How many solar panels, battery require for running the solar air conditioner?
We learn it is working current is 30A, and rated working voltage is 48V DC from KFR18K048D solar air conditioner specification sheet, KFR18K048D solar air conditioner used variable speed compressor and fan motors, its controls integrated smart temperature sensing, for example, on Cool mode, when user setup air conditioner temperature, if room temperature is high, compressor and fan motors will automatically run in high speed; When room already cooled down, air conditioner will reduce compressor and fan motor speed keep the room temperature close to user setup temperature that keep room in comfortable temperature;
So, the KFR18K048D solar air conditioner actual working current is 0A ~ 30A depend on user's actual using state;
We suppose there are two working current we have:
Condition 1) KFR18K048D solar air conditioner is always working at 30A current. ( We suppose user installed the air conditioner for a very large and high temperature room)
Iac-working1 = 30A
Condition 2) KFR18K048D solar air conditioner working current is 22A current average value from user power on air conditioner to power off air conditioner.
Iac-working2 = 22A
And the voltage is constant, 48VDC.
Then, we know Pac-working1 = Iac-working1 * V = 30A * 48V = 1440W Pac-working2 = Iac-working2 * V = 22A * 48V = 1056W
Case 1) If we like to running KFR18K048D solar air conditioner about 8 hours per day (at sunlight time or night time)
If consider air conditioner working at condition 1, and if there is no sunlight, the power for running air conditioner want obtain from battery, then the battery we need: Iac-working1 * Time / battery discharge coefficient = 30A * 8 Hours / 0.8 (we normally think the battery discharge coefficient is 0.8) = 300AH, Voltage = 48V;
For obtain 48V, 300AH battery, we can use 12V/150AH standard battery 8 pcs connect them as left drawing chart 2 showing:
And the 12V battery charging voltage is 13.8V, 4pcs in series connected battery, charging voltage is 55V;
Battery charging time = battery capacity / Charging current
If we think battery charging time = Effective solar light time (charge full battery when the solar can generate power through solar panel array),
The Charging current = Solar battery capacity / Effective Solar lighting time
We suppose solar lighting time is about 8 hours from sun rise to sun set per day, then, Charge current = 300AH/8 hours = 37.5A
Now, we know, Solar panel power = Charging current * charging voltage = 37.5A * 55V = 2062.50W
We normally use 230W solar panels connected as drawing chart 2 at right to obtain 2300W solar panel array.
For case 1, we need following items:
| Model Number | Product Name/Description | 8 hours
running components quantities (PCS) |
| KFR18K048D | DC48V, R410A, 18000Btu/H Solar Air Conditioner | 1 |
| CHN230-60P | 230W Polycrystalline silicon solar panel module | 10 |
| MPC48V100A05V | Solar Charge Controller | 1 |
| 12V150AH | 12V, 150AH Solar Battery | 8 |
If consider air conditioner working at condition 2, reference above comments, then
Battery we need : 22A * 8 hours / 0.8 = 220AH, 48V
We can use 12V/100AH battery connected as drawing chart 2 at right to obtain 48V/200AH battery;
Solar panels array power = 220AH/8 hours * 55V = 1512.5 W, We can use 230W solar panels 8 pcs
So then we need following items:
| Model Number | Product Name/Description | 8 hours
running components quantities (PCS) |
| KFR18K048D | DC48V, R410A, 18000Btu/H Solar Air Conditioner | 1 |
| CHN230-60P | 230W Polycrystalline silicon solar panel module | 8 |
| MPC48V100A05V | Solar Charge Controller | 1 |
| 12V100AH | 12V, 100AH Solar Battery | 8 |
User can calculate the actual solar components needs refer to above comments.
Case 2) If we like to running KFR18K048D solar air conditioner only at sunlight time
If run KFR18K048D solar air conditioner only at sunlight time, We still can use the same connection drawing as chart 2; But, the Solar battery in circuit, actually it is working like a capacitor. So we also can remove the solar batteries.
Solar panels we need is :
On condition 1) we need 1440W solar panels at least (does not consider of solar panel's efficiency)
On condition 2) we need 1056W solar panels at least (does not consider of solar panel's efficiency)
we need following items:
| Model Number | Product Name/Description | running
only at sunlight
time components quantities (PCS) |
| KFR18K048D | DC48V, R410A, 18000Btu/H Solar Air Conditioner | 1 |
| CHN230-60P | 230W Polycrystalline silicon solar panel module | 6 or 8PCS |
| MPC48V100A05V | Solar Charge Controller | 1 |
| 12V100AH | 12V, 100AH Solar Battery | 4pcs (Optional) |
Important Notice:
Above comments are tested at east region of China and feasible works, Even so, the KFR18K048D solar air conditioner power consuming relate to user's installation ambient temperature, environment. The Solar components selection or solar power obtained relate to solar panels quality, battery quality, geographical solar intensity...etc factors.
We strongly suggest distributors, marketing agents have to conduct field tests to have the results of reliable and most economical solar components configuration upon local installation environment and geographical solar intensity.
Chart 1
Chart 2