AgentMulders

Hi
I had the Fox-ESS 6kW hybrid inverter with 2x 2.6kW batteries and 6 x 545w panels in November last year. What a life-changing event.
We had Crown Technologies supply and instal the unit in Johannesburg and they were superb! Professional and the most thorough of everyone I met with.
The appeal of the unit was the fact that it is a complete sealed unit and as such, all the different components work well together - there is absolutely no indication of when we move from grid to solar / battery. The system is a high voltage solution which means that you connect the batteries in series and not parallel, like most systems. That reduces the heat that is generated when the inverter changes the stored power from DC to AC current and hence there is no need for a noisy fan - it just has a heat sync. At the moment with 2 batteries in the unit, my voltage is 110V and when I upgrade to 4 batteries (10.4kWh) my voltage will go to 220V which is the same as the AC voltage. This means that the power lost in the change from DC to AC will be drastically reduced. It also means that the system will last longer than other lower voltage systems. The installed cost of the system in Nov 2022, incl 2 x CBI Wi-Fi isolator switches for the geyser and pool pump, came to R152k.
I spent a lot of time reducing my household consumption before installing my system, so had reduced my daily household consumption from 40kWh/d to about 15kWh/d. I'm now consuming about 4kWh/day. To reduce the daily power, I've installed a 300l solar geyser, changed all lights to LED, changed to a gas hob and have installed a wood stove heater in our living area. It is important to first reduce your daily consumption before moving to solar - as it will cut your installation costs down considerably. I also moved from a postpaid City Power smart meter to a prepaid meter (save approx. R700 pm straight off).
With the way Eskom is going it is essential to have a solution in place!

Update after 4+ months of operation is that the system works like an appliance, haven't had to change anything or even draw power from the grid. I've switched the grid on about once a month just so it registers that I still exist but at most it uses 1kwh when I do.
The inverter stays cool, the batteries stay cool, and I'm able to spend a night cooking and baking and running my slow cooker and air conditioner and still have about 50% battery remaining in the morning when the sun comes out. I was worried a few times when it was raining and cloudy but that just meant the batteries charged up slower with the latest charge up to 99% being 4pm. I haven't even updated my geyser schedule on the CBI astute, it runs 10am to 2pm every day no matter the weather.
I'm really impressed with how it's changed our lives, with my house becoming the unofficial Pretoria office for my loadshedding-afflicted colleagues that don't want to drive to the Joburg office 😂
 
Only negatives are that the app isn't as simple or fully featured as the Sunsynk, but honestly once I had it set up and trusted that everything is working as planned, I don't even open the app or the web monitoring console anymore.

@Smiles@CasaV I had a great experience, and we've been off grid since about a week after the install, quite literally, our Eskom mains switch is flipped off.
 
I started with the solar panels, looking specifically for glass-glass bifacial panels and I only found one supplier in South Africa that had content online (articles and YouTube videos). So I contacted M Solar Power in Cape Town and asked for a Gauteng installer recommendation. They referred me to Crown Technologies in Joburg.
 
Crown then came out for a consult and quote, and mapped the panels in 3D space and did a simulation of the actual equipment using a tool called Helioscope - this is something that really set them apart from the other companies I spoke to, it resonated with me as a software engineer. They also made suggestions about how to reduce electrical loads and control them with some home automation.
 
My final installed setup is a FoxESS K series 10.5kw single phase inverter (IP65 but mounted in the garage under roof), 12x JA Solar Deep Blue 3.0 P-Type Bifacial glass-glass panels for a total of 6.5kw over 2 MPPT channels (2 out of 4), FoxESS EnergyCube 4.1 with one BMS master and 3 slaves for a total of 16kwh battery storage. I had the installers leave space for another 3 battery modules and another 12 solar panels. In preparation I also painted my IBR roof white to maximize the bifacial ability of the panels, and it had a nice secondary effect of cooling the house down by 2 to 4 degrees in this crazy heat wave.
 
So far it's been great, I can treat it like an appliance, it just works. I was watching the power graphs obsessively in the beginning but now I trust it to just work with zero intervention. We are fully electric: swapped our gas geyser for 150lt electric geyser with 2kw ceramic element and CBI astute DB switch running 10am to 2pm daily, installed a Bosch induction cook top that works better than a gas hob, and we can run the 18 000 BTU inverter aircon throughout the night set to 21 degrees. So far we've only gone down to 48% once (last night when we were cooking and baking till late and running the aircon all night) and usually only run down to 65%. We're fully charged by 9am on a sunny day and on a cloudy day last month I kept the geyser off till 12 to let the batteries recharge.
 
