Re: [RE-wrenches] 300W 72 cell micro inverters

Hi: It's all about cost versus benefit. The following goes through it in more detail. http://enphase.com/global/files/Enphase_White_Paper_Module_Rightsizing.pdf With large commercial systems, the best return on money invested is with 30% to 70% oversizing. JARMO

[RE-wrenches] Sunny Island Failure and various related issues

Friends: I have an existing service issue with a Sunny Island 4548 system shutting down unexpectedly. The system is off-grid with generator, two inverters, DC coupled charging. The batteries are a set of used Full River VRLA L-16s (3 strings of 8). We tested the at-rest battery voltages and

Re: [RE-wrenches] Sunny Island Failure and various related issues

Hi William; Yes I'm getting too old to let manufacturers off the hook anymore. They just don't pay me enough (wink, maybe if I ever was compensated for service calls?) Unfortunately I have had the exact same experience with SMA's phone tech support. I was having setup issues that were not