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Old 30-07-2019, 08:14   #1
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Solar Charging and RPM

Hi there can solar charging affect RPM? New 200W panels connected while running 2gm20 with hitachi 55amp alt. Sunny day and after an hour of running engine would max at 2900 rpm. Disconnected panels and after a bit I could get back to max 3400 rpm.

We are out now and I will check controller settings. So now I disconnect panels if we are running.

Can dual charging source affect RPM and if so why and how to mitigate?

Thanks!

Andy
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Old 30-07-2019, 08:21   #2
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Re: Solar Charging and RPM

If anything, solar panels charging your batteries would offload demands on the engine alternator, thus increasing power available to drive prop.
Can't even see how you could mis-wire the panels to effect anything on engine.
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Old 30-07-2019, 09:25   #3
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Re: Solar Charging and RPM

No relationship at all
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Old 30-07-2019, 09:51   #4
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Re: Solar Charging and RPM

Thanks guys the boat is new to us and there was quite a sea perhaps gunk in the fuel tank...
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Old 30-07-2019, 17:50   #5
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Re: Solar Charging and RPM

Quote:
Originally Posted by APWTryfan View Post
Thanks guys the boat is new to us and there was quite a sea perhaps gunk in the fuel tank...
Diesel engines need fuel, oxygen and compression.
Gunk in the fuel tank is really, really a good explanation for lost RPMs.
You might also check/tighten fuel fittings as it is a new boat to you - air bleeding into a diesel fuel line is never good.
Happy sailing!
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Old 31-07-2019, 08:17   #6
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Re: Solar Charging and RPM

"there was quite a sea"
Sea state alone could be the explanation.
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Old 31-07-2019, 23:00   #7
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Re: Solar Charging and RPM

You don' say what boat you have. A 20hp ne will be fine with a boat up to 10 to in habour but to motor the same boat into a 20kn breeze and 4ft chop could well need 40-50hp. If the engine was also producing some smoke that is a sure sign that it is being overloaded.
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Old 01-08-2019, 12:30   #8
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Re: Solar Charging and RPM

If your solar regulator voltage setting is higher than your alternator regulator voltage setting, then your alternator regulator would turn off the alternator at high engine speeds since the solar regulator would be charging the batteries to that higher voltage. If your tach signal coming from the engine is mis-wired at the alternator or at your keyswitch, the shutting down of the alternator may also interrupt the tach signal.

I would think this would cause the tach to go to zero rather than be stuck at a lower value.

I wonder does the engine sound like it is at the higher rpm even if the tach does not reflect it?
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