As for the experience of the product, I can't recommend it enough, I'm sure my friends looking for solar advice are already sick of me telling them to get a FoxESS system. And I had a great experience with Crown Technologies. One of my 12 panels was damaged in transit so they had to wait for a replacement to arrive. In that time there was also a product recall on a 3rd party AC connector that had actually failed on my system as well. The same day that I sent them photos of my connector they already got notice of the recall and were awaiting shipment of replacement parts. Once the panel and the connector arrived they came out and installed the final panel and swapped out the faulty connector. As part of the service, Crown was also monitoring my system remotely to check for anomalies or alarms. They, along with M Solar Power have sent feedback to FoxESS South Africa and there was a software update specifically for SA clients to change how the system handles the return of power after loadshedding (for clients that are drawing power from the grid).
 
Having now seen the product and experienced living with it, I believe high voltage is the way of the future for residential installs. It is after all technology trickled down from utility and commercial installations. Apparently what they've been seeing through their monitoring is as much as 15% more energy availability and also lower temperatures. The highest temperature recorded on my battery is about 2 to 3 degrees above ambient (39.9 at 14:20 on Monday 3 October). It's also much easier to add another module, I can fully DIY it without risking my life with high ampere DC cables as thick as my thumb. It's a simple process of switching off, lifting the top module off, placing the new module, attaching an earth cable, and putting the top module back on.
 
Some stats:
peak PV power: 6.7kw (Crown explained this as edge-of-cloud effect that happens on cloudy days) on normal days 6.48kw peak
peak power usage: 6.57kw (I was running my Makita cut-off saw at the same time as the geyser being on, it has a huge start-up current spike)
monthly usage before solar: 600 - 800kwh
monthly usage after solar: 0kwh from Eskom, the only number that counts
 
Some thoughts:
It's silent - no fans anywhere!
It's tidy - no exposed wires to touch
It's IP65 - can be installed outside in the rain if it has to be
I paid a bit more for something brand new and super cool and I'm happy with it, should also give me 5 to 10 years more service life than a generic solar install
I initially only wanted 12kwh batteries but at the last minute upped it to 16kwh and I'm glad I did. Might add another module in 6 months, depending on how things run with the rainy season.

@Smiles@CasaV I had a great experience, and we've been off grid since about a week after the install, quite literally, our Eskom mains switch is flipped off.
 
I started with the solar panels, looking specifically for glass-glass bifacial panels and I only found one supplier in South Africa that had content online (articles and YouTube videos). So I contacted M Solar Power in Cape Town and asked for a Gauteng installer recommendation. They referred me to Crown Technologies in Joburg.
 
Crown then came out for a consult and quote, and mapped the panels in 3D space and did a simulation of the actual equipment using a tool called Helioscope - this is something that really set them apart from the other companies I spoke to, it resonated with me as a software engineer. They also made suggestions about how to reduce electrical loads and control them with some home automation.
 
My final installed setup is a FoxESS K series 10.5kw single phase inverter (IP65 but mounted in the garage under roof), 12x JA Solar Deep Blue 3.0 P-Type Bifacial glass-glass panels for a total of 6.5kw over 2 MPPT channels (2 out of 4), FoxESS EnergyCube 4.1 with one BMS master and 3 slaves for a total of 16kwh battery storage. I had the installers leave space for another 3 battery modules and another 12 solar panels. In preparation I also painted my IBR roof white to maximize the bifacial ability of the panels, and it had a nice secondary effect of cooling the house down by 2 to 4 degrees in this crazy heat wave.
 
So far it's been great, I can treat it like an appliance, it just works. I was watching the power graphs obsessively in the beginning but now I trust it to just work with zero intervention. We are fully electric: swapped our gas geyser for 150lt electric geyser with 2kw ceramic element and CBI astute DB switch running 10am to 2pm daily, installed a Bosch induction cook top that works better than a gas hob, and we can run the 18 000 BTU inverter aircon throughout the night set to 21 degrees. So far we've only gone down to 48% once (last night when we were cooking and baking till late and running the aircon all night) and usually only run down to 65%. We're fully charged by 9am on a sunny day and on a cloudy day last month I kept the geyser off till 12 to let the batteries recharge.
 
