Chris Hobson

Ok so the only thing I can think is physical. If you switch the slave off does the master take over the load?

That is weird. Are you sure that the two machines are paralleled? You need to switch off the unit when programming it to get it into parallel mode.

Here is a parallel of a 4kW installation I assume pretty much the same Parallel-installation-AxpertKS+MKS-4K-5K-20141014.pdf

You can connect multiple inverters to Solar Log the German logger I am not sure of the Huawei product - It was only released in SA after I did the install.

I would aim at a smaller 150W or 250W panel and a small MPPT. Three 250W panels would have the ability to charge at 50A - way more than one or two batteries could absorb unless they are serious >200Ah boykies. Plus it they are in series you have a big panel battery voltage mismatch and if they are in parallel we now talking slightly thicker cables (6mm2) and moderate amps.

Yes within reason make sure you take temp compensation into account when calculating your max PV voltage. At 20m standard 4mm2 should be fine. They should know better double insulated PV wire.

Hi You install a Huawei Smartlogger and enable its grid limiter function. It then gets the mix of solar and Eskom right so that you do not feed into the grid. Yesterday visited a Huawei install I did in April and tweaked some of the settings.

Huaweis don't pass current they augment current to the max of their ability. So if the inverter is producing 25kW and the load is 75kW then 50kW comes from Eskom. The 50kW does not pass through the inverter. The inverter's output is added to eskom rather than the otherway around.

Pylons can warm their own cells not something I really worry about but since large parts of China the Mercury drops like it is in freefall its clever that they thought of that. My brother is a deputy headmaster for an international school in China and he and the family attended the Harbin Ice Festival where the temperatures were a balmy -22°C.

Here in the Karoo it was 5° but I made it 10° so that the panels would self-clean.

You got me there - I see it was one in the morning.

Battery bulk voltage will be determined by you batteries' datasheet rather than the Axpert manual.

These have a quoted 1000 cycles at 50% DOD. Not bad - batteries with training wheels so to speak. These have no datasheet I would steer clear of them.

I have a 4 season tilt which cost about 100 bucks and a reminder on Outlook to change the panels. I can do it as it needs a bit of labour.

i.e 12 degrees in normal speak. I suppose I must accept that different parts of the world measure the other angle.

In series you add volts in parallel you add amps. The figures in your diagram are correct. If you using Synerji inverters then 2 panels is probably your max. I see that each array is for one inverter.

I have no experience with BYD but a pylontech has all the cables you need to connect modules. You need a cable pack (about R300) to connect your battery bank to inverter.

An East West array is great, an idea that eminates from Germany in about 2012, and you can connect them to a single SCC with some provisos (which are hard to meet in a domestic situation perfect East West orientation being one of them).

No not necessary it was visible on the BMV and the inverter's own voltmeter. Like I said serious ripple. Ill try and find a video.

I would speak to your supplier. Updating firmware can be traumatic and I know of an Aussie user that bricked his module. I have 4 batteries with 2 different firmwares. Yes there are some idiosyncrasies but essentially they work. It is not an arena I would rush into.

I would only have panels facing different directions if you have more than one SCC.

Yes 100% In Australia and the US it is common to overspec ones panels. Here it is rarer. @Sidewinder I think overspeced by 25% and had no problems. I think one can go to about 30%.

My biggest gripe with the Synerji is that in absorb it had serious DC ripple (up to 2V within 10-15 seconds). https://www.youtube.com/watch?v=UFaDvUOeIgo

One cannot really comment unless one knows what SCC you will be using. basically you have 12 strings consisting of 2 panels in series. You either going to need lots of inline fuses or you going to need a massive combiner box. 2 panels in series is likely only going to suit an Axpert or a smaller Victon or the like. I would like to see 8 panels in series if possible.

You need to answer whether you want to go hybrid or GTI route first as Phil has pointed out.