Technical Support

We have 2 x 5kW Hybrid inverters in single phase parallel operation with Master unit fitted with 2 strings of 7 series 375W panels ( 5.25kWp), Slave with 1 string of 7 series panels (2.62kWp), 2 x Pylontech US3000C for 7kWh storage. Master set as CAN add 01 and slave as CAN add 02 with parallel enabled.

1. Inverters internal current measurement looks generally good but external CT power typically wrong and load power typically wrong.

- Measured with clamp meter and Effergy meter on grid incoming supply and compared to Inverters reported grid power and reported CT watts

2. When grid is turned off system supplies all load but when switching grid back on only a portion of the load is supplied by inverters although battery is fully charged and ample PV power available.

Can anyone please assist.

Things that have already been tried:

1. Change CT direction (both physically and on wiring (i.e. White (3), Black (4) and vise versa)

2. Have firmware updated by Deye. Protocol Version：V0.2.0.1, Control Software Version 1：V3.1.6.2, Communication CPU Software Version：VC.3.4.A (Note that asking for support from Deye via phone is no use (Numbers provided on their website go unanswered, as well as email support very slow and generally non responsive)

3. Multiple setting options including: Zero Export to Load, Zero Export to CT, Zero Export power changed from 0, 50, 100, 250 etc. Solar Sell set off, Max Sell power set from 5000 to 0, Time of use enabled and disabled, Load First and Bat First priorities,

Other observations:

1. When changing CT coil direction, system does not use PV for some time and same troubles as in another thread: CT coil behaviour | Sunsynk

2. When battery is fully charged, indicating 100% on HMI, there is still a high consumption of power shown, have seen figures as high as 800W. Entering the details of master slave shows one unit charging and the other discharging.

3. The 2 x Pylontech 3000C batteries have a unsynchronized LED display. When turning on via power switches and then pressing start button on top unit, both batteries LEDs come on indicating they are active but then the flashing sequence becomes out of sync between the two batteries.

Below is a simplified diagram of the installation for clarity.