12 V DC Chiller Build

[Rob White]

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250Amp battery is 1Amp for 250 hours, 250 Amp for 1 hours or any combination in-between.

A quick calculation with 3.5 kW load would require 1 kW input so your battery would last about 3 hours......
If my maths is correct??? :D

Rob

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[yilmaz22@gmx.de]

Yes your right Maths is good.

Rob what can i do.

Spal Fan 8 A per Hour 2 Fans 16A per Hour what a Kompressor can i use Danfoss Bd250 12 V ?

[Brian_UK]

Just need to ask - is the 250amps the battery capacity or its CCA cold cranking amperage (to start and engine)?

According to the bd250 data sheet it should be around 7-8amps at -15°C, see page 22 -
https://www.google.co.uk/url?sa=t&source=web&rct=j&url=http://files.danfoss.com/TechnicalInfo/Dila/06/bd_compressors_04-2007_pk100c802.pdf&ved=2ahUKEwj895b4j4LfAhUEDuwKHeI5BogQFjAAegQIAhAB&usg=AOvVaw1Ma2tE3Tor81YW7-fYMqJe

[yilmaz22@gmx.de]

Hello Brian

The Battery is 12V 200Ah Deep Cycle 800A/EN sorry fro my bad English.

thanks for helping ,i see to page 22 max Ampere 4400 rpm 19,18Amps per hour

20A+16A=36A (16 A 2 x Spal Fan)
200A:36A=5,5 Hours of running ?

[Brian_UK]

Agreed 19amps at maximum load.

This load will reduce as the refrigerant load is pulled down towards your design temperature. Once at temperature the compressor operation will be further reduced as it comes under thermostat control.

[Rob White]

Yes your right Maths is good.

Rob what can i do.

Spal Fan 8 A per Hour 2 Fans 16A per Hour what a Kompressor can i use Danfoss Bd250 12 V ?

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Brian has a good point. as the load is achieved it will reduce the demand on the battery
but it might only get you and extra 1/2 hour. Is it not as simple as getting another battery
and doubling your supply?

It will be hard to reduce power drawn due to the motors and other components design
there is no easy way to reduce demand but you can double capacity of battery and that
might be enough?

Regards
Rob

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[yilmaz22@gmx.de]

Thanks Guys

i will inform you in some days i start build this unit .

best thanks .

i wait your Ideas

[frank]

All well and good...but you should not drain a battery below 80% capacity.

How is the battery recharged to continue the refrigeration cycle once down to temperature?

[yilmaz22@gmx.de]

Hello Frank
the unit charged only with 240V,the Refrgeration runs 5-7 Hours from the battery(i Hope)
and chardged after the work .


best thanks Guys