phase control using multiple SSR's

Projects Programming
1

So I've read a lot of threads where the possibility of phase control is debated. The main issue seems to be the slowness of SSRs to trigger. The second problem is that a triac will have 230v on the variable resistor, which means it's impossible to use transistors. And a triac needs 10v to trigger anyway, which the arduino doesn't put out.

I think I have found a solution but need help coding it.

I am using a 8 SSR module, so 8 inputs. Across each pair is a resistor. The output of the first feeds the input of the second (link) and so on. Lets use 50k resistors. The end result is 9 possible outcomes.

  1. No relays activated. Sum the total of resistors (400k)
  2. Relay 1 activated. Sum the other 7 resistors (350k)
  3. Relay 1-2 activated. Sum the other 6 resistors (300k)
  4. Relay 1-3 activated. Sum the other 5 resistors (250k)
  5. Relay 1-4 activated. Sum the other 4 resistors (200k)
  6. Relay 1-5 activated. Sum the other 3 resistors (150k)
  7. Relay 1-6 activated. Sum the other 2 resistors (100k)
  8. Relay 1-7 activated. Sum the other 1 resistors (50k)
  9. Relay 1-8 activated. No resistors (0k)

This resistance is put across the triac. Thus giving 9 different output levels at 230v.

The controlling variable is current going to the battery. I want a min of 1A going to the battery. All excess solar capacity should be sent to the triac.for simplicity let's say the triac range is 1 to 9A.

Output pins (1,2,3,4,5,6,7,8)
So if A (battery current) > 2, increase triac (make next output pin in string go high)
if A < 2, decrease triac (make current highest pin in string go low)
default triac would be 400k ie no pins high

How to write this?

2

Phase control with an SSR is tied to whether said SSR is zero-crossing or random fire.
With "ZC", phase control is not possible.

3

Does this look OK?

void setup ()  {
j=0
float amps
string pin1="LOW" 
string pin2="LOW" 
string pin3="LOW" 
string pin4="LOW" 
string pin5="LOW" 
string pin6="LOW" 
string pin7="LOW" 
string pin8="LOW" 
} 

void loop ()  {

 if (j>=0 AND amps>2 AND j<7) { j=j+1 } 
else if (j>0 AND amps<2 )  { j=j-1 } 
 
if (j>0) { pin1=HIGH } else { pin1=LOW } 
if (j>1) { pin2=HIGH } else { pin2=LOW } 
if (j>2) { pin3=HIGH } else { pin3=LOW } 
if (j>3) { pin4=HIGH } else { pin4=LOW } 
if (j>4) { pin5=HIGH } else { pin5=LOW } 
if (j>5) { pin6=HIGH } else { pin6=LOW } 
if (j>6) { pin7=HIGH } else { pin7=LOW } 
if (j>7) { pin8=HIGH } else { pin8=LOW } 

for (wj=0; wj<=8; wj=wj+1); {
digitalwrite(wj, string(pin + j) 
} 
delay 1000
}/code]