JackFlorey
100 kW
Just did a quick test with the simplest possible solar range extender - a single panel bolted to the rack.
I used a Renogy 100W flexible panel on top of a 1/4" piece of plywood, bolted to the rack of an almost-stock RadCity. A Genasun controller converted the 18V from the panel to the 54.6V the battery wanted, and used the battery charge port to get the power to the battery. An old Powerwerx DC power monitor provided some monitoring.
In 900W/M2 sun (while stationary) I was getting 74 watts, which means the entire setup is ~82% efficient. (Some of that was less than ideal panel performance, some was losses in the charge controller.)
I took a ride at about 2pm to pick up groceries. I was seeing 65 watts traveling any direction but west. Going west my body was shading about 30% of the array and total output was 10 watts or so. Average power over the ride was ~300 watts so I was generating about 1/3 of usage while moving.
The big surprise was handling. I was expecting to feel the big wing back there, but it didn't feel any different than carrying a 2x4 sticking off the back. (i.e. some instability when turning rapidly but otherwise not a big deal.) There was probably some risk of it being blown over when parked, but in the 12mph wind it didn't happen. An unexpected benefit was that the panel shaded the panniers, which meant the groceries weren't in the sun.
After being parked outside for 5 hours (noon to 5pm) I saw 270 watt-hours added to the battery, or about 40% of total battery capacity.
I used a Renogy 100W flexible panel on top of a 1/4" piece of plywood, bolted to the rack of an almost-stock RadCity. A Genasun controller converted the 18V from the panel to the 54.6V the battery wanted, and used the battery charge port to get the power to the battery. An old Powerwerx DC power monitor provided some monitoring.
In 900W/M2 sun (while stationary) I was getting 74 watts, which means the entire setup is ~82% efficient. (Some of that was less than ideal panel performance, some was losses in the charge controller.)
I took a ride at about 2pm to pick up groceries. I was seeing 65 watts traveling any direction but west. Going west my body was shading about 30% of the array and total output was 10 watts or so. Average power over the ride was ~300 watts so I was generating about 1/3 of usage while moving.
The big surprise was handling. I was expecting to feel the big wing back there, but it didn't feel any different than carrying a 2x4 sticking off the back. (i.e. some instability when turning rapidly but otherwise not a big deal.) There was probably some risk of it being blown over when parked, but in the 12mph wind it didn't happen. An unexpected benefit was that the panel shaded the panniers, which meant the groceries weren't in the sun.
After being parked outside for 5 hours (noon to 5pm) I saw 270 watt-hours added to the battery, or about 40% of total battery capacity.