mppt vs pwm
Hi, A nice little video comparing mppt vs pwm with the batteries in bulk mode. mppt vs pwm
Forum Discussion
The $102 Eco-Worthy MPPT 20a controller has an adjustable high set point to reach Vabs, an adjustable Float, and the voltage that triggers a return to MPPT is not adjustable but is 13.2v.
It drops to Float right after reaching Vabs, so if you want to spend any time at that voltage you have to choose the Float voltage to be the same as Vabs. Then you must adjust the Float voltage down to your chosen value if you want to float at a "storage" level for maintaining the batts while not camping..
Since the Float only goes up to 14.4 and I choose 14.8 as Vabs, I get to 14.8 at some point during the day and then it drops to 14.4 till dark. Then voltage falls off to actual Vbatt by morning which is below 13.2, so MPPT kicks off again for the new day.
My 6v batteries really like that profile and get to baseline SG without needing an equalize session. My T-1275s want more time at 14.8 or higher, so this controller is not quite right for them. (The PWM Solar30 stays at the chosen Vabs -can be up to 15- till dark so that controller was better for the T-1275s as it turned out)
PWM and MPPT controllers have adjustable settings depending on models and price. As noted what happened between my 6s and T-1275s, you should compare your battery specs with the controller specs to get a good match before buying.
It drops to Float right after reaching Vabs, so if you want to spend any time at that voltage you have to choose the Float voltage to be the same as Vabs. Then you must adjust the Float voltage down to your chosen value if you want to float at a "storage" level for maintaining the batts while not camping..
Since the Float only goes up to 14.4 and I choose 14.8 as Vabs, I get to 14.8 at some point during the day and then it drops to 14.4 till dark. Then voltage falls off to actual Vbatt by morning which is below 13.2, so MPPT kicks off again for the new day.
My 6v batteries really like that profile and get to baseline SG without needing an equalize session. My T-1275s want more time at 14.8 or higher, so this controller is not quite right for them. (The PWM Solar30 stays at the chosen Vabs -can be up to 15- till dark so that controller was better for the T-1275s as it turned out)
PWM and MPPT controllers have adjustable settings depending on models and price. As noted what happened between my 6s and T-1275s, you should compare your battery specs with the controller specs to get a good match before buying.
