John Drake Services, Inc.
1427 E. 68th Street
Long Beach, CA 90805
electricity from the sun by John Drake II | home
About Us | About this website. | Getting Started | Solar Panels / Photovoltaic Modules - Read Before You Buy | Make A Plan | PV System Layout and Parts | Start with the loads you are going to operate | Battery Types and Sizing | Battery Safety | Battery Charging Voltages and Temperature | Battery Trouble Shooting | Charging Batteries - You can't have everything. | Battery State of Charge and Measurement | Safety Devices Fuses and Circuit Breakers | Series & Parallel Wiring | Wiring and Power Distribution Connections | Photovolatic Module Specifications - Real or a Pipe Dream | Photovoltaic module solar panel location and positioning | Photovoltaic Module and Solar Panel Information | Charge Controller Types | Wire and Cable Types | Wiring - Doing it Right | Connections for Wiring | Voltage Drop - Wire Loss, What are they? | Outdoor Connections | Wire loss - Voltage drop charts | D.C. to A.C. Inverters | Low Voltage D.C. Lighting & Color Temperature of Light | Battery System Monitoring | Dont fool yourself - Spending your money wisely. | Solar Converters GS-1AC | Linear Current Boosters for Water Pumping | Utility Grid Intertie Systems | Solar Insolation Chart | More Information | Alternative Energy Expectations | Power Needs Worksheet | Reference Sources | Contact Us
Wiring and Power Distribution Connections
Minimumizing the number of connections in a low voltage d.c. system is very important.
Each connection is a site for voltage drop, heating and corrosion.
On this page we will concern ourselves with power distribution blocks, feed through / splicer blocks and heat shrink tubing.
Power Distribution Blocks:
Whenever you want to take a large cable and split it up into several smaller wires a pdb really comes in handy.
It is basically a heavy duty captive lug which has one or two holes on one end (with set down cable locking screws) and
several smaller holes on the other side as shown in the pictures above.
I have seen them in single, two, three and four pole variations.
For our applictions, a two pole does the job.
These can be used as part of a photovoltaic combiner box with smaller wires coming in from each pv panel and a larger
cable going out to the charge controller.
For loads, heavy cable goes into the block and smaller cable goes to each load.
We use them for combining the individual input of several photovoltaic modules as well as for operating many small
load circuits from heavier supply wire.
To be continued.