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MPPT Daily Charge Cycle Control(s)

Hi,

This isn't my first post but it is my first question (in the form of a request). See the bottom of this post for the request specifics. I have seen questions regarding MPPT daily bulk charging but haven't seen either a usable answer or a specific request to provide tooling for the daily (re-bulk) charge cycling to be controlled by the user so... Here goes:

The desired action is for the MPPT to only start a bulk charge cycle when the battery being maintained drop below the re-bulk voltage. This could easily be introduced as a control where the user/owner can select daily re-bulk (and voltage based re-bulk) or voltage based re-bulk only. I may be one of only a few users that think this way but there really isn't any benefit for a battery to be bulk charged daily if the battery voltage doesn't drop below the re-bulk offset voltage. I recognize this controller has many functions but this method of charging is potentially harmful to batteries.

When charging is controlled solely by the MPPT, there may be cases where re-bulk charging every time the sun comes up and a new PV voltage is detected with the assumption the battery voltage doesn't matter at that point (I still don't understand but...) When the battery voltage is managed by an outside charger all night (in other words, the float voltage is kept up all night long by a separate charging device), please don't force my batteries to be subjected to a bulk charge voltage every single day. Let me paint a clearer picture:

I live in northwest Washington (USA) where the sun rarely comes out in the winter months and when it does, it isn't strong enough to maintain a decent PV charge but the sun can help keep the batteries from becoming completely exhausted if there is a power failure. Let's assume this system is on a boat so the PVs cannot be oriented toward the sun to capture the full power of what little sun there is (no tracking devices). When the sun comes up high enough to wake up the MPPTs, they start bulk charging until that bulk voltage is reached, then attempt absorption charging until the timer expires. This means at this time of year, at least 3 hours of unnecessary charging takes place (more on a cloudy day where the bulk voltage is more difficult to reach due to cloud cover) and the batteries are subjected to voltages they don't need (and really shouldn't see) which generates unnecessary heat and that heat boils off precious moisture that has to be replaced in a wasted maintenance routine.

I have a good example from Feb 02. Around 07:40, the PVs have just enough sun to start producing some sort of power:

[image]

It is probably worth mentioning the battery voltage was between 26.4 and 26.6 from the end of the MPPT charge cycle the day before until the start of this cycle:

[image]

The long cycle the day before was due to the shore power chargers being turned off for the day. Back to the 02/02/23: The charging mode is confirmed by the MPPTs:

[image]

Once the bulk voltage is satisfied, the absorption phase starts and last until about 10:20. The effect at the battery is a daily voltage that is not only unnecessary but will eventually dry out the batteries:

[image]

Charging a charged battery is simply undesirable and has nothing but bad effects on the batteries. It also takes all the affected charging equipment through an unnecessary heat cycle which will prematurely wear (or burn) out panels, MPPTs, and batteries.

Making adjustments to bulk and absorption settings will negatively affect charging when the batteries are not charged (i.e. not on shore power and at a safe float voltage all night) and not a good idea. I have considered turning off the PVs for the winter but that negates the safety factor in the case of a shore power outage.

Why would a new charge cycle start just because the PV voltage drops below a voltage that isn't configurable? Until the battery voltage drops below the re-bulk setting, I don't want my batteries hit with a bulk charge voltage every day.

There is a fairly easy answer (from my perspective) but it requires a little work, MPPT firmware, I imagine. Two solutions come to mind (both in firmware/software):

  1. Add a configurable toggle so the user/owner has the ability to turn off the "daily" charge cycling.
  2. Add a configurable charge cycle threshold for the PV voltage so it can be set to a voltage that the PV cannot reach (i.e. -0.1V) so the re-bulk setting takes precedence over the "daily" charge cycle.

rmorten asked
JohnC answered ·

1 Answer

Multiplus firmware for DVCC

Hi everyone, trying to sync voltages maybe I'm missing something?

Just have a couple of questions is DVCC okay to use with the 415 firmware on the multiplus as it requires 422 firmware I'm trying not to update it unless really have to (the multi is around 8 years old with new chip)

Or, is it best to either use the VE smart network instead it's mostly just to sync voltages

The system spec

Victron multiplus firmware 415

Two Victron smart solar mppts, 150/85 (10 series)which needs the latest Bluetooth dongle for the VE smart network to work and 100/50 (11 series) which has option already.

Victron Smartshunt

And CCGX

Lithium battery bank with heater inbuilt not Victron

Would it just be easier to just buy the BT dongle for the 150/85 mppt so to connect smartshunt/mppts to VE smart network or is there another way to sync voltages

Any ideas would be great thanks





salv asked
salv edited ·

7 Answers

Multiplus II shows wrong DC Voltage -> State „float“ prevents charging

Hi!
My system is an ESS with Multiplus II, Cerbo CX and two MPPT 250/70 and the smart shunt 500 in an 48V System LiFePO4 (no BMS).

The problem is, that due to any reason the DC Voltage shown / measured by the Multiplus is higher than the real DC-voltage. The shunt shows the correct voltage (checked with a voltmeter). The result of this mismatch is, that the Multiplus „thinks“ the batteries are full (state „Float“) and therefor the MPPTs are not charging .

When I switch off the Multiplus, the MPPTs are still not charging. But after rebooting the Cerbo both MPPTs are charging now to the proper voltage and SoC.

The system ran fine for more than half a year. Then one day this problem showed up. Updating to the latest firmware did not solve the problem. After increasing the Float Voltage from 54V to 54.3V it worked a while very good. But now the phenomenon started again.

[image]

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Are there any ideas how to solve this?

tomw asked
JohnC commented ·

2 Answers

fonctionnement du phoenix 12/1200

Bonjour à tous,

Cela fait 3 ns que j'ai installé un équipement Victon chez moi dans une maison autonome. J'ai 3 panneau de 300W relié à un MPPT 150/45, une batterie lithium 200AH 12,8V et un phoenix 12/1200. Tout est relié par du 25 mm2 et la distance entre le MPPT, batterie et transformateur est inférieur à 1m.

J'ai branché ma nouvelle batterie hier, j'avis avant une batterie plomb qui n'a pas tenue, et depuis j'ai l'impression que mon transformateur fait un bruit comme un frigo (désolé de ne pas trouver de mot plus adéquate). Cel m'inquiète un peu et j'ai peur d'avoir mal réglé les information via le victron Connect, j'ai pourtant suivi tout les éléments indiqué sur la notice.


Je vous remercie d'avance pour votre aide, je suis un peu perdu.


Antoine


antoineansquer asked
lonso answered ·

1 Answer

Mppt diamètre/distances

Bonjour,

Je dois rajouter un système de production solaire. Seulement, je ne trouve pas d'informations concernant le diamètre du câble par rapport à la longueur.

C'est un projet en études pour l'instant.

La distance entre la pose des panneaux solaires et les batteries est de 40m max.

Cest pour un site isolé en 48v

j'ai déjà installé à 20m des panneaux solaires sur mppt 150/85 avec câble 2x25mm² (panneaux->mppt 25mm² sur 20m, mppt-> batteries, 10mm² sur 2m).

Là, je voudrais mettre entre 3-4kwc.

Quel mppt prendre : 150v ou 250v?

Quel diamètre de câble entre panneaux solaires et mppt ?


Merci de votre réponse

Cordialement

vins asked
vins answered ·

2 Answers

Incorrect battery voltage reading on MPPT 150/45

The MPPT 150/45 charge controller is connected to a battery of 4 x 12V cells and is set to 48V. Although the multimeter indicates a Voltage of 55V across the battery, the MPPT is only indicating a Voltage of 18.89V across the battery. Does anybody have any advice?

johann-weinmann asked
klim8skeptic commented ·

0 Answers

Upgrading - swap MPPT 150/100 to 250/100 or get 2 additional 100/20 ?

Dear community,

I want to add four 590W panels to the roof. Before there were already 12 of them, 3s4p. Would you advice that I swap my MPPT150/100 for an MPPT250/100, to create a 4s4p, or instead get 2 additional MPPT100/20 with 2s1p each? All panels have the same orientation, but the shadow situation is complicated.

Pro buying two small MPPTs (instead of a Smart Solar MPPT250/100)
+ Having more MPPTs could be a benefit when there are difficult shadows
+ I understand that the maximum output of MPPT150/100 and MPPT250/100 are actually the same (5800W at 48V), so having three MPPTs would increase the theoretical maximum peak
+ Probably cheaper than selling the used MPPT150/100 and getting a new one

Against buying two small MPPTs (and for getting a MPPT250/100)
- adding one of the panel to each paralleled string would also help with the shadows, no big advantage of extra MPPTs
- having separate MPPTs means longer cables at lower voltages (2 more strings with 2 panels with Impp=17,25A open Voc=41,2V each) - thus, higher loss
- MPPTs might switch on a bit later, when only two panels in series

Any recommendations?
Thank you


tobyfw asked
seb71 edited ·

0 Answers

3xMP2 with ESS, connecting 2x Fronius on AC-out or 1x MPPT250/100 and one Fronius?

Hi Victron professionals and entheusiasts,

My system consists of:
MP2 5000/48
Smartshunt
Smartsolar 250/100
Cerbo
8 kWh LiFePO4 battery controlled by a CANbus communicating Batrium BMS.
12 + 5 x 365Wp AEG glass/glass panels on a SMA STP5.0
10x 365Wp AEG glass/glass panels, each connected at a Enphase IQ7+ on one phase.

Yesterday, I removed 10 pcs Enphase IQ7+ micro inverters from our roof and connected the panels over two separated strings of each 5 pcs 365Wp panels in parallel tot he Smartsolar 250/100.

With the ESS running I have 3 options now:

a) Connect all panels to the two Fronius Symo 4.0 inverters connected to the inverting AC-out of the MP2 for backup during grid failure OR

b) just add one Fronius at the AC-out and charge the batteries with the 2x5 panels connected at the Smartsollar MPPT 250/100?

c) keep the excisting SMA on grid side and use the Fronius to power my house when grid fails and accepting that the SMA will shut off during failure.

What would bet he best option?

Appreciate your opinion!


Paul asked
Paul edited ·

2 Answers

Any advantage for the SmartSolar MPPT 250/100 vs. MPPT RS 450/100

I plan to install 10 - 395W panels as a 5 Series x 2 Parallel configuration for a 48V system. From computing the MPPT charge controller, the Excel VE-MPPT has 2 options: #1. SmartSolar 250/100 and #2. the MPPT RS 450/100.

Base on the comparison below, I did not see much advantage of the MPPT RS 450/100 controller vs. the SmartSolar 250/100, except for being able to connect more panels in series to 450V. Did I miss something for the MPPT RS purpose? Why would one use the MPPTR RS?

Comparison:

Category #1 SmartSolar #2 MPPT RS notes
Price $950 $1295
Size Small Large
Battery 12, 14, 36, 48 48
Efficiency @48V .99 .96
Power @48V 5800 5760

Voc Min +5V 120V
#2 - 120V is way too high for shadowing days
Vmpp min +1V 80
Voc Max 250 450
Max PV voltage @ min Temp (-10C) 241.7 241.7 #2 has more head room
Min PV Voltage @ max Temp (70C) 157.8V 158.4V
Max current @MPP min Temp 88.7A 87.3A
#2 MPPT RS tracker current is 18A
Max current @MPP max Temp 71.8A 70.7A
PV Array 5S x 2P 5S x 1 - per Track (2) #2 has room to grow 3 more panels




james-nguyen asked
klim8skeptic commented ·

0 Answers

Mppt disappears from easysolar

[image]

I had successfully added a smart solar not to and easy solar 2. System via direct connect ports and it has been working very success fully over the last 4 days but this morning it’s disappeared from the system and UX display. I have tried connecting via usb and direct but nothing I have set mppt back to factory defaults but still not showing. I believe the two systems are linked via Bluetooth. I did add a display to the mppt last night. So I am at a loss. See pictures

[image]

jonnyhottub asked
jonnyhottub commented ·

1 Answer

MPPT 100/30, Battery Sense and BMV702

I have two AGM battery banks with existing BMV702 monitors (no temp sense installed). The banks are in the engine room of my boat.

I am installing an MPPT 100/30 on each bank and am a little concerned with voltage and temp compensation. The controllers will not likely be in the engine room, and will be about 10' away from the batteries.
Am I best to install a battery sense on each bank, or am I able to get the bluetooth dongle and temp cable for the BMV702's and use that somehow ?

or, am I overthinking things. The batteries never get over 35 C, that is only 0.12v of compensation needed which should not be a problem if I set the voltage parameters in the middle of the band for my batteries.

rob-mills asked
JohnC answered ·

1 Answer

75/15 MPPT and insufficient PV error with Firmware 1.59 issue

Hi folks,


I have a victron 75/15 MPPT hooked up to a 160w panel and 200ah AGM leisure battery, the system has been working flawlessly for years, battery replaced when needed but no issues at all, however, suddenly after upgrading to firmware version 1.59 I constantly get the insufficient PV error.


I have tried using a different panel, and different battery to no difference, having discussed this on Reddit in the victron community there,‘I’ve come across two others who also seen the same issue after upgrading to 1.59


Is there anything I can do about this, have victron issued any statements about faulty firmware, or is there a way for me to roll back to previous version which worked without any issue at all?

David Kennedy asked
stuart-browning answered ·

29 Answers

SmartSolar 100/20 drops to <10W intermittently for no obvious reasons

I've got 5 x SmartSolar 100/20's (Firmware v1.61) with 4x170W panels conected to each. These are charging a 48V Lifepo4 battery bank (2 lots of 4x12.8V). There is also a SmartShunt (Firmware v4.12) in series.This is connected to a Smart RS Solar inverter (Firmware v1.11). The whole system is managed by a CerboGX (3.00~15) to which is connected to all the units via ve.bus and ve.can. All five of the MPPTS and the SmartShunt are also in a Bluetooth ve Smart Network.

Each group of 4 panels has different shading issue however the problem I'm having doesn't correspond to any particular shading or times of day.

The issue I have is that randomly, one or more of the SmartSolar MPPTs will intermittently drop out. Input PV voltage is fine (in fact, goes up a little), input PV current drops to near zero and output current falls to near zero. It will stay there for a random period of time and then corrects itself.

While this is happening, the other MPPT's will continue to work correctly (although sometimes, more than one MPPT will start to do this at the same point but correct itself at different points!).

None of these issues corresponds with temperatures, battery output loads. battery state of charge or anything else I can see. The MPPTs remain in Bulk mode at all times. It does seem to quite often happen when the battery voltage is around 54V (but not always).

At one point, when this was happening, I tripped the breaker between the MPPT and the solar panels and then turned it back on and the MPPT started working again.

I'm open to suggestions really because I'm stumped. My initial thoughts were it could be one of the following:

1) The fact they are in a ve.smart network as well as being managed by the CerboGX
2) The MPPT firmware has a bug

Some screenshots showing a few of the dropouts I have plenty other data if it helps :)

[image]


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semlohnhoj asked
seb71 commented ·

0 Answers

Smartsolar MPPT 100/20 Earthing

I’ve just purchased the above charge controller, confused by the earthing connection on the heat sink.

Could somebody advise it’s correct use?

Normally Earthing relates to mains equipment not low voltage!

bazza12 asked
bazza12 commented ·

1 Answer

Smart Solar MPPT Tr

Thanks to all the advice and explanations of the difference between several models of MPPT 150-70 , i am going to order the 150-70 Smart Solar Tr . I have just 3 more points im unsure about .

Can a Smart Solar MPPT temperature and voltage be controlled from the Cerbo using DVCC

Can the Smart Solar be connected to a Cerbo via a VE Direct to USB cable or does it have to be a VE Direct to VE Direct

How are the settings transferred to the MPPT if its set up Using Victron Connect on a Windows Laptop . On VRM i did this on a Multiplus with VE Configure and uploaded a file when prompted .

ako asked
klim8skeptic answered ·

1 Answer

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