I'd to deploy a UPS system as shown below. My primary need is the setup shown in black, a simple setup feeding directly to my equipment. The transfer switch is 15A which is more than I need.
Considering the black setup:
At point "A", what can I use to isolate the batteries?
Also at point "A" or after, what breaker(s) can I use to limit amps and damage to the inverter? On page 11 of its manual, it states a 250A ANL fuse but I'd rather use a breaker.
Should I combine the wires to the inverter into one or just screw all three to its inputs?
How do I ground the charger and inverter (G1, G2)? The manuals only speak of DC ground, as in a vehicle. Can I just use the AC ground? Wire size?
My optional need is to feed three 15A circuits from the main panel. Note that the total amp load of all three of these curcuits is only 10A, if that. The blue setup shows one feed off the UPS APC transfer switch. The APC has several female outputs, again, 15A total output. My desire here is to have a switch to select between the UPS setup and the main panel. This will allow me to switch to the main if I need to service the UPS:
What should I use for the select switch(es)?
If a subpanel is more appropriate here, feeding off one APC output, please advise on how to wire that up.
Battery is 3 x lead-acid Lifeline GPL-31XT AGM
Sorry about the links. Perhaps this will work:
Again, I already had the electronics and the batteries were given to me for free. I am not forcing their usage after an unwise purchase. I will not be buying Chinese junk, I only used the links above as examples.
The manuals also refer to permanent, non-vehicle use for the electronics. So, I am good there. I will ground to the AC ground as advised.
Again on the isolation, you say nobody does that, regarding the diodes, as long as the batteries are identical. Well, my batteries are identical. But, what prevents current from flowing between two batteries if they are "off balance" instead of all current flow going to the inverter?
I appreciate your advice about using a 24V or 36V inverter with series batteries. My need is long UPS duration not power capacity. Will the series, 24V or 36V setup (batteries and inverter, the charger is the same) give me equal duration as the parallel setup? If so, great, I'll invest in a new inverter. Any brands recommended?
Finally, the Siemens setup is ideal. I will look into that for my long term solution. For now, I will focus on getting it all to work in the simple, non-panel setup.