1. Solar Charge Controller With Dump Load Circuit Built By Matt Smyrski

2. Description

3. Specifications Solar Charging Current: 0 to 20 Amps continuous. Nominal Battery Voltage: 12V. Recommended Battery Capacity: 0.5 to 400 Amp Hours. Photovoltaic Panel Voltage Ratings: 12V - 23V, (ex: 36-40 cells). Maximum PV input voltage: 25VDC PV Panel Power Rating: 1W to 240W (90ma - 20A). Voltage Drop During Charging: 0.5V @ 10A, 1V @ 20A. Float Voltage Adjustment Range: 13V-15V (range can be altered using pot). Night Time Battery Current Drain: 0.5-1.9ma. Fuse Rating: 20 Amp standard ATO automotive fuse. Fits into a standard 4" X 4" electrical utility box, can be mounted on the cover plate.

4. Circuit Schematic

5. Breadboard Built

6. LEDs The green and red LEDs are used for the float voltage.  Find in battery specs  Optima – 13.8 Volts, 1 Amp max  Adjust using the potentiometer  When the battery is low the LED will be red  At the float voltage the LEDs will alternate

7. Dump Control +Solar Panel External Load Pin 2 of IC2a

8. Dump Circuit Connect:  Electric Heater  Water Heater  Lighting Circuit  Water Pump  Anything With A Fairly Large Resistance

9. Batteries Connect any size 12Volt battery to charge: 18Ah55Ah

10. Batteries Cont. → Batteries can also be connected in parallel for more amperage and longer life when powering various appliances. → Will take longer to charge.

11. How Does This Circuit Help? ‼ The rising cost of living. Become independent from the power companies.