Posted by jdemaris on December 12, 2009 at 14:50:57 from (67.142.130.19):
In Reply to: Solar battery tender posted by GeneMO on December 12, 2009 at 13:36:19:
Depends on the size of the solar unit and the size of your battery or batteries. With a good sized diesel battery in a tractor or two in parallel, you need a good 1/4 amp capacity to be of any use. 1/4 amp at 14 volts is 3 1/2 watts. It takes a 5-10 watt panel to provide you that 3 1/2 watts unless you live in a very high sun area. My point being, if you've got a big battery, a solar charger smaller then 5 watts is usually a waste of time and money. A 1/4 amp that only appears maybe 4 hours a day max, and only on days with good sun is not much.
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