I am assisting, as a volunteer, with a solar feasibility study design and budget pricing for a small hospital in Uganda. Would anyone please review the factors and assumptions below and let me know what I have missed.
The hospital has grid power but is unreliable and would like to totally convert to an off grid solar system. The hospital is in a very rural area. System needs to be robust, parts are difficult to get, basically have to be hand carried from overseas visitors/volunteers.
They require 24kWh per day. I am new to solar but I have watched a few youtube videos and read some of this forum and determined the following:
Batteries:
Operating temp factor 1( location will not be below 80 Deg F)
Autonomy days 1.5
Batter discharge limit 50%
Inverter efficiency 92%
Battery needs to provide 78,250 kWh
Battery voltage 48V
Battery Bank Capacity 1,630.43 Ah
Connection strings max =2
Battery Rating needed 815.22 Ah
Need 48 Batteries (2 parallel * 24 in a series string)
Is this right? price seems daunting. How to lower the cost. What would be a good battery selection?
Panels:
Sun hours at location 5.5, location almost on the equator.( I have not found a confirmed data source for this)
Panel efficiency 67% (dusty area soiling, no shade in area, voltage drop, controller efficiency and battery losses). This sounds like a high factor.
Power needed daily 24kWh
Gross panel Watts required 6,512 W (24,000/5.5 at 67% efficiency)
Choose 260W poly panels, (Astronergy VIOLIN ASM6610P-260(BF) Black Frame Poly Pallet (22) of Solar Panels) (https://www.wholesalesolar.com/18900...f-solar-panels)
Will use MPPT charge controller so need panel Voltage to be > system voltage of 48V. So two panel strings required. Total panels required = 26.
Size and weight is acceptable for existing roof.
What other panel consideration for a rural dusty area.
Charge Controller:
I didn't start on the controller until the panels and batteries are confirmed.
thanks,
Steve
The hospital has grid power but is unreliable and would like to totally convert to an off grid solar system. The hospital is in a very rural area. System needs to be robust, parts are difficult to get, basically have to be hand carried from overseas visitors/volunteers.
They require 24kWh per day. I am new to solar but I have watched a few youtube videos and read some of this forum and determined the following:
Batteries:
Operating temp factor 1( location will not be below 80 Deg F)
Autonomy days 1.5
Batter discharge limit 50%
Inverter efficiency 92%
Battery needs to provide 78,250 kWh
Battery voltage 48V
Battery Bank Capacity 1,630.43 Ah
Connection strings max =2
Battery Rating needed 815.22 Ah
Need 48 Batteries (2 parallel * 24 in a series string)
Is this right? price seems daunting. How to lower the cost. What would be a good battery selection?
Panels:
Sun hours at location 5.5, location almost on the equator.( I have not found a confirmed data source for this)
Panel efficiency 67% (dusty area soiling, no shade in area, voltage drop, controller efficiency and battery losses). This sounds like a high factor.
Power needed daily 24kWh
Gross panel Watts required 6,512 W (24,000/5.5 at 67% efficiency)
Choose 260W poly panels, (Astronergy VIOLIN ASM6610P-260(BF) Black Frame Poly Pallet (22) of Solar Panels) (https://www.wholesalesolar.com/18900...f-solar-panels)
Will use MPPT charge controller so need panel Voltage to be > system voltage of 48V. So two panel strings required. Total panels required = 26.
Size and weight is acceptable for existing roof.
What other panel consideration for a rural dusty area.
Charge Controller:
I didn't start on the controller until the panels and batteries are confirmed.
thanks,
Steve
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