PowerUser

Good to know, they didn’t ask for and one doesn’t have to carry the whole inverter (to check for warranties, etc.).

Did you just take the CT coil with you or the whole inverter?

How old is your firmware? Maybe you haven't upgraded to a recent version which allows 13A per MPPT.

The MPPT on the SunSynk 5kW is rated for 13A with the latest versions of the firmware. The same should apply for the Deye as well. They are the same inverter.

You can have maximum of 8 of those panels on 1 string. 9 is already over the limit.

@Jeppe out of interest, what brand are the panels, what is their orientation and tilt angle?

As far as I know, sometimes the MPPT short circuits the PV in order to prevent battery charge. In this case the Isc of the panels shouldn’t exceed the Isc of the spec above.

You need changeover switch to bypassing the inverter in case of a failure.

You see Isc specs on the panels. Not on the MPPT. The spec on the MPPT is for Imp in order to match the best panels for what your MPPT can draw. It is not good to connect panels with Imp of 8A to a 13A MPPT because even at full power these panels won’t reach the power potential of the MPPT. Also, it’s not good to connect panels with 16A Imp to a 13A MPPT because in that case, your MPPT won’t be able to draw the full power from those panels. Look at it this way - you have a main MCB from Eskom coming to your house at 63A. If you connect just a fridge and nothing else, you will draw let’s say only 1A. The fridge does not absorb the rest 62A of the current from Eskom and it won’t get damaged. It just doesn’t draw the extra power. The same happens if you have panels which can provide more current connected to a lower spec MPPT.

The inverter does not absorb any extra current. Such current is never produced because the resistance on the MPPT won’t allow it. Panels don’t produce current. They produce voltage. Current flows based on resistance of the load. I=V/R

That’s not exactly correct. The inverter can only process 6500W PV power. You can put more potential power in panels, as long as you don’t exceed the maximum voltage per MPPT and the current is close to the MPPT range. On a 5kW SunSynk, you can put 2 strings of 8 x CS 550W. Total 8800W. This is still within the acceptable values for the inverter. It will draw at most 6500W but you will have extra power in cloudy days.

Yes, that reading looks odd. @iOddJobBob is it possible to check the directions on the arrows on the CT coils and the way they are connected in inverter?

@iOddJobBob what’s the firmware version on the inverter?

If you look at the graph, the OP doesn’t have the issue with loosing charge.

Part of the blame is on the ignorant owners too. How can you not do at least a basic research first? How do you allow someone to install panels facing south if you have space facing north? Some of these things are common sense. No electrical knowledge required. It is your house at the end of the day.

HomeAssistant is releasing version 2023.8 tomorrow and one of the new features is AI integration. That might be an option to control the geyser in a similar way of the above product.

I'm afraid the above is incorrect. The SP devices have several protection circuits inside, which operate at different situations. The devices can activate and clip the voltage multiple times and still work fine afterwards. They are not a simple fuse device which blows off ones and turn red. Do your research. There are many sources on the net which explain their operation in detail.

Based on the below specs for the 5kW is it not better to spec it for 450V instead of 500V? I’m not quite sure what happens between 425V and 500V? Does the MPPT stop producing any power? Do you happen to know?

What size battery and what inverter? That fuse is rated only for 80A.

Slave is the default setting for a standalone inverter. It should stay that way.

Thank you! Found them in the Hager catalog:

Can you please tell us the exact name or model no.?

That’s a very interesting question. I would like to know the answer too.

What can this Solis do, which SunSynk cannot?

Yes that is annoying for me too. Since I want them to appear in my stats - with grid present, any excess power needs beyond 8,000w (per setting) will be taken from the grid. i.e. with grid present, these non-essentials won't overload the inverter and with grid gone, they fall away anyway. I wonder if this is a limitation in the SunSynk app. I’m using SOLARMAN with my inverter and I can see everything - essential and non-essential loads. Or maybe your CT is not installed at the right place.