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how can I force chargeing from PV only / disable feed-in until batteries are full

Hi Folks,

during winter season, daily PV yield is not sufficient to fully recharge the batteries, especialy when direct consumption is also part of the usage.

My DSO does allow PV feed-in but does not allow chargeing from grid.

Using battery life alone, it would take weeks until a SoC of 100% can be reached, because discharging would still be allowed.

I'd rather find a solution to use almost all (and only) PV for chargeing, as well as prevent discharging until a SOC of 100% has been reached.

What would be the best option, given that I have Node-Red and the Cerbo with activated mqtt at hand?

My first guess is, to set the grid-setpoint to the value of the actual grid-consumption (so direct usage of PV will not take place, as all PV will be used for chargeing the batteries) .... do this until SOC of 100% has been reached, then return to a standard grid setpoint.

When minimum SOC has been reached, restart that procedure.

hominidae asked
hominidae commented ·

1 Answer

Victron Lead Acid Batteries - Failure ?

All Victron batteries must have a manufacturing error after a lot of test and research on around 300 batteries from Victron mainly super cycle 25AH over 250 and 18 batteries Gel Deep Cycle 220Ah.

Most of the super cycle they fail within 6 months to 1 year even if you have them on float voltage and not cycling them, if cycling them on a solar system best you can get is 6 months. 30% got a catastrophic effect of swelling. Other manufacture of batteries with 4 year floating still there and running without a problem the only difference is that is 18Ah instead of 25Ah.

After 1year of using them new ones with serial numbers came out thinking they fixed the problem but at the end they all failed from 25Ah day one measured with a proper load tester they all end up at 3Ah the ones that are always on float voltage , the ones doing cycles are 100% dead. It was a big loss for us and there is no support or guaranty from our local dealer since they are not replying to our calls. They tried at the beginning to help but that didn't help since there is no response.

The 220Ah at a controlled environment at 25-30 degrees Celsius 70% state of charge as a discharge they get a half capacity if not less on some of them after 1 year.

After 1 year and 2 months it was failing cause of some of the cells in series of the 4 was actually close to 50Ah and some on 119Ah on 2 strings parallel of 4 in series.

All batteries show a good voltage like a new graph but with the difference of the capacity instead of 220Ah there new capacity 120Ah or 50Ah, on the small ones 25Ah when new but after 6 months to 1 year 3Ah if not swelling.

Note that internal resistance was measured but it can’t be trusted since it was showing good on a lot of cases but the capacity was not there, most test where done with C20 and C10 when new even C2 was good.

Hope this 2 year test and research on Victron batteries will help.

What is your experience with the Victron Lead Acid Batteries?

Alexandros asked
Alexandros edited ·

0 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

Absorption voltage LiFePo4

Hi everyone

I read that the max voltage for a 3S LiFePo4 battery is defined at 12.60 volts. (Absolute maximum is set to 4.20 volts per cell)

So I wonder, why is the default absorption voltage in the SmartSolar MPPT 75/10 Charger for a 12.0 V battery, while choosing the Smart Lithium battery preset, set o 14.20 volts?

Even the float voltage is set at 13.50 volts which is also higher than the recommended max voltage of 12.60 volts.

Will these settings not damage the LiFePo4 battery?

Thank you,

Martin

martin-haemmerli asked
Stefanie commented ·

4 Answers

24V / 100AH LiFePo Battery not charging fully with IP67 24Vcharger

I have a 6 month old 24v / 100AH lithium battery that I can't seem to charge fully. I have been through 20 cycles with the Victron IP67 24v charger and the most I can get is around 10 amp hours. Charge mode is always the default Li-ion mode. I should not the first time I charged it took almost the full 100AH after purchase from store. The voltages all look correct but the charger goes into storage mode after about 1-2 hours. At most I get 3-5hrs of use with a draw of around 4-5AH, and then the battery dies. I have even hooked up to portable fridge / freezer, and it also gives out over the same time period. This is the second battery I have had the same issue with. All charger diagnostic looks good but can't get more than 10AH per charge even after leaving on for days.

