Originally Posted by poiu
It is perfectly possible and is actually on my job list, item 102. In the Caribbean
I haven't found it absolutely necessary, even in Summer. Greece
in August can get horrid hot and I know where you are coming from. You can minimise start up current
problems with a soft starter on the air con compressor
- I bought one, but not fitted it yet. You can improve efficiency by running a DC water
pump, ideally one per compressor
or an AC pump on an inverter
. The pumps are power pigs and need to be in your calcs.
To do this routinely, say every night at anchor
for only an hour you only need 80A on your figures, which seem ok to work with. That's not so much. About 1.5m2 of good solar panels
could do it. 1.5m2 x 18% efficiency x 1000W/m2. /12v x 4.5 hr charge per day =101A output. If you want to do this more than an hour then get a genset.
Your figures are in keeping with my thoughts. Fans have just been fitted and we are looking at a solar
panel fit next week.
We only aim to run the AC on a minimal basis. As you correctly point out Greece
in mid-summer can be overwhelming and if you can close the boat up and just knock the sting out of the cabin
temp it makes a night of sleep possible.
I had hoped to fit the new style of solar panels
that heat water
as well as generate electricity. Apperently keeping the panels
cool makes them more efficient and this new design does just that. I spoke to one manufacturer suggesting that he makes a marine
unit but he thought the market too small even though there are tens of thousands of boats worldwide sitting in the sun that would prefer not to run an engine
just to top up batteries and heat the water.
Going off topic and back to the Prius. The latest PIP version will do up 14 miles and 59mph before resorting to hybrid mode. I regularly do a 13 mile trip door to door in electric
only. I can't get back without using the petrol hybrid side of things because charging
points are too few and far between in public car parks. It is a totally different machine to my first Prius and great to see how this technlogy is coming along in leaps and bounds but will it ever trickle down to boats?
Alas, unless you are in the super yacht bracket getting any setup remotely out of the accepted rut is almost imposible.