question

tyrone-thomas avatar image
tyrone-thomas asked

Busbars or Lynx Distribution with Mulitple DC Consumers and Sources

I am planning a system with

2x Victron Energy Quattro 24/5000/120-100/100 Inverter with Charger - 120V

3x 100/50 Charge Controller w/ Bluetooth

3(to start and growing)x 24V 100Ah LiFePO4 Batteries

1x DC-DC 23-12 inverter

According to "Wiring Unlimited - Rev 06 page39

(https://www.victronenergy.com/upload/documents/Wiring-Unlimited-EN.pdf)
" If the system has only one battery bank you should connect the battery bank in the middle of the busbars. But in case of several parallel battery banks or smart batteries, they should also be distributed evenly along the busbars. "

I am considering the Lynx distribution system. In the Lynx Distributor System Design

https://www.victronenergy.com/media/pg/Lynx_Distributor/en/system-design.html#UUID-b83b9114-46c7-485b-541b-dfc258a29489

Shows an ideal configuration would be lynx distributors on on either side of a lynx smart BMS in between. This would seem to be in conflict with the diagram recommended in the wiring guide.


Should I use busbars instead of the Lynx Distribution system?

MPPT ControllersBMSmultiple inverterswiring diagrambusbar
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3 Answers
Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

In my opinion it looks cleaner with the Lynx system, but you also can use busbars, it's up to you.

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seb71 avatar image
seb71 answered ·

For that kind of power, make a 48V system (not 24V).

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tyrone-thomas avatar image tyrone-thomas commented ·

let me preface with the fact i am a newbie. But i thought given my panels are 48V and 10Amp VOC, I can pair 2 and charge a 24V batt more reliably in low sun and at closer to max charge current. I also worry about the price differential on 48V equipment vs 24V. as it is i picked 3 smaller contrllers in part because of fault tolerance but mostly because the price of 3 was less than the price of a corespondingly sized single unit.

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tyrone-thomas avatar image
tyrone-thomas answered ·

Thanks for your answers @Seb71 and @Matthias Lange - DE. Are you both saying the Victron guidance " But in case of several parallel battery banks or smart batteries, they should also be distributed evenly along the busbars" is incorrect and doesnt matter? Cleaner install is a consideration but power loss, inefficiencies, dc oscillation are my chief concerns.

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Matthias Lange - DE avatar image Matthias Lange - DE ♦ commented ·
In my opinion your planned system is not so big that you will have problems with power loss or inefficiency

The Lynx system has very big busbars and is rated for 1000A. Even at full peak power of both Quattro you will "only" have around 800A.

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shaneyake avatar image shaneyake commented ·

I agree with Matthias.


Also if you went 48V which would also be my recommendation for a system this size your current would be halved.

From what I can tell this looks like an RV system, so it will really be up to how you are able to layout your panels. Can you put 2 or more panels in series you can easily have a 48v system.


Also do you have a generator? If not a Multiplus-II might be a cheaper option.

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tyrone-thomas avatar image tyrone-thomas shaneyake commented ·

I dont have or currently plan on a generator. Yes, this is to retrofit an RV but i am actually running ~70ft 8awg runs for the panels so i can keep the rv in the shade while having flexibility to place panels optimally.


Can you explain a bit more about the Multiplus-II vs the Quattro? I have a some esoteric goals. Maybe you can tell me if this is possible: switchable config with 2 inverters to generate 2 phase power to push excess power to Grid tie interconnect or run a high power circuit for things like a welder.


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