As for the experience of the product, I can't recommend it enough, I'm sure my friends looking for solar advice are already sick of me telling them to get a FoxESS system. And I had a great experience with Crown Technologies. One of my 12 panels was damaged in transit so they had to wait for a replacement to arrive. In that time there was also a product recall on a 3rd party AC connector that had actually failed on my system as well. The same day that I sent them photos of my connector they already got notice of the recall and were awaiting shipment of replacement parts. Once the panel and the connector arrived they came out and installed the final panel and swapped out the faulty connector. As part of the service, Crown was also monitoring my system remotely to check for anomalies or alarms. They, along with M Solar Power have sent feedback to FoxESS South Africa and there was a software update specifically for SA clients to change how the system handles the return of power after loadshedding (for clients that are drawing power from the grid).
 
Having now seen the product and experienced living with it, I believe high voltage is the way of the future for residential installs. It is after all technology trickled down from utility and commercial installations. Apparently what they've been seeing through their monitoring is as much as 15% more energy availability and also lower temperatures. The highest temperature recorded on my battery is about 2 to 3 degrees above ambient (39.9 at 14:20 on Monday 3 October). It's also much easier to add another module, I can fully DIY it without risking my life with high ampere DC cables as thick as my thumb. It's a simple process of switching off, lifting the top module off, placing the new module, attaching an earth cable, and putting the top module back on.
 
Some stats:
peak PV power: 6.7kw (Crown explained this as edge-of-cloud effect that happens on cloudy days) on normal days 6.48kw peak
peak power usage: 6.57kw (I was running my Makita cut-off saw at the same time as the geyser being on, it has a huge start-up current spike)
monthly usage before solar: 600 - 800kwh
monthly usage after solar: 0kwh from Eskom, the only number that counts
 
Some thoughts:
It's silent - no fans anywhere!
It's tidy - no exposed wires to touch
It's IP65 - can be installed outside in the rain if it has to be
I paid a bit more for something brand new and super cool and I'm happy with it, should also give me 5 to 10 years more service life than a generic solar install
I initially only wanted 12kwh batteries but at the last minute upped it to 16kwh and I'm glad I did. Might add another module in 6 months, depending on how things run with the rainy season.

Update after 4+ months of operation is that the system works like an appliance, haven't had to change anything or even draw power from the grid. I've switched the grid on about once a month just so it registers that I still exist but at most it uses 1kwh when I do.
The inverter stays cool, the batteries stay cool, and I'm able to spend a night cooking and baking and running my slow cooker and air conditioner and still have about 50% battery remaining in the morning when the sun comes out. I was worried a few times when it was raining and cloudy but that just meant the batteries charged up slower with the latest charge up to 99% being 4pm. I haven't even updated my geyser schedule on the CBI astute, it runs 10am to 2pm every day no matter the weather.
I'm really impressed with how it's changed our lives, with my house becoming the unofficial Pretoria office for my loadshedding-afflicted colleagues that don't want to drive to the Joburg office 😂
 
Only negatives are that the app isn't as simple or fully featured as the Sunsynk, but honestly once I had it set up and trusted that everything is working as planned, I don't even open the app or the web monitoring console anymore.

Update after 4+ months of operation is that the system works like an appliance, haven't had to change anything or even draw power from the grid. I've switched the grid on about once a month just so it registers that I still exist but at most it uses 1kwh when I do.
The inverter stays cool, the batteries stay cool, and I'm able to spend a night cooking and baking and running my slow cooker and air conditioner and still have about 50% battery remaining in the morning when the sun comes out. I was worried a few times when it was raining and cloudy but that just meant the batteries charged up slower with the latest charge up to 99% being 4pm. I haven't even updated my geyser schedule on the CBI astute, it runs 10am to 2pm every day no matter the weather.
I'm really impressed with how it's changed our lives, with my house becoming the unofficial Pretoria office for my loadshedding-afflicted colleagues that don't want to drive to the Joburg office 😂
 
Only negatives are that the app isn't as simple or fully featured as the Sunsynk, but honestly once I had it set up and trusted that everything is working as planned, I don't even open the app or the web monitoring console anymore.

