My panels 12 250-watt panels will be approximately 250 feet from the inverter. I have a surplus 600 ft roll of heavily insulated 10 ga submersible well wire left over from a well replacement that is only a few years old and looks new. Would you use it for the run?.
250ft distance from panels to bldg
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sunshine_eggo
Happy Breffast!
Voltage Drop Calculator
This free voltage drop calculator estimates the voltage drop of an electrical circuit based on the wire size, distance, and anticipated load current.
www.calculator.net
"Estimated Resistance" tab
It would largely depend on what voltage and current you plan to run. What is your voltage limit on the charger/load that you plan to connect the PV to?
sunshine_eggo
Happy Breffast!
You need to know the actual voltage (series Vmp of the panels) and current (total Isc of the panels) you'll be using. Calculate voltage drop using the website. < 3% is great.
My PV is about 250ft from the building w/ charge controller & electronics.
PV operates at about 330 vdc.
I used #10 THHN/THWN, wire is labeled "600 volts", so I guess the insulation is OK
for my application.
Tiny voltage drop has no impact on solar production.
PV operates at about 330 vdc.
I used #10 THHN/THWN, wire is labeled "600 volts", so I guess the insulation is OK
for my application.
Tiny voltage drop has no impact on solar production.
I found the panel specsVoltage Drop Calculator
This free voltage drop calculator estimates the voltage drop of an electrical circuit based on the wire size, distance, and anticipated load current.
"Estimated Resistance" tab
- Rated Power: 250W
- Open circuit voltage (VOC): 37.6 V
- Max power voltage (VMP): 30.3 V
- Short circuit current (ISC): 8.85 A
- Max power current: 8.27 A
- Power Tolerance 0/+3%
- Maximum system voltage: 600V (UL)
- Fuse Rating: 15 A
- I bought 12 for starters. Looks like I can run 12 in series for the one LVX6048 correct?.
sunshine_eggo
Happy Breffast!
10S would likely be safe on that unit.
On the voltage calculator page, enter 303V, 9A, 250' and 10awg copper.
On the voltage calculator page, enter 303V, 9A, 250' and 10awg copper.
sunshine_eggo
Happy Breffast!
12S would destroy the MPPT unless you live in an area that never gets even mildly chilly.
You only add current if the panels are in parallel.
I gave you the numbers to use for a single 10S string. For 12 panels, you'd need to use a 6S2P array. Recommend you buy 8 more and go 10S2P. If you want to stick with what you have and minimize voltage drop, 10S.
6S2P = 182V, 18A
10S2P = 303V, 18A
Thank You so much. I will print this out and save for reference. This has really helped me. Thank You, waffle man.
sunshine_eggo
Happy Breffast!
Good catch.
Excellent idea, Thank You sir.
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