Off Grid Solar Power Simplified

• Voltage: U or V
• Current: I
• Resistance: Ohms
• Power: Watts
• Watt-hour: Wh
• Amp-hour: Ah

Ohms law: V=I × R

Power: P=V × I

Energy: E=P × t

Energy Cost: Energy Cost=Energy in kWh × Rate in cents per kWh

Amp Hours: Amp hours=Amps×hours

1W DC =1VA

Direct= DC power

Alternating = AC power also known as a sine wave.

• Wire stripper
• Cable stripper
• Lug crimping tool or Hydraulic crimper
• Hammer lug crimper
• Wire crimper
• Conduit cutter for PVC or metal
• Screwdrivers
• Needle nose pliers
• Wire cutters
• Cable cutter
• Hex nut ratchet set
• Torpedo level
• Hole saw
• Cordless drill
• Drill bits
• Safety goggles

• Wire lugs: get them at your local hardware store. The ones you find online are too thin.
• Crimp connectors: same as wire lugs.
• MC4 connectors
• Busbars
• Displays only use these for lead-acid batteries
• Cable gland
• Combiner box
• Fuses: MIDI, MEGA, ANL, T-Class: only buy name brand fuses
• DC isolator switch for battery
• DC isolator switch for solar panels

Link to the load calculator here.

Link to PV Watts here.

Tilt angle calculator here.

Link to wiring resources on my website here.

Simplified voltage drop calculator here.

PV voltage drop calculator here.

DC-to-DC charger voltage drop calculator here.

More information about batteries:

• Battery charging in series or parallel
• Multiple charge controllers to one battery
• How many batteries for a 3000W inverter?
• What is C-rate (video)

DC to DC charger wire and fuse size calculator here.