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Solar charger and motor alternator both charging at the same time

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Solar charger and motor alternator both charging at the same time

Old 02-20-2019, 12:01 AM
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Default Solar charger and motor alternator both charging at the same time

Hi, I am thinking of adding a solar panel to charge and maintain my battery while the boat is on storage and also while underway. My question is if the solar panel charge controller can be connected to the battery for charging at the same time the motor is running and also charging the battery, is this possible or a disaster scenario?

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Old 02-20-2019, 12:21 AM
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It is fine. In the rare case that the battery is full and very little loads are on. The alt can shut itself off. Not really an issue but in some boats that means the tach stops working. Turning on a few more lights or loads normally bings it back.
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Old 02-20-2019, 03:12 AM
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Originally Posted by smac999 View Post
In the rare case that the battery is full and very little loads are on. The alt can shut itself off. Not really an issue but in some boats that means the tach stops working. Turning on a few more lights or loads normally bings it back.
fascinating.
One can always learn something new on THT.
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Old 02-20-2019, 04:07 AM
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Thanks.
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Old 02-20-2019, 06:59 AM
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Originally Posted by Fwpratt View Post
fascinating.
One can always learn something new on THT.
It is obviously a feature that is available on Canadian models.

Not sure that it is applicable to USA models.
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Old 02-20-2019, 10:03 PM
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Originally Posted by Fwpratt View Post
fascinating.
One can always learn something new on THT.
I have also seen while motoring with a generator on (charging). with full batteries. same issue.
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Old 02-21-2019, 01:23 AM
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Hello, if you use a smart solar controller, it should detect the battery is full and scale back the charging or completely stop it, the alternator should then be capable of battery charging, when the engine stops, the solar controller should kick back in when the voltage drops below the prescribed amount, hope this helps.
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Old 02-21-2019, 07:08 AM
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Originally Posted by smac999 View Post
It is fine. In the rare case that the battery is full and very little loads are on. The alt can shut itself off. Not really an issue but in some boats that means the tach stops working. Turning on a few more lights or loads normally bings it back.
Originally Posted by alloyboy View Post
It is obviously a feature that is available on Canadian models.
Not sure that it is applicable to USA models.
Originally Posted by Fwpratt View Post
fascinating.
One can always learn something new on THT.
Me think you guys so fuuuuuuuuny.

Back to reality. The only issue I can think of is some solar chargers will run the output voltage as high as about 15v. Some electronics might not like that. The only place I've seen that being an issue is with the maxxair fan used in RVs. 15v tends to cook the controller board. Lots of sailboats use solar so don't see a real problem. The engine alternator(s) won't care.
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