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Posted by yan on June 6, 2018, 12:59 am
Dear All,

Can anyone update me on latest home solar system technology?

I appreciate anyone inputs.


Posted by Jim Wilkins on June 8, 2018, 2:34 pm

SolarCity placed a separate MPPT controller on each panel and networks  
them all together.


Posted by Jim Wilkins on June 15, 2018, 11:25 am


Posted by ads on June 17, 2018, 6:03 pm

Do you want grid-tied solar that augments what the power compoany
provides but goes away when the grid is down or do you want
independent solar power that works when the power company doesn't?

A few grid-tied systems can be converted to off-graid but you'll
probably be better off with a designed to fit off-grid system.  They
are NOT cheap.  

By doing a lot of scrounging and bargain hunting, I put together a
small system that can best be described as a "solar generator".  The
battery bank is charged by solar panels with a couple of gasoline
generator options if there is no sun.  

In 10+ years at this location, the longest outage was 16 hours.
Depending on the season, I can get 10 to 20 hours or "Wait until
daylight" power from the system.  If commercial power was off for an
extended period(weeks), we would have enough power to drop back to a 4
cu ft fridge, 7" TV and charging laptops, tablets and cell phones (if
cell service is up).  The total cost was $100 for 900 watts or solar
panels, two MPPT charge controllers, two 2000 watt sine wave (PSW)
inverters, a 500 watt PSW inverter, a 12 volt 540AH battery bank and
lots of wire, fuses, circuit breakers, metering, etc,  

For a larger system, you'd want a 48 volt battery bank.  I went with
12 volts because of the number of 12 volt lights and other accesories
available - such as the 12 volt DC-DC converter that runs and charges
the laptop.  With that converter providing power, the laptop idles at
15 watts.  Using an inverter and the usual AC power supply/charger,
the idle power for the laptop  is 35 watts.

Note that there's no mention of washing machine, clothes dryer,
dishwasher, air conditionibng or any of a number of modern
"necessities".  If you want those items, you will need a solar system
that's at least 10  times the size of my backup power.  

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Posted by Jim Wilkins on June 17, 2018, 8:02 pm
 <ads> wrote in message  

My solar backup system assumes I'll start a generator for the  
intermittent large loads you mentioned plus the microwave, so it's  
sized for the 120VAC refrigerator and 12VDC freezer which run 24/7. My  
largest "3750W" generator can only start the old Maytag if I nudge the  
motor inward with my foot to slip the belt. I dry laundry on a  

What did you choose for MPPT controllers and how do you like them?

It puzzles me that they are still so expensive when this has a better  
display and all their functionality except for tracking software for a  
much lower price.

I have the older DPS5015 which is easy to adjust for maximum current  
to the battery. The smaller text at the bottom is input voltage which  
shows the array's Maximum Power Point voltage and when it has been  
overloaded and trapped in a low voltage state. Then the battery  
current must be briefly reduced or shut off to allow the panel voltage  
to recover.


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