Please check my math

[jonnydot]

Bar Fridge math check please ( Hisense 120L Bar Fridge HR6BF121S) .....225kw /365 days = 0.6164kw = 2.5684931507 Amps per day ? ..................... and 2.5684931507/ 12 = 0.21404109589 Ah per day ...does not look correct to me ? Edited

 

[Supervstech]

At 240V, it would be .0025684932 Ah
At 120V it would be .0051369863 Ah,
But why are you calculating that?

 

[Supervstech]

Ok, I see the question.
You need to ignore the high voltage for the calc.
6.164Wh divided by 12V gives you 5.14Ah

 

[jonnydot]

Ok, I see the question.
You need to ignore the high voltage for the calc.
6.164Wh divided by 12V gives you 5.14Ah

Sorry I redone the maths made an error have edited the post ..Ok so it's just 0.6164kw /12

 

[jonnydot]

Ok, I see the question.
You need to ignore the high voltage for the calc.
6.164Wh divided by 12V gives you 5.14Ah

5.14Ah that is cool not much per day at all 200Ah lithium bat and 2 x 325watt cells should easily cover that usage

 

[Supervstech]

My math was bad as well...
.6164 KWh is 616.4 Wh, so 48.16 Ah at 12.8V lithium
Plus inverter loss is going to be over 50Ah

 

[jonnydot]

My math was bad as well...
.6164 KWh is 616.4 Wh, so 48.16 Ah at 12.8V lithium
Plus inverter loss is going to be over 50Ah

Bugger that's crap then lol looks like my Kombi might need a smaller fridge or gas that's a pain in the freckle lol

 

[jonnydot]

just so I get it in my head I'm looking at buying a small tv Power supply: DC12V Power consumption: 36W is it 36W / 12 =3Ah per day ?

 

[Supervstech]

just so I get it in my head I'm looking at buying a small tv Power supply: DC12V Power consumption: 36W is it 36W / 12 =3Ah per day ?

36W x hours of use =Wh per day...
so, 36Wx24H equals 864Wh
/ 12.8 equals 67.5Ah...

 

[jonnydot]

36W x hours of use =Wh per day...
so, 36Wx24H equals 864Wh
/ 12.8 equals 67.5Ah...

Gotcha many thanks

 

[Supervstech]

Watt is a consumption figure. Ya need to multiply times hours to get Wh...
Then THAT gets divided by volts of battery to get Ah of storage.

 

[Supervstech]

Watt is a consumption figure. Ya need to multiply times hours to get Wh...
Then THAT gets divided by volts of battery to get Ah of storage.

Isn’t it crazy how much energy little things we take for granted consume?

be sure to unplug things not actively being used.

 

[Ampster]

36W x hours of use =Wh per day...
so, 36Wx24H equals 864Wh
/ 12.8 equals 67.5Ah...

That assumes the refrig has to run 24/7. It may depend on ambient temperature and efficiency of refrig.

 

[wholybee]

Hint: Pay attention to the units. They tell you what math you need to do.
W x h = Wh
A x h = Ah
W / V = A
Wh / V = Ah
See the pattern?

 

[Supervstech]

That assumes the refrig has to run 24/7. It may depend on ambient temperature and efficiency of refrig.

He said tv power supply... not fridge...

 

[Ampster]

He said tv power supply... not fridge...

Sorry my bad. The thread is confusing enough without me adding to the confusion.

 

[rickst29]

WARNING: If this is "RV" or "TV" based, your power inverter must also handle the start-up amps of the compressor. What's the rated peak power on your Inverter, and what size of 12-VDC cable do you intend to use for supporting that?

Your "cheap dormitory fridge" is less than 1/4 the cost of a 12V/24V DC Compressor Fridge, but people like me pay the money. If you're dragging 'rists out to Uhuru, or Death Valley USA, thy're utterly worth it. They don't need more than 4000 watts of momentary power to get the compressor started and moving, while yours almost certainly DOES.