More Solar for "Us"
Ok, I went off.the deep end? Bought 3 used 37watt uni-solar panels and a blue sky 2000e controller for the hefty price of $400, They were being listed as 75w panels, they are not The tested open...
Forum Discussion
Voltage drop between controller and battery is just as much a concern with PWM mode as with MTTP. Both converters output a regulated voltage. The converters have no knowledge of line drops to the battery. They are equally hindered by line resistance.
It's totally different between panel and controller. The MPPT controller needs low line resistance, while the PWM (more or less) doesn't care.
If it was my project, I would get some base line measurements with the MTTP controller before making wiring mods. Test at noon for best solar power.
Your line resistance is about 0.03 ohms. It's on the high side. You may have significant contact resistance. I would check all connections. What's the cable length and gauge between controller and battery? We can then calculate the resistance to check if it's close to 0.03 ohms. If it's not, then you got other problems.
Sal
It's totally different between panel and controller. The MPPT controller needs low line resistance, while the PWM (more or less) doesn't care.
If it was my project, I would get some base line measurements with the MTTP controller before making wiring mods. Test at noon for best solar power.
Your line resistance is about 0.03 ohms. It's on the high side. You may have significant contact resistance. I would check all connections. What's the cable length and gauge between controller and battery? We can then calculate the resistance to check if it's close to 0.03 ohms. If it's not, then you got other problems.
Sal
pianotuna wrote:
Voltage drop is not usual a concern until you go to MPPT type controllers.
