Advice on deep cycle setup?
Hello, I have a Safari van that I've converted into a camper. I replaced the starting battery with a Duracell Ultra Dual Purpose (Starting/Cycling) Battery that cost $105 (got it at batteries ...
Forum Discussion
During Bulk I think the panel does whatever current it can. The controller then fiddles with the panel voltage to get the most watts as controller input. IMO it does not "draw" amps, amps just are.
In Absorb, the panel still makes what amps it can, but the controller fiddles with the panel voltage to keep battery voltage from rising. If you turn on some DC fans in Absorb, the controller output goes up to meet that demand.
This is the part I don't know about. How a buck converter works in response to demand as that demand changes. It grabs more input to ---ISTR "balance" was used about here :( ---- but the controller still can only fiddle with the panel voltage.
It needs more watts so it uses more of the panel output current ( but does not "draw" that current ?) and ?? it lowers panel voltage closer to Vmp --actually it just changes the time "on" in its PWM to create a lower average voltage--
Example- start in Absorb with average voltage 35v (Vmp is 30v), 2 amps all going to the battery, output watts 70w
Turn on a 3 amp light. It is at battery voltage so output watts are 35 x 5 = 175? up from 70. But a 3 amp light at 14.8v is 44 watts, so Demand is now 70 plus 44 = 114w. So the controller lowers the panel voltage from 35 and uses more of the panel current to get 114 input watts.
So what is happening at the controller input? Input watts go up battery voltage has not changed since it is not carrying that extra 3 amp load from the light.
I don't know what does what to whom for the buck converter in the controller to find that 114 watts input to balance the new output.
In Absorb, the panel still makes what amps it can, but the controller fiddles with the panel voltage to keep battery voltage from rising. If you turn on some DC fans in Absorb, the controller output goes up to meet that demand.
This is the part I don't know about. How a buck converter works in response to demand as that demand changes. It grabs more input to ---ISTR "balance" was used about here :( ---- but the controller still can only fiddle with the panel voltage.
It needs more watts so it uses more of the panel output current ( but does not "draw" that current ?) and ?? it lowers panel voltage closer to Vmp --actually it just changes the time "on" in its PWM to create a lower average voltage--
Example- start in Absorb with average voltage 35v (Vmp is 30v), 2 amps all going to the battery, output watts 70w
Turn on a 3 amp light. It is at battery voltage so output watts are 35 x 5 = 175? up from 70. But a 3 amp light at 14.8v is 44 watts, so Demand is now 70 plus 44 = 114w. So the controller lowers the panel voltage from 35 and uses more of the panel current to get 114 input watts.
So what is happening at the controller input? Input watts go up battery voltage has not changed since it is not carrying that extra 3 amp load from the light.
I don't know what does what to whom for the buck converter in the controller to find that 114 watts input to balance the new output.
