TimCam

Hello, and welcome to the forum. Do you just install, or do you have a system at home?

Is it Not "Kalahari Meerkat" ? 🤔

In my area in KZN Midlands the voltage swings wildly. I have had highs up to 270V, but have Under & Over Voltage protection before the inverter which is set to a range of 180V to 266V. The SunSynk 8.8 kW inverter handles this range without problems. Currently as I type this, the Voltage is at 250.4V. See Below:-

Have a look here:- https://www.electrical4u.net/calculator/busbar-current-calculator-online/ About 50mm x 10mm copper will take your max battery load.👍

Fuses are preferred. On the diagram above, between the batteries and bus bars, replace the "MCB DC100A" with 125A fuses, and use 35mm2 cabling. Throw out the 210A MCB in the combiner box, and wire directly from the bus bars through 50mm2 cabling and 200A to 230A fuses to each inverter individually. *Note* Each 8.8 kW inverter can draw up to 185A from the batteries, so 160A fuses or CB is under spec'ed. Fuses or CB's are not there to disconnect the inverter from batteries when the batteries are providing the load, but only as a last form of protection. To disconnect the batteries for "maintenance, etc" the batteries must not be under load, and be switched off at the battery first, then fuses or CB can be disconnected.

A bit of DIY is OK, but you are installing electrical kit that needs a Certificate Of Compliance. Looking at the picture, the bus bars look under spec to carry 500A, and wires look thin too. I would get heavier bus bars, and use 35mm2 cable from the individual batteries to the bus bars. Each battery fused through a 125A fuse to the bus bars. (Note all battery cables of the same length) From the bus bars to each inverter use 50mm2 cable through a 230A fuse or CB. If you are in JHB area a good idea would be to contact @Leshen or @Steve87.

I was going to say SunSynk software is a bit more refined, but better not say that.... 😂

I'll have to ask my Deye friend if his master propagates setting to the slave? The way he explained it, sounded like he has to set up the slave separately. 🤔

Unfortunately that is a huge limitation, especially for 3x 8.8 kW machines. Is this a new install or an expansion? If a new install, call the installer and have him upgrade the Battery DC installation. If an expansion, the same problem, as the Battery side needs upgrading. Currently your inverters can supply 26.4 kW of power, when powered from batteries only. Your batteries can supply 25 kW which is fine. The problem is your DC battery wiring and fuses limit you to 11.5 kW. With the current setup you will have to set each inverters Discharge to 76A for a combined current from the batteries of 228A. This will power a load of about 11.4 kW from the batteries.

Set your Charge on each inverter to 70A, for a total of 210A provided together by all three inverters to the common DC battery bus. If you do the same on the Discharge setting you will limit the combined output of your inverters to +- 10500W, and possibly cause them to trip off. On the 8.8 kW inverter the MAX you can set on the Discharge is 185A per inverter, but with your battery limit of 500A, I'd suggest setting each inverter Discharge to 166A. I don't have a Deye inverter or parallel setup on my SunSynk, but a friend with parallel 5K Deye's sets his Charge like this.

Check in your Settings, Grid Setup, Grid Type, then look for Grid Reconnect Time. This is normally set to 60 seconds, yours sounds like it's set way higher. If it's not 60s adjust it down 60s, and see what happens during the next load-shedding, or test by switching your mains MCB off and on again. Oh, and welcome to the forum, and Power independence, especially when you get panels too. 👍

If you are looking for 3 phase power, you could get 3x 50kW SunSynk inverters and set them up as 3 phase, or parallel them for 150 kW single phase. SunSynk has distribution and repair facilities is South Africa which is a plus. Kstar has a few distributors of UPS in South Africa.

@Meerkat Congratulations. A good piece of Victron kit found a good home. 👍

Enable the "Gen Charge" with a tick, like "Grid Charge" is ticked. You will then notice the left hand "Amps" 40A is no longer greyed out. Change this down to 10A, or your generator might complain if there are high house loads. 10A = about 500W charging the battery, 40A = about 2000W into the battery. Note with Lithium batteries, calculation between 48V to 53V, therefore use 50V for calculation. If you push the battery charging to hard, the inverter will disengage now and again, as fridges and freezers switch on/off, and the generator battles to maintain a good frequency. If this happens too often (annoys you) drop the Amps a little lower.

Maybe high levels of RF affecting LED's driver circuitry? Plenty 2G and 5G RF even from local house routers. 🤔 Not enough power to drive 3W LED's but enough for the 1W LED's.

Possibly an earth neutral bonding issue. I have seen LED lights "glow" even with the light switch OFF when on generator or inverter without earth neutral bonding.

Good to see local users and installers supporting locally grown products which are world class.

What protocol / emulation are you using on the BMS to satisfy the SunSynk inverter? Looking like a great and enjoyable project for you guys and the customer. 👍

16kW is a beast, lucky you. All connections can be essential. 😄

MAX PV Isc, So its advisable not to go above this value. But this is not the usable Isc. Usable Isc is 20A.

The SunSynk 8.8 kW will clip the Amps at 20A per MPPT. On the old software (as mine is), and the latest software. Last year when 22A was "allowed", the MPPT's were unstable according to Kieth, I think I read somewhere, so latest is back to 20. My MPPT's absolutely clip at 20A's every time on my graphs. The clipping can be seen below. This is 12x 415W Canadian panels set as S6 2P, so Voltage is low. Will one day complete as S9 2P.

I'm using Canadian 415W panels with a VOC of 47.8V and an ISC of 11.14A. My aim once complete will be to have 36 panels connected as 9S 2P per string giving a total of 14940 kWp The unusable power during good days is irrelevant to me as the KZN midlands has plenty of bad weather days, where the large kWp will help. The total VOC per string will be 430.2V and ISC will be 22.28A. I am willing to loose the 2,28A on good days. You will have to decide according to finances and use case. 👍

Good piece of "Blue Team" kit. Someone will be very happy with it. 👍

On the LeroyMerlin website it states:- "This is the best home generator during load shedding. It can run on petrol or LP Gas. As a gas generator you are able to run up to 8000w of appliances." As a South African that would mean as an LP Gas generator, but as an American that would mean as a petrol generator. 🤔 Best to phone and find out about the specs.

I'm not sure if the issue of parallel inverters and generator input has been solved yet, but you can always connect the generator to the mains input via a change-over switch. Open up your Voltage and Frequency parameters on the mains settings, and be gentile on the charging current for a start. Be kind to the generator when charging batteries, and running house loads, or the frequency will fluctuate, and the inverters will disconnect and connect often.👍