The battery can take 40AH input ...

Help

lithiumboatbattery asked
kevgermany commented ·

3 Answers

GEL batteries failing after 6 months?

Hello.

I upgraded my boat batteries and charging system 6 months ago.

6x 220AH GEL diagonal wired in series parallel with carefully identical cable lengths.

660AH@24V.

Charged with a Multiplus programmed for Victron GEL batteries and set to 70A max charge rate. Monitored with a Smart shunt. 4x95mm cables to the Multi.

System worked great, they have been cycled down to 85-90% about 4 times no problems, then this week, lost shore power and had a voltage alarm at 92%, 22V.

After a full charge to float, I consumed 30A out of them for approx 1.5hr, watching the voltage steadily drop from 26-24.5V as seems typical, then suddenly they 'collapsed' to 22V.

I disconnected them all, charged with a 12V compact multi I have and painstakingly performed steady discharge tests on each single battery, they all perform as expected until about 90%, then the voltage 'collapses'.

I have not seen this behaviour before, any experts out know what might be the cause?

Thanks in advance.

colinfdr asked
billt answered ·

3 Answers

Lifepo charge limitation

For Lifepo batterys its better to limitate charging. Is it possible with Victron MPPT 150/60 to limitate charging to 80%?

Lifepo Akkus sollten nicht unbedingt auf 100% geladen werden. Gibt es eine Möglichkeit, beim Victron MPPT 150/60 die Ladung auf 80% zu begrenzen?

clerosch asked
Matthias Lange - DE commented ·

2 Answers

Quality of leroy Marlin Xunzel agm battery?

Last week I bought an agm solar battery from leroy Marlin.

Name solarix, brand Xunzel.

Is leroy Marlin brand for all solar accessories.

I will use it to support my agm victronenergy, either separately or in parallel as needed.

It has charging and internal resistance characteristics very similar to the victronenergy and this is good for parallel.

In fact, measuring with a schunt the current was divided almost perfectly (in relation to the capacity).


What do you think of these batteries and this brand?

They are medium quality batteries ... Not at the level of agm rolls or troyan, but not bad either.

The price range is about that of victronenergy agm batteries.

The data sheet is very interesting:

It performs worse in cold weather than victronenergy.

It has performances similar to victronenergy in terms of capacity in relation to the C rate, but victronenergy is slightly higher.


But it has performances of duration in cycles and in years much superior to the agm victronenergy.


100% DOD: unknown victronenergy, xunzel 400 cycles.


80% DOD: victronenergy 400 cycles, xunzel 600 cycles.


50% DOD: victronenergy 600 cycles, xunzel 900 cycles


30% DOD: victronenergy 1500 cycles, xunzel 1300 cycles.

10% DOD: unknown victronenergy, xunzel over 2000 cycles.

Standby use at 20 C°: victronenergy 7/10 years, xunzel 10/14 years.


Basically it appears that these xunzel agm have high DOD performance, similar to victron agm supercycle.

Victronenergy deep cycle AGM years or cycle duration is not exceptional for a solar battery at these price.


Here the two datasheets:

https://www.xunzel.com/shared-files/13811/DATASHEET-SOLARX-XUNZEL-ENG4.pdf


https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.victronenergy.com/upload/documents/Datasheet-GEL-and-AGM-Batteries-EN.pdf&ved=2ahUKEwiI8ILd1fX0AhXRzaQKQVTxCusQ= AOvVaw0AWZwMcTcRp-3RcREF_PXQ


Fra asked
klim8skeptic commented ·

3 Answers

SmartSolar Batterylife

I have a SmartSolar MPPT 100/30 (firmware v1.59) installed in my camper van. The load output operation mode is set to "batterylife".

How can I see what the active SoC limit has been set to?

I do not have ESS assistant installed because I am never sending power back to the grid - just charging the battery from solar or the alternator in the van. I had the battery shut down recently around 60%, so the batterylife algorithm appears to be having some effect.

