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Old 19-02-2015, 20:00   #31
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Re: Run water heater from inverter?

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Originally Posted by twinboat View Post
Here is the math, 3 X 200 watt panels = 600 watt / 13.5 charging voltage = 44 amps.

About 5.5 hours a day = 242 ah per day.

Nice system, I have about the same and get the same kind of output.

It`s just math
Yes, it is just maths. But then there is 'practical maths'. I have two 120w panels so I should in theory get close to 18amps. But in reality I commonly see between 8 to 10 on a good day when I'm sitting on a mooring or at anchor. Most of the time it seems to be feeding around 6 or 7amps. I can keep an eye on it with my Stecca controller I have.

But, I confess, I'm more than a novice when it comes to electrical stuff.
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Old 19-02-2015, 20:32   #32
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Re: Run water heater from inverter?

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Originally Posted by Rustic Charm View Post
Yes, it is just maths. But then there is 'practical maths'. I have two 120w panels so I should in theory get close to 18amps. But in reality I commonly see between 8 to 10 on a good day when I'm sitting on a mooring or at anchor. Most of the time it seems to be feeding around 6 or 7amps. I can keep an eye on it with my Stecca controller I have.

But, I confess, I'm more than a novice when it comes to electrical stuff.


May be worth checking your solar wiring size. If the panels are aged there may be dead cells. Wipe Click image for larger version

Name:	ImageUploadedByCruisers Sailing Forum1424403160.735958.jpg
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ID:	97465any dust off the panels and see if you have anything shadowing the panels, e.g. Rigging, radar or flags.

With the all the rain in Tassie though...dust on panels shouldn't be an issue!!


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Old 19-02-2015, 20:46   #33
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Re: Run water heater from inverter?

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Originally Posted by Amnesia II View Post
May be worth checking your solar wiring size. If the panels are aged there may be dead cells. Wipe Attachment 97465any dust off the panels and see if you have anything shadowing the panels, e.g. Rigging, radar or flags.

With the all the rain in Tassie though...dust on panels shouldn't be an issue!!


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My panels are less than six months old. I had a Auto Sparky check them out and found the controller was faulty, but that's been replaced and now they are working perfectly.

I'm not sure what you mean by all the rain in Tassie? Even on the West Coast of Tassie it only rains once a year (Feb to Nov). I see your located here at the minute, where are you in Tassie?
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Old 19-02-2015, 23:29   #34
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Re: Run water heater from inverter?

Boat currently in POW Marina, while I'm over in WA for family. I seem to remember lots of rain in Jan, not long before the Wooden Boat Festival.

Love Tassie...favourite hangout spot...FranklinClick image for larger version

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Old 19-02-2015, 23:45   #35
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Re: Run water heater from inverter?

I can, but usually rely on the engine's exchange heat. Having no genset, electricity is precious. (Thankfully, by choice, kitchen isn't electric.)
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