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Old 28-04-2016, 14:34   #1
rlg
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Leaving boat unattended with solar

Is it OK to leave a boat with panels charging when there is no load on for extended periods? Like a month? I have 300 watts and 400 amp hr agm bank on my 40 ft monohull. My mppt 20 amp charger has worked flawlessly so far.

Thanks, Rob
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Old 28-04-2016, 14:37   #2
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Re: Leaving boat unattended with solar

The MPPT charge controller should protect you from overcharging
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Old 28-04-2016, 14:38   #3
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Re: Leaving boat unattended with solar

Why not? That's the whole idea.
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Old 28-04-2016, 14:39   #4
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Re: Leaving boat unattended with solar

Works without problems for me.Even over the winter...

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Old 28-04-2016, 14:44   #5
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Re: Leaving boat unattended with solar

Worked for me with a charge controller.
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Old 28-04-2016, 16:28   #6
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Re: Leaving boat unattended with solar

We do it every day for a couple of hours. If you add up these hours it has been years.

If your worry does not let you sleep, you can apply an overvoltage off solenoid in the line before the controler.

b.
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Old 28-04-2016, 16:29   #7
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Re: Leaving boat unattended with solar

Thanks all. I thought so.
Nice to be sure.
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Old 28-04-2016, 17:55   #8
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Re: Leaving boat unattended with solar

no load--you mean to say you have no bilge pump on automatic????
nothing on at all??
not even the panel light??
nothing??
i bet you have something that uses electricity that you donot realize .....
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Old 28-04-2016, 18:07   #9
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Re: Leaving boat unattended with solar

The automatic bilge is on, nothing else. My boat doesnt leak so I cant see that draw mattering at all.
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Old 28-04-2016, 18:09   #10
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Re: Leaving boat unattended with solar

Quote:
Originally Posted by zeehag View Post

(...)

I bet you have something that uses electricity that you do not realize ...

(...)

HA HA HA !!! I am in Canary Islands and I owe you a beer. I think it is not the first one. You should sail in!

like some mppt THE SOLAR REGULATORS do ... yr battery monitor another often overlooked suspect ... fire alarm ... entry alarm ... battery fans ... battery "equalizing" device ...

Love,
b.
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Old 28-04-2016, 18:16   #11
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Re: Leaving boat unattended with solar

even automaticity of bilge pumps uses electricity.

barny whenye coming to mexico?? i got a lotta work to do on my pooooor birdeeee.....
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Old 28-04-2016, 19:13   #12
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Re: Leaving boat unattended with solar

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The automatic bilge is on, nothing else. My boat doesnt leak so I cant see that draw mattering at all.
Hmmm...guess it's not appropriate to mention S happens?

Good luck, it'll work just fine. In fact, Maine Sail has been recommending for years that folks on moorings (i.e., not docks) use solar to assure their expensive batteries stay charged. Undercharging is sure death.

Think anyone listens?

All the best.
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Old 29-04-2016, 08:20   #13
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Re: Leaving boat unattended with solar

I think it is always good to make sure all the wiring etc are ok before u leave for an extended time. Else u may find a dead battery when u return (worse if the bilge pump is out of action).
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Old 29-04-2016, 08:29   #14
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Re: Leaving boat unattended with solar

Do make sure that you have a fuse in the line from the solars to the battery. At the output from the MPPT is probably the best place.
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Old 29-04-2016, 08:44   #15
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Re: Leaving boat unattended with solar

Do it all the time....with over 1000 watts.
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