How to Read the Lights on Your GoodWe ESA Inverter and Battery

GoodWe ESA systems combine an inverter and stackable battery modules into a single, pre-wired, modular unit, but the exact variant installed in your home can differ by power rating and platform. Because indicator lights and fault behaviour can vary by version and configuration, this guide keeps you at a safe, high level: your job is to observe what you can see on the outside of the unit, record the exact light state or flash pattern, and pass that evidence to your installer or GoodWe support channel.

Stay within an “observe only” boundary. Do not remove covers, do not access connectors or switches, and do not attempt any shutdown/restart sequence, settings changes, or battery “start” actions based on internet advice. The goal is simply to interpret what the lights suggest at a broad level (normal / waiting / fault) and to gather enough detail for a qualified person to act.

1) Confirm what you are looking at (inverter vs battery module)

The ESA Series is described by GoodWe as an all-in-one solar and storage solution with a modular design that combines inverter and battery in a pre-wired unit. In many homes it appears as a stacked system, and what you can see externally may include both the inverter section and one or more battery modules.

If you are not sure which part’s light you are seeing, do not guess. You can still collect useful evidence by photographing the full front of the unit from a safe distance and noting whether the light is on the inverter section, on a battery module, or near a button/indicator area.

• Take one clear photo of the whole system (showing the full stack).
• Take a closer photo of the indicator area (without touching the unit).
• Write down any visible product label information (model name, power rating, serial number) if it is readable without moving panels or covers.

2) What the battery indicator light and multi-function button mean (high level)

The ESA user manual describes a “Multi-function button indicator light” on the battery, used to indicate battery operating status. This is the most concrete, user-facing light reference available in the approved sources, but the manual excerpt does not provide a full colour/flashing legend in the text we have. That means you should not rely on generic “green = good, red = fault” assumptions unless your installer confirms the legend for your exact model.

Even without a legend, you can still treat the indicator as a signpost: a steady state suggests the battery is in some stable operating mode, while repeating flashes often provide a pattern that support teams can match to logs or known behaviours. Your best contribution is to capture the pattern accurately and consistently.

• Note whether the indicator is off, steady on, or flashing.
• If flashing, count the rhythm: for example, “two quick flashes, pause, repeat”.
• Time the cycle length (roughly): e.g., “repeats every ~5 seconds”.
• Record what was happening in the home at the time (normal day, storm, grid outage, etc.).

3) If you suspect a fault: capture evidence, do not intervene

If the system is not behaving as expected, your indicator light observations become especially valuable. The ESA manual includes fault codes and handling recommendations that repeatedly direct the user to contact the dealer/distributor/after-sales service centre when internal battery functions do not operate normally. That is an intentional boundary: homeowners can observe symptoms, but diagnosis and corrective action belong with qualified support.

Some fault recommendations in the manual involve checks or comparisons that are not appropriate for an untrained homeowner (for example, verifying voltage consistency). Do not attempt those checks yourself. Instead, use the manual as justification to escalate promptly with the best evidence you can provide.

• Write down any fault code shown in the app or interface (for example, the ESA manual lists fault codes such as F101 and F102).
• Photograph the screen/app page if a code is visible.
• Record whether the issue appeared after a power cut, after an outage restoration, or during normal operation.
• Contact your installer or after-sales service with your photos, code, and the time it occurred.

4) Outages and fast switchover: what you may notice at home

Many ESA installations are configured for backup. Solarboss describes the ESA switching so fast during grid loss that most homes will not notice the change, with UPS-level switchover under 4 ms, subject to how backup circuits and loads are set up. This can help you interpret what you are seeing: if the street is dark but your essential circuits are still running, your system may be operating in backup mode rather than “off”.

However, backup behaviour depends on how your home was designed and commissioned. If you are unsure whether your home has whole-home backup or selected backup circuits, do not make assumptions based on a light alone—report the symptom (what stayed on, what turned off) alongside the light pattern.

• During a suspected grid outage, note which loads stayed on (e.g., broadband, lights, fridge) and which turned off.
• Note whether anything reset (e.g., router reboot) even if power largely stayed on.
• Share these observations with your installer when reporting the indicator pattern.

5) Generator connection and special configurations: why lights can be misleading

Some ESA systems can be configured to work with a generator, and the ESA manual also describes conditions for using a Manual Transfer Switch or STS (not both), and requirements around parallel networking and metering. These configurations can affect operating states and what “normal” looks like in a given home.

Because of this, if your home has a generator connection, parallel inverters, or any unusual site design, it is even more important to focus on recording the light behaviour rather than trying to interpret it from a generic chart. Your installer can correlate the light pattern with the commissioned configuration and any monitoring data.

• If you have a generator, note whether it was running or recently used.
• If you know you have more than one inverter, mention that when requesting support.
• Do not attempt any switching between sources yourself—report and escalate.

6) What to send to support (a simple script)

Support teams move fastest when you provide structured, repeatable observations. Since the approved sources do not provide a full public light-meaning legend in the excerpts, the most useful thing you can do is provide a clear description of what you saw and when, alongside any fault code shown in the app.

Keep it factual and avoid assumptions like “the battery is dead” or “the inverter failed”. Instead, share the evidence: photos, flash counts, and the home’s symptoms. This matches the manual’s approach of directing users to after-sales support for fault conditions.

• System: “GoodWe ESA (power rating if known), number of battery modules in the stack.”
• When: “Date/time issue started; was there a grid outage or storm?”
• Lights: “Battery indicator: off/steady/flashing; exact pattern and cycle time.”
• Symptoms: “What in the home worked/didn’t; any resets noticed.”
• Codes: “Any fault code visible (e.g., F101/F102) and a photo.”

7) When to stop and call a qualified installer/electrician immediately

Stop at observation and escalation if anything looks abnormal or unsafe. The ESA system is a high-voltage solar and storage product, and the manual includes tasks (installation steps, electrical connection, and internal checks) that are not suitable for homeowners. If you cannot confirm the exact hardware variant or you do not have a verified light legend for your model, do not experiment or attempt “fixes” based on guesswork.

If your household power is unstable, if you smell burning, hear unusual noises, or see any physical damage, treat it as urgent: step away and contact your installer or a qualified electrician. If you only have an unexpected light pattern and the home otherwise seems normal, still report it—just do so with clear evidence.

• Do not remove any protective covers or access connectors.
• Do not press and hold battery buttons to force behaviour changes.
• Do not change any generator/transfer switching arrangements.
• Contact your installer or after-sales support with your recorded pattern and photos.

Official references and your system details

For official product documentation, use the GoodWe ESA user manual and share relevant pages with your installer if needed: GoodWe ESA 3–10 kW User Manual (EN PDF). For an example of a current Irish installed-system offering and typical backup expectations, see Solarboss’s ESA system page: Solarboss GoodWe ESA 5 kW system with 8 kWh battery.

If you want to sanity-check whether your unit is part of the ESA Series platform described by the manufacturer (integrated, modular, scalable), you can compare your model naming and appearance to the official ESA Series overview: GoodWe ESA Series product page. If anything does not match, stop and ask your installer to confirm the exact inverter and battery variant before anyone interprets indicator lights.