wolfandy

Correct. You connect the BMS's of your different batteries together (assuming that the batteries are same brand). Should be explained in the manual of your battery See here for the comms connections between my Pylons (the top one is the Master): Correct. But you get all the individual BMS to talk to each other. The BMS of the 'Master' controls the BMS of the other batteries I believe that depends on the battery. On the Pylons, you do not need to change any of the dip switches unless you need to get a hub involved (I think if you have more than 8 batteries). I have not changed any of the dip switches on my 5 Pylons

Have been adding Pylons one by one as I went along. Oldest 664 cycles, newest 114. As long as the BMS are connected (with newest as Master) this is absolutely no problem Am not an expert, but to my understanding this is more for lead acid batteries

I used to run ICC (from ICC) while I had older Axperts in my system. Was generally happy with it. It ran stable most of the time (though every once the comms with the Axperts would hang up and needed a restart). Also used their APM tool to switch my pool pump on/off based on available PV. When I replaced my Axperts with Sunsynks, I switched to SolarAssistant. Have been really happy with it. Not a single hang-up in more than 12 months. It's been running rock solid. In terms of features I would say they are very similar. I have to admit that I prefer the looks of SolarAssistant If I remember correctly, I could get the similar details on my Pylons both on ICC and SolarAssistant (with the Pylons also directly connected to the Pi)

See similar discussion in this thread

I am not the expert, but to my understanding in your case, you can actually easily feed back into the grid (turn the rotary backwards). For as long as your feed does not exceed your grid usage, you should be fine (otherwise the municipality will start complaining). A couple of safety things to consider, but if I were you, I would actively feed back into the grid (which would also offset your trickle feed consumption)

Hi all my installer registered my system as an off-grid SSEG with CoCT when I initially installed my system. I had Axperts at that time and have in the meantime replaced them with Sunsynks. As I have a significant excess PV capacity, I am contemplating the route of selling back to CoCT. But before reaching out to them to register my interest, I want to make sure that my current registration is order and that I do not run into any trouble on that front. Is there anyone that has a better knowledge of this? Thanks and regards

Yes, am doing this on a regular basis especially during heavy loadshedding Am using SolarAssistant to be able to do that remotely whenever I need to

Check out SolarAssistant

I see a similar thing on my stack of 5x US3000 (mix of B and C and different ages). I think it has something to do with battery age (cell health). All of your batteries are at the same voltage, but report different SOC for that voltage

Found the settings 😀 Can you see what your exact settings for high and low voltage are? As you can see from the above, my Sunsynk is set to max. 265V and min. 185V. That range feels too wide for me Would be curious about what others are using for this 😬

I have to admit that I do not know what my Sunsynk is capable of in this regard. Will look into Google for this

Sunsynk - so it synchs with the incoming mains The source is not the problem. The problem is that the inverter synchs the voltage to the incoming Eskom feed - even if I am running fully on solar

Hi all with the current loadshedding situation, I have noticed that my incoming AC voltage is bouncing around all over the place. It on a regular basis goes up to 240V and sometimes even close to 245V. I have now installed a 'smart' 63A breaker between my incoming mains and the rest of my DB board to be able to cut my Eskom feed. During the day I have more than sufficient PV to be off-grid. So am contemplating of programming a timer on that breaker to separate myself from the grid during the day and have my inverter feed 'clean' power to my house. Any downsides to this? And what voltage should I set the inverter to? The standard 230V? Or something different?

Price difference between 1x 8kW and 2x 5kW is not that big I went with 2x 5kW for the extra MPPT flexibility If you have a large roof that is able to take lots of panels in the same direction, then you probably don't have to worry about MPPT flexibility. Otherwise it might come in handy (I have panels mounted in 3 different directions)

Upfront: Agree that the batteries are working without problems in the sense of charging/discharging energy When I in the past added an extra US3000B to an existing stack of US3000B (with the newest as Master), ICC stopped displaying cycles for all but the new battery. When I did a bit of problem finding, I realized that the new battery came with a newer firmware than my older ones. Ones I upgraded the firmware on the older ones to match the newer one, all info was displayed correctly again in ICC (without any changes/updates made to ICC) Similar experience when adding a US3000C and running SolarAssistant But to me this rather points to a comms problem between the different firmware versions of the Pylon and maybe changes to how cycle information is communicated In any case, upgrade the firmware on your older ones and you should be sorted

I also had slight problems with older Pylons not wanting to play nice with newer ones (even among US3000B models). As @PurePower suggested, make sure that all batteries are on the latest firmware - especially your older US3000B. And make sure that one of the US3000C is the master. Then everything should work

Agree with @mzezman - they will work with the Sunsynk Depending on where you are, you might even get away with 9 in series. Maybe check the Victron MPPT calculator tool and also speak to your installer

Cut off the original connector and wired to a basic 12V power supply

On the outside. But the heatsink on my 5kW is different to yours

Advantage 1x 8kW: Higher Amp rating on MPPT Advantage 2x 5kW: 2 additional MPPT, giving more flexibility regarding strings I personally would start off with 1x 5kW and later add a 2nd when funds are available. I don't think that anytime soon you will face the situation that a 'new' 5kW model will be out that cannot be paralleled with the current one Just make sure that you pull sufficient cables (especially for PV from inverter to roof) to cater for a later upgrade

I stuck a 120mm PC fan at the bottom to blow air up along the heatsink at the back of the inverter. Made almost a 10 degrees difference. Mine is simply running 24/7

This is determined by your settings. If your SOC is still above the SOC set for that time of day, then the inverter will take any shortfall between load and solar production from the batteries. My guess is that this is what you are experiencing. If the SOC is below the SOC set for that time of day, then the inverter will take the shortfall from the grid.

I also had Axperts previously with another software on a Pi - but believe me that the SolarAssistant and Sunsynk combination is a very different experience and runs completely stable. Have been running this for about 1.5 years now and never had a single hick-up

Check out SolarAssistant Am really happy with it. In my view definitely worth the extra cost

Here you can see the performance of both string in comparison (yellow line in each chart). Just please pay attention to the different scales in the graph (don't know how to set both to the same scale in SolarAssistant) MPPT 1 is morning sun, MPPT 2 is evening sun - both charts from today