Inverter settings

Barriesimpson

Barriesimpson

Joined
May 28, 2024
Posts
2,258
Likes collected
9,592
Location
Maspalomas, Spain
Funster No
103,439
MH
Giottiline Toscan 74
Exp
2024
Does an inverter have specific settings like chargers do? So would I need to change anything after replacing the AGM batteries with a lithium one? I ask because this afternoon while using the 'air fryer' it suddenly cut out and the error light on the inverter panel came on. The battery SOC was around 56% so I thought maybe the inverter thinks it's still AGM and shut off so as not to damage the battery. I've been searching the net but have not found any information about settings for different batteries. All is now working again, as expected albeit I have not tried the 'air fryer' again yet. Any ideas guys 'n girls?
 
Not sure what inverter you have but on ours it only needs 12v a d lots of it, it does have low battery alarm and if you pull too much power. What wattage is air fryer a d max draw on startup also what's max draw on battery?
 
MichaelT said:
Not sure what inverter you have but on ours it only needs 12v a d lots of it, it does have low battery alarm and if you pull too much power. What wattage is air fryer a d max draw on startup also what's max draw on battery?
Click to expand...
Well it's a Vechline Pure Sine 2.000w inverter, the fryer is 1.400W and the battery is a lithium 280ah. This is the first time out of maybe 6 (not had the battery long) that this has happened and it never happened with the AGM batteries, but it is also the first time I took the lithium battery down to 56% SOC, hence the question.
 
Barriesimpson said:
Well it's a Vechline Pure Sine 2.000w inverter, the fryer is 1.400W and the battery is a lithium 280ah. This is the first time out of maybe 6 (not had the battery long) that this has happened and it never happened with the AGM batteries, but it is also the first time I took the lithium battery down to 56% SOC, hence the question.
Click to expand...
56%should be ok our 1400w runs fine at 20%.It could be resistance in the feed to the inverter or battery cut off set to high in BMS or if adjustable inverter cut off voltage set high...but that's unlikely as it was ok with AGM.shunt cut off too high volts or amps if applicable,is it BT battery?
 
oldiesontour said:
56%should be ok our 1400w runs fine at 20%.It could be resistance in the feed to the inverter or battery cut off set to high in BMS or if adjustable inverter cut off voltage set high...but that's unlikely as it was ok with AGM.shunt cut off too high volts or amps if applicable,is it BT battery?
Click to expand...
Yes it is BT but I do not yet have a shunt as I thought I could get by without one. I'll check the settings in the BMS, thanks.

Subscribers  do not see these advertisements

 
oldiesontour said:
56%should be ok our 1400w runs fine at 20%.It could be resistance in the feed to the inverter or battery cut off set to high in BMS or if adjustable inverter cut off voltage set high...but that's unlikely as it was ok with AGM.shunt cut off too high volts or amps if applicable,is it BT battery?
Click to expand...
If adjustable!! it might need the potentiometer adjusting to allow for the lower discharge. I had to raise the ceiling on my Sunshine Solar one as factory set it was to low, going to fault when it saw 14.40 v. It was about 1/32 of a turn, and a bit of guess work but it seems OK now. Adjusting either way up or down affects the voltage at the other end of the scale.
Mike
 
These are the settings at the moment, I honestly do not know if they are good or not, but the battery came with these settings so I must assume they are optimal.
1000067319.webp
 
1400W with some ineffiencies between the air fryer and the battery (mainly the inverter) added in could be something like 130A so you're pretty close to that discharge overcurrent limit. Any other significant current draws going on at the same time elsewhere?
 
mikash said:
1400W with some ineffiencies between the air fryer and the battery (mainly the inverter) added in could be something like 130A so you're pretty close to that discharge overcurrent limit. Any other significant current draws going on at the same time elsewhere?
Click to expand...
No, at the time there was nothing else running off the inverter, but I see what you are saying. Maybe there was a spike? The fryer is a cheap one, nothing special, maybe that was the problem.
 
Are your inverter cables the correct size? It is likely that you have a voltage drop along the cables and the inverter is seeing a low voltage when under load.

Ian

Subscribers  do not see these advertisements

 
Can you monitor the BMS when air fryer is on to see what amps it "thinks" it is pulling? That may lead you to the issue.
 
Barriesimpson said:
No, at the time there was nothing else running off the inverter, but I see what you are saying. Maybe there was a spike? The fryer is a cheap one, nothing special, maybe that was the problem.
Click to expand...
Spike is definitely a possibility.
Doesn't need to be additional inverter load though, for the BMS the inverter is just a DC load like any other. A fridge compressor kicking in for example could be such a significant DC load that might push the amps over the limit if the air fryer was running.
 
I would try lowering the low volt protect to 10.5 and try it,if that doesn't do it try raising current to 165 ( so long as that is within your battery max disscharge current that is hopefully 200a
 
Looking at your settings I suspect the BMS in the battery is shutting down the battery. The air fryer will be drawing approx 135 amps at max so with other items on in the van you are probably exceeding the max of 145 amps.

What is the battery so I can look up the spec.
 
bigtwin said:
Are your inverter cables the correct size? It is likely that you have a voltage drop along the cables and the inverter is seeing a low voltage when under load.

Ian
Click to expand...
They are the cables that the dealer fitted when I bought the van, I would like to think they are of the correct size.

Subscribers  do not see these advertisements

 
Lenny HB said:
Looking at your settings I suspect the BMS in the battery is shutting down the battery. The air fryer will be drawing approx 135 amps at max so with other items on in the van you are probably exceeding the max of 145 amps.

What is the battery so I can look up the spec.
Click to expand...
It's a local build battery Cymasol is the company, probably not known outside of the Canaries

BATERÍA LIFEPO4 12.8V 280AH 3584WH CYM-POWER​

 
mikash said:
Spike is definitely a possibility.
Doesn't need to be additional inverter load though, for the BMS the inverter is just a DC load like any other. A fridge compressor kicking in for example could be such a significant DC load that might push the amps over the limit if the air fryer was running.
Click to expand...
No fridge, ours is a 3 way Thetford.
 
To find out you'll need to replicate the scenario, and watch the bms for low voltage and high amps. Without data is just speculation.
If voltage does not dip bellow bms settings, and amps are below the bms setting, it may be the setting in your inverter, or the cables and connections. I doubt is the settings.
Anyway, that is a fair load on a single battery and bms.

Subscribers  do not see these advertisements

 
oldiesontour said:
No reason to suspect any of the hardware at this stage as all was ok prior to battery swop
Click to expand...
Yes, exactly and it has only happened once, at least so far. I'll be using the fryer again tomorrow, so we'll see if it happens again.
 
So it appears to be 150a output ,so it's sailing close to the wind ,as Raul says checking voltage drop is a good start

Subscribers  do not see these advertisements

 
Barriesimpson said:
This is what the manufacturer says:

Está equipada con un sistema de gestión de batería (BMS) inteligente 12V 150A 1.8KW Cym-Power

So equipped with intelligent BMS 12v 150a 1.8kw
Click to expand...
The best options would be either fit a second battery or get a smaller air fryer.
 
oldiesontour said:
For the price of that battery cheaper to eat out ::bigsmile:
Click to expand...
Yeah, but I love cooking in the van and the missus appreciates it too and that way there is more to spend on wine.....

Subscribers  do not see these advertisements

 

Join us or log in to post a reply.

To join in you must be a member of MotorhomeFun

Join MotorhomeFun

Join us, it quick and easy!

Join us

Log in

Already a member? Log in here.

Latest journal entries

Back
Top