ESS #5 is slowly draining the battery instead of charging

Q&A and troubleshooting
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1

In pass-through mode, the ESS system (with batterylife enabled) is very slowly draining the battery at about -0.5Ah (for 820Ah LFP battery bank) even though:

  • It is already 5% below minimum 80% SOC
  • Inverter is in pass-through mode since the grid is available - no power failures in past few days
  • ESS is in #5 mode, and claims to be slowly charging the battery

It is a Quattro inverter set up with Cerbo GX and SmartShunt battery monitor. The system is grid-tie, and is in pass-through mode. Screenshot attached.

Will appreciate help with resolving it. I looked in ESS manual but found nothing about this condition.

ESS_Screenshot
ESS_Screenshot1606Ă—1350 153 KB

2

Turns out this was due to “Grid Metering” in ESS being set to “External Meter” (when none is installed) instead of “Inverter/Charger”. Setting it to “Inverter/Charger” fixed the issue. Now, it is indeed charging, and the layout also changes since Inverter is now measuring the energy flow through it.

vrm_screenshot
vrm_screenshot1614Ă—1092 61.1 KB

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