Perhaps a new thread on solar would be better?
I’ve done solar for over 10yrs now both at an off grid cottage and on multiple boats.
-you need an “energy Budjet” meaning “how much do you use?”
Lights LED?
Fridge efficiency?
Freezer?
What other 12v draws do you have?
Charging laptop? Cell?
On and on...
Then
You don’t want to run your batteries low...
They will cycle to 60% multiple times
40% and your cutting lifespan significantly
If you need 100amp hours per day... you should have 300amp hours of batteries
Then, based on that, panel size... (and how much sun?)
If you need 100amp hours charged and 6 hours of sun... you need a big panel capable of 15+ amps
So much depends on you..and how you set your boat up and use it.
There is no definitive answer... all depends on your situation
Here is what I know works for me (others may disagree...but let’s start a solar thread, not here)
- one large panel is simpler/better than multiples
-it must...MUST be adjustable so you can angle it for maximum exposure. A small adjustable panel with out perform a much larger fixed panel!
-an MPPT controller is a must as well. So much more efficient!
-set your boat up for lower draw ei: LED everything, charge things while underway, mount your panel for maximum exposure and adjustablility.
I do not expect to be solely on solar out here. The sun is so unpredictable.
My southern sailboat is pure solar and I can be in the hook for weeks.
My solar here is a fully adjustable 165 watt panel with an MPPT controller.
See tonight’s picture.
Tipped forward
Making 6.6 amps later in the day (8+ earlier)
Batteries at 13.6
This was after coming back to the boat after my hike.
I’ve also attached a picture of the panel tipped backwards.
To me, this is critical!
While I can’t “just” have solar out here in this season, I’ll have no need to start my generator tonight or in the morning before I leave. That said, if tomorrow was cloudy, by noon I’d be starting it.
I sailed a boat for 5 seasons, never plugged in, all LED and fridge only with a 215watt panel and 4-105 amp hour gulf cart batteries
I sailed a much larger boat, never plugged in, fridge and nice size freezer, all LED with a 255 watt panel and 4-230 amp hour batteries
Hope this helps
I’d ask that responses or questions are by PM, or a solar thread started.
Thanks