Originally Posted by Fuss
3 or 4kw/hours a day means only one thing.... rip out your fridge and freezer
and replace them with a built in energy efficient installation
.... I seem to remember that Jedi posted a very good writeup on this some time ago. Just so we don't have to reinvent the wheel
I don't use that much and I have no gas, an induction double hob, a combination microwave grill
and fan oven
boiled in an electric
Forget sizing your solar for use while onboard until you have got your consumption
For maintaining the batteries using solar while off the boat you need only a single
panel and a good reliable regulator
The solar charging
parameters for this senario are very different from the solar charging parameters for an array to suppliment the diesel
generator and also the main engine
for the short runs in and out of harbour.
Well, the task I have set for my potential solar installation
specifically does not include being able to live on it without running my generator. That was all laid out in the original post.
I am quite happy with electrical
life on board and don't feel any pressing need to reduce consumption
. When you have five or six people on board a large boat with 10 or 15 phones, tablets, and laptops to charge, five or six mouths to feed, endless pots of tea and coffee to brew with an electric
kettle, and corresponding amounts of lighting
and entertainment, laundry
to do, heating
system to run, navigation
systems running 24/7, etc., etc., -- it takes a few kilowatt/hours, and I don't mind producing them with my lovely, smooth-running, almost silent Kohler genset.
The solar is just to maintain the batts when I'm not on board, and to give a little power bonus on sunny days, maybe allowing me to delay a generator run now and then when the sun is bright and power demands are light. Also to allow me to never leave the boat connected to shore power
for long periods -- I really like that idea.
And so it looks like I've narrowed it down to something like one 240 watt Panasonic/Sanyo HIT panel and a Tracer MPPT
controller. I've conceived a way to mount something like that on my davits
which I'm hoping will not add that much to the pre-existing hideousness of my davits
. The panel looks nice -- it has bypass diodes to help keep power up with partial shading, and is high voltage (43 volt maximum power voltage) to go with an MPPT
controller and a 24 volt system like mine.
I thought about whether or not to keep the Rutland wind
turbine in addition, but I think it's going on FleaBay.