Victron just turned my solar panels off

[1 Cup]

New updat to solar mttp = temperature

this is set at 0 degrees . Ouch.
Went into setting and told it to charge down to -3

I dont have a temperature wire or settings till now updated mine 7 days ago !

so its been turned off to save battery at 0 Degrees
Got new software update for b2b now see engine batt without opening

 

[1 Cup]

so it has a temperature sensor inbuilt ! But its not as good as a wired one I only use the bluetooth network.!
Mine was set at factory default. So why didn't it turn it back on ?
Why remove temperature and the digets from from mttp display list ?.
As pic

 

[wildebus]

Something people should be aware of with the Victron MPPT built-in Temp sensor ....
When the controller wakes up, the temp is recorded and that temp is set for the entire session. This could stop solar working for the whole day if cold enough. OR allow batteries to charge when too cold if temp drops during the day.
Best not to rely on that and use an external sensor instead such as the SBS

 

[Nabsim]

Why would you set 5 degrees to stop charging from an mppt? You aren’t throwing lots of amps into the battery are you? I know i have never had to stop my solar even on the coldest days, there was never enough to worry about

 

[Fisherman]

Why would you set 5 degrees to stop charging from an mppt? You aren’t throwing lots of amps into the battery are you? I know i have never had to stop my solar even on the coldest days, there was never enough to worry about

If you have lithium batteries without heaters you will damage them if you charge them at low temperature.

Charging Your Lithium Battery Below Zero - DC Battery Technologies

How to correctly charge your Lithium Battery is a frequently asked question. By following this simple guide, you will have all the knowledge to look after your battery efficiently!

dcbattery.tech

 

[1 Cup]

Why would you set 5 degrees to stop charging from an mppt? You aren’t throwing lots of amps into the battery are you? I know i have never had to stop my solar even on the coldest days, there was never enough to worry about

Victron 100/30 set it as default 5 degrees. but mppt never turn off and stayed off. For 7 days .befor this and hasn't gone below +3 .

Put it back at +5 today mppt is up in the roof .

 

[Geek]

You can trickle charge slowly at low temperatures. I guess that if you had lots of solar panel and it was a sunny cold day you might get a damaging current, but it seems unlikely.

 

[1 Cup]

Lithium and the cold

I just turn mppt off if I know its close to zero. When at home / stored. App
Got to get some more information on low amp charging say under 5 amps or lower.?

This is the first time I've had mppt turn off and show temperature ! but no warning loged, as it dose with over voltage !.

 

[Nabsim]

Lithium and the cold

I just turn mppt off if I know its close to zero. When at home / stored. App
Got to get some more information on low amp charging say under 5 amps or lower.?

This is the first time I've had mppt turn off and show temperature ! but no warning loged, as it dose with over voltage !.

Have a look at the spec sheet for your actual batteries as I don’t think they all say the same thing. I know I can charge mine at zero degrees but at reduced rate, I have temperature sensors and battery’s are inside and it’s rare mine drop below 5 degrees and solar has never been enough to worry when it is. I only have 300W flat on the roof though.

Never had my Victron MPPT turn itself off (yet) but one of my IP22 chargers does some funny things at times (45a from a 30a charger). I am not one who believes all the Victron hype though either.

 

[merl]

Correct.
There is nothing magical about the Zero degree temperature figure despite what is often touted as fact.
The statement "Dont charge below zero" is an over simplified statement and in fact maximum 'safe' charge current for Lifepo4 tapers off gradually as the temperature lowers and actually also at the battery gets closer to full charge. Its complicated!
Charging at the kind of current you'll get from a van roof solar array at this time of year wont be detrimental to Li batteries at say -5 deg unless you're very close to full charge.
What IS damaging to Lifpo4 is keeping them absolutely 100% fully charged so if your vans sitting idle AND you have solar consider reducing the maximum cell voltage/capacity setting. A simpler way is to charge to around 50% and disconnect the battery/batteries completely (providing you've not got an alarm etc powered from them obviously)
Even full timers should consider reducing the max cell voltage slightly to around 3.5v/cell (14V). Charge speed will be slightly slower and you'll lose a bit of capacity (not much, only a couple of %) but your batteries will appreciate it long term.

 

[wildebus]

Correct.
There is nothing magical about the Zero degree temperature figure despite what is often touted as fact.
The statement "Dont charge below zero" is an over simplified statement and in fact maximum 'safe' charge current for Lifepo4 tapers off gradually as the temperature lowers and actually also at the battery gets closer to full charge. Its complicated!
Charging at the kind of current you'll get from a van roof solar array at this time of year wont be detrimental to Li batteries at say -5 deg unless you're very close to full charge.
What IS damaging to Lifpo4 is keeping them absolutely 100% fully charged so if your vans sitting idle AND you have solar consider reducing the maximum cell voltage/capacity setting. A simpler way is to charge to around 50% and disconnect the battery/batteries completely (providing you've not got an alarm etc powered from them obviously)
Even full timers should consider reducing the max cell voltage slightly to around 3.5v/cell (14V). Charge speed will be slightly slower and you'll lose a bit of capacity (not much, only a couple of %) but your batteries will appreciate it long term.

good to see you are aware of this now

 

[merl]

Always had an analytical and curious mind David. Sometimes it get's me in hot water unfortunately.

 

[1 Cup]

As you can save setting on victron I have 2 saved for mppt 1 is stored so voltage is 13.5v and the other is full set at 14.2v and change them over as and when.
I've been playing with the new inverter. 78amps out on 1 hob nice.@ smart shunt.14.2v = 100%

 

[1 Cup]

So setting on blue tooth as pic






Inverter

1 liter cold water is 14 amps to whistle. About 15 mins