mppt vs pwm
Hi, A nice little video comparing mppt vs pwm with the batteries in bulk mode. mppt vs pwm
Forum Discussion
BFL13 wrote:
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.
Same observation, soley for the T-1275 12V battery. At the time I didn't know the Solar 30 was a good match when I ordered it, but from the get go, I would set my 120 w panel, since replaced with a 150W panel good for 8.4 amps, that I sometimes see 9.1 amp peak with it, when the Solar 30 Charge controller is set for 15.0V. My SG seems to stay steady among all 6 cells with this combination... good news when you hear how finicky the T 1275 can be. Solar panels are a good set up for this type /size /shape of battery, and the 15.0v is also working for Landyacht318 and his Screwy 31 battery too.
I have no dog in this hunt for MPPT vs PWM, since I have a smaller set up and 8.5 to 9 amp hours from my 150w panel is getting it done for me daily.
