Am I in the right ballpark with these calculations?

[GoldenVision]

We have 420Ah of battery, a 1500 watt air fryer and a 2000 watt inverter. Running the fryer for 20 mins reduced the battery by 5%.

I'm interested to see how the figures stack up.

So running the fryer for an hour would equal 1500Wh, so for 20 min that's 500Wh.

To convert to Ah, we divide by volts, (12?) to give 42 Ah, which is 10% of the battery, not 5%.

I realise that the fryer would turn itself on and off during the 20 mins, but it would only have to be on half the time. And then there is the inefficiency of the inverter to take into account.


So I wonder if someone could tell me if I'm in the right ballpark with these all of this? Or way out

 

[AdrianChen]

Using 90% inverter efficiency, and 12.8v nominal from your battery I get 10.2%, so I presume the fryer is cycling as you say.

What gives you the 5% figure, and what type of battery?

 

[GoldenVision]

Using 90% inverter efficiency, and 12.8v nominal from your battery I get 10.2%, so I presume the fryer is cycling as you say.

What gives you the 5% figure, and what type of battery?

2 x 210 lithium, and the 5% from it's associated app.

 

[AdrianChen]

2 x 210 lithium, and the 5% from it's associated app.

OK may not be 100% accurate, but shouldn't be far off, so the air fryer must be cycling - which is good news!

Can the app show any history or realtime amp draw - would be interesting to watch it once it has warmed up....

 

[GoldenVision]

Can the app show any history or realtime amp draw - would be interesting to watch it once it has warmed up....

Yes. I'll investigate next time we use it. And thanks for your comments.

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[Just smiffy]

What charging method do you use, if your plugged in or have a fair amount of solar that will replenish some amps while the fryer is used…

 

[Tombola]

so youve took 20ah from the batts, decent going that, 240wh. the inverter wont have even used an amp

so you could cook chips for all the camp..winner

 

[GoldenVision]

What charging method do you use, if your plugged in or have a fair amount of solar that will replenish some amps while the fryer is used…

True, but we didn't have EHU and there was no solar as it was dark.

 

[Tombola]

Do you not trust the app, or just a general check

 

[GoldenVision]

Do you not trust the app, or just a general check

I do trust the app, but I just wanted to know how to calculate the amp usage. Just out of interest really.

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[Tombola]

are they fogstar batteries /app

 

[GoldenVision]

are they fogstar batteries /app

KS Energy under seat batteries

 

[Tombola]

KS Energy under seat batteries

I have the KS ones, 2x 200ah, v2 of the app can be a bit clunky, but always seemed accurate when using

 

[GoldenVision]

I have the KS ones, 2x 200ah, v2 of the app can be a bit clunky, but always seemed accurate when using

I'm using V3.2.035. No idea if that's the latest version, but it does seem to work ok.

 

[cyberyacht]

How can you discover which version of the app you are running. Can't find anything to indicate on my iPhone 8

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[GoldenVision]

I use Android, so it's going to be different. The app is XiaoXiangElectric (Little Elephant Electric) and bottom right on the main screen is an icon Mine which gives the info. The app isn't particularly well reviewed, but it works on for me.

 

[TheCaller]

Air fryers do cycle on & off once up to temperature. Only the fan stays on all the time. I was surprised to see how much time they spent with the heating element off, so your estimate of actual consumption being around half the rated power sounds feasible.

 

[GoldenVision]

Air fryers do cycle on & off once up to temperature. Only the fan stays on all the time. I was surprised to see how much time they spent with the heating element off, so your estimate of actual consumption being around half the rated power sounds feasible.

Thanks. Yes, that was my conclusion.

 

[Ponner]

Jesus you lot
Get a life

 

[GoldenVision]

You have to eat...

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[DavidG58]

As soon as we turn our inverter on we draw quite a few Amps even without a load on it, I am not overly technical but think you may have over simplified the maths

 

[funflair]

As soon as we turn our inverter on we draw quite a few Amps even without a load on it, I am not overly technical but think you may have over simplified the maths

It shouldn't take that much in standby David as long as there is nothing else connected, I know ours doesn't.

 

[AdrianChen]

Our Multiplus II 3000/120 spec is in watts:

We mostly only switch it on when needed so 13w, but have tried search mode which is only 3w

A lot depends on the make of inverter I guess.....