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Riaad Abdulla asked

MultiPlus-II 48/3000/35-32 (ACOut2 switchable) Configuration/Questions

Hello,

I would like to find out the answers to these questions - would greatly appreciate any assistance:

- Can I connect many high load items to AC OUT 2? Like 2 water heaters, 1 oven and a few aircons... is there a limit? I understand that these will be switched off when there grid fails which I am fine with but I want to install solar and hopefully use some of that power to take care of some of the load when it's active

- Once I get solar and there is a grid failure, will the solar continue to charge the batteries to keep the critical loads on AC OUT 1 up? Or will solar stop working and I will depend fully on battery which won't be charged until grid is back up?

- I see my battery is showing in a constant charging state even when it's at 100%... is this normal or am I overcharging it? Which I hear is bad


Thanks!!

My site on VRM is called "RIAAD ABDULLA"

Inverter = MultiPlus-II 48/3000/35-32 (ACOut2 switchable)

Battery = Pylontech US3000 + US2000

Multiplus-II
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marekp avatar image
marekp answered ·

@Riaad Abdulla 

- Can I connect many high load items to AC OUT 2? Like 2 water heaters, 1 oven and a few aircons... is there a limit? I understand that these will be switched off when there grid fails which I am fine with but I want to install solar and hopefully use some of that power to take care of some of the load when it's active

There is a total AC-in current limit at 32A for MP-II/3000.

- Once I get solar and there is a grid failure, will the solar continue to charge the batteries to keep the critical loads on AC OUT 1 up? Or will solar stop working and I will depend fully on battery which won't be charged until grid is back up?

If you connect your grid-tie inverter on the AC-in side of MP-II, grid-tie inverter will turn off when grid is gone.

If you connect your grid-tie inverter on the AC-out side of MP-II there will be no disruption when there is a load higher than PV production. Grid-tie PV inverter connected this way cannot be bigger than MP-II. (for 3000VA MP-II it can be no bigger than 3000kW)

There is no power limit on MPPT chargers connected on the DC side.

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Riaad Abdulla avatar image
Riaad Abdulla answered ·

Thanks @MarekP - I don't fully understand but I just found a youtube video which seems to explain the solution I want. This should allow me to lose grid power and continue on batteries (along with solar still charging the batteries)... is this what you were explaining? I have ordered the MPPT already (250/70)

Video - See from 7:18

system-diagram.jpg


As for AC OUT 2 on the Multiplus unit... hopefully 32A is enough for all my needs. I will need to chat to my electrician.


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Matthias Lange - DE avatar image Matthias Lange - DE ♦ commented ·

It is an limit of the input relays (transfer switch) AC OUT 1 + 2 can't exceed 32A.
1637078156719.png

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marekp avatar image marekp commented ·

@Riaad Abdulla

This picture shows MPPT charger connected to DC side. (your 250/70 for example)

There is also available grid-tie type inverter that connects to the AC side. (Fronius for example). It can be connected in two different ways I described in my first answer.

screen-shot-2021-11-16-at-52446-pm.png


The 32A limit is for TOTAL AC draw from grid (AC1 plus AC2).

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