You can select higher voltage solar modules, but what this means is fewer modules in series until you get the maximum sting voltage. Each string needs its own 'home run' Pos and Neg cabling to the charge controller or junction box (and after 2 strings combining in parallel, you probably need overcurrent protection on each PV Source Circuit in order to not violate the maximum series fuse rating found on the PV module datasheet). Shorter strings means more cabling cost and losses, and maybe larger junction boxes and extra fuses or breakers. However, don't worry so much about individual module voltage; Best is to do a search for low $/W modules and design with the longest series strings the controller will take. Remember the PV sting voltage does not need to match the battery nominal voltage; this is what the charge controller manages. PV string voltage can typically be up to 150Voc for example on a 48V battery system.
On Tuesday, September 20, 2016, 04:20, Arden Wiebe albert682@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:
Yeah rigged in series and then parallel. Gives some nicer numbers this way. The voltages for mine came out to 79.60 voc and 32.88 amps max for the circuit. You don't get the high amps coming in from the panels but then all else being equal does 24v nominal make much of a difference. I guess in terms of sizing the controller in some respects it did for me. I finally found the controller that would take all 2160 watts of panels in one string. Well it is not the best controller it certainly is robust. http://mwands.com/store/charge-controllers/hva-all-in-one-charge-controller-for-wind-turbine-solar-panel?filter=3
From: "bob jennings sabre281@yahoo.com [electricboats]" <electricboats@yahoogroups.com>
To: electricboats@yahoogroups.com
Sent: Saturday, September 17, 2016 3:52 PM
Subject: [Electric Boats] Re: Okay, planning my solar charging installation.
If most of our EP systems are 48 volts & we are throwing solar into the equation, why not go with 24 Volt panels in lieu of 12 volt?Bob
Posted by: matthew merfert <proteanslip@yahoo.com>
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