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Defining seperate charging currents for MPPT & MP2

Hi there;

I have just added a Plyontech US2000C (total of 3 now) and I want to charge them with 75A.

I have a MP2 GX-Version that can charge with 35A, a Victron Smartsolar 250/60 MPPT attached to 4KW of solar and a solar inverter parallel to the MP with 2KW of solar attached.

At the moment the charge current in the MPPT is still set to 50A, which was ok for the two US2000C, but now I'd like to charge the three US2000C with 75A....BUT, I don't want the MPPT to charge with more than 50A since it already gets pretty hot at times.

As far as I understand, it should be possible that 50A come from the MPPT and the rest (25A) will come from the MP if enough solar energie is present.

At the moment the system (MPPT & MP) only charges with a max. of 50A.

Funny enough that if there's not enough solar energy, the MPPT & MP charger work together to achieve the 50A but won't exceed that current.

So how can I set the system to charge at 75A???

aussiedreamland asked
klim8skeptic commented ·

2 Answers

[Answer] charging details for a Hankook XV110 110AH leisure battery

Hi All,

I googled this extensively and found no answer, so I contacted the manufacturer and spoke to some suppliers.

Fortunately, all the answers came back the same, so my confidence in their accuracy is
high:

So, when setting up your B2B for the Hankook XV110 Battery:

Bulk charge = 14.6-14.8v

Absorption = bulk charge

Float charge would be 13.4v - 13.8v

Hope this helps someone else out there.

Regards

BB

bigbloke asked
soop1979 commented ·

1 Answer

Mismatched Battery Voltages; MPPT 75/15 vs Storage

BattVoltage_AtBatts.jpgBattVoltage_ExCtrller.PNGPhantomLoadOutput_ExCtrller.PNGMPPT 75/15, VE.Direct Smart, 1 x 250W 24v Panel, 3 x 12v Gel Batteries

Although I've been running this set up for many years, I've only recently reverted to cross-checking outputs with a volt meter, as I've trusted the VE output figures. I have two questions for anyone interested in humouring me:

1. Why don't the voltages at VE Batt and Battery terminals match? Surely they're the same thing. Lately (possibly always!) I see a ~2.0v difference, with the VE 'output', and Bluetooth readout, being higher than the 'battery' voltage. Is this due to drop-off created by the attached inverter? I ask because I seem to be reaching 'Float' level rather quickly, and when the system goes nigh-nighs my VE voltage readout is dropping to sub-12v. Is this due to a 'tired' battery (sorry, a third question)?

2. Like many others, I have never attached a 'Load' to my system. Nevertheless, the VE readout often shows a 'phantom load'. Why is this? I haven't been able to find out why in any of the Victron literature.

Thanking You in Advance, SS


stonysolar asked
stonysolar answered ·

2 Answers

Multi rs solar online settings access

Hi!

I’m using multi rs solar 48/6000 with pylontech batteries and a cerbo gx all connected with ve can.

I want to know if there is a way to access to my multi rs settings with wifi, (online) n’es cause sometimes I want to charge my batteries with grid.

Without changing from « optimised » to « maintain charged batteries » I can’t charge batteries from grid. So I want to be able to change it from anywhere, but I can’t without being at 5m range in Bluetooth.

One more question, is there a way to charge an ESS configuration in multi rs to be able to feed info grid?

gabius asked
gabius answered ·

2 Answers

MultiPlus Settings for LiFePO4 2x 200ah Ampere Time Battery Bank

Hello!

I have just purchased all the parts for a Victron branded solar setup on my motorhome.

Im using two Ampere Time 200ah LiFePO4 batteries in paralell for my bank. What should I set the absorption, float and bulk to when I set up my MultiPlus 3000VA 12v inverter?

I've read a few similar posts and they all sound very forign to me. This is my first solar setup.

If you dont mind... please explain to me like im 5.

outerspacemannn asked
earthadam commented ·

2 Answers

Confusion on SmartShunt values

Hey all, I’ve recently installed my first Victron system on an RV. Components in question here are the MultiPlus II 2x120 24V, SmartShunt, and Cerbo GX. The way I’ve set everything up, I thought should be correct, but I’m getting some odd behavior. Because it’s an RV, there is a 12V DC system in addition to the MultiPlus outputs. I have 2 batteries wired to the battery side of the shunt, and system side of the shunt goes to the MultiPlus, DC system, and all the Victron components; that is to say, absolutely no load bypasses the shunt, it should see everything. Because of the DC loads, I have the Cerbo set to “has DC system”.

When the MultiPlus is off, it appears that the shunt registers DC loads as charging the battery, not drawing from it. The little dots on the overview graphic appear moving towards the battery, and the amperage readout on the battery shows positive while on the “DC system” amps show negative.


When the generator is running and the MultiPlus is charging the battery, it seems to mostly behave normally, but the DC system amp readout will bounce between positive and negative.

I’m not sure if this is the root cause or not, but the State of Charge readout is entirely inaccurate, too. I’ve just done my first trip with this system. I had the batteries fully charged before leaving, sync’d the shunt to 100%, and left for the trip. My first night, batteries completely died, to the point nothing would power on even briefly, the 24V battery bank was registering under 10V, yet the shunt still read 82% SoC. Throughout the rest of the trip, I had low batteries at various times, setting off the alarm on the MultiPlus, etc. And the shunt would read <20V while still showing 100% SoC. It also appears this is impacting charging, as the batteries were under 20V and yet the MultiPlus was showing the charging state as “float” within 10 minutes of starting the generator.

Needless to say, I’m rather confused. Any tips would be greatly appreciated!


