DELTA 3 Firmware: Off-Peak Scheduling and Energy Dashboard

EcoFlow released two firmware updates for the DELTA 3 over the first few months the unit was available in 2026. Most owners applied them automatically through the EcoFlow app and did not realise they unlocked meaningful new capabilities. A three-month hands-on test published by Portable Power Nerd documented the changes: “two firmware updates over a three-month test improved charging-curve accuracy, Wi-Fi remote monitoring with an energy dashboard (daily/weekly/monthly), and smart scheduling for off-peak charging.” If you have not configured these features since updating, they are sitting in your app unused.

This guide covers what changed in the firmware, where to find each new feature in the EcoFlow app, and how to configure them for a DELTA 3 used in common scenarios — daily backup, solar charging, and time-of-use grid charging. None of these require any hardware change; everything is a software setting on the unit you already own.

Check your current firmware version first

Before configuring the features below, confirm your DELTA 3 is running current firmware. Open the EcoFlow app, select your DELTA 3 device, and tap the settings icon in the top-right corner. Under “Device Info” or “About,” you will see the current firmware version number. If the app shows an update available — a badge or a notification in the firmware settings — apply it now. The DELTA 3 downloads firmware over Wi-Fi and applies it while the unit is on; you do not need to connect a cable or contact EcoFlow support. The update takes 5–10 minutes and the unit restarts automatically when complete.

After the update applies, the unit reboots and the EcoFlow app reconnects within 60 seconds if the DELTA 3 and your phone are on the same Wi-Fi network. Check the firmware version again after the reboot to confirm the update succeeded. If the update fails partway through (rare but possible during a Wi-Fi interruption), the DELTA 3 reverts to the previous firmware version safely — the update process is designed to be safe to interrupt. Simply retry the update when Wi-Fi is stable. For more detail on what else firmware updates reset and what to reconfigure after each one, the firmware update settings guide covers all the configuration options that return to defaults post-update.

The charging-curve accuracy fix: what changed and why it matters

The DELTA 3’s original firmware shipped with BMS calibration constants that caused the displayed battery percentage (SOC) to diverge from actual charge state in the 30–70% range. In practice this meant the app might show 65% while the unit actually held closer to 55%, leading to unexpected runtimes shorter than the SOC reading suggested. The firmware update corrected the voltage-to-SOC mapping curve, bringing the displayed percentage into closer alignment with measured capacity across the full charge range.

After applying the update, some owners report the displayed SOC dropping by a few percentage points immediately after reboot — this is expected. The unit recalculates its position on the corrected curve and displays the more accurate figure. If your DELTA 3 was previously showing, say, 70% and the display drops to 64% after the firmware update, the 64% is the accurate number. The old 70% was an overclaim from the miscalibrated curve. The practical effect is that runtime estimates in the app become more reliable — the “estimated time remaining” figure (which is based on current load and displayed SOC) is more accurate on current firmware than it was originally. This matters most for appliances you are running close to the battery floor, where accurate SOC is the difference between a planned shutdown and an unexpected cutoff.

Setting up off-peak charging in the EcoFlow app

Off-peak charging is in the EcoFlow app under your DELTA 3’s charging settings. The feature is called “Charging Schedule” or “Scheduled Charging” depending on app version. You define one or more time windows per day during which AC charging is permitted. Outside those windows, the unit accepts no grid power through the AC inlet. You can set different windows for weekdays and weekends, which matters if your utility’s TOU rate structure differs by day type.

A common configuration for owners on TOU tariffs: set AC charging to run from 11 PM to 7 AM (off-peak hours for most US utilities), with charge limit set to 80% to preserve battery longevity. The DELTA 3 charges from the wall when cheap power is available, stops at 80% to protect the cells from sitting at 100%, and holds ready for discharge during peak hours. If the battery depletes during the day before the next off-peak window, solar input covers the gap — solar is never restricted by the AC schedule. The charge limit setting (separate from the schedule) is in the same charging settings menu: set it to 80% for long-term storage or to 100% before an anticipated outage. For a full breakdown of all the charging settings in the EcoFlow app across charge limit, TOU scheduling, and port cutoffs, the app settings guide covers each option in detail.

The energy dashboard: daily, weekly, and monthly tracking

The energy dashboard appeared in a post-launch firmware update and is accessible from the DELTA 3’s main device screen in the app — look for an “Energy” tab or icon depending on app version. The daily view shows a bar chart of hourly input (solar and AC charging) and output (discharge to loads). This is useful for identifying when your loads are drawing the most power — if you see a large discharge bar at 6 PM every day, that is your evening consumption peak, and it tells you how much solar or scheduled grid charging you need to cover it.

The weekly view aggregates daily totals into a seven-day bar chart. After a week of use, you will see which days had the most solar harvest (look for high input bars on sunny days) and which had the highest consumption. The monthly view gives a calendar month at a glance. All of this data is stored in the EcoFlow cloud, so it persists if you reinstall the app or change phones. The cumulative statistics — total kWh in and total kWh out since the unit was set up — are also visible and are useful for calculating long-term efficiency: dividing total kWh out by total kWh in gives you the system’s round-trip efficiency over real-world use. For the DELTA 3, this should be in the 85–90% range under typical conditions.

Smart scheduling for solar + grid combined charging

The scheduling feature works best when combined with the DELTA 3’s solar input. The practical setup: configure the AC charging schedule for off-peak grid hours only (overnight), connect solar panels to the DELTA 3’s solar input for daytime charging, and set a charge limit of 80–90% to protect the battery. The result is a charging strategy where solar covers most of the daily top-up for free, the overnight grid schedule covers whatever solar did not fill, and the DELTA 3 is always charged and ready for evening demand without paying peak electricity rates.

This combined strategy requires that the DELTA 3’s solar input is actually being used — the unit accepts up to 220W of solar input (for DELTA 3 base model) or up to 800W (DELTA 3 Max). If you are connecting EcoFlow’s 160W or 220W folding panels, a single panel on the DELTA 3 base model hits the input ceiling. For the DELTA 3 Max’s 800W ceiling, two 400W rigid panels in parallel (staying within the 60V input limit) are a practical pairing. The MPPT controller adjusts for shading and partial cloud cover automatically — you do not need to adjust the schedule when weather changes. The DELTA 3 Plus solar and shade configuration guide covers panel wiring strategies for maximising MPPT efficiency under mixed light conditions; the same principles apply to the base DELTA 3.

Other settings to review after a firmware update

EcoFlow firmware updates on the DELTA 3 reset several settings to factory defaults. After each update, check: your AC charge rate setting (may have reverted to maximum from a lower rate you set for quiet charging), your charge limit (may have reverted to 100% from your preferred 80% or 90%), your DC output port settings (USB-C and USB-A cutoff thresholds sometimes reset), and your Wi-Fi network credentials if the unit had trouble reconnecting post-update. The AC charge rate is particularly important for overnight charging near bedrooms — the DELTA 3 at full 1,200W AC charge rate produces audible fan noise; many owners set it to 600W or 800W for quieter overnight operation, and this setting reverts after each update.

The scheduling settings (off-peak windows) and the energy dashboard data are stored in the EcoFlow cloud and survive firmware updates — these do not reset. Only local device settings (charge rate, charge limit, port cutoffs) revert. Building a habit of checking these five settings after each firmware update takes two minutes and prevents the frustration of running an overnight charge at full fan speed after forgetting the reset happened.