Configuration guide · Sunsynk hybrid inverter

Sunsynk Hybrid Inverter Setup — LCD Settings, Battery, System Mode & Grid

Complete walkthrough of the Sunsynk hybrid inverter LCD interface. Every setting explained in plain English — battery type, charge and discharge schedules, system mode, export limits, and UK grid compliance. Covers the Ecco and standard Sunsynk single-phase hybrids (3.6kW–8kW).

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All Sunsynk single-phase hybrids
LCD touchscreen walkthrough
UK grid and tariff settings

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We configure Sunsynk systems remotely via SolarMan — battery schedules, export limits, Octopus tariff windows, and grid compliance settings. Most systems done in one session.

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This guide covers LCD interface settings only — not physical installation or wiring.

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13 Trustpilot reviews

Trustpilot Google

I have a GivEnergy system consisting of two batteries, two inverters and a controlling EMS (Energy Management System) which has not worked since Nov 2025. After six months I discovered Solar Tech Support, reached out to them and Ron phoned me back – how often do you get that service? Could not be more helpful – worked directly with me over the phone, outside what I would call normal working hours. Lucid explanations and we were able to discuss the issues and history using camera and email history. As this was a very rare setup, Ron was able to access an EMS expert in the field to confirm the solution. One sunny day in, I am now only paying for standing charge and a few pence for spikes in grid consumption while battery catches up with house demand.

Ian · May 2026 Trustpilot

When my GivEnergy system had an issue, I was completely left without support and had honestly lost all hope. Thankfully, I searched online and found Ron, which completely turned things around. After sending him a message, he responded incredibly fast and called me to assure me that he would get the problem fixed. I really admire his dedicated, supportive nature and his determination to find a solution. With this kind of outstanding attitude and customer service, he has absolutely secured a future customer in me.

Sree · May 2026 Trustpilot

Ron want out of is way to help, nothing was to much. He was very thorough in what he did Very knowledgeable I would highly recommend Ron and his company He did a fantastic job for me. if you have any problems, he'll do his best to help you out and resolve your problem. I wouldn't hesitate to recommend them

Dennis Brown · May 2026 Trustpilot

Ron took me through a diagnostic to confirm my GivEnergy Inverter had a fault. A common one as it turns out with the AC Inverter. As GivEnergy is defunct there is no immediate fix, aside from sourcing 2nd hand replacement. It may be that a fix becomes available over the summer which would make a lot of GivEnergy customers happy (Again)

Tony Deacon · May 2026 Trustpilot

Contacted Ron with a problem and he sorted it out quickly with no problems at all. Very knowledgeable on anything solar/ batteries. I would recommend him to anyone

Phill · May 2026 Trustpilot

I've spoken to Ron a couple of times with issues with my Givenergy installation. Such a friendly knowledge guy very highly recommended. Thank you very much for resolving my issues

michael fairhurst · May 2026 Trustpilot

Contacted Solar Tech Support in desperation. After explaining the issues I had with my system a diagnosis was made and a solution proposed. Fantastic service, even contacted a manufacturer to arrange replacement parts for me. Great communications, explained all they were doing and what I had to do, clearly and precisly. Followed up to confirm all was ok. Excellent service.

Mr Machin · May 2026 Trustpilot

After GivEnergy went into liquidation, just my luck, my battery started playing up (internal board crashed). Contacted my installer - not interested! Found Solar tech support on a Google search. Sooo glad I found this company! Ron is extremely helpful and has plenty of experience. He soon confirmed what the fault was, and helped me to get my system up and running again. Now moved my GivEnergy account to Solar tech support, and will definitely use again if I have more issues. Unusual to find such a helpful company in these times, no morons reading scripts, just direct contact with the engineer.

Keith Ballard · Apr 2026 Trustpilot

Contacted Solar Tech Support when trying to understand what my Givenergy inverter problem might be and what might be my options. Received good/honest advise which backed up my thoughts.

Hugh Speirs · Apr 2026 Trustpilot

Ron is a super star. Two months ago my GivEnergy battery failed a firmware upgrade leaving it a brick. My installer couldn't/wouldn't fix it. GivEnergy couldn't/wouldn't fix it. Then they went into administration and all hope was lost. A flurry of emails later and Ron had diagnosed the fault (failed USB flash drive, something I'd suspected) and talked me through resolving it. Two months of nothing resolved in about 3 hours. It's great to work with someone who pays attention to the details, knows that they're doing (not just following a script) and gets stuff sorted without a fuss or up-charging.

