Lithium Ah to A.C. Kw conversion rates

[bigtwin]

Just looked at the spec sheets for the batteries the fitter supplies, Eleksol. (Made here in Spain)

It's confusing.
Corriente de descarga continua - Continuous discharge current
Corriente de descarga continua máxima - Maximum continuous discharge current

200ah - max continuous current = 100a, continuous maximum 200a, but for how long ?

View attachment 943620


150ah - max continuous current = 75ah OR 150ah but for how long?
View attachment 943618

I assume that with 2x150 my max continuous draw should be < 150a (2x75). That how it works ?

Confusing to say the least!

If you have two batteries in parallel then each can supply their maximum discharge current (if demanded) such that the maximum delivery capability is, to all intents and purposes, double that of a single battery.

Ian

 

[Raul]

What I'm really looking for is working examples of lithium capacity & usage.

" We have 100ah lithium and 50w solar and do roast beef & Yorkshires for six in the air-frier on rainy days in a farmer's field"

Sort of thing ...

Just work in W and Wh. Its more accurate and simple. A lifepo4 100ah has 1280wh of energy fully charged. Take whatever watts of your cooking out of the full battery, then you left with the difference, simple. A Ah without a voltage reference is meaningless, and voltage fluctuates with charge discharge and load size, watts are the same at any point in time.

 

[autorouter]

s there a formulae/rule of thumb for estimating in advance how many Ah an 'x' Kw device will use ?
If I use a 2kw induction hob for 30 mins what Ah will that take out of the battery ?

The watts is the rate at which the device uses energy. Energy is measured in watt-hours (Wh) or kilowatt-hours (kWh). A 2kW induction hob will use 2kWh of energy per hour.

A 2kW induction hob for 30 mins will use 2000W x 0.5h = 1000Wh = 1kWh of energy

The amps is the rate at which charge flows into/out of the battery. Charge is measured in amp-hours (Ah). If a current of 80A flows out of a battery for 30 mins, then the amount of charge flowing out of the battery in that time is 80A x 0.5h = 40Ah of charge.

The charge flows in and out of the battery, carrying energy with it. If the battery voltage is 12V, then each Ah of charge carries 12Wh of energy. That's basically what '12 Volts' means.

So if you want to take 1kWh of energy from a 12V battery, you need to take out 1000/12 = 83Ah of charge from the battery.

That's the theory. You have to account for the efficiency of the inverter, usually about 90%

 

[MisterB]

shame you cant get the cheapest battery you can, then come over to the UK and get it installed here at what i assume might be better price,

as an example of use, we have a single 304Ah fogstar lithium and a 3000w renogy inverter. we can use the microwave and electric kettle both at the same time, along with tv and other 12v appliances.

we can last around 4 days off grid without any solar .....

 

[Nigel Crompton]

shame you cant get the chepaest battery you can, then come over to the UK and get it installed here at what i assume might be better price,

At least 1600km & 18hrs driving just to get to & from Bilbao; I think not!
If I visited the UK in the tin-tent or other reasons I would certainly have thought about it ...

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[Jabstatt]

You need to clearly understand the difference between amps and amp hours.
Otherwise the info is meaningless!

Tony