Insulating Timber Garage

[Richard77]

The SunSynk app has been a lot more stable for the last week AGT. They changed servers, it was very up and down before that. 1-2 min refresh rate receiving data now instead of 10 mins.

There is a pro version of the app in the pipeline (probably be subscription based though).

My 8.8kW has been pretty good since install, live chat support is always available on the app if help is needed. They seem ok for the most part.

Negatives:
It does get a bit warm with heavy use (60-75°C if pushed really hard).

The fans are noisy. It would drive me mad if it was inside the house, but it's in the garage so doesn't bother me.

There is no way to control your export rate and AC output separately with this inverter (Don't know how it ever achieved compliance with the DNO... It shouldn't have). The "export power limiter" setting throttles the whole ac output to whatever it's set at, not just how much it exports.

I have a 6kW export limit, so when this is set at 6000W it limits the inverter to outputting 6kW to the house and export. So basically it becomes a 6kW inverter.

If I set it to 8000W I can use the full power of the inverter, but if I force export I have to be careful of breaking my export limit. So I have to manually adjust the export power limiter setting when I want to dump the batteries to the grid. Could probably setup automations in home assistant to automatically do this, but I haven't tried yet. Piss poor from Sunsynk really.

The export power limiter should be locked out from the end user and it is locked out on the inverter screen. You need a 4 digit code to change the setting. Here's the funny thing though.... If you go on the app anyone can change the setting, so the end user can change the export limit at will, whenever they want and to whatever they want.

Again.... How the hell did this inverter get any sort of DNO compliance approval? God knows!

Any questions about it feel free to ask and I will try to answer.

[AGT]

Appreciate the reply Richard.

My set up is in my garage/workshop, I have a slope pitched roof with an extractor fan up high and plan on blowing air across the inverter anyway to keep cool.

I don’t really understand the export stuff/settings so that’s some homework!
To be honest if I can reduce my peak consumption first i will
Be happy and then may look at export.

[AGT]

Internet search

Here’s a sheet for your Sunsynk 8.8kW ECCO inverter + 32kWh battery, designed to store solar energy for evening use while avoiding unnecessary export during the day.

⸻

Sunsynk 8.8kW + 32kWh Battery: Smart Daily Strategy (UK Setup)

Goal: Charge from solar during the day, reserve battery for evening, export optional.

⸻

1. Battery Time-of-Use (TOU) Settings

Menu: Battery Settings > TOU
Time Slot
Charge
Discharge
Purpose
00:00–07:00
ON
OFF
Optional grid charge if on cheap tariff (Octopus Go etc.)
07:00–16:00
ON
OFF
Solar charges battery only
16:00–23:00
OFF
ON
Discharge battery to power home during peak time
23:00–00:00
OFF
OFF
Rest battery

Optional: Enable charge 00:00–04:30 if you have a cheap overnight rate.

⸻

2. Battery SOC Limits

Menu: Battery Settings > SOC Limits
Setting
Value
Max SOC
90%
Min SOC
20%
Discharge Cut-Off
20%

Keeps reserve, avoids deep discharge, and leaves headroom during the day.

⸻

3. Export Settings

Menu: Grid Settings > Export Control

Option A: No Export (Battery First Strategy)
• Enable Export: No (Zero Export Mode)
• Export Limit: 0W

Option B: Export Surplus After Battery Full (SEG Enabled)
Enable Export: Yes
• Export Limit: Up to DNO-approved level (e.g. 3.68kW or unlimited if G99-approved)

CT Clamp: Must be installed correctly on main incoming grid line, facing the correct direction.

⸻

4. Power Flow Priority

The inverter naturally follows this logic:
1. Power home loads first
2. Charge battery
3. Export surplus (if export is enabled)

⸻

5. Optional Smart Strategy Add-Ons
• Smart EV Charging: Schedule EV to charge 11:00–15:00 from solar.
• Hot Water: Use diverter (e.g., MyEnergi Eddi) to store excess as heat.
• Peak Tariff Export (Octopus Flux): Add TOU discharge to grid 16:00–19:00 to export stored energy at peak rates.

⸻

System Health Tips
• Update firmware regularly (via Sunsynk/Solarman)
• Monitor with Solarman Smart app or Sunsynk Connect
• Check CT clamp alignment if export/import readings seem off

[Richard77]

I have it setup like this:


I usually set the charge amps for the battery to around 140A and have a 4.5 hour window between 01:00-05:30. That's plenty of time to fill the batteries to 100% to start the next day.

Any excess solar is auto exported.

Then I manually force export from batteries, around 21:00 or 22:00, so that they go down to 20% after 23:30 (when cheap rate starts).

I always discharge down to 20% each night and always fill back to 100% before the morning.

If the weather is good, my panels generate around 10-15kWh a day.

Import seems to be 30kWh ish daily. (Fill the batteries/power house when batteries are charging (all at off peak 7p) and not including charging EV (as always get at 7p no matter what time IOG).

Export seems to be 20kWh ish daily. (When weather good... 5/6kWh + PV generated = daily export)

If I have to charge the EV during the day, I will manually dump the batteries to 20%, then charge batteries and the EV at the same time. Then dump the excess again before bed!

This seems to be working ok for me now. Just need to automate the dumping / changing export power limit process in home assistant, then I will be golden and not have to touch the thing.

Basic timer settings are easy to setup on the inverter screen or using SunSynk app.

[AGT]

That sounds like a good plan.
I have to factor in storage heater input as well as EV
But won’t know until I start , appreciate the info