Christopher · Apr 2026 Trustpilot

I can add to the list of customers who had already 'given up' on GivEnergy due to their appalling customer service, and that was before they went into administration (their Trustpilot reviews don't lie!). So you can imagine my desperation when, having changed my ISP and my Inverter, predictably, proving to be the only device that didn't connect automatically to my new network, I found zero prospect of any customer support with GivEnergy having called in the administrators just five days earlier! The salvation came from Solar Tech Support. My IT advisor stumbled across their web site and some very helpful tips for beleaguered GivEnergy customers, as well as an offer to provide direct assistance. Nothing ventured, I decided to drop them an E-Mail, with very low expectations based on my experience of GivEnergy customer support. Within an hour Ron had responded with some pin point advice, and after a few exchanges of E-Mails he had nailed the problem, enabling the combined efforts of my IT advisor and solar installer to resolve it and reconnect my Inverter. Thank you Solar Tech Support, and Ron in particular, for coming to the aid of a deserted and despondent GivEnergy customer. Expert, razor sharp advice and first class customer service, even though I wasn't officially a customer.

customer · Apr 2026 Trustpilot

This company are a rare gem, I had a very unusual problem following a failed firmware upgrade on my GivEnergy kit. I then found out GivEnergy were in administration and had dismissed all their support staff! None of the usual fixes to try and restore my inverter comms would work, and I looked everywhere, forums, GivEnergy youtube support videos - even AI couldn't figure it out. My installer was talking about huge sums for system replacements, and being vague / evasive about if they'd even install replacement GivEnergy inverter. Enter Solar Tech Support, reassuring and knowledgeable from the very start, I've learnt loads about my solar system though the friendly chat while my engineer worked as he diagnosed the problem and figured out a fix procedure that I've not found anywhere else - amazing . If you need solar system repairs - especially if you like me have been left high and dry by GivEnergy, I cannot recommend this company enough. Give them a call.

Andy Thomas · Apr 2026 Trustpilot

I sent a message on their website regarding a problem I have on my Givenergy system. Although not supplied by Ronald, I thought it was worth an email. Within the hour on a Saturday, he phoned and we discussed the problem. He logged in remotely and gave excellent advice. I'm too far away for his on-site help but he did diagnose the problem and was happy also to chat through my thoughts about an upcoming solar/battery install I'm planning. Great bloke.... if only he was nearer!

Philip · Apr 2026 Trustpilot

Ian · May 2026 Trustpilot

Sree · May 2026 Trustpilot

Dennis Brown · May 2026 Trustpilot

Tony Deacon · May 2026 Trustpilot

Contacted Ron with a problem and he sorted it out quickly with no problems at all. Very knowledgeable on anything solar/ batteries. I would recommend him to anyone

Phill · May 2026 Trustpilot

I've spoken to Ron a couple of times with issues with my Givenergy installation. Such a friendly knowledge guy very highly recommended. Thank you very much for resolving my issues

michael fairhurst · May 2026 Trustpilot

Mr Machin · May 2026 Trustpilot

Keith Ballard · Apr 2026 Trustpilot

Contacted Solar Tech Support when trying to understand what my Givenergy inverter problem might be and what might be my options. Received good/honest advise which backed up my thoughts.

Hugh Speirs · Apr 2026 Trustpilot

Christopher · Apr 2026 Trustpilot

customer · Apr 2026 Trustpilot

Andy Thomas · Apr 2026 Trustpilot

Philip · Apr 2026 Trustpilot

Getting started

Accessing the Settings menu

From the Home Page, tap the gear icon in the top-right corner of the LCD screen. This opens the System Setup screen with eight icons: Basic, Battery, Grid, System Mode, Advance, Aux Load, Fault Codes, and Li BMS. Each section is covered below in the order you'll typically configure them.

LCD navigation basics

Physical buttons

The LCD has four physical buttons below the screen: Esc (go back), Up (increase value), Down (decrease value), and Enter (confirm). You must press Enter after changing any setting — if you don't, the change won't be saved. On touchscreen models, you can tap directly on settings to change them.

