New consulting relationship with GreenTecAuto begins
What actually goes wrong with the batteries????
A look at todays Hybrid and EV battery packs
Battery packs exposed
Keeping Warm In New England
Plugging into the SUN
Making a small solar concentrator
Building MIMA and the plug in adapters
Converting a telephone truck to electric
DIY dual pulse Capacitor Discharge Spotwelder
Chevy Bolt EV joins the family
Getting in shape while making electricity
Retirement
Replacing gasoline with solar electric lawn equipment
What is Genesis One?
How to stop the aging process DIY
MIMA Install Day 2005 a Big Success!
Building a hybrid car grid charger
Tapping into the Wind
Expanding MIMA with the Distribution board ( users projects )

AC source transfer relay is finished

AC source transfer relay is finished
transfer system is finished

Finally got the big 50A transfer relay system built.
The big relays need 120VAC to operate the coils, so I used 2 of the same 2A solid state relays that we used on the grid charger to turn them on and off. The SSR feature opto isolated dc inputs that will operate from 3 to 32 VDC. After doing some measurements, the opto input seems to be current regulated at 10 ma, so it was easy to get another series led to act as an indicator with no need for a resistor. Will power the optos with 12VDC

Since we still needed 120VAC for the relay power, I put another SPDT switch so the ac can either come from the inverter output or the grid input.

I used a 9 pin connector (grid charger) for the source control lines and 12V power, which will run to the load management computer box.
The mounting location for this transfer box is not very accessable so I had to fully wire the box before it is mounted.