Wiring-series v. parallel or?
Need wiring advice--am upgrading our backup solar power and will have approx. 940 watts.
24 volt system
SRNE 40A MPPT controller
Cotek 3000W 24V. pure sine inverter
4- 208 AH 6V GC batteries Would like to replace these with something in the 300AH range in the future. 350-370AH too much?
Have one 5 yr. old Trina 230w, (removed 4- 70W panels which the installer added a 20Amp. Midnite Solar combiner box).
Now adding 3 new 235W panels, however, the final panel, as delivered, is 255W. They will take it back if necessary and switch to 235W
Under 10% difference...an issue?
This setup is primarily for powering the washer/dryer a couple of times a week, and on occasion, a mini fridge of 1.5amps or small TV.
Washer is 9 amp and propane dryer is 6 amp.
Wiring in series, parallel, or a combination is the question.
So, here's what I've read elsewhere...do you agree?
Series produces more voltage for larger appliances while parallel produces more amps for charging batteries faster.
Series only gives less battery life but produces more power in volts, but less amps. (Battery life is very important here due to shipping cost.) And is subject to power loss from tree/house shading. Not an issue here. But thick clouds are.
Series and Parallel combined...a good balance of watts and amps and extends battery life.
An MPPT CC will lower the volts but raise the amps.
I'm trying to get the professional installer to do the wiring but the office wants to send an "installer" to do the job. Last time this happened the installer got the wiring wrong and the owner came and did it right.
Adding to the mix is, he doesn't speak English. My Spanish is ok but not for specifics like this.
In this area (central Caribbean) finding expert advice is difficult.
Climate is typical Caribbean, lots of sun and can be hot. Much like the southern US in summer.
So far, series/parallel combination seems right. What do the experts think?
If I go series/parallel combination, what size wiring do I need? It's about 24 feet from the panels to the CC.