I have very similar (consistent) results, even though I am much further north
I have a 24 W panel and I get a maximum charging current around 1.1 -1.3 A. My
maximum charge per day is much less, but my batteries are never that empty. I
think that the maximum I ever saw was just under 10 Wh in a day. This is
certainly enough to keep the batteries healthy.
My solar panel is a flexible one that I put on the bimini. There is always some
shading (a least, the backstay), so the efficinecy is not the best.
This is with an older model of Morningstar, but it has a digital charge
monitor, so it tells you what is (and was) going on with the solar charging.
If you use refrigeration or generally, have big power budget and big batteries,
you need much more solar power (150 W or more).
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Josh Muckley
Sent: Saturday, September 17, 2016 14:02
To: C&C List <email@example.com>
Cc: Josh Muckley <muckl...@gmail.com>
Subject: Re: Stus-List Solar panels
Genasun is pretty much the agreed best engineered MPPT controller though they
don't do higher current. They have varying options for battery chemistry and
wattage. If genasun is what you use then you'll basically have to plan on one
controller per panel which is great for reliability and redundancy but may not
be so good on your pocket book. They also don't have digital volt/amp/watt
outputs so you'll probably want to look at getting one. Genasun also offers a
boost feature which allows a solar panel that outputs less than the battery
voltage to charge the battery. Otherwise you'll have to ensure the panel
voltage is greater than battery voltage and they won't start/stay charging in
the morning or in the evening.
Just to talk numbers for a minute. My experience is that a 100 watt
monocrystaline flexible panel mounted horizontally at a geographic latitude of
38° yields a max of 66 watts in the peek summer sun. I get about 4 or 5 amps
peek charge current but only at peek sun. IIRC I get a cumulative ~900
watt-hours per day.
S/V Sea Hawk
1989 C&C 37+
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