Fintray wrote: ↑Mon Feb 03, 2025 8:08 pm
+1 for Victron, I have 3 running in parallel on single phase, 3 battery banks outputs linked together and each bank running JK BMS.
how easy was it to setup?
multiple inverters would be good, means I can stick with 48v with less amps going to each one
are the shunts for battery power in/out external to the inverters or do they not are and just by the bms / pack voltage? - I'm wondering how the 3 inverters going to a single battery bank share battery bank info?
which ones are you running? any backup when grid is down option?
Stinsy wrote: ↑Mon Feb 03, 2025 1:35 pm
I see. That makes sense!
I believe LEAF cells are nominally 3.75V with a max charging Voltage of 4.2V. at 14s that multiplies to 52.5V and 58.8V. This is fine for low power levels eg 3.6kW, but once you get above 5kW the current levels start to get out of control. Therefore nowadays higher pack voltages are used.
Here is a typical 3-phase hybrid inverter: https://www.itstechnologies.shop/produc ... -inverter/
It is designed to work with battery packs between 120-800V. Therefore the original 96s 360V arrangement would work very well.
I'm a bit scared of high voltage DC... I'm a bit clumsy... had enough 240v shocks in my life, but high voltage dc your muscles tense up and you can't leave go.... probably best left to someone who's a bit more careful then I am :-o
Don’t be casual with 48V either. You’ll be just as dead/disfigured just by different means!
12x 340W JA Solar panels (4.08kWp)
3x 380W JA Solar panels (1.14kWp)
5x 2.4kWh Pylontech batteries (12kWh)
LuxPower inverter/charger
(Artist formally known as ******, well it should be obvious enough to those for whom such things are important.)
HML wrote: ↑Mon Feb 03, 2025 1:18 pm
If you don't mind spending money the SMA Sunny Islands will cope with all of that. You can set them up as a 3 phase system, parallel up to 3 of them in a simple system, more if you complicate the system somewhat. They can be setup in various modes - stand alone with generator backup, grid tied with export, etc.
I have 2 Sunny Island 8s running in parallel with approximately 1500Ah of 48V LiFEPO4 batteries - 12kW continuous, 16kW for 30 minutes, 18kW for 5 minutes. 3 phase isn't needed for any reasonable household.
Loads include 2 induction hobs (notional 7.6kW each), 2 ASHPs an A2A mini split and a 7kW car charger.
oh I remember reading peoples posts about Sunny Islands years ago on the navitron forum...
do you have separate battery banks for each or one battery bank with both connected?
re: 3 phase, heat calcs say we need almost 30kw of heating - going to insulate the hell out of the place but the best I could possibly do (best windows, 300mmloft, 300mm underfloor, 300mm exterior wall insulation) only brought it down to 20kwh ish
add in one car charger for my gf right now, I assume a second one at some point for me, then in the future kids too (no kids yet!)
I intend to go crazy with the solar pv and add as much as possible
plus I've worked with 3 phase since I was a little kid helping my dad, more than happy to work with it etc.
How many sqm of floor space? The place must be vast if you can’t get the heat demand below 20kW with decent insulation. A typical 100sqm 3bed semi with the insulation you describe would be below 4kW.
12x 340W JA Solar panels (4.08kWp)
3x 380W JA Solar panels (1.14kWp)
5x 2.4kWh Pylontech batteries (12kWh)
LuxPower inverter/charger
(Artist formally known as ******, well it should be obvious enough to those for whom such things are important.)
HML wrote: ↑Mon Feb 03, 2025 1:18 pm
If you don't mind spending money the SMA Sunny Islands will cope with all of that. You can set them up as a 3 phase system, parallel up to 3 of them in a simple system, more if you complicate the system somewhat. They can be setup in various modes - stand alone with generator backup, grid tied with export, etc.
I have 2 Sunny Island 8s running in parallel with approximately 1500Ah of 48V LiFEPO4 batteries - 12kW continuous, 16kW for 30 minutes, 18kW for 5 minutes. 3 phase isn't needed for any reasonable household.
Loads include 2 induction hobs (notional 7.6kW each), 2 ASHPs an A2A mini split and a 7kW car charger.
oh I remember reading peoples posts about Sunny Islands years ago on the navitron forum...
do you have separate battery banks for each or one battery bank with both connected?
re: 3 phase, heat calcs say we need almost 30kw of heating - going to insulate the hell out of the place but the best I could possibly do (best windows, 300mmloft, 300mm underfloor, 300mm exterior wall insulation) only brought it down to 20kwh ish
add in one car charger for my gf right now, I assume a second one at some point for me, then in the future kids too (no kids yet!)
I intend to go crazy with the solar pv and add as much as possible
plus I've worked with 3 phase since I was a little kid helping my dad, more than happy to work with it etc.
How many sqm of floor space? The place must be vast if you can’t get the heat demand below 20kW with decent insulation. A typical 100sqm 3bed semi with the insulation you describe would be below 4kW.
HML wrote: ↑Mon Feb 03, 2025 1:18 pm
If you don't mind spending money the SMA Sunny Islands will cope with all of that. You can set them up as a 3 phase system, parallel up to 3 of them in a simple system, more if you complicate the system somewhat. They can be setup in various modes - stand alone with generator backup, grid tied with export, etc.
