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Victon System questions

DP425

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Joined
May 4, 2024
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8
Location
Lansing, MI
I've got a few questions I could use a hand on.
My System as it stands, is a Victron Quattro-II 2x120 and three SOK 206AH batteries. Not yet installed, but these components on hand.

Questions are as follows:
1- I want to use the Lynx connection system; I obviously do not need, nor can I use the Lynx BMS. However, I'm a bit unclear on if the Shunt has a value when not using the BMS or a GX monitoring device (I do not currently plan on running one). It sounds like one of the two are required to be able to pull data from it.

2- Does the Quatro-II have built in bluetooth for the app, or is a separate device required?

3- The three SOK batteries are to reside in factory battery trays in my toy hauler. These three will fill my tray space. This area is weather protected, but not conditioned; I could probably convert it over to conditioned, but I bought the batteries with the heaters to avoid this. I decided to use the factory tray space, as I really don't want to use up the space in my "basement", and I'm just not comfortable sleeping directly over batteries (so I won't mount them under my bed). Anyway, if I decide three batteries isn't enough, am I asking for trouble mounting another battery or two, or three, inside a conditioned space (the "basement"), while the other three are not in a conditioned space (temp differential).

4- The Quattro-II has 70a of charging. The SOK batteries each have a recommended charge current of 40a, and a max of 70. So at the recommended current, I'm coming up 50a short, but could reasonably use another 100a. Can I add an auxiliary charger, such as the Smart IP43 Charger, 50a model? I'm assuming so, but I thought it better to ask.

I'll have to come back later to start the discussion on Solar (where I feel woefully under informed). That's a next year project.
 
I would highly recommend one shunt - if you use the bmv712 you can bolt it directly on the Lynx. I just helped by brother in law install a system in his 5th wheel - we used one Lynx (with fuses added- see YouTube) for the batteries to connect. Then we had the shunt (negative) and a on/off switch (positive) they were bolted directly on the “distributor” Lynx - we used a few short pieces of 1/4” x 1” tin plated copper bar (from on-line metals.com) as bus bars to connect to the power Lynx.

The Cerbo-S and touch is really nice and gives great information about your system.

600ah is a lot of power - (I have 544ah) it is plenty unless it is cloudy for 2 days or need the air conditioner (then the generator needed ran anyway). I have 1500w of solar.

You can add another charger - but see how it goes first…
 
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I would highly recommend one shunt - if you use the bmv712 you can bolt it directly on the Lynx. I just helped by brother in law install a system in his 5th wheel - we used one Lynx (with fuses added- see YouTube) for the batteries to connect. Then we had the shunt (negative) and a on/off switch (positive) they were bolted directly on the “distributor” Lynx - we used a few short pieces of 1/4” x 1” tin plated copper bar (from on-line metals.com) as bus bars to connect to the power Lynx.
Yeah, I've seen that. I was REALLY hoping the lynx shunt would be of use without having the BMS or GX device. I really don't understand why they don't have the ability to read it built into the Quattro-II. I would think it could provide some pretty useful information to the unit. Anyway, I just like how clean it looks with lynx.!
 
I agree the Lynx is nice and clean!

You will need a way to control the Quattro.

The control I am talking about is adjusting the 120v amp input (on 50a - 30a -35a (my generator)-15a or 10a (lowest for my Multiplus). Also switch between on/off/inverter only/charger only.

There are three different ways.
1. MCU panel. Expensive for what it does - save the money and invest it in #3.
2. VE.Bus smart dongle- cheapest. Can make the adjustments on your Bluetooth phone.
3. GX device I.e. Cerbo. This is the best Cerbo-S is a little cheaper. You will probably want a Touch50 (display). It is expensive, but it does a lot of other stuff too.

It summarizes your system into a single point, so you and anyone else in the rig can easily understand what is happening. Also, the DVCC is really good feature.

VRM is really nice - this puts the cerbo’s data on the internet so you can check up on it. A bit ago my rig was in the shop for a bit (we full-time), it was really nice that I could look up and make sure the rig had power. (So our residential fridge stayed running) - nice peace of mind.

Good Luck
 
4- The Quattro-II has 70a of charging. The SOK batteries each have a recommended charge current of 40a, and a max of 70. So at the recommended current, I'm coming up 50a short, but could reasonably use another 100a. Can I add an auxiliary charger, such as the Smart IP43 Charger, 50a model? I'm assuming so, but I thought it better to ask.
That recommended charge current is the max recommendation. You can go below that threshold no problem at all.
 
What do you want your battery system to do? Figure this out first and then we can help make sure you don't waste money.
 
What do you want your battery system to do? Figure this out first and then we can help make sure you don't waste money.
Run one AC unit overnight, plus RV refrigerator, CPAP, phone chargers.

Where I’m at in MI, the AC won’t have to be on a cooling cycle the whole night, for the most part. Even if it did, I’ll have the generator set for auto start.

Then during the day, both AC’s may need to run, so I’d be running the generator anyway. 5500w, I’d be left with at least 2500 for charging and incidental needs. Seems I would be able to run nearly 170a of charging and not exceed the generator’s capacity. Plus with the Quattro’s ability to reduce charging to accommodate load limitations on L1, I would still have room for incidental demand. Not that I need so much charging capacity with 3-4 batteries.

So here’s another question someone might know. In the Cerbo GX, can the Quattro be setup to turn off the generator when the batteries are charged? What about predictive/scheduled charging? Say, I want my batteries full charged at 9pm. Can it be setup to know how charged the batteries are, and predict when it needs to start the generator to have a full charge by 9pm?
 
Run one AC unit overnight, plus RV refrigerator, CPAP, phone chargers.

Where I’m at in MI, the AC won’t have to be on a cooling cycle the whole night, for the most part. Even if it did, I’ll have the generator set for auto start.

Then during the day, both AC’s may need to run, so I’d be running the generator anyway. 5500w, I’d be left with at least 2500 for charging and incidental needs. Seems I would be able to run nearly 170a of charging and not exceed the generator’s capacity. Plus with the Quattro’s ability to reduce charging to accommodate load limitations on L1, I would still have room for incidental demand. Not that I need so much charging capacity with 3-4 batteries.

So here’s another question someone might know. In the Cerbo GX, can the Quattro be setup to turn off the generator when the batteries are charged? What about predictive/scheduled charging? Say, I want my batteries full charged at 9pm. Can it be setup to know how charged the batteries are, and predict when it needs to start the generator to have a full charge by 9pm?
I haven't used it but you can enable node red on a Cerbo/Venus os device, gives you the control you are looking for I believe

 
The Quattro doesn’t turn on/off the generator- that’s the Cerbo’s job. The Cerbo will know the battery SOC (state of charge) from the shunt (Smartshunt, bmv712, or Lynx shunt),

With the standard programming of the generator start/stop it has low state of charge times (start at 25% SOC) and time based - run for 60 min.(whatever you set it for). There are more options available and LOTS with node red but I haven’t used either so I can’t comment much.
 

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