P1000

Some of those higher capacity batteries have non-standard discharge curves. From those that I have looked at, all the extra capacity was below the voltage cutoff for the BMSs I could get, so it would have been a complete waste of money to opt for them.

The primary problem is not the quality of the cells, it's that those batteries don't have balancers in them. I have considered buying ingco batteries to harvest the cells - they are currently the cheapest source locally.

Do you mean the GW5048D-ES? Yes it is NRS-097 certified. Just search for "NRS 097 Approved inverter list" and the CT list will pop up with a table of approved inverters with their report number and certificate number.

The Staubli connectors that come with the panels are about as premium as they get, they stuff that is usually mated to it is usually far from it. The connectors have a completely different structure than what you get in a typical wall plug - look inside the female and you will see they have a number of spiral or straight contacts made from plated spring material. This arrangement ensures much better contact than the (usually 2) contacts in an AC socket. I'm pretty sure that's not true, and also the source of many of the problems.

Most likely because the mating connectors weren't compatible, or badly crimped. This is the biggest risk with poor installations. Ideally all mating connectors should be of the same manufacturer and same series. Rule of thumb is that if it has a red oring, it's not genuine Staubli (most likely what the Canadian solar panels came with) - if it has a black oring it might be. It's worth paying the exorbitant prices for Staubli connectors and proper crimping tools if it means your house won't burn down.

Yeah, please don't install any switch-gear that is not certified to the standards required in your country (or at the very least the equivalent ISO standard if you are willing to do the research and take on the risk.) Even if it is a completely off-grid installation. Something like this can quickly turn into a fire. It's also a good idea to check all your terminals annually and tighten them, thermal cycling can cause them to work loose, leading to a situation like this. On a side note - there are no affordable certified ATS (that I could find) - those that were certified cost about as much as an 8kW NRS097 hybrid inverter. So my suggestion is to rather design your system so that it does not require an ATS. You can use contactors, but not in the same way as you would an ATS. IOW, you cannot use a NC and NO contactor to function as an ATS, since they cannot guarantee interlocking/break before make.

I would guess that the battery is disconnecting due to a cell over-voltage event.

There is someone on another forum that claims he can generate an unlock code for a fee (and also many that doubt this claim). Also another that claims he got a code directly from DEYE: https://diysolarforum.com/threads/china-kills-all-non-sol-ark-branded-deye-unit-in-the-usa-this-morning.94349/page-100

The fact that he can discharge the batteries makes me think it's more likely to be the BMSs. The BMS can stop current in one direction, the bidirectional inverter cannot really fail that way - all the components are used for both directions (unless perhaps the software is detecting a problem and disallowing charging).

Technically, you are not allowed to increase the supply - if your eskom supply is 150A, then that is the maximum breaker you may install anywhere in the system. The solar is not allowed to supplement above that limit. (But nobody pays attention to that, so do whatever you want.)

That's the nice thing about open source software. If you want a feature that is missing - you can add it yourself.

You can check here and filter for the parameters you need, there is one that meets the requirements but is 45mm tall: https://za.rs-online.com/web/c/passive-components/capacitors/aluminium-capacitors/?pn=1&rpp=20&selectedNavigation=attributes.Capacitance=15000µF^attributes.Diameter=25mm They are all snap-in, which i

Me too. The MPPT in the Sunsynk/deye goes to the HV DC Bus. There is another isolated DC/DC bridge (bidirectional) that couples the battery to the HV DC bus. It's not the same as with the low frequency Victron solution (although the new RS is probably a similar topology).

Not quite - it's output is the DC bus voltage, which should be around 330V (the exact voltage depends on your AC voltage and some other factors). Apart from that, it's under software control, meaning that the response time is limited. So there exists the possibility that the current might overshoot the capability of the hardware - possibly saturating the inductor and killing the IGBT before the software even knows about it - that is why there is a Isc limit.

And the picture you attached (which is also what is usually used with multimeters) is a thermocouple, which is not a thermistor. It does not change resistance with temperature, or at least that's not how it is used to measure temperature - it generates a voltage by the thermocouple effect when two dissimilar metals are joined. Most multimeters use k-type thermocouples. So in this case, it might just be necessary to swap the positive and negative leads of the probe. Looking at the Toptronic T48, it seems that it uses a proprietary connection for the probe: https://www.hellermanntyton.co.za/products/digital-multimeters/tbmtempprobe/911-01867 Though, I'm not sure if the website is correct, because I don't see where it plugs into the multimeter: https://www.hellermanntyton.co.za/products/digital-multimeters/t48/911-00004 According to the manual, it mentions two connections, so I guess the linked probe is not correct. http://mail.hellermanntyton.co.za/download/manuals/t48-digital-multimeter.pdf