2 x 100Ah LiFePO4 - using 2400w = a possible 55 minutes?

[Peter Clark]

2 x 100Ah LiFePO4 - using 2400w = a possible 55 minutes?

Using an online calculator I arrived at this figure.

Would anyone with real world expertise say this number is in the right ballpark?

PS: Victron batteries via Victron 3000w inverter.

 

[Phil Spectrum]

My suggestion, get a slow cooker instead.
200w on high power.
Get one with a digital timer and "keep warm" function.

Then you just prep your meal in the morning and have adventures.
Meal is cooked ready when you return regardless of if you get back late afternoon, evening, midnight etc.
That's what I do anyway.

 

[cyberyacht]

Does restrict you to casserole/stew type meals though.

 

[jongood]

Peter Clark if you did want to add battery capacity but lack room I'm fairly sure you can stack lifePo4 or fit them on their sides.

 

[MobyDick57]

Hi Peter C
If you are fitting 2 x 100ah lithium batteries, then I would recommend you check their charging/discharging figures. The more expensive batteries can charge at 1C (100amps/hr) and discharge at 1C (again 100amps/hr). Having had lithium for 4 years, I would recommend you purchase these types, however ensure you charge/discharge at no more than 100amps/hour = 2 x 1/2C. That is if you wish to have them last! 100amps/hour equates to using a 700w microwave or 1400w hot plate.
When it comes to charging, I suggest you investigate an alternator charger of 60amps, however check your engine is fitted with an alternator upgrade Especially if you plan to drive regularly as opposed to parking up for lengthy stops.
Hope this helps

^{_{Subscribers  do not see these advertisements}}

 

[Gromett]

Just curious. But doesn't your oven have any insulation? Is it open to the elements?

If not, Then it will be operating at full power until it is up to temperature then switch the heater off until the temp drops a bit. It won't operate 100% of the time.

 

[newtonz]

Have you considered that most cooking devices use full power to reach temperature, then switched or modulated power to maintain the temperature. So, your straight-line calculation may overestimate the demand on the batteries.

 

[Peter Clark]

My suggestion, get a slow cooker instead.
200w on high power.
Get one with a digital timer and "keep warm" function.

Then you just prep your meal in the morning and have adventures.
Meal is cooked ready when you return regardless of if you get back late afternoon, evening, midnight etc.
That's what I do anyway.

Agree Slow Cookers are great - but I’m looking for an oven cooking capability y to do specific types of cooking

 

[Peter Clark]

Peter Clark if you did want to add battery capacity but lack room I'm fairly sure you can stack lifePo4 or fit them on their sides.

Some you can put on side - some not.
You need to check with each manufacturer - seems to depend on which way they choose to orientate the cells when the design/manufacturing spec is set.

 

[Guigsy]

An air fryer rated at 2.4kW won't pull that all the time. It'll be thermostatic, they get up to temperature pretty quickly, after that it'll just just blip on and off as it maintains the temperature.

^{_{Subscribers  do not see these advertisements}}

 

[Peter Clark]

An air fryer rated at 2.4kW won't pull that all the time. It'll be thermostatic, they get up to temperature pretty quickly, after that it'll just just blip on and off as it maintains the temperature.

Very good point
Going to a festival with friends next month who have a Ninja Foodi multi oven - so they will bring for me to try out and see how it affects the batteries.

 

[Guigsy]

Very good point
Going to a festival with friends next month who have a Ninja Foodi multi oven - so they will bring for me to try out and see how it affects the batteries.

Might be worth getting one of those watt measurement plugs and cook a meal at home and see how it behaves.

 

[jongood]

Some you can put on side - some not.
You need to check with each manufacturer - seems to depend on which way they choose to orientate the cells when the design/manufacturing spec is set.

I'm pretty sure its most because there is nothing to leak, but yes wouuld be prudent to check, if that might help you to increase capacity 200ah isnt a lot for your aspirations, maybe 2x 150s instead? Or even 2 different sizes, LiFePo4 doesnt use the same rulebook.

Btw have you updated your chargers?

 

[Peter Clark]

I'm pretty sure its most because there is nothing to leak, but yes wouuld be prudent to check, if that might help you to increase capacity 200ah isnt a lot for your aspirations, maybe 2x 150s instead? Or even 2 different sizes, LiFePo4 doesnt use the same rulebook.

Btw have you updated your chargers?

Yes chargers being updated

 

[Hoovie]

Some you can put on side - some not.
You need to check with each manufacturer - seems to depend on which way they choose to orientate the cells when the design/manufacturing spec is set.

It is useful to point this out. There is often an automatic assumption that Lithiums can always be fitting in any orientation.

^{_{Subscribers  do not see these advertisements}}

 

[Gromett]

Have you considered that most cooking devices use full power to reach temperature, then switched or modulated power to maintain the temperature. So, your straight-line calculation may overestimate the demand on the batteries.

An air fryer rated at 2.4kW won't pull that all the time. It'll be thermostatic, they get up to temperature pretty quickly, after that it'll just just blip on and off as it maintains the temperature.

Pretty sure I already said that

Turns out I am not good at explaining things lol

 

[Peter Clark]

Hi Peter C
If you are fitting 2 x 100ah lithium batteries, then I would recommend you check their charging/discharging figures. The more expensive batteries can charge at 1C (100amps/hr) and discharge at 1C (again 100amps/hr). Having had lithium for 4 years, I would recommend you purchase these types, however ensure you charge/discharge at no more than 100amps/hour = 2 x 1/2C. That is if you wish to have them last! 100amps/hour equates to using a 700w microwave or 1400w hot plate.
When it comes to charging, I suggest you investigate an alternator charger of 60amps, however check your engine is fitted with an alternator upgrade Especially if you plan to drive regularly as opposed to parking up for lengthy stops.
Hope this helps

The batteries are 100Ah Victron (all kit is Victron except solar panels)
I believe the B2B being spec’d is 30 amp.

I’m putting myself in the hands of Ian Jordan - Vanward UK in Loughborough - he seems to be a competent young man with a good reputation in the adventure van community.

His price for a Victron based off grid power system is very competitive and ultimately I feel comfortable that he is a genuine guy who sees my interests as on par with his own.

When the installation is done and I have some experience of using it, I will post a review as to wether or not my judgement proved to be sound - or not

 

[Langtoftlad]

Does restrict you to casserole/stew type meals though.

Not really.

 

[MobyDick57]

The batteries are 100Ah Victron (all kit is Victron except solar panels)
I believe the B2B being spec’d is 30 amp.

I’m putting myself in the hands of Ian Jordan - Vanward UK in Loughborough - he seems to be a competent young man with a good reputation in the adventure van community.

His price for a Victron based off grid power system is very competitive and ultimately I feel comfortable that he is a genuine guy who sees my interests as on par with his own.

When the installation is done and I have some experience of using it, I will post a review as to wether or not my judgement proved to be sound - or not

Hi Peter
Just checked victron smart lithium batteries recommend max discharge ah are 1/2C. Therefore max discharge for 100ah x 2 is 100ah.
I would check with your fitter, but these batteries will not like you exceeding a discharge above 100ah. I had 2 similar discharge batteries fitted, but had to reject them and replaced with 2 x 100ah batteries with a max discharge of 1C each = 200 ah. It will be the battery management systems BMS that will reject what you are proposing!