I know it's months later but I figured it's worth replying here since it's the only FoxESS thread I could find. The battery and inverter system are a high voltage DC setup, so you can't swap batteries out for a Pylontech 48v for instance. They are standard rack mount type batteries though. Fox is owned by a large battery manufacturer that does OEM work, so it's more likely that their tech is in other products that we already know.
I'm installing a Fox 10.5kw hybrid inverter and high voltage battery pack in about a week (in Pretoria), I was considering the FoxBox which is the 6kw all in one mentioned in the original post but I'm trying to get as close to off grid as possible so I wanted more power and more panels. The 10.5 inverter has 4x MPPT with a max of 15kw.

Update after 4+ months of operation is that the system works like an appliance, haven't had to change anything or even draw power from the grid. I've switched the grid on about once a month just so it registers that I still exist but at most it uses 1kwh when I do.
The inverter stays cool, the batteries stay cool, and I'm able to spend a night cooking and baking and running my slow cooker and air conditioner and still have about 50% battery remaining in the morning when the sun comes out. I was worried a few times when it was raining and cloudy but that just meant the batteries charged up slower with the latest charge up to 99% being 4pm. I haven't even updated my geyser schedule on the CBI astute, it runs 10am to 2pm every day no matter the weather.
I'm really impressed with how it's changed our lives, with my house becoming the unofficial Pretoria office for my loadshedding-afflicted colleagues that don't want to drive to the Joburg office 😂
 
Only negatives are that the app isn't as simple or fully featured as the Sunsynk, but honestly once I had it set up and trusted that everything is working as planned, I don't even open the app or the web monitoring console anymore.

@Smiles@CasaV I had a great experience, and we've been off grid since about a week after the install, quite literally, our Eskom mains switch is flipped off.
 
I started with the solar panels, looking specifically for glass-glass bifacial panels and I only found one supplier in South Africa that had content online (articles and YouTube videos). So I contacted M Solar Power in Cape Town and asked for a Gauteng installer recommendation. They referred me to Crown Technologies in Joburg.
 
Crown then came out for a consult and quote, and mapped the panels in 3D space and did a simulation of the actual equipment using a tool called Helioscope - this is something that really set them apart from the other companies I spoke to, it resonated with me as a software engineer. They also made suggestions about how to reduce electrical loads and control them with some home automation.
 
My final installed setup is a FoxESS K series 10.5kw single phase inverter (IP65 but mounted in the garage under roof), 12x JA Solar Deep Blue 3.0 P-Type Bifacial glass-glass panels for a total of 6.5kw over 2 MPPT channels (2 out of 4), FoxESS EnergyCube 4.1 with one BMS master and 3 slaves for a total of 16kwh battery storage. I had the installers leave space for another 3 battery modules and another 12 solar panels. In preparation I also painted my IBR roof white to maximize the bifacial ability of the panels, and it had a nice secondary effect of cooling the house down by 2 to 4 degrees in this crazy heat wave.
 
So far it's been great, I can treat it like an appliance, it just works. I was watching the power graphs obsessively in the beginning but now I trust it to just work with zero intervention. We are fully electric: swapped our gas geyser for 150lt electric geyser with 2kw ceramic element and CBI astute DB switch running 10am to 2pm daily, installed a Bosch induction cook top that works better than a gas hob, and we can run the 18 000 BTU inverter aircon throughout the night set to 21 degrees. So far we've only gone down to 48% once (last night when we were cooking and baking till late and running the aircon all night) and usually only run down to 65%. We're fully charged by 9am on a sunny day and on a cloudy day last month I kept the geyser off till 12 to let the batteries recharge.
 
As for the experience of the product, I can't recommend it enough, I'm sure my friends looking for solar advice are already sick of me telling them to get a FoxESS system. And I had a great experience with Crown Technologies. One of my 12 panels was damaged in transit so they had to wait for a replacement to arrive. In that time there was also a product recall on a 3rd party AC connector that had actually failed on my system as well. The same day that I sent them photos of my connector they already got notice of the recall and were awaiting shipment of replacement parts. Once the panel and the connector arrived they came out and installed the final panel and swapped out the faulty connector. As part of the service, Crown was also monitoring my system remotely to check for anomalies or alarms. They, along with M Solar Power have sent feedback to FoxESS South Africa and there was a software update specifically for SA clients to change how the system handles the return of power after loadshedding (for clients that are drawing power from the grid).
 
