Cheeseboy wrote:With a motoenergy 0907 how much should I be able to safely up the battery amp limit to?
120A is incredibly conservative isn't it? I am thinking 170A is still a safe current limit?
It's impossible to know until you put it in use, because it's so motor and load and gearing dependent. Definitely don't change it without first trying it to give a baseline. Running an underpowered motorcycle is far different that on a high powered ebike. Do you even know what the phase current limit setting? My guess would be for the phase amp limit is 250-300A, so if you were comparing to a Kelly, that would be the current number for comparison. Once you're up and running, then test it easy at first, and then progressively harder with frequent stops to check motor and controller temps. Hills will be the biggest test, and long hills with partial throttle being the ultimate stress test, so do WOT first. I've blown so many controllers that I spend a lot of time learning the limits of new controllers to avoid more.
Once you get it to where it gets hot under the most strenuous use, I've found you can go at least 50% higher by adding a blower to suck fresh cool air through the inside of a controller. I block the open clear routes with cardboard, under the board and the more open side away from the fets to direct the air flow toward the heat sink bar and the fets. If you feel warm air coming out of the blower, then you're doing some good. Radial fans don't do squat compared to blowers because radial fans can't pull a pressure without high power like a ducted fan, but the little 2W blowers I use work great. They're made to pull air through a Bosch toolpack while charging and the same flow goes through the charger too to keep it cool. I put the blower at the rear of the controller, and put intake holes at the wire end only on the FET side. Of course you need some kind of shielding or angled placement to avoid water and debris from getting into the controller, but your wire end should be protected like that anyway, including wire routing to form a drip loop before entering the controller. To run max power you definitely want a good fresh air flow outside of the controller too.