LED indicators

Four LEDs sit above the screen: DC (green = PV connected), AC (green = grid connected), Normal (green = running normally), and Alarm (red = fault active). If Alarm is red, check Fault Codes before changing any settings.

Important: These settings can also be changed remotely via the SolarMan app or web portal if your datalogger is connected to WiFi. The LCD interface and SolarMan show the same settings — changes made on one appear on the other.

Step 1

Basic Setup — time, display, and reset

Tap the Basic icon on the Settings screen. This section has four tabs: Time, Display, Reset, and Remote.

Time

Set the correct date, time, and AM/PM. This is critical for charge and discharge schedules — if the clock is wrong by even an hour, your cheap-rate charging window won't fire when expected. During BST (late March–late October), make sure the clock reflects the +1 hour offset.

UK tip: The Sunsynk clock does not auto-adjust for BST/GMT. You need to change it manually twice a year (or let SolarMan sync it if your datalogger is online). A 1-hour clock error is the most common cause of missed charge windows.

Display

Set your system name (appears on the Home Page), toggle the beeper on or off, and configure Auto Dim (how many seconds before the LCD backlight dims). The beeper sounds for low battery warnings and fault alerts — most homeowners prefer it on.

Reset and Lock

Factory Reset restores all settings to defaults (password: 9999). Lock Out All Changes prevents any setting changes until unlocked (password: 7777). System Selfcheck runs an internal diagnostic (password: 1234). Locked Inverter fully locks the unit — only Sunsynk technical support can unlock it.

Warning: Do not use Factory Reset unless instructed by a qualified engineer. It clears all configuration including battery settings, charge schedules, and grid compliance — everything will need reconfiguring from scratch.

Remote

Tick "Allow remote control" to enable settings changes via SolarMan. This should be enabled for remote diagnostic and configuration support. If disabled, only LCD changes are possible.

Step 2

Battery settings — type, capacity, and charging

Tap the Battery icon on the Settings screen. Three tabs: Batt Type, Batt Charge, and Shut Down.

Battery Type (Batt Type tab)

Select your battery chemistry. Most UK installations use lithium-ion batteries.

LithiumFor lithium-ion batteries with BMS (most common — Pylon, Dyness, Sunsynk own-brand, etc.)

AGM VLead-acid using voltage-based settings

AGM %Lead-acid using SOC percentage settings

No battNo battery connected — inverter operates as grid-tied only

After selecting battery type, configure:

Batt capacityTotal capacity in Ah. For lithium, the BMS usually overrides this. For lead-acid, range is 0–2000Ah.

Charge AmpsMax charge current. Single 5kW battery: ~50A. Two batteries: ~80A. Check your battery spec sheet.

Discharge AmpsMax discharge current. Same guidance as Charge Amps. Lithium: Ah × 0.5. Lead-acid: Ah × 0.25.

ActivateMust be ticked. Recovers a deeply discharged battery by slowly charging from solar. Always leave on.

Battery Charging (Batt Charge tab)

This tab controls how and when the battery charges from the grid or generator.

Grid ChargeEnable this to allow the battery to charge from the grid. Essential for cheap-rate tariffs. Must be Yes.

Grid SignalWorks with Grid Charge. Tells the inverter when to stop grid charging based on the SOC target. Must be Yes.

AmpsGrid charging current in amps. Set based on battery spec — don't exceed the battery's rated charge current.

Gen ChargeFor generator-connected systems. Leave unticked unless you have a generator wired to the Gen input.

Gen SignalGenerator signal relay control. Leave unticked for standard UK installations.

For lithium batteries, voltage settings (Float V, Absorption V, Equalization V) are managed automatically by the BMS. For lead-acid batteries, use the manufacturer's recommended values — typical AGM: Float 55.2V, Absorption 57.6V, Equalization 58.8V for a 48V bank.

Shutdown and Low Battery (Shut Down tab)

These settings control how deeply the battery discharges before the inverter takes action. Getting these right protects battery health and prevents nuisance shutdowns.

Shutdown Reserve SOC %. When the battery drops to this level, the inverter enters standby mode (not a full power-off — total shutdown only occurs below 19V). This is your battery floor. Default: 20%.

