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Forum: Electrical: Batteries, Generators & Solar

19-09-2017, 07:56

Replies: 93

Solar, off grid and heat problem

Views: 9,187

Posted By Paul Elliott

Re: Solar, off grid and heat problem

There are numerous MPPT controllers that are designed to work with "12V" panels. I just installed three of these on my boat:...

Forum: Electrical: Batteries, Generators & Solar

18-09-2017, 23:00

Replies: 93

Solar, off grid and heat problem

Views: 9,187

Posted By Paul Elliott

Re: Solar, off grid and heat problem

Is 30V a typo? Perhaps it should be 20V?

30V x 8A = 240W
20V x 8A = 160W

If that is actually 20V open-circuit, and 8A is the short-circuit current (this is often the way panels are spec'd,...

Forum: Electrical: Batteries, Generators & Solar

18-09-2017, 19:44

Replies: 93

Solar, off grid and heat problem

Views: 9,187

Posted By Paul Elliott

Re: Solar, off grid and heat problem

You are almost certainly reading that wrong.

I wouldn't worry about that though. An appropriate monocrystalline panel will deliver all the power that the available sunlight will generate, unless...

Forum: Electrical: Batteries, Generators & Solar

18-09-2017, 13:34

Replies: 93

Solar, off grid and heat problem

Views: 9,187

Posted By Paul Elliott

Re: Solar, off grid and heat problem

I would be interested in the details for that shade-tolerant panel. I suspect that it has the typical bypass diode arrangement, which with a single panel won't make much difference in the shading...

Forum: Electrical: Batteries, Generators & Solar

17-09-2017, 14:43

Replies: 93

Solar, off grid and heat problem

Views: 9,187

Posted By Paul Elliott

Re: Solar, off grid and heat problem

Oops, I meant to use a 50% battery discharge limit, but forgot to divide by two. We only get two weeks of total darkness holdover. This should still be fine, and even in heavy cloud cover we do get...

Forum: Electrical: Batteries, Generators & Solar

17-09-2017, 13:56

Replies: 93

Solar, off grid and heat problem

Views: 9,187

Posted By Paul Elliott

Re: Solar, off grid and heat problem

Agreed on the low heater run-time. Probably an hour or two total run-time would be sufficient, and a thermostat set appropriately low would do the trick. So, figure a 10% duty-cycle, for a current...

Forum: Electrical: Batteries, Generators & Solar

17-09-2017, 11:14

Replies: 93

Solar, off grid and heat problem

Views: 9,187

Posted By Paul Elliott

Re: Solar, off grid and heat problem

Here's my math on that:

Espar Airtronic D4 runs low-power at 0.6A, burns 0.02 gallons/hour.
This = 14.4 Ah/day at 100% duty cycle.

Location? Vancouver WA? Latitude = 50 degrees N.
Earth...

Forum: Electrical: Batteries, Generators & Solar

15-09-2017, 09:59

Replies: 93

Solar, off grid and heat problem

Views: 9,187

Posted By Paul Elliott

Re: Solar, off grid and heat problem

I think you need air circulation inside the cabin to ensure this. I have a small powerboat in Friday Harbor, and before I started using a space heater (and shorepower) in the winter, it did get cold...

Forum: Electrical: Batteries, Generators & Solar

14-09-2017, 22:40

Replies: 93

Solar, off grid and heat problem

Views: 9,187

Posted By Paul Elliott

Re: Solar, off grid and heat problem

The problem with this is that the solar panel only puts out its wattage when the sun is shining. We typically assume that you will get five hours worth of rated output, and this includes the lower...

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