EDIT: Pictures of installation for wiring purposed added below, thanks @Matthias Lange - DE

[image]

[image]

knissone asked
knissone commented ·

2 Answers

Blue smart ip22 charger 12/30(3)
  • Hi I’m a noob so be gentle. I’m building a camper. Can I use the Blue smart ip22 charger 12/30(3) to charge my agm living battery and my starter battery at the same time to top up and when on hook up to support the living battery . Also the van might sit in winter for weeks can it keep both topped up.
  • Thanks in advance

clump71 asked
clump71 commented ·

1 Answer

Connecting Victron blue smart charger to 1 or 2 batteries

Iam using Victron Blue smart charger 12v and Cyrix-ct. The charger can charge 3 batteries. I have connected as on the picture (just without 85 start assist). Shall I also connect the charger (+) direct to the starter battery? Will I then get fully information of both batteries via bluetooth?

[image]

larsdenmark asked
Alistair Warburton answered ·

1 Answer

Lifep04 idle charge

Hi

Newbie question .

I have a 100ah 12v lithium battery to run a fridge in the back of my car. It is used infrequently and taken out of the car when not in use. It can charge in the car with a DC-DC charger and I have a 15A Victron Blue smart charger at home.

I’ve read that lithium batteries, including LFP, last longer if stored and about 50% charge.

Does the charger/app have a profile to keep the battery at, say, 60-70% while not being used, then change the profile to full charge a day or two before being used?

Is that something that is practical or desirable?

Thanks

Steve

sedge asked
Alistair Warburton answered ·

1 Answer

Charger and SmartShunt and Inverter current going the wrong way and miss representing SOC

I have a need to keep 120V maximum 50W of load powered in the case of a power outage and to be able to remotely monitor the SOC of the batteries. The configuration runs off of 2 x AGM 12V 100Ah batteries connected in series with a SmartShunt 500A, a Phoenix Inverter 24V 250VA 120V, a Blue Smart IP65 24V 8A charger all connected to a Raspberry Pi acting as a CerboGX.

[image]

Both the SmartShunt and the Inverter are connected to the Pi via the VE.direct to USB cable and are visible via the VictronConnect Application and VRM.

Since the Charger only has Bluetooth capability, we can not manage it remotely, but only locally which is fine. But non of the devices talk to each other over a virtual Victron wireless network like a SmartShunt can with an MPPT for example.

[image]

The problems that I am seeing are the following:

  1. When looking at the inverter, it only show 0% load. That value never changes.
  2. When looking at the SOC on the SmartShunt for the batteries, they are continuously reporting as discharging even though the Charger is permanently connected and charging the batteries.
  3. In the VRM portal, the current flow is going from the batteries to the Inverter and not from the Inverter to the batteries as I would have expected it since the inverter is supposed to keep the batteries topped off when AC power is usually available.

Is this configuration simply not possible because each element do not have a way of communicating to each other?

Or is the Charger not to be connected to the negative terminal of the battery bank but needs to go through the system Negative of the SmartShunt? (I have tried that but to no difference).

[image]

The setup is available at https://vrm.victronenergy.com/installation/216745/share/97d4ba88

Thank you for any help anyone can provide.

Thierry Douet asked
ludo edited ·

9 Answers

2009 Skylla-TG 24-100 G Universal - Upgrade??

Hi - I have a 2009 Skylla-TG 24-100 G Universal. As far as I can tell this unit does not have the ability to set the Boost voltage, Float voltage, or Absorption time. Is there any way to upgrade/update it, or do I have to buy the new version??

capdave asked
Rob Fijn answered ·

2 Answers

BlueSolar MPPT - Batterylife algorithm thresholds

Hello,

We're using BlueSolar MPPT 75/15 for solar street light application. The LED source is connected directly to the load output of the charger.

I know, that the Batterylife algorithm is changing the load disconnect/connect voltage thresholds, according to how the battery was charged. But what are the actual thresholds for the 12V system, what is the absolute low/high disconnect/connect voltage and what is the daily increment, if the battery was not charged again?

Knowing this would help a lot configuring the light, taking into account the voltage drop in the cables, and also solving some issues with cases where light doesn't switch ON at all.

Many thanks and kind regards,

Peter

peromb asked
vonny232 commented ·

4 Answers

SmartSolar MPPT Load Output vs Absorbtion/Float voltages

Hi,

I have a SmartSolar MPPT 100/20 with 400w of panels and a 24v flooded lead battery bank.

I have the Bulk -> Absorption threshold set to 28.8v and Absorption -> Float threshold set to 27.6v as per general recommendation.

Separately to this, I have the Load Output "ON" threshold set to 28v and the "OFF" Threshold set to 24.7v.

However, the load output triggers prematurely when Bulk voltage > 28v, even though the battery has not completed its charge cycle at that stage.

Conversely, I have seen recently a few occurrences of the opposite. Namely, the battery is already fully charged, so the charge controller enters float state. Whilst in float state, the battery level does not rise to 28v and therefore the load output is not triggered.

This essentially means I am losing energy as the MPPT controller is only harvesting a minimal amount of energy to trickle charge the battery, but the load output is incapable of triggering due to the trickle voltage.

Surely other people have experienced this problem? Does anyone have any advice here please?


vonny232 asked
vonny232 edited ·

1 Answer

Blue Smart Charger 12/30 Storage voltage.

The charger is set to High which should give 14.7v Absorption, 13.8v Float & 13.2v Storage. The first 2 are spot on but when in Storage the voltage is 13.35-13.4. This is confirmed by my SmartShunt and a standalone multimeter at the battery. (160AH AGM). Is this a fault or should I just change the voltage in the advanced settings?

dave-w asked
wkirby answered ·

1 Answer

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