Low Batt Warning SOC %. The inverter beeps when the battery reaches this level. Set 5% above Shutdown. Default: 20%, recommended: 25%.

Restart The SOC level the battery must reach (from solar or grid charging) before the inverter resumes normal AC output after a shutdown. Set at least 10% above Low Batt to prevent on/off cycling. Default: 40%.

Recommended UK settings: Shutdown 20%, Low Batt 25%, Restart 35%. This gives the battery a 20% reserve (protecting cell health), a 5% warning buffer, and ensures the system won't restart until the battery has meaningful charge.

Step 3

System Mode — export, load priority, and schedules

Tap the System Mode icon. This is the most important settings page — it controls how your system behaves day to day. Two tabs: System 1 (mode selection) and System 2 (charge/discharge scheduling).

System 1 — operating mode

Six settings control the core behaviour of your system:

1. Zero Export

When ticked, the CT coil monitors grid export and the inverter reduces output to prevent any power flowing back to the grid. Use this if you do not have an export tariff. The system will power your home load and charge the battery, but never export.

2. Solar Export

When ticked, the inverter operates in eco mode: solar covers your home load first, then charges the battery, then exports any surplus to the grid. This is the correct setting for SEG, Octopus Flux, or Octopus Agile export tariffs. When unticked, the inverter covers load, charges the battery, and then throttles PV production at 100% SOC — no export happens.

3. Limit to Load Only

When ticked, the inverter only powers the backup (essential) load connected to the inverter's load port. The home load on the grid side receives no inverter power. Rarely used in standard UK setups — mainly for off-grid or specific backup configurations.

4. Grid Trickle Feed

The amount of power (in watts) the inverter always draws from the grid. Set to 0W for standard UK credit meters. Only increase this (20–100W) for prepayment meters where Reverse Power Detection can cause the meter to trip. Almost never needed in the UK.

5. Inverter Power Limiter

Caps the maximum combined output to both Load and Grid ports. This is not your export limit (that's Max Sell Power). The default matches your inverter rating (e.g., 5000W for a 5kW model). Only reduce this if instructed by an engineer — it gets set to Low automatically if an over-current fault occurs.

6. Priority Load

When ticked, solar generation is directed to your home load first, then to the battery. This is the standard UK setting — you want to self-consume as much solar as possible. When unticked, solar charges the battery first, which is rarely what you want unless running a specific arbitrage strategy.

Common UK configurations

No export tariff (self-consume only)

Zero Export: ticked

Solar Export: unticked

Priority Load: ticked

Grid Trickle Feed: 0W

SEG or Octopus Flux (export tariff)

Zero Export: unticked

Solar Export: ticked

Priority Load: ticked

Grid Trickle Feed: 0W

System 2 — charge and discharge time windows

This is where you program when the battery charges from the grid and when it discharges. Tap the System 2 tab to see the scheduling grid.

User TimerMust be ticked to activate any schedules. Without this, the system ignores all time slots and batteries only charge from the grid when there's no other power source.

Time StartWhen this time slot begins (24-hour format).

Time EndWhen this time slot ends. Cannot cross midnight — split overnight windows into two slots.

PowerMax charge/discharge power for this slot in watts. Set to your inverter maximum (e.g., 5000 for 5kW).

SOC/VTarget SOC %. When Grid is ticked: charges to this %. When Grid is unticked: discharges down to this %.

GridTick = charge from grid during this window. Untick = discharge battery during this window.

GenTick = charge from generator. Leave unticked unless you have a generator.

Key rule: Time slots cannot cross midnight. If your cheap rate runs 00:30–04:30 (Octopus Go), you only need one slot. But if your schedule runs 23:00–05:00, you must split it: Slot 1 = 23:00–00:00, Slot 2 = 00:00–05:00.

Timed export (Selling First): To force export during a specific window (e.g., Octopus Flux peak 16:00–19:00), you must manually enable "Selling First" in SolarMan for that period. This bypasses the home load and exports full PV plus battery power to the grid. This is an advanced configuration — get it wrong and the battery drains into the grid at the wrong time.

Example: Octopus Go schedule

Cheap rate 00:30–04:30. Charge the battery to 100% overnight, then self-consume and discharge through the day.

