Fridge power supply and protection.

TSB240

TSB240

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I am hoping to wire up my waeco fridge conversion this weekend.

Installation manual has no guidance for circuit protection of any detail.

I am using the waeco coolpower eps100 which is a mains priority PSU which takes a feed from the house battery and either feeds 12 volts to the compressor
when disconnected from the mains or 24 volts when connected.
Max rating is 10amp.

I have a choice of 6mm2 and 10mm2 trirated cable relatively short run from house battery to PSU <1m and a similar length from PSU to Compressor.

I am thinking of fitting a either a 10 amp or a 16 amp MCB(thermal trip)

http://uk.rs-online.com/web/p/mcbs/7913473/

This is single pole and would only be in the positive feed from the battery to the PSU to protect that cable D rated as I suspect the inrush will be quite high.

Any comments about additional protection in the circuit downstream of the PSU would be welcome? Also considering two pole MCBs
 
TSB240 said:
I am using the waeco coolpower eps100 which is a mains priority PSU which takes a feed from the house battery and either feeds 12 volts to the compressor
when disconnected from the mains or 24 volts when connected.
Max rating is 10amp.
Click to expand...

Do I understand you correctly that this compressor can work at either 12v or 24v? (and presumably works 'better' when 24v is available when on mains power?).
 
TSB240 said:
I am hoping to wire up my waeco fridge conversion this weekend.

Installation manual has no guidance for circuit protection of any detail.

I am using the waeco coolpower eps100 which is a mains priority PSU which takes a feed from the house battery and either feeds 12 volts to the compressor
when disconnected from the mains or 24 volts when connected.
Max rating is 10amp.

I have a choice of 6mm2 and 10mm2 trirated cable relatively short run from house battery to PSU <1m and a similar length from PSU to Compressor.

I am thinking of fitting a either a 10 amp or a 16 amp MCB(thermal trip)

http://uk.rs-online.com/web/p/mcbs/7913473/

This is single pole and would only be in the positive feed from the battery to the PSU to protect that cable D rated as I suspect the inrush will be quite high.

Any comments about additional protection in the circuit downstream of the PSU would be welcome? Also considering two pole MCBs
Click to expand...

Hi

I have a Waeco CRP 40 fridge which I control through a Waeco MPS 35 controller, the controller is wired back to the battery which is about 2m away and has an inline fuse fitted just after the battery as recommended in the handbook.

The controller is wall mounted next to the fridge.

The 230v from the controller is wired to a nearby 3 pin wall mounted plug which in turn is part of the boats ring main which is wired back to a PCB.

As I 'sail' only 90% of the time I switch the engine on about every 3 hrs for about 15 min, I have to say I am very pleased with my Waeco fridge as it is almost silent when running and uses very little electric, my only criticism is there is no marking on the fridge control switch, but have found to turn it to just over halve way is about right.

Mike

To date all works fine
 
I would use the 6mm2 for a short run - good for at least 3 or 4 times that current, and over a short run PD loss will be minimal, with 16a MCB, up to you whether you use 1 or 2 pole. If you use a 10a MCB then you risk tripping at max draw amps, and MCBs weaken and trip early if they operate close to rating and certainly if they keep tripping.

There is a brand called Chint which is good value on Ebay and excellent quality, despite getting a slating because they are cheap and chinese. We use Chint products extensively for industrial air conditioning applications that we have to warranty.
 
I don't know if anybody is still monitoring this topic? I am also wiring in an EPS 100 to a Waeco fridge. The instruction manual is poor. Can anyone tell me what the B+,B-,C+ and C- connections are for? I want to run the fridge from 240V when in port and 12V when at anchor.
 
Rikds said:
I don't know if anybody is still monitoring this topic? I am also wiring in an EPS 100 to a Waeco fridge. The instruction manual is poor. Can anyone tell me what the B+,B-,C+ and C- connections are for? I want to run the fridge from 240V when in port and 12V when at anchor.
Click to expand...
From the manual .... Seems clear enough to me. What dont you understand ?


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