Hey Folks,
I realized I wasted an opportunity to learn rather than (as now I read it) defend my position - not what I set our to do. Remember, I don't care about night, I realize there may be weeks without sunlight, and I want to power 3 things...
To those who are saying "Battery", even if was short on capacity, I now ask why? I've read some posts or blogs that say excess power needs to go somewhere, therefore you need batteries and I say "BS". There is no power if there is not voltage
and current. As proof to doubters I ask "OK, what happens in a sunny day at noon, no load, and the batteries are on float? Nothing. The panels go to max voltage and collapse. Many have said "things fry" and I ask "what things?".
For an Off-Grid system:
- PV (no power at open or short)
- DC-DC converter which regulates the voltage to the Inverter. (Perhaps if the No-Load Voltage of the panels is higher than the DC-DC converter allows, it would pop, but I wouldn't spec the system as such).
- Inverter to convert DC to a sinewave and is regulated by load - too less Z, it goes into foldback. Battery Charge Controller optional and in my case not required (unless there is a sound argument why I have to have one).
I get it some electronics will not like the fluctuations of a say a cloud, but I am talking about two inductive loads (motors) and a microwave. I might lose my microwave one day, but the motors will spin on. If I am judicial (say using switches for priority) the well pump or compressor will get full attention. I can look at the sky and see a cloud is approaching and shut things down. And I don't have the overhead of 60A charging batteries - that power is strictly for on-demand essential service. And why can't I oversize my array for the needed bump to start the motor?
Please, what do I have wrong here?
John
After this, I would like to shift to the solar water for thoughts if you allow as it is an interesting topic and I blew it off - sorry - but don't want to wander yet. You Folks are experienced and helpful and I have been not thinking and defensive. May we start anew?