Slot	Start	End	Power	SOC	Grid
1	00:30	04:30	5000	100%	Yes
2	04:30	23:59	5000	20%	No

Slot 1 charges from grid to 100%. Slot 2 discharges down to 20% (the Shutdown threshold) through the day. System 1 should have Zero Export ticked and Priority Load ticked.

Step 4

Grid settings — UK compliance

Tap the Grid icon. These settings control how the inverter interacts with the UK grid. Grid settings are locked by default — tick "Unlock Grid Settings" and enter the password to make changes.

Grid ModeSet to G99/G100 for UK compliance. Select from the dropdown — "General Standard" is not correct for the UK.

Grid Frequency50Hz (UK standard).

Grid TypeSingle Phase for standard UK domestic installations.

INV Output Voltage230V (UK standard).

Do not change grid settings unless you know what you're doing. Incorrect grid settings can cause the inverter to trip repeatedly, fail to reconnect after a grid outage, or breach G98/G99 compliance. These are typically configured by the installer during commissioning and should not need changing.

Step 5

Lithium BMS settings

If you selected Lithium as battery type, tap the Li BMS icon to verify communication. The BMS page shows battery voltage, current, temperature, total SOC and SOH, and individual cell data.

Key settings when configuring lithium batteries:

ProtocolCAN or RS485 — depends on your battery brand. Most use CAN (e.g., Pylon, Dyness, Sunsynk). Some use RS485 (e.g., GenixGreen, Felicity).

Protocol #The inverter setup number for your specific battery model. Refer to the Sunsynk approved battery list — entering the wrong protocol number causes BMS communication failure.

BMS_Err_StopWhen ticked, the inverter stops charging/discharging if BMS communication is lost. Recommended: leave ticked for safety.

Verify communication: After configuration, check the Li BMS Summary page. You should see valid voltage (e.g., 51.2V for a 48V system), a realistic SOC percentage, and battery temperature. If any field shows 0.0 or blank, the BMS communication cable (CAN or RS485) may be disconnected or the protocol number may be wrong.

Related Sunsynk pages

Sunsynk brand hub →

Battery not charging →

Cheap rate not working →

Sunsynk fault codes →

Useful guides

How battery storage works →

Octopus Flux with solar →

Remote diagnostic service →

FAQ

Sunsynk setup questions

What does Zero Export mean on a Sunsynk inverter?

Zero Export prevents the inverter from sending power back to the grid. The CT coil detects any reverse power flow and the inverter reduces output to match your home load exactly. This is the correct setting for most UK installations unless you have an export tariff like Octopus Flux or SEG.

What should I set Grid Trickle Feed to on a Sunsynk?

For standard UK credit meters, set Grid Trickle Feed to 0W. This setting only needs adjusting for prepayment meters where Reverse Power Detection can cause tripping — in that case, set it to 20–100W. Almost all UK homes should leave this at 0W.

How do I set up Octopus Go or Flux charge times on a Sunsynk?

Go to System Mode, tap System 2, tick User Timer, then set your cheap-rate window (e.g., Octopus Go: 00:30–04:30). Set Power to your inverter's maximum, SOC to 100%, and tick the Grid checkbox. On System 1, tick Zero Export and Priority Load. Time slots cannot cross midnight — split overnight windows into two slots if needed.

What do Shutdown, Low Batt, and Restart mean on a Sunsynk?

Shutdown is the battery reserve SOC — the inverter enters standby mode when the battery drops to this level. Low Batt is the warning threshold where the inverter beeps. Restart is the SOC level the battery must reach before the inverter resumes normal operation after a shutdown. Set Restart higher than Low Batt to prevent the system cycling on and off.

Should I enable Solar Export on my Sunsynk inverter?

Enable Solar Export only if you are on an export tariff (SEG, Octopus Flux, Octopus Agile export). With it enabled, the inverter covers your home load first, charges the battery, then exports surplus. With it disabled, the inverter covers load, charges the battery, and then throttles PV at 100% SOC. Most tariff-optimised systems should enable Solar Export alongside the correct Max Sell Power (export limit).

What is Max Sell Power on a Sunsynk and how do I set it?

Max Sell Power is your grid export limit in watts. For most UK domestic installations under G98, set this to 3600W (3.6kW). If your DNO has granted a G99 export allowance for a higher limit, set it accordingly. This prevents the inverter from exporting more than your connection agreement allows.

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