Small Off Grid Solar System ... I'm Taking the Solar Plunge

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McGiever
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Post By: McGiever » Mon. Feb. 19, 2018 10:23 pm

Yup, What Larry said.


You have a modified sine-wave inverter there so it is wise to try it and find out before you need it real bad.

My suspicions are that it will be less than ideal. But, if so, that can be fixed with swapping it w/ a pure sine wave inverter.

coalnewbie
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Post By: coalnewbie » Tue. Feb. 20, 2018 6:25 am

I have been following this thread for some time.It has convinced me (again) that solar PV in the winter is less than ideal.

A have set up and used a solar hot water system in the barn for three years now. In the summer it uses a lot of hot water for washing competition horses between April and November. For DHW it was essentially useless. I am not spending the cash for a year round operation. I have been given a second unit with most of the tubes intact. So I might link them in series and try again this summer. I love no electrics to try/fry.

1.66 KWH per day average at $0.1633 a KWH. Hmmm, that is under $100 for a years effort. Now I see why cogeneration is appealing.

No MG, it's really not a suck it and see situation. My AK180 has a variable speed dist. fan and that Marathon motor is North of $300 and a modified sine wave is not a good idea for me. I suspect it is not good for any motor although some may tolerate it.
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CapeCoaler
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Post By: CapeCoaler » Tue. Feb. 20, 2018 9:15 pm

Why not go all dc...
No inverter and all the waste of one...


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lsayre
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Post By: lsayre » Wed. Feb. 21, 2018 4:40 am

CapeCoaler wrote:
Tue. Feb. 20, 2018 9:15 pm
Why not go all dc...
No inverter and all the waste of one...
That's a great idea, though it is very costly for DC appliances. Depending upon the quality and efficiency of the inverter, the energy savings should be on the order of 10% to as much as 20%. Call it 15%.

coalnewbie
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Post By: coalnewbie » Wed. Feb. 21, 2018 8:53 am

A lot of marine stuff is 24v DC. Hmmm.

CapeCoaler
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Post By: CapeCoaler » Wed. Feb. 21, 2018 8:22 pm

or you could mix a bit of ac in for TV and such...
small pure sine for those...
Motors and resistance heaters should not be too much of an issue...
There is a nice calculator on line that uses google maps to size up your building...
One of my customers could generate close to 40k per month...
They have a large warehouse...

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