Hiya,
I'm almost ready to spend on my electronics, I thought I was finally grasping things but I'm second guessing everything now.
1. I have (2) 200 watt, 24 volt panels. I am wiring in parallel to stay at 24 volts.
Short circuit current totals only 11.66 amps. Open circuit voltage is 45.4 volts. Based on that, I calculated that I can use the Victron 75 / 15 MPPT controller.
2. I figured my likely energy usage, I'm going to need 200 Ah of batteries. I'm looking at either (2) 12v @ 206 Ah each (in series) or (2) 24v @ 100Ah each (in parallel).
3. Sweet Will Prowse's 24v system videos keep touting a 40 amp MPPT controller, though, and now I'm wondering if my little 75 / 15 MPPT will charge/handle/work best on these batteries. Both types of batteries spec a Recommended Charge Current of 20A and a Maximum Charge Current of 50A. Won't my MPPT only push out 15A? Do the batteries *need* a 40 amp MPPT?
4. I also need a 24v --> 12 v converter and Will again recommends a 40 amp machine. And I'm just unsure why.
I'm hardcore unsure of everything now. I'd appreciate any help.
-kb
I'm almost ready to spend on my electronics, I thought I was finally grasping things but I'm second guessing everything now.
1. I have (2) 200 watt, 24 volt panels. I am wiring in parallel to stay at 24 volts.
Short circuit current totals only 11.66 amps. Open circuit voltage is 45.4 volts. Based on that, I calculated that I can use the Victron 75 / 15 MPPT controller.
2. I figured my likely energy usage, I'm going to need 200 Ah of batteries. I'm looking at either (2) 12v @ 206 Ah each (in series) or (2) 24v @ 100Ah each (in parallel).
3. Sweet Will Prowse's 24v system videos keep touting a 40 amp MPPT controller, though, and now I'm wondering if my little 75 / 15 MPPT will charge/handle/work best on these batteries. Both types of batteries spec a Recommended Charge Current of 20A and a Maximum Charge Current of 50A. Won't my MPPT only push out 15A? Do the batteries *need* a 40 amp MPPT?
4. I also need a 24v --> 12 v converter and Will again recommends a 40 amp machine. And I'm just unsure why.
I'm hardcore unsure of everything now. I'd appreciate any help.
-kb