MrVolt

Volt drop through the battery cable and fuse/fuse holder is 0.7V on both positive and negative. I actually measured voltage on the BMS board and it's 53.8V. I suspect an internal BMS fault.

Hi all, Hope someone with the same combo can help. I have a Sunsynk 8kW with a SolarMD 14kWh battery. System has been running flawlessly for 18months. Now I am getting a f14 error on the sunksynk the moment grid fails and battery should discharge. The inverter was booked in at Sunsynk and they gave an all clear, no issues or faulted components. What I have picked up is the voltage on the battery terminals of the inverter and battery busbars os different from the voltage communicated by the BMS to he inverter. Measured voltage on terminals: 53.8V BMS voltage: 51.9V I think this is the cause, anybody experienced this?

Hi All, Last night after (20:00) when power was restored from loadshedding my main earth leakage tripped and the 8kW Sunsynk showed a F26 (Bus Unbalance) fault. The load side of the inverter switched off and after 1min (more or less) restored itself. Since last night we had loadshedding again this morning with no faults. I have a Earth Neutral bonding contactor installed with the signal island mode output from the sunsynk. Any ideas, should I be worried? Thanks

Thanks, this is useful for victron integration. But what i am actually after is which local battery is preferred and which is best supported?

Hi All, What is the general / technical feeling on the "best" or most widely used local lithium battery specifically for Victron installations? This would refer to Solar MD, Blue Nova and Freedom Won. Thanks

Hi Does anyone know if the hexing prepaid meters plat nice with solar systems? Or does it behave similar to the conlogs - tripping? Specifically the HXP100DI hexing Meter. Thanks

A possible solution is to use a 250A fuse disconnect for each of the BYD cabinets. In this system there are two cabinets of 4 cells each, so a 250A fuse will give 60A per cell. 250x48=12kW x2 = 24kW (thats the same as three 10kVA quattros.)

Yes I agree, I missed that. Another option is to use the mega fuse links from victron. But then there is no disconnect option. I did find a DC on/off switch but it's only rated at 200A/48V.

Maybe a option is to use two 250A double poles disconnects, that way you can break three phases and one common neutral with the four poles?

Any idea where one can source 250A single pole fuse disconnects?

Is the above table per inverter in a system. So in a three phase system each inverter has its own fuse disconnect? Again Victron has another view on this: Which is right then for SA? What would the size be if only one fuse disconnect is used then? Also most Lithium batteries does have on board disconnects, is it still necessary for fuse disconnects or can the Victron Mega fuses be used? they are much cheaper.

Hi all I'm getting different info all over. Regarding the fuse disconnect between the battery and inverter. To my understanding it is there to protect the cable, but in the event that the inverter (Quattro 10kVA) can surge to 20kVA - 400A and the battery can handle this, surely the fuse to use is 400A. If the battery (BYD 20KWh) can go max 280A, then a 250A fuse disconnect per inverter should suffice? One should the also limit current draw in the inverter? Am i correct on the above?

@plonkster You mention the older SMA firmware will not work, i assume a new sunny boy with updated firmware will work with the GX, only for data capturing? Considering the 3 phase system i mention above, and replace the fronius with SMA, so L1-Quattro, L2-SMA, L3-SMA. Can the SMA inverters be set to limit export but still log data to the GX? And can SMA inverters be connected in parallel?

Ok thanks A different approach would be to use two Fronius primo's 8.2kW on L2 and L3, then a 10kVA Quattro on L1 with DC coupled PV. Does the GX setup specify which fronius is on which phase? How would phase compensation work in this system?

Question on the Fronius Symo 3phase inverter, I assume it will also limit supply to that of the lowest phase? Ex. L1 - 5kW, L2 - 7kW and L3 - 2kW, will it then only supply 2kW on all three phases? For a Fronius Symo 10kW, is then 10kW per phase or 10kW total meaning 3.3kW per phase?

@Zialmen Can you possibly give me info on this victron/hoymiles config. Thanks

Not sure what you mean here, is it because there is a 3phase energy meter that measures the main consumption? This is the same meter that controls the victron, so export on the other phases and the victron will import to balance the phases? We are billed on the total consumption, but you cant go into negative readings on two of the phases. If the PV inverters are on separate phases than the victron as in the picture, wont they also operate separately in terms of grid limiting and import/export?

I made a drawing of what id like to achieve. From the feedback you gave I know it will work, thanks. All that I'm not clear on is whether the GX device will show the PV inverter (Hoymiles) data as the screenshot in the post #4 above.

Ok thanks. Best then to enable export or just let the hoymiles do limiting and the quattro to feed in? On my question regarding 2 phases on hoymiles and one on the quattro, will this not be a better solution? If thats the case, still only one 3phase meter is used for data logging on the hoymiles side and logging on the quattro side? Not sure if you can set the GX to which phase is which system on the meter?

Could this deadlock/situation be prevented if going for 2 phases on hoymiles system with a Meter to log data to the GX and then the third phase on a DC coupled Quattro system?

Thanks for the replies I read the whole CCGX manual now and saw you can use a meter to get the pv inverter data onto the gx. Using a three phase Hoymiles system running with grid limiting on its own, (i can export to an extend because of old conventional eskom meters) and connected on one of the hoymiles phases is a 10kVA quattro on AC-in that only supports backup loads on AC-out. Questions on this system: 1. When connecting a meter to the three phase supply, i gather i would be able to see all data as below: AC loads box shows all three phases and power consumed from the hoymiles system. Critical loads shows that connected to the quattro 2. The Hoymiles system will switch off in the event of a power failure?, or will the phase on which the quattro is connected stay on as the quattro gives a "grid" from the battery? 3. Should a single phase meter be connected to the quattro phase for ESS? 4. Is it advisable to add DC coupled PV to the quattro to sustain those loads and prevent battery deadlock? Could the DC coupled pv replace 1 of the hoymiles phases?

Hi I have a question regarding PV inverter compatibility with victron inverters. Can you use any grid tie inverter on the AC-in side of a victron or only the listed ones (fronius, ABB, solar edge?) My understanding is if you use "non-listed" pv inverters it wont/cannot be controlled via the GX device, but can still be installed and will be like two separate systems with separate control and monitoring? My thinking is Three phase grid-tie system for daylight use and single phase victron with DC coupled PV to sustain backup loads.

Not sure, but i have seen a three phase conlog meter operate without any issues with two of its phases connected to grid-tie inverters, grid limiting is activated so it does not push back, but it does not trip either.

Thanks will do, Its a rural installation, directly connected to Eskom. (3 phase, turning meters) On the ESS documentation it mentions phase compensation where the inverter balances the phases to use minimum grid power. I assume this cannot be done in SA, as i understand it feeds back power on one phase to compensate for the other?

Good to know, thanks. It would make commissioning much easier i would imagine? As far as I know the quattros do require the ziehl relay?