Cannot find inverter for my panels

[AndyS]

I have an existing solar system: 28 panels (2 strings 6 + 22) and a 10 kW 3-phase grid-tied inverter. I want to replace the inverter with a hybrid one to connect a battery, but do not want to touch the panels. I'm struggling to find a 10 kW 3-phase hybrid inverter that will support the input DC current coming from the panels. Looking at historical data, one string peaks at 16 A and the other at 27 A. My current grid-tied inverter easily handles that as it supports 32 A per MPPT. Most 10 kW 3-phase hybrid inverter I'm finding are 16 A per MPPT or a bit more, but none can handle (16 A or more) / (27 A or more).

My questions are:

1. Is there an inverter out there that would meet my requirements?

2. What will happen if I connect an inverter that cannot handle the current? Will it just clip the panels' output? Or will it burn out?

[littleharbor2]

It sounds like you're unsure about the configuration of your solar array no single string would be 27 amps that's combined strings for sure so you will definitely need to rewire and concentrate more on the voltage to meet the requirements of the inverter individual panels and individual strings probably would max out no more than about 12AMPS with the large format panels these days look and see if there's a combiner box on your roof or somewhere in the system and find somebody who knows PV system wiring to help you figure it out.

[AndyS]

Hi littleharbor2, thank you very much for your reply.

My inverter supports 2 MPPTs, 2 strings per MPPT. On the below image you can see that only one of the two strings per MPPT is connected:

image.png
Unless two strings are connected somewhere at the roof and then come to the inverter as one pair of wires? Is it possible?

Rather than strings, let's look at MPPTs. On the below graph you can see that they both can go over 16 A. For MPPT1 it's a very rare case so 16 A is a maximum, while MPPT2 goes above 24 A on the graph and generally peaks at 27 A. No matter how I rewire, wouldn't I need more than 16 A on each MPPT anyway?

image.png

[littleharbor2]

Grid tie and three phase is not really in my field of expertise. I'm curious though what model and brand is your three phase grid tie inverter? Interesting looking input terminals

[AndyS]

My inverter is Solis S5-GR3P10K-AU: https://www.solisinverters.au/produc...S5-GR3P(5-20)K

Someone pointed out to me that I must have some panels connected in parallel. I looked at my layout and it makes total sense. I have panels on two roof sides. One side has 6 panels - that's one string producing ~15 ADC / ~200 VDC. Another side has 22 panels producing ~30 ADC / ~400 VDC. Those 22 panels must be split into two strings connected in parallel and then connected to the inverter with one pair of wires. If one string produces ~15 ADC then two parallel strings would produce ~30 ADC. If 6-panel string produces ~200 VDC then 11-panel string would produce almost 400 VDC. Everything matches up.

I have emailed the installer to confirm that that's how he installed the panels, and to ask if 22 panels can be rewired from two parallel 11-panel strings to one 22-panel string. Then the current will halve to ~15 ADC, which is within pretty much all inverters' range, and the voltage will double to ~800 VDC (a bit less actually), which is also within all inverter's supported range.

Here are the specs of the inverter I'm looking to replace my current inverter with. Seems it should work fine with two strings producing ~15 ADC / ~200 VDC and ~15 ADC / ~750 VDC?

image.png

Full specs are here: https://support.ankersolix.com/s/dow...-for-Australia. The model I'm looking at is X1-H10K-T. Would appreciate comments what people think.