melbaylon
New Member
- Joined
- Jun 23, 2021
- Messages
- 20
I want to add solar panel that are different from my existing ones. I hope you can give me specific insights about this.
Here is a spreadsheet of my computations. As far as I know the total voltage of the string of PV array in series fits within what my solar charge controller can handle. But I'm not sure if I should consider Imp(current at maximum power) or Isc (short circuit current).
Key specs of the current setup
Specs of my solar charge controller
Specs of current solar panel in use
150W Solarhomes - Mono Crystalline
Specs of solar panel to buy
170W Bluesun - Mono Crystalline - Shingled
Location and weather
Planned configuration
All in one series string (2 150W + 3 170W)
Additional notes
Here is a spreadsheet of my computations. As far as I know the total voltage of the string of PV array in series fits within what my solar charge controller can handle. But I'm not sure if I should consider Imp(current at maximum power) or Isc (short circuit current).
Key specs of the current setup
- 300W solar PV array (2 150W in series)
- ML4860 60A solar charge controller
- 12V 400Ah LiFePO4 battery bank
Specs of my solar charge controller
- Max in put voltage: 150VDC
- Max power: 800W(12V)
- Max charging current: 60A
Specs of current solar panel in use
150W Solarhomes - Mono Crystalline
- Vmp 18.04V
- Imp 8.32A
- Voc 21.65V
- Isc 8.82A
Specs of solar panel to buy
170W Bluesun - Mono Crystalline - Shingled
- Vmp 22.55V
- Imp 7.54A
- Voc 26.65V
- Isc 8.05A
Location and weather
- Cagayan Valley, Philippines
- Temperature: 30±5°C
- Mostly sunny but it rains in the latter parts of the year
Planned configuration
All in one series string (2 150W + 3 170W)
Additional notes
- I’m following this guide on how to mix different solar panels https://solarpanelsvenue.com/mixing-solar-panels/
- I want to go with the 170W Bluesun panels its current rating is close to my existing solar panels
- If my 60A solar charge controller can't handle all 5 panels, I might remove 1 150W panel and save it for when I upgrade to a 48V system.
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