Why should I rather install Two x Multiplus 2 (48/5000) than One x Quattro (48/10000)

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Lyndsay Cotton asked Feb 2, '21

Why should I rather install Two x Multiplus 2 (48/5000) than One x Quattro (48/10000)

Hello,

I would appreciate assistance in this as well. I am submitting a proposal today and I'm up against a Quattro vs my 2 x Multiplus 2 on a single phase.

ie: 1 x Quattro 48/10000 vs 2 x Multi 48/5000

If someone could urgently assist be with this I would be eternally grateful.

I see the first answer is roughly 10 months ago.

EDIT: Please note - this same question was asked 10 months ago and I posted there as well today. Due to my questions being more specific - I've created a new thread.

Question 1

Does the Quattro 48/10000 still NOT have anti islanding? The thread last year was answered no.

If Not, then to comply with our regulations - how do I deal with the anti islanding

Question 2

a.Are the Multi's not connected in parallel? OR

b. Must I split my DB in 2 - One Multi out (AC1/AC2) to one half (of the) DB, and other Multi out (AC1/AC2) to other half (of the) DB

As mentioned in the other thread - It seems as if the loads must be split

Question 3

a. How do I then deal with the batteries - Are they on the same bus as BOTH Multi's and the Battery?

Should one Multi be off or disconnected - that all the battery power then gets distributed to the remaining Multi.

b. There is a new UP5000 Pylontech out - Can I accept that this will also be compatible with Victron

Question 4

I read a while back that the Multis must be from the original "batch" / Firmware if used in the same install. What happens if one has to be replaced? A previous reply was that Victron would then replace both - Is this indeed the case?

I am using two SEPARATE arrays

first array goes to one x MPPT 250/85

second array goes to the second MPPT 250/85

My intention is, is to take each array to a separate combiner box BUT to then take each combiner box to ONE BUS - In this instance probably one to the first multi and the second to the other multi - being that they are connected in parrallel and on the same bus anyway. and, for enough space for the lugs (not too many on one bolt)

Multiplus-II MultiPlus Quattro Inverter Charger

2 |3000

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Answer 1 · 2021-02-02T10:48:57Z

alan answered · Feb 02, 2021 at 10:48 AM

1. The quattro has a disconnect relay, however it doesn't meet the latest standards in some countries. Check with your power authority on approved relays like the ziehl and install a separate anti-island relay upstream of the Quattro.

https://www.victronenergy.com.au/accessories/ziehl-voltage-frequency-sensitive-relay-ufr1001e

2. a) Yes

b) No, if wired correctly to a bus the current will be shared

3a) Not clear on this question, both multis have to share the same battery, be aware of battery sizing limitations. This will need to be increased for 2x5000w multis. https://www.victronenergy.com/live/battery_compatibility:pylontech_phantom

5x up5000 modules for either setup. (Surge rating falls short for 4)

4. This used to be the case, specifically between the older units with the smaller processors and the newer versions with the larger microprocessors. (Multi and Quattro)

I would intend to believe any of the multi-II's won't have this issue so a single replacement should be very possible

More info here https://www.victronenergy.com/live/ve.bus:manual_parallel_and_three_phase_systems

A few questions could have easily been answered here

https://www.victronenergy.com/upload/documents/Wiring-Unlimited-EN.pdf

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