Mike, we have a similar set up with 2 x 110AH batteries and 150w + 30w of solar, though the 30w panel is under the boom. Your summer temperatures are a little higher than Southern England
but not much especially this year.
In addition to the Victrons I also watch the Sterling battery monitor
which normally reports 12.4 - 12.3v at dawn, certainly no lower. By early afternoon the number of AH going into the batteries has dropped to virtually nothing and the only numbers displayed probably meeting the current
usage on board. Voltage settles at 13.9v.
I did have a 60w suitcase solar panel which folded up neatly and moved around the deck
several times a day. This was really efficient because I could focus it directly at the sun. Unfortunately it slipped and one glass side smashed. The thought of broken glass on the deck
was a real concern so it went straight to a marina skip. It disappeared in an hour so hopefully someone can make use of it.
Now whilst we have lots wiggy amps in the sunshine, a couple of days of cloudy rain, not unheard of in England
, means we need to do something. So I am thinking of buying
another 100w or so solar panel, perhaps semi flexible because they are light to store below when at sea and then lift
out when anchored. This will give us the option of running a small slow cooker we have on board. I did a test earlier this year and whilst the draw is 10AH whilst warming up, once up to temperature after 30 mins, like a fridge it cycles on and off so overall much lower over say 5 hours.
The other thing you could look at is reducing the fridge usage. Extra foil and foam insulation
, always keep it full even if its only water
in bottles, we use wine
and a couple of bar beer
mats at the bottom changed every 48 hours to reduce condensation
Are there any other large loads you could work
on, LED for lights, turn the radar
off if conditions are good etc.
This is a typical picture by late afternoon.