Issues when having two Skylla-i 24/80A 1+1 battery chargers connected in parallel

DIY
, , , , ,
1

Hi all,

I have 2 x Skylla-i 24/80A 1+1 output battery chargers (Firmware version v2.07) connected in parallel, 1 x Cerbo GX (Firmware version v3.50) and 1 x Skylla-i Control (Firmware version v2.01) connected to a battery bank.

1 – both Skylla chargers work as expected when used individually, no problem there.

2 – but, when connected in parallel (shown by the LEDs on both units flickering), the combined charge current seems to be similar than that of a single unit, when one would expect it to be almost double.

The shore current on the Skylla-i Control and Cerbo GX cannot be set higher than 16A (the maximum of a single unit) and the current delivered to the batteries is 80A (the maximum of a single unit as well)

One would expect the max charge current to be 160A when working in parallel.

Each units go to full charge capacity (80A) when the other unit is switched off. When both are switched on, they equal out to 40A charge each. This reading is also shown on the front panel LEDs of the Skyllas.

In the manual, on page 8, paragraph 2.3.6 Synchronised parallel operation it states the following:

“The shore current limit of the parallel charger group can be set with the Skylla-i control panel. The current limit as shown on the panel is the shore current of the group.”

The problem is that it cannot be set higher than the current limit of a single unit, in my case 16A. For the group, it should be 32A. Setting it from the Gerbo GX or Skylla-i control panel, it just jumps back to 16A when entering a larger value.

The dip switch settings on both Skylla-i units are:

1 - off

2 - off

3 - off

4 - off

5 - off

6 - on

Rotary Switch:

I tried both positions 0 and 8.

Does anyone have ideas to resolve this?

2

After months of struggling and trying every possible solution—including reaching out to the Victron distributors in South Africa, who were completely unhelpful—I finally managed to resolve the issue out of sheer frustration. In my desperation, I performed a factory reset on both Skylla-i chargers, and voilà, it now works.