Having now seen the product and experienced living with it, I believe high voltage is the way of the future for residential installs. It is after all technology trickled down from utility and commercial installations. Apparently what they've been seeing through their monitoring is as much as 15% more energy availability and also lower temperatures. The highest temperature recorded on my battery is about 2 to 3 degrees above ambient (39.9 at 14:20 on Monday 3 October). It's also much easier to add another module, I can fully DIY it without risking my life with high ampere DC cables as thick as my thumb. It's a simple process of switching off, lifting the top module off, placing the new module, attaching an earth cable, and putting the top module back on.
 
Some stats:
peak PV power: 6.7kw (Crown explained this as edge-of-cloud effect that happens on cloudy days) on normal days 6.48kw peak
peak power usage: 6.57kw (I was running my Makita cut-off saw at the same time as the geyser being on, it has a huge start-up current spike)
monthly usage before solar: 600 - 800kwh
monthly usage after solar: 0kwh from Eskom, the only number that counts
 
Some thoughts:
It's silent - no fans anywhere!
It's tidy - no exposed wires to touch
It's IP65 - can be installed outside in the rain if it has to be
I paid a bit more for something brand new and super cool and I'm happy with it, should also give me 5 to 10 years more service life than a generic solar install
I initially only wanted 12kwh batteries but at the last minute upped it to 16kwh and I'm glad I did. Might add another module in 6 months, depending on how things run with the rainy season.

@Smiles@CasaV I had a great experience, and we've been off grid since about a week after the install, quite literally, our Eskom mains switch is flipped off.
 
I started with the solar panels, looking specifically for glass-glass bifacial panels and I only found one supplier in South Africa that had content online (articles and YouTube videos). So I contacted M Solar Power in Cape Town and asked for a Gauteng installer recommendation. They referred me to Crown Technologies in Joburg.
 
Crown then came out for a consult and quote, and mapped the panels in 3D space and did a simulation of the actual equipment using a tool called Helioscope - this is something that really set them apart from the other companies I spoke to, it resonated with me as a software engineer. They also made suggestions about how to reduce electrical loads and control them with some home automation.
 
My final installed setup is a FoxESS K series 10.5kw single phase inverter (IP65 but mounted in the garage under roof), 12x JA Solar Deep Blue 3.0 P-Type Bifacial glass-glass panels for a total of 6.5kw over 2 MPPT channels (2 out of 4), FoxESS EnergyCube 4.1 with one BMS master and 3 slaves for a total of 16kwh battery storage. I had the installers leave space for another 3 battery modules and another 12 solar panels. In preparation I also painted my IBR roof white to maximize the bifacial ability of the panels, and it had a nice secondary effect of cooling the house down by 2 to 4 degrees in this crazy heat wave.
 
So far it's been great, I can treat it like an appliance, it just works. I was watching the power graphs obsessively in the beginning but now I trust it to just work with zero intervention. We are fully electric: swapped our gas geyser for 150lt electric geyser with 2kw ceramic element and CBI astute DB switch running 10am to 2pm daily, installed a Bosch induction cook top that works better than a gas hob, and we can run the 18 000 BTU inverter aircon throughout the night set to 21 degrees. So far we've only gone down to 48% once (last night when we were cooking and baking till late and running the aircon all night) and usually only run down to 65%. We're fully charged by 9am on a sunny day and on a cloudy day last month I kept the geyser off till 12 to let the batteries recharge.
 
As for the experience of the product, I can't recommend it enough, I'm sure my friends looking for solar advice are already sick of me telling them to get a FoxESS system. And I had a great experience with Crown Technologies. One of my 12 panels was damaged in transit so they had to wait for a replacement to arrive. In that time there was also a product recall on a 3rd party AC connector that had actually failed on my system as well. The same day that I sent them photos of my connector they already got notice of the recall and were awaiting shipment of replacement parts. Once the panel and the connector arrived they came out and installed the final panel and swapped out the faulty connector. As part of the service, Crown was also monitoring my system remotely to check for anomalies or alarms. They, along with M Solar Power have sent feedback to FoxESS South Africa and there was a software update specifically for SA clients to change how the system handles the return of power after loadshedding (for clients that are drawing power from the grid).
 
Having now seen the product and experienced living with it, I believe high voltage is the way of the future for residential installs. It is after all technology trickled down from utility and commercial installations. Apparently what they've been seeing through their monitoring is as much as 15% more energy availability and also lower temperatures. The highest temperature recorded on my battery is about 2 to 3 degrees above ambient (39.9 at 14:20 on Monday 3 October). It's also much easier to add another module, I can fully DIY it without risking my life with high ampere DC cables as thick as my thumb. It's a simple process of switching off, lifting the top module off, placing the new module, attaching an earth cable, and putting the top module back on.
 
