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Old 03-07-2018, 04:06 PM   #14
djmarchand's Avatar
City: Litchfield, Ct/Punta Gorda, Fl
Country: USA
Vessel Model: Atlas Pompano 23
Join Date: Aug 2012
Posts: 4,881
I would never install an undersized solar controller. Sure it might reach 50 amps only 1% of the time, but each time you do you are over heating the electronics and overheated electronics don't last long.

Consider midday sun directly overhead with your batteries well discharged so that it only takes 12V to charge at 50+ amps. That controller will put out 730/12 less 5% efficiency losses = 58 amps. That 50+ amp rate won't last lon. The sun will move reducing the solar output and the battery voltage will rise as it charges reducing the amps.

But any over current in my book is too much.

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