300 watts flat on the roof. Clean, no shadows on panels, 65F. 12v system. Today in Quartzsite, what's a reasonable expectation of amps in BULK charging, at 1 PM? I was only seeing 11.x amps at just under 14v. That seemed low. But so is the sun.I'm just getting to know my new system. Right now it looks like it might get me up to 14.4 or so by the time the sun peters out.

Which panels, which charge controller? Low long of what gauge wires?

~11, flat panel irraradiance in tuson got to ~700 todayhttps://www.nrel.gov/midc/ua_oasis/display/300 watts / 18v yields 16.6A panels16.6 * 700/1000 = 11.6A

You should see 18-20 with perpendicular sun. Tilt them.11 sounds reasonable for your flat panels.

The altitude is pretty low. The extra atmosphere will block a lot of sunlight. Test this up at 4,000 foot elevation in Boulevard CA, and you will see a lot more amperage. There is a casino up there, but not sure about any campgrounds or dry camping areas.Congress is another area near you where you can test at low elevation, then climb the mountain about 8 miles to the north, and gain about 2,500' elevation. There is a Escapee's RV park in Congress. At the top of the hill, there is probably over 4" of snow this time of year. Fred.

679w on my roof flat. Rice ranch "Q", pointed east west, broadside to the southern sunsome shading on some panels from A/C units depending on sun positioni hit 19+ amps todayyour 11amps sounds good for 300w of panels

Flat solar panel performance today in Quartzsite

44 Replies

Golden_HVAC
Explorer
Jan 21, 2016
The altitude is pretty low. The extra atmosphere will block a lot of sunlight. Test this up at 4,000 foot elevation in Boulevard CA, and you will see a lot more amperage. There is a casino up there, but not sure about any campgrounds or dry camping areas.

Congress is another area near you where you can test at low elevation, then climb the mountain about 8 miles to the north, and gain about 2,500' elevation.

There is a Escapee's RV park in Congress. At the top of the hill, there is probably over 4" of snow this time of year.

Fred.
2oldman
Explorer II
Jan 21, 2016
You should see 18-20 with perpendicular sun. Tilt them.

11 sounds reasonable for your flat panels.
red31
Explorer
Jan 20, 2016
~11, flat panel irraradiance in tuson got to ~700 today
https://www.nrel.gov/midc/ua_oasis/display/

300 watts / 18v yields 16.6A panels
16.6 * 700/1000 = 11.6A
christopherglen
Explorer
Jan 20, 2016
Which panels, which charge controller? Low long of what gauge wires?

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Flat solar panel performance today in Quartzsite

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