Re: A54 fridge circulation pump

Oliver Henrichsen, SV Vela Nautica

Hi guys,

Here is what we used:

I did reuse the flowjet pump and replaced the motor by a brushless scooter motor. These motors are very strong and got no wear parts except the ballbearings for less then 2 euros.
I mounted the motor on an L shaped 6mm aluminium and the pump from the oposite side.
The D shaped 8mm shaft is the same like the original flowjet shaft.
The motor is driven by 60% speed and works flawless while over sized. It takes less ten 1A at 24 V pushing 10 liter per min.
The motor does not get warm at all = no wasted energy, as before.
It would be possible to controll the wateroutput according to raw water temperature. I did not use this feature jet.

To drive a brushless motor, it needs a speedcontroller. I used the VESC for it, also way oversizedwhile capable to controll high currents.
We connect the 24v batterie directly to the VESC. No more using step down to 12 V wasting more energy.

The motor/pump speed is open to be controlled from 0 to 100%

€ 50,91 | ESK8 6368 BLDC outrunner bürstenlosen motor 190KV 280KV sensored sensorlose 22-48 V für elektrische balancing roller e- skateboard

D-shaped shaft 190 kv, shaft has 8mm diameter, sensored.

€ 55,36 36%OFF | FSESC 4,12 50A Basierend auf VESC 4,12 Elektro Speed Controller für Skateboard/E-roller Zubehör Flipsky

We use it now without any failing pump anymore.

Oliver from
AMEL 54#39


Sent from my Huawei Mobile

-------- Original Message --------
Subject: Re: [AmelYachtOwners] A54 fridge circulation pump
From: Sv Garulfo

Hi Oliver

We would be interested in the details of the brushless motor and motor controller as it has been the same in our case ( pump still working, only brushes wear out). 

Thanks for your help. 

Garulfo A54#122
Tuamotus, French Polynesia 

On 23 Sep 2019, at 22:16, Oliver Henrichsen, SV Vela Nautica <oliver.henrichsen@...> wrote:


We got 1 fridge and freezer in our boat, we gave the freezer in the pantry a complete refit.

1. Step is to refit AMEL freezer insulations. We removed the complete old imsulation. Sorry to say but it was poorly build in terms of condens water block, open sidecuts at the old foam boards so the foam was soaked with condens. Beside tha this foam is only max 60mm what is not enough for tropics. Because of limited space we choose most efficient isolation boards.
It needs to remove the complete freezer. The only way to do so was to enter from the top and chop the wooden boards, also soaked with water and mould. Wood is not a propper insulation for freezers.
2. Step ist to install a condenswater block membrane.
3. Step install install sandwich vacum boards. These boards got factor 5 of insulation against standard closed cell foam. So with 6cm it eaquals 20 to 24 cm foam.
4. We reused the original stainless inside case. The hole process needs extremly carefull work that there is not the tinies hole left for condens water to enter. What you get is insulated like a thermos bottle.

With this upgrade of freezer the compressor stops 24h working and with that the cooling pump. But we did not touch the fridge. With that we got on times of freezer of 2h per day and fridge of 3h per day. The new controller cares that both units will work at the same time when ever possible. Example: so the cool pump wont run first for the fridge and 5 mins later when the freezer starts it will rum again. The "intelligent"
Controler cares that operating times are bundled.
We got these operating times with 30 degrees outside temperatures.

I did not change the pump, I changed the pump motor and motor controller to brushless. My pumps never failed it was always the brushed motor and bearings that wore out.

With these steps the cooling system works efficient.

I will look for the brands i used later and post it.


Sent from my Huawei Mobile

-------- Original Message --------
Subject: Re: [AmelYachtOwners] A54 fridge circulation pump
From: Scott SV Tengah


Could you tell us more about upgrading/replacing the freezer insulation? I assume you mean the one under the settee? 

Did you scrape off all the old insulation and replace? What model vacuum boards did you use? I, too, notice that my freezer compressor is running 24h.

2007 A54 #69
SV Tengah

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