question

Wayne avatar image
Wayne asked

48V Nissan Leaf Lithium Battery Pack 14S with 30A BMS

THE BATTERY

Capacity (when new): 3.5KWH

Fully charged voltage: 58.8V

I have 8x 250w solar panels 37.2 voc

4x 100/50 victron SCC

whats the best way to build this system?

48v battery
2 |3000

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1 Answer
Vance Mitchell avatar image
Vance Mitchell answered ·

Just looking at the manuals, the 100/50 doesn’t list 48v use. 2 x 100/20 controllers would handle that array.

Try the MPPT calculator to work out the best controller for your panels.

The Nissan Leaf modules normally don’t get replaced until they are down to 60-70% capacity. That means in reality that battery will have around 2.1-2.5 kWh capacity. 2kW of solar seems excessive for that size battery, what are you planning on using the system for?


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Wayne avatar image Wayne commented ·

Thanks Vance

trying to design a system that would keep power and lights on when the grid goes down.

It would not be grid tied only off grid

interesting about the battery was hopping to get more than 2.5 kWh capacity.

I have never used 48v before only 12v systems


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Vance Mitchell avatar image Vance Mitchell Wayne commented ·

I haven’t personally owned any of the leaf batteries, so I could be wrong. I read that Nissan won’t replace batteries until they reach a certain point. If they came from a wrecked vehicle they may be better.

I personally don’t trust second hand batteries as I feel they have been replaced for a reason.

If you already have the 100/50 controllers I would consider going 24v. There is lots of 24v lighting options and if you want 240v, 24v is fine for a 3kva inverter.

24-12 reducers are also fairly common if you need 12v.

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Wayne avatar image Wayne Vance Mitchell commented ·

Thanks Vance great info

I ordered 2 Victron SmartSolar MPPT 100/20 (48V) with Bluetooth Solar Charge Controllers

should I connect 4 panels on one and 4 on the other?

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Vance Mitchell avatar image Vance Mitchell Wayne commented ·

Yes 4 panels on each.

You will need to put 2 panels in series to achieve a high enough voltage to charge that battery.
paralleling 2 strings into each controller sounds like your best option.

Without knowing all the details of your panels and how they are mounted, I can’t give a definite answer.

If you are using that battery you will also have to find out how to interface the BMS to your system to protect the cells from overcharging/over voltage.

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Wayne avatar image Wayne Vance Mitchell commented ·

Great advice Vance

The 8 panels are mounted on a flat tin roof

connected 2 panels each with a Y joiner

awaiting the the cable 4mm

37.2 voc each panel

I also have 2 300w panels 38 voc

The battery's bms is 30amps

Does the 2 Victron SmartSolar MPPT 100/20 (48V) charge controllers have a function to turn down the voltage?

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Vance Mitchell avatar image Vance Mitchell Wayne commented ·

The MPPT controllers will need to be set up to suit the battery.

I believe there is also a way to use the ve.direct port to shutdown the controllers if the BMS signals any type of error.


Edit:

VE.Direct non inverting remote on-off cable (ASS030550310) is what is required, check with your dealer for more information

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Wayne avatar image Wayne Vance Mitchell commented ·

Thanks Vance

will enquire into VE.Direct non inverting remote on-off cable

Will I also have to buy the

Victron Energy VE.Bus BMS?

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Vance Mitchell avatar image Vance Mitchell Wayne commented ·

That BMS is for the victron batteries.

You should be able to connect the remote on-off cable to your BMS that comes with the batteries, as long as it has a allow to charge signal.

You will need to check the instructions that come with the BMS on the battery pack to ensure it is set up correctly. I would wait until you have that prior to purchasing the remote cable.

1 Like 1 ·
Wayne avatar image Wayne Vance Mitchell commented ·

Thanks Vance

Yes I should have waited but I brought one last night on ebay $35

The seller sent the battery this morning.

Courier said it would take about a week to arrive.

The seller is


eBay - ev-import



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