Vincent Chow's posts

Hmm, John....thanks again.

Can you help answer my Q2 on how many days my model will continue working on cloudy days?


Thanks a zillions

vincent
4x4 and Solar

John,

Thanks for yr reply. I sorta understand but still not postively sure. Are the 10A x 12V specifications of the inverter?

If you have some time to spare, can you help answer the example which I quoted earlier to help me understand.

If this is taking too much space and airtime on Alt-E site, you can perhaps send reply to my email: kmv_chow @ yahoo.co.uk
Cheers!

Vincent
4x4 and Solar

Hi John,

Good day. I have further queries on the below calculation I hope you and other members can help enlighten please (despite being a old post).

First: How did you work out that the inverter will draw just under 10A to power the 75W load?

Is it from the inverter specification (if so, from a manufacturer leaflet, what wud this figure be termed as)

OR is this based on the 10A controller? If so, does it mean a 20A will draw 20A to power....

To concrete my understanding. Pls help verify below:

I have one 80W panel- assuming 5hr daily avg. sunshine = 400wh.
I have a 100Ah deep cycle battery, with 300W inverter and 10A controller. On the load side, I have 2x10W energy saving bulb to run for 5hr each and a 1x50W table fan for 3hr (total= 250Wh)

Q1) Since supply > load demand, is the system ok?
Q2) assuming 50% discharge cycle, how do I work out many day it will continue to work on cloudy day?

A million thanks

Chris,

Thanks alot as usual. I will get the book as recommended.

Now working backward, if I need to have a solar system that is 200KW, can you help me with a ballpark analysis on the system components cost and quantity i.e. panel, inverter, controller, batteries. Or run thru the step of determining the system.

Will I be able to use the on or off-grid calculator as a rough guide?

As for yr video on the beer n electricity, du end up drinking by the bar w/o turning on the camera..haahaa..just kidding..

Cheers! Vince

[The 400KW Singleton solar farm produces enough electricity produces 550,000 kilowatt hours of electricity which is used to supply public demand]

How does the 400KW relates to the 550,000KWH?

And where can I learn how to size to solar farm from book or online? I tried the on-grid calculator but it seems more simplified than the off-grid.

Many thanks in advance.


 

Chris,

Thanks a million for the concise answer. It sures solve the mystery for me.

I assume you aim to reduce the # of parallel connections- is there any particular reason for this? or simply cost economics?

Once again, many thanks.
Vincent

Chris,
Thanks a million for the concise answer. It sures solve the mystery for me.

In step 1-

Good day.

I was using the alt-energy online calculator to size up a system which I am hoping to build.

I worked out the total wattage of solar panel = 7875. So far so good. However, when I come to sizing the battery bank, can someone help explain the rationale behind the calc for # of days of backup power and lowest temp of battery bank.

Right now, I inputted 3 days of back-up with 90 degree temp and I get battery bank of size 3703amp hrs at 12V.

If I unputted 5 days with 90 degree, 6171amp hrs, pls HELP!! Thanks in advance.