Some stats:
peak PV power: 6.7kw (Crown explained this as edge-of-cloud effect that happens on cloudy days) on normal days 6.48kw peak
peak power usage: 6.57kw (I was running my Makita cut-off saw at the same time as the geyser being on, it has a huge start-up current spike)
monthly usage before solar: 600 - 800kwh
monthly usage after solar: 0kwh from Eskom, the only number that counts
 
Some thoughts:
It's silent - no fans anywhere!
It's tidy - no exposed wires to touch
It's IP65 - can be installed outside in the rain if it has to be
I paid a bit more for something brand new and super cool and I'm happy with it, should also give me 5 to 10 years more service life than a generic solar install
I initially only wanted 12kwh batteries but at the last minute upped it to 16kwh and I'm glad I did. Might add another module in 6 months, depending on how things run with the rainy season.

I was in Durbs on a totally seperate mission & carrying out an inspection to assist some guys & I saw this at one of the clients homes. What a piece of art this is. The first time I have seen one in the flesh!!! Extremely sleek & it just works almost plug & play but I guess not cheap at all, none the less very very effective. I alway thought it had a plastic moulded case. This material used is powder coated white steel. Much the same as the FreedomWon Battery casing material. But the battery is very very compact indeed.
 

Hi @AgentMuldersyes we do have experience in the high voltage battery installations. We mainly consult these for commercial clients. However, the Sun Grow High Voltage solution is available & yes it's modular & can be scaled up by adding another module or brick. After consultation from the main supplier, not a single unit has been sold. Looks very good though on paper. I can only talk about the Commercial high voltage solution. It is an extremely elegant solution. Much thinner cable diameter & less amount of copper used & so less amps required. High Volts, less amps for a given wattage. 

I'm on Eskom direct in Pretoria and waiting patiently to see what they announce. Our batteries are fully charged by 10am so there's a fair amount of PV power going to waste right now

I'm on Eskom direct in Pretoria and waiting patiently to see what they announce. Our batteries are fully charged by 10am so there's a fair amount of PV power going to waste right now

Most of these commercial companies including Makro use Grid tied systems. Makro have all of their car parks connected to Solar PV & they have Solar Edge PV inverters that are Grid tied. So there is no backup power available if the Grid goes down. Interesting enough the PV inverters are mostly IP65 & live always outside near to the Array & there is good reason for this. The PV DC wiring is a plenty. However, the AC cable is bi-directional & only one AC cable of the required thickness is required. Makes sense to save the costs of all the string DC cables to keep them as short as possible. Typically the PV array DC voltage is 1000v string limits. So long strings are possible. 
In our small world of Residential Solar PV projects we think of the 48V system as a way to power our homes. I can tell that the Original poster here is asking where do they store this power & also how is possible to store so much power into 48V batteries. 
The answer is not 48V... Commercial level power that is above 30kW 3phase energy requires the High Voltage battery DC power. Voltronics has a solution with 2 inverters namely a 20kW 3 phase & a 30kW 3 phase big trolley inverter. The smaller 20kW machine cannot be paralleled & scaled where as the 30kW machine can be paralleled up to 4 times to provide 120kW. The DC voltage range is 366V up to 550V on the battery bus. We install these for any power requirement that is larger than 30kW & needs to be grown in the future. Our battery of choice for this solution is the Pylontech H1 Cube. It has 74ah Pylontech 48V modules that connects in series to build.up the high voltage. This then pairs into a HV BMS controller then into the inverter with a card to pair the Comms with the inverter. The solution is magic!!!
This is lethal voltage but the fundamental pros of such system is less amperage for the given voltage. Power = Volts X Amps. The advantages of the HV Battery is that the cable size for these large power requirements are like 25mm cable because the amps at max discharge for the 30kW inverter is 17A DC. A similar sized 48V battery would require at least 70mm or above type of cable. 
Pylontech, FreedomWon, Solar MD & even Livoltek manufacturer these HV batteries for commercial use. The other day I actually saw a Sun grow residential inverter with this setup also at a supplier. The 48V battery looks to use too much copper. It's days will be numbered in the not so distant future.