Here's a system built in September, 2014 that makes use of 24-Volt/128-Watt panels. I'm trying to leave nothing out. The components in the list are usually illustrated below. Shipping is free unless otherwise noted.
Quantity | Description | Price | Total | Notes |
---|---|---|---|---|
4 | Solar panel, Sharp NE-128AH 24-Volt / 128-Watt (Solar blvd) | $83.20 | $332.80 | Includes $159.52 for shipping |
4 | Battery, Interstate, 6-Volt, deep-cycle, golf-cart (from local Costco) | $15 core + $83.99 | $423.75 | Includes $24.75 sales tax |
1 | Charge controller, Renogy 30-Ampere PWM, 12/24-Volt, | $29.99 | $29.99 | |
1 | Inverter, Power Bright ML400-24, 24-Volt / 400-Watt to 110=Volt AC | $43.82 | $43.82 | |
1 set | Panel Y Connectors, Signstek Y branch MC4 | $21.99 | $21.99 | |
1 set | MC4 Panel Connectors, Male/Female, 5 pairs | $8.30 | $8.30 | |
1 set | 4-AWG Battery Cable, Cobra heavy-duty cabling kit | $24.12 | $24.12 | |
1 | Fuse holder, Scoshe, single | $6.95 | $6.95 | |
4 sets | Panel mounting brackets, Renogy Z brackets | $12.99 | $51.96 | |
1 | Assembly tool, Renogy MC4 connector | $6.99 | $6.99 | |
Total | $950.67 |
The solar panels are connected in parallel to retain their basic rating of 24 Volts; this is done using Y-connecting cables. Together, the solar panels put out 720 Watts (30 Amperes at 24 Volts). This is more than the inverter will endure—need to understand how to protect inverter so it's never asked to draw more than 400 Watts (3.3 Amperes). Do they make 3-Ampere breakers?
The batteries (4×6-Volts) are connected in series to make 24 Volts; this is done using 4AWG cable from post-to-post-to-post, etc. with positive and negative cables joining the charge controller.