitoring the domestic / house / cabin battery bank and not engine start / bow thruster / winch / caravan mover battery banks. The problems may be one or more of the following The SOC decreases daily despite the solar charger or other charger(s) working. The SOC increasing when discharging and falling when charging… --- _[View the full topic](https://community.victronenergy.com/t/smartshunt300a-wrong-connection-history/57379)._