I have 2 Sunny Island 8s running in parallel with approximately 1500Ah of 48V LiFEPO4 batteries - 12kW continuous, 16kW for 30 minutes, 18kW for 5 minutes. 3 phase isn't needed for any reasonable household.
Loads include 2 induction hobs (notional 7.6kW each), 2 ASHPs an A2A mini split and a 7kW car charger.
oh I remember reading peoples posts about Sunny Islands years ago on the navitron forum...
do you have separate battery banks for each or one battery bank with both connected?
When you parallel Sunny Islands they act as one inverter, so they have one input and one output in effect. My battery consists of 5 batteries connected in parallel and they become one battery from the POV of the inverter.
Yes, if you're going to create an EV charging station 3 phase is a good idea, but not a typical domestic set up.
Fintray wrote: ↑Mon Feb 03, 2025 8:08 pm
+1 for Victron, I have 3 running in parallel on single phase, 3 battery banks outputs linked together and each bank running JK BMS.
how easy was it to setup?
multiple inverters would be good, means I can stick with 48v with less amps going to each one
are the shunts for battery power in/out external to the inverters or do they not are and just by the bms / pack voltage? - I'm wondering how the 3 inverters going to a single battery bank share battery bank info?
which ones are you running? any backup when grid is down option?
It was pretty straightforward to setup, just follow the Victron guidance carefully.
The Smartshunt connects between the battery negative and the system negative and measures power in/out. The 3 inverters are setup as a master and 2 slaves and talk to each other via VE bus connections, I have these connected to a Cerbo GX and this also connects to the JK BMS (which are also interlinked) and gets the battery information. It can show battery state, highest/lowest cell voltages and temperatures.
The ones I have are Multiplus II 48/5000 (continuous 12kW in the event of a power failure or an additional 12kW on top of your normal mains capacity if required) and they give me total home backup, they switch over very quickly (<20milliseconds).
Forgot to say that if you do go 3 phase these inverters can be linked to give up to 75kW with 1200A charging capacity.
Fintray wrote: ↑Tue Feb 04, 2025 11:12 amIt was pretty straightforward to setup, just follow the Victron guidance carefully.
The Smartshunt connects between the battery negative and the system negative and measures power in/out. The 3 inverters are setup as a master and 2 slaves and talk to each other via VE bus connections, I have these connected to a Cerbo GX and this also connects to the JK BMS (which are also interlinked) and gets the battery information. It can show battery state, highest/lowest cell voltages and temperatures.
The ones I have are Multiplus II 48/5000 (continuous 12kW in the event of a power failure or an additional 12kW on top of your normal mains capacity if required) and they give me total home backup, they switch over very quickly (<20milliseconds).
Forgot to say that if you do go 3 phase these inverters can be linked to give up to 75kW with 1200A charging capacity.
that sounds perfect
you have full battery -ve going through the shunt? are you worried about how many amps you're pulling through that cable? any photos?
Fintray wrote: ↑Tue Feb 04, 2025 11:12 amIt was pretty straightforward to setup, just follow the Victron guidance carefully.
The Smartshunt connects between the battery negative and the system negative and measures power in/out. The 3 inverters are setup as a master and 2 slaves and talk to each other via VE bus connections, I have these connected to a Cerbo GX and this also connects to the JK BMS (which are also interlinked) and gets the battery information. It can show battery state, highest/lowest cell voltages and temperatures.
The ones I have are Multiplus II 48/5000 (continuous 12kW in the event of a power failure or an additional 12kW on top of your normal mains capacity if required) and they give me total home backup, they switch over very quickly (<20milliseconds).
Forgot to say that if you do go 3 phase these inverters can be linked to give up to 75kW with 1200A charging capacity.
that sounds perfect
you have full battery -ve going through the shunt? are you worried about how many amps you're pulling through that cable? any photos?
If you look at page 37 section 4.8 in the Wirng Unlimited document I linked to, it is all about Victron Shunts from smallish ~(500Amp) to largeish (6000Amp) all being 50mV and I believe monitored by the Victron BMV.
I am wanting to get a multiplus II 48/5000/70 + bateries+ more PV only I need to build a garage first and that requires PP as I am in a conservation area.
Fintray wrote: ↑Tue Feb 04, 2025 11:12 amIt was pretty straightforward to setup, just follow the Victron guidance carefully.
The Smartshunt connects between the battery negative and the system negative and measures power in/out. The 3 inverters are setup as a master and 2 slaves and talk to each other via VE bus connections, I have these connected to a Cerbo GX and this also connects to the JK BMS (which are also interlinked) and gets the battery information. It can show battery state, highest/lowest cell voltages and temperatures.
The ones I have are Multiplus II 48/5000 (continuous 12kW in the event of a power failure or an additional 12kW on top of your normal mains capacity if required) and they give me total home backup, they switch over very quickly (<20milliseconds).
Forgot to say that if you do go 3 phase these inverters can be linked to give up to 75kW with 1200A charging capacity.
that sounds perfect
you have full battery -ve going through the shunt? are you worried about how many amps you're pulling through that cable? any photos?
I have the 500A Smartshunt and it takes the full current through it (regularly charging at night with 11kW 200+A), the busbars (5x25mm) only get slightly warm.
