Sunsynk (DEYE) Hybrid Inverters

Experimenting with dumping some excess from batteries for about an hour before nightly grid charging from 2am-6am, with a 5kW Deye, but have noticed something odd.

When I set working mode to "Selling first", inverter dumps from battery up to Max sell power. During this, the "house load" on the inverter drops to near 0 (which obviously, isn't accurate). After a while (about 15 mins in the example attached), export stops, and the load power as seen by the inverter sticks at 0. An automation switches the mode back to its usual Zero export to CT at 2am and meter readings return to normal.

Anyone seen something similar? Unsure if its the meter or a setting. Using a 120CT which works great other than this.

I don’t think so. Timers settings:

I suppose I’m wondering what behaviours other see when “selling first”

Yeah, Inverter + pack’s actual BMS SOCs are the same, so perhaps not that. Lifepo packs.

i must take a look to see what the Easton meter says while dumping. If it helps any, general solar excess has worked fine without any weirdness around load numbers for the “house” load.

Just got a new Sunsynk ECCO 5kW with 15kWh DIY battery+JK Inverter BMS operational over the last couple of days. The main remaining task for me is to automate exporting battery remaining amp hours to grid late at night. Next step is to integrate with HA, which might help with that.

So this now seems to be the norm for me (except 2->5AM when battery is being charged)

The other interesting thing is the following (even at low power)

Its easy to see the constant 15kHz for the inverter @ ~50dB. Ambient was ~30dB when Inverter was turned off. Fortunately, it is in the garage & I cannot hear anything, but OH says it is annoying for her. However garage also has washing machine, dryer, fridge, water pumps etc.

Other things of note:

• difficult to get full 120A charge at night seems to be closer to 83A. I will double check settings later after HA integration.
• Inverter Temperatures seem to max out at 75 degC for DC & 67 degC for AC during overnight charging.
• I have just the Inverter & battery (no solar)
• Bord Gais stats are reporting no details available for many periods during the day. Presumably, they have error checking algorithms looking for bad records from ESBN???. Interestingly, they appear to apply a €0.02 charge in some cases as a min charge. I expect this will be cleared up later once they figure out that it is not an error.
• ESBN also seem to have stopped reporting since the battery came online.
• JK Inverter BMS is connected via CAN to Inverter (protocol 0)
• RS485 ready to connect to HA via DIY cat6 cable (with CAN/RS485 wires split)
• Currently happy with set-up.

Thanks to all here on Boards.ie for all the useful tips etc.

Just activated low noise (under battery settings). Noise has now shifted to 20kHz.

OH cannot hear it, 30 year old son can still hear it (says it is slightly different). So now not really an issue for us.

Thanks for the tip. I will chase down the charging issues later once I have HA set up.

PS: The inverter alarm went off as I made this change. Not sure if it is related to this and/or because I had a 7kW+ load running at the same time. Just restarted the Inverter and it cleared the alarm.

Based on the log it seems the change caused it.

18:17:07 Grid_Mode_changed

Below are a set of charts from the Inverter perspective, showing the charge cycle from 2 to 5 AM.

As I have only just started I might have to do a full top balance and wait a few cycles before the BMS characterises the Battery capacity properly.

Battery Voltage (peaked at 55.7V)

Battery Current (Max charge current 86.7 A)

Battery SoC (Peaked at 100%)

Battery Power (~4.7kW)

I had one and I couldn’t find any such setting. I have since reverted back to the CT with one leg connect to ground and I’m always exporting about 40w.