Setting up a 24v solar charging system - Page 2 - SailNet Community
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post #11 of 12 Old 08-16-2014
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Re: Setting up a 24v solar charging system

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Originally Posted by Minnesail View Post
Would there be an experimental way to find out? I suppose I could deliberately shade one panel and see how fast it charges.
A battery monitor (or even just an amp meter) will do the job and give you a good idea of how much charging you are getting out of the system.

On my 30w panel if I shade one cell in bright sunlight the charging drops from over 2 amps to under 1 amp. If I shade two cells my amperage falls so low as to be nearly useless. This is with a Genasun MPPT.

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post #12 of 12 Old 08-18-2014
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Re: Setting up a 24v solar charging system

Re 24 volt solar panels. In my area a 24 volt panel is about half the price per watt of a 12 volt panel -so you would be better off with a 24 volt panel for two reasons - cost per watt and you won't be needing to change voltage through a voltage converter which uses a fair bit of power. (Really noticeable on a low power system - which yours is considered.)

Re panels in the shade of the boom (or anything else) - US solar make a panel that uses older technology and results in a large panel for the output compared to the newer ones BUT IT WORKS BETTER THAN THE NEWER ONES when partially shaded and on cloudy, low light days. (I use these at home and on the boat - 64 watt on the boat, much more at home.)

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