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PoC single solar panel system
#11
I had several APC 1500(s) all over the house when I started.   My original idea was to use 18650 as batteries and inverter aspect to provide 120v.

Turns out that 7s is compatible with APC 1500(s) as the APCs charge up to 27.8v (3.97v/cell) and cutout at 21.6v (3.08v/cell).   7s7p in an 7x8 18650 cell holders fit nicely in place of original battery.  You can stack 2 high if you want double capacity.     

I did 7s7p in 7x8 leaving 1st empty row for wiring/fuse/balance cable.


The problem with APCs are 
- They must be plugged into 120v AC source to 'activate' the charge cycle so they will supply power when disconnected.  So you can't just use it in isolation to charge/discharge/charge/discharge. It just won't turn on after the discharge till you plug it in for a moment.
- They only go to 3.97v/cell - so you loose 4.0 -> 4.2 range of power if that is of concern.
- They draw 40-60w/hour just sitting there.   That's alot of power burn.   **In fact I had 6 of them around the house and was shocked to find out I was buring 6 x 60w = 360w per hour x 24hrs a day = 8.6Kwh/day in idle mode.

 But hey - I confess I also thought it was a great starting place, so no judgement!

I consolidated but still use 2 of them downstream of the automatic transfer switch to provide 'solar circuits' in house for computer/tv areas so the power drop during automatic transfer of grid/PV does not affect computers AND use my original 7s7p 18650 batteries in place of AGMs, so it was not a waste.
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#12
(05-14-2019, 07:11 PM)OffGridInTheCity Wrote: The problem with APCs are 
- They must be plugged into 120v AC source to 'activate' the charge cycle so they will supply power when disconnected.  So you can't just use it in isolation to charge/discharge/charge/discharge. It just won't turn on after the discharge till you plug it in for a moment.

I've been able to turn mine on without being plugged into the AC. Maybe it depends on