Re: Solar panels

On 6/1/24 8:32 PM, Don Y wrote:

On 6/1/2024 6:29 PM, boB wrote:

Not sure how to avoid excessive charge currents into the battery if it can't
take the full solar output.

>
I think you have to be able to "talk" to the module to tell it how you would
like it to behave, NOW.

>
The MPPT controller simply raises the PV operating voltage above
Vmp...  At Voc, the current becomes zero. Whatever Vpv gives the
correct controller output voltage to the battery it is charging.

 You have to signal to the controller that the battery is charged;
that it can't (shouldn't) continue to accept charge.
 

That will happen automatically when the battery reaches the set voltage.
Some of the charge controllers allow configuration for various parameters such as 100% charge voltage so that it will work with different chemistries.
In your case your load could be directly across the battery.
The one thing that is not obvious to me is how to limit the charge current if you use a small battery where the solar available could exceed the allowable battery charging current.
Maybe you could add a controllable dump for when solar generation significantly exceeds your load consumption?
kw