Re: [Amel] Re: Power generators

Ann-Sofie Svanberg <kanalmamman@...>

Hi Kent,
we have done the following to the fridge/freezer functionality on our SM #232:
- We have changed the original air cold Frigoboat compressors to water cold. The water is taken from our fresh water tank and circulated by a pump linked to the compressor. We have one pump for our two compressors, Frigoboat W35F and W50F, connected to the same pump interface. This solution has been in use for the last 3 years and our power consumption has decreased with more than 30%. The temperature in the water tank is increased by maybe 0.5-1.0 degree Celcius not more. We have spare circulation pumps and pump interface if those units will stop function. The reason for this solution is that we will not suffer from any type of growth or other disturbances of the circulation pump, the water out side will keep the water tank temperature levelled so from our point of view it was a win-win situation.

- Regarding the boxes we have so far removed the insulation completely on our forward box, used as a freezer, and insulated it with Polyurethane insulation with 220 mm in the bottom and between 50-130mm on the sides. This has made our compressor to run less than 15 minutes per hour producing minus 18 degrees Celcius on the warmest spot close to the top to the centre of the boat. To remove and put the new insulation in place we took out the box and disconnected the compressor and did the work out side the boat. To remove the original foam insulation is easy.New insulation will be done on the aft fridge/freeze within a couple of weeks. We will also consider to re-do the insulation on the fridge in the kitchen. Pictures on the cockpit roof and the change of insulation can be find in the album Lady Annila.

- Power when sailing, you are correct that the solar panels at present does not cover the total power consumption but due to the low consumption by the water based compressors, a well balanced sail configuration and optimisation of the Autopilots sensitivity you could come to a very low average consumption per hour. For us this mean power consumption less than an average of 4-6 A/hour, if the Sun conditions are good this could be a plus of 2-3 A/hour. We have an average input of around 8 A/hour during a day with maximum input of 11 A in good conditions. We have a net input in the system when on anchor. We are presently looking at adding a Windgenerator to provide additional power during the dark hours, provided that the wind direction supports this, and added power during the day time.

We are satisfied with our solution but are working continuously with lowering our power consumption.

I hope this answers your questions.

Fair winds,

Ann-Sofie and Jonas
S/Y Lady Annila
SM #232

To: amelyachtowners@...
From: karkauai@...
Date: Sat, 26 Jan 2013 09:17:21 -0500
Subject: Re: [Amel] Re: Power generators

Hi Ann-Sofi,

I'm interested in your switch to fresh water cooling of your fridge freezers and improved insulation. Why the switch to fresh water cooling and how is that set up? Separate supply tank? Separate water pump? Heat exchanger to cool the water? Did you change the boxes or add insulation?

No question that the fridges are the biggest power users. A 460w solar panel doesn't seem like it would power the fridges and autopilot. Do you have a wind vane and/or shaft alternator?



SM 243

On Jan 26, 2013, at 3:42 AM, Ann-Sofie Svanberg kanalmamman@...> wrote:

We have changed our bimini to a fixed roof over the cockpit. On that roof we have mounted 24v solar panel 460 W. Our battery bank includes 8 golfcart batteries providing 520 Ah.
We have changed all lamps to LED, we have changed the compressors to fridge/freeze to fresh water cooling and changed the insulation on them aswell. Which was of big importans for the overall consumption profile
During day time (sailing) we are usually power neutral. Meaning we only have to start the diesel generator for washing or making water.
Our plans is to install a wind generator for additional power during night and cloudy days.
We think that it is better to use the diesel for making speed than making power. So for us, yes it is worth it.
Ann-Sofi & Jonas
Lady Annila, SM 232
Skickat från min iPad
26 jan 2013 kl. 02:47 skrev "sharki41" hannamj@...>:
We are intending to do extensive cruising. Staying out of marina's, and primarily living "On the Hook". We have AGM batteries. Filling the battery bank to 80-85% with a genset or hi capacity engine driven alternator is fairly efficient. The last part of the charge up to 100% is not efficient. (Could be many hrs of genset operation at low load to charge up to 100%). For this reasion we will probably install solar panels. AGM's in particular need to be periodically charged to 100% . Also, ask your battery manufacturer what voltage their particular batteries should be charged at. Charging, no matter what the source, at too low a voltage is inefficient, and at too high a voltage is damaging.
Thank You All for the wonderful Amel information. We loved the Joel Potter movie last night.
Fair Winds,
Mark and Joanna
--- In amelyachtowners@..., Attilio Su Yahoo wrote:
What my friend Paolo Liberati says is: use all possible system to have power. I.e. it is not a matter of cost benefit balance, when you are on passage, it is a matter of power needs in case of gen set failure. Solar panels never fail, and also windgen. I have sol pan plus wind gen and up to now (in the Med anyhow) now need of diesel genset. Craig with a Santorin and genset says that if you are not too power hungry (led lights etc) you can more safely survive without genset, or with a cheap portable Honda genset for emergencies only and solar panel - at least 2 x 90W - and one wind gen on top of mizzen mast, In total about 1500 euros
Attilio e Maria Amel Santorin #84 Sisila
Inviato da iPad
Il giorno 25/gen/2013, alle ore 15:31, Alessandro Gennai ha scritto:
Hi firends,
I need your opinion concerning power generator (solar panels , wind generator, water generator) on amel supermaramu 2k; as we know she is a power consuming boat but it is worth to spend money for this kind power generator when we have to use generator for water maker, washer machine and more? In case which of these kind of power generators are more suitable for this boat? One story: during ocean passage I had to turn on generator 3h x2/day, a friend of mine with 2 panels and 1 wind generator has to turn on it 2h x2/ it worth????
Thanks for your help
amel supermaramu 2k #443
Inviato da iPad di Alessandro Gennai

[Non-text portions of this message have been removed]

Join to automatically receive all group messages.