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Rick H Parker

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Reply with quote  #11 
B. The pump will cycle on and off.

He has already stated his plan is continuous flow and that does make sense for aquaponics.

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist

stmbtwle

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Reply with quote  #12 
Missed that.

A smaller pump might help, IF it can provide the required volume. How much water is required per day and what is the rating of the pump?

12 hours of "daylight" does not equal 12 hours of full sun. Production is less during morning and evening, and then there are clouds. Use the software.

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Willie, Tampa Bay
MattEDP

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Reply with quote  #13 
The pump needs to run continuously to cycle the water for the aquaponics setup.  Essentially there's a tank of fish and the pump will move the water from the fish tank to irrigate elevated plant beds nearby.  The water in the plant beds (filled with gravel) will then drain back into the fish tank aerating the water.

It's a closed system (with water loss due to evaporation), but if the pump ever fails, then the plant beds run dry, killing the plants and the benificial bacteria in the gravel.
Rick H Parker

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Reply with quote  #14 
12 hours of "daylight" does not equal 12 hours of full sun.

A sun-hour is 1000 W /m2 of Solar Irradiance for one hour. 
1000 W /m2 is the global average. His being that close to the equator, his average would be higher .. more solar Solar Irradiance at the surface because, the sunlight pass thru less atmosphere.
12 sun-hours in 12 hours is not an unreasonable assumption for his location.

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
stmbtwle

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Reply with quote  #15 
Unless, of course, it's cloudy. Or humid.

OR the sun is hitting the PV panels at an oblique angle as in the morning and evening. Etc.

You can use any assumption you like, I'll stick with the data.

Accra gets, on average, 5.20 kwh/sq meter/day.
A 250w panel will produce about 1 kwh/day after losses.
A 2-axis tracking system will produce about 1.13 kwh/day.

http://pvwatts.nrel.gov/pvwatts.php
https://weather-and-climate.com/average-monthly-hours-Sunshine,Accra,Ghana

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Willie, Tampa Bay
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