I have added a widget to the VRM portal showing "ESS battery life SoC limit (%)", but this only shows a continuous 10% which is where the static SoC limit is set.

cabadger asked

0 Answers

MPPT 75/10 flashing green (2Hz)

Testing out a new MPPT 75/10 along with a small solar panel (3 pcs 6V/3W panels in series) and an used 80Ah AGM battery.

I notice that even after several days og sunshine and with not consumption, the green LED flashed twice a second to indicate BatteryLife.

Battery voltage is 13.0V - 13.2V.

Does this indicate a dead battery?

Or should I just add a propper solar panel to get things going?
What are good threshold values for an AGM battery?

mogul asked
mogul answered ·

3 Answers

On a Blue Solar MPPT with load output, For the "Battery Life" setting, how often is the voltage being read?

I have an issue with a Renogy self-warming battery: during the warming cycle preceding the charge, the voltage at the battery terminal is dictated by the resistance of the heating element and the voltage setup in my MPPT for a LiFePO4 battery of 14.4V.

This voltage leads my inverter to believe that the battery has reached a full charge voltage and proceed to start inverting on a nearly depleted battery. I need to know how often the setting "Battery Life" takes a reading sample in order to determine the SOC. Is it daily, hourly, multiple times per second? Any information from the manufacturer about his would be really useful, thank you.

@Johannes Boonstra (Victron Energy Staff)

u410998 asked
Johannes Boonstra (Victron Energy Staff) answered ·

1 Answer

Victron Easy solar 2 (48 / 3000VA) Charge controller current limiting "due to limited 48V-200AH Tubular battery Capacity"

Dear VICTRON support community,

Warm Greetings from Syria,

I am seeking your kind advice over the below residential setup please :

1- If I have a (Victron Easysolar II (48/3000)) product, which is connected to two PV strings joined in Parallel, each String has {4 x in-series (540W PV-Panels)}.

2-I do also have a limited battery capacity connected to the system as this is what I can currently afford, {48 Volt, 200 AH, Lead Acid Tubular Battery}.

3- Now considering the limited battery capacity I have, and as the included MPPT charge controller is 250/70, I do believe that it's necessary to limit the charging current of the MPPT down to 200/6=33 Amps as I don't want to cause any battery damage.


My question is: if I do limit the MPPT Charging current will that also affect/Limit my max Direct-sunlight Solar-power AC supply capacity? in other words will my max AC output power from the inverter be limited to: 33Amps x 48 = 1584 Watts. ? ..... no matter how bright the sunshine is?

Does the Victron system implementation have a way around this?

Thank you in advance for considering & addressing my Question as I am new to this community and to the solar domain in general.

With my kindest regards to all

rami-alaryan asked
rami-alaryan commented ·

1 Answer

Configuration mppt 100/50 sur batteries de voiture

Je ne trouve pas le réglage de 0 à 7 pour utiliser des batteries de voiture .

C'est tout ce j'ai pour l'instant .

Merci

le-patou asked
le-patou answered ·

4 Answers

[Feature request] Limit active SoC Limit

I'm not sure if this is the correct place to ask for new/improved features.. But here I go.

Im using Victron ESS with BatteryLife. In this weather there can be a week or two with clouds and almost no PV output, and then suddenly there's a day with lots of sunshine where I generate up to 20 kWh day.

However, due to the previous bad weather.. BatteryLife has increased the active soc limit to a high number, 85% in my situation currently.

I would like to request a additional feature ('partial BatteryLife') that limits the active SoC Limit 50% for a couple of reasons:

- AFAIK 50% SoC is ideal for Li-Ion batteries or atleast is better than running at 90-100% SoC for days or maybe even weeks.

- It allows for increased self-consumption by having 50% of the battery capacity available instead of sometimes just 5% if Active SoC limit is 95%

I don't see any disadvantages to having the Active SoC Limited to 50%





tozz asked
nickdb commented ·

2 Answers

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