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murphy avatar image
murphy asked

Easysolar2 3 phase system

Hi
First don't hit new user hard fecause of silly questions.:)
I am engineer(power electronics/motor controls hw/sw), so any generic terms are familiar.
I am in process of installing solar system for home. Setup:
2 phase 230V
EasySolar II
2x multiplus II.
MPPT 250/100-Tr VECan
ELERIX EX-S5 battterys
2 banks of solar panels with around 180V max. matched to max power of coresponding MPPT


What i done so far:
1) set up 3 phase system(after googling day for "zzz" pasword)
2) configured voltages fir inverter, charger MPPT

Whats confusing, multiple diferent config interfaces. VE direct -usb for inverters, BT for MPPT
internet for GT
What i am bit stuck:
1) how to set charger to keep say 20% of charge minimum in battery, is it only as simple as voltage/capacity from battery manual? Or should i set to disconnect AC_IN if battery voltage is above 20% voltage?

2) battery offers BMS com over CAN, but, MPPT uses CAN. its it ok to connect BMS to same bus? My automotive experience says CAN is CAN, standard protocol and everything should be able to talk it if they are electrically compadible. Want to use it for more acurate voltage measurment.

3)seen mention of modbus, is GX inside easysolar able to play master and read temperatures/voltages throu TCP modbus?




Multiplus-IIEasySolar All-in-One
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3 Answers
Duivert NL avatar image
Duivert NL answered ·

hi have you taken a look at the manuals? officialy 3 phase setup is not possible with a easysolar and 2 multiplus 2 see:

https://www.victronenergy.com/live/ve.bus:manual_parallel_and_three_phase_systems

your battery is a non tested (non supported?) for victron see

https://www.victronenergy.com/live/battery_compatibility:start


its not possible with the easy solar GX to connect the battery with can to the same can of the mppt

so if both need to be connected to the GX you will need a cerbo or another mppt


steps of configuration of your system is:

follow al steps in the parallel and three phase systems manual

1) setup 3- phase with ve bus system configurator

2) Ve configure for easysolr/multiplusses

3) remot console in GX device to make last settings


is suggest you have contact with a local victron dealer to get support, you could damage your equipment easy if you dont understand the system

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murphy avatar image murphy commented ·

Tnx for answer.
Yes i have looked manuals
3 phase is supported, easysolar II contains Multiplus II, its an 3 in one. and acording to manual you must use multiplus II to create 3F system . Thats not and issue, it allready works.
Instalation is done according to manual.

BMS is not suported by victron but its compadible, battery manufacturer have instructions for it. but if its one or other(BMS/MPPT) it has no use for me.

I dont have local dealer, one i used to order equipment wont give support.
Damage is unlikelly, even if i do something real stupid like set wrong battery voltages BMS will trip.

Open question is still, how system understands when to use AC in and when to use power from PV. A.k. i wanna charge batterys to only 20% from grid. Have many grid outages and yould like to keep just some juice left always in batterys. I
I see 3 options todo it:
1) Multiplus II by setting max charge voltage to 20% (51.6V according to battery manual).
2) Multiplus II by setting disconnect AC input when battery level is above 20%
3) by GX and enabling GX to change charge current in multiplus II

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Duivert NL avatar image Duivert NL murphy commented ·
i didnt say it wont work, just not supported :)


you can configure it as ESS and setup max discharge of 20%,


then pv and grid will support your loads and when needed battery,


and when grid is lost PV and the 20% battery will be used
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JohnC avatar image
JohnC answered ·

Hi @murphy

These aren't silly questions. Silly people don't ask them..

For a broad summary of the protocols.. https://www.victronenergy.com/upload/documents/Technical-Information-Data-communication-with-Victron-Energy-products_EN.pdf

CAN might be CAN, but you may find a need to adjust the speed in the GX to be compatible. And the cable pinouts mightn't match either. Eg. Victron supply 'Type A' and 'Type B' cables for Pylontech alone. Your battery maker should give you guidance here. This is important if you want to use downstream logic to make decisions, and of course for reporting.

You may find your batteries will mimic another, like we hear reports of strange battery brands being recognized as Pylontech. So that may make it easier.

I'd expect the mppt in the Easy would also have a VE.Direct port, but I haven't checked. Use that to avoid the Can link the battery needs.

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Duivert NL avatar image Duivert NL commented ·
he also has a mppt with VE can next to the easysolar build in mppt
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murphy avatar image murphy Duivert NL commented ·

yes that will make upto 5.8KW , separate one is 4kw.

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murphy avatar image murphy commented ·

yes it has VE direct, i could use it for MPPT( probably can exchange CAN model for VEdirect model).
CAN pinout i have , even how to make cable. Have 2 batterys but i assume i using one for monitoring is good ( both are coming to same point in busbar so thay should have cluse enugh charge level).
I can estimate charge level based on voltage but i am pretty sure that that reading from multiplus is not acurate.
1717054539451.png


I was asking for modbus bucause i could make hub for all batterys(i do PCB/software designe for living). Batterys do have RS485 that seems to be modbus. Reason for it is to get any errors messages from any of batterys, not just one. But thats later and not priority atm.

ATM urgent thing is, how system understands when to use AC in and when to use power from PV? A.k. i wanna charge batterys to only 20% from grid. Have many grid outages and yould like to keep just some juice left always in batterys. I

I see 3 options todo it:

1) Multiplus II by setting max charge voltage to 20% (51.6V according to battery manual).
MPPT still charges batterys full.

2) Multiplus II by setting disconnect AC input when battery level is above 20%

3) by GX and enabling GX to change charge current in multiplus II, DVCC maybe?


with 2 Problem i see if solar is not enough to maintain load it would start cliking on and off.

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1717054539451.png (69.2 KiB)
Duivert NL avatar image Duivert NL murphy commented ·

ATM urgent thing is, how system understands when to use AC in and when to use power from PV? A.k. i wanna charge batterys to only 20% from grid. Have many grid outages and yould like to keep just some juice left always in batterys.

like i said in my previous answer ESS can do that!

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JohnC avatar image JohnC ♦ murphy commented ·
@murphy

There are a number of ways to do what you want with ACIN. Given the relay is onboard the Multi, it's fairly simple to code Assistants to switch it. The battery should provide a system SOC, but disable the onboard one.

A bit more difficult to switch on Lithium V, as it varies more with Load than SOC in all but the upper SOC range. But with Assistants you can programme in multiple factors, so you might be able to use it as well to serve extreme situations.

Look into DVCC too for system-wide data. And how the battery deals with it.

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murphy avatar image
murphy answered ·

Topic closed, Big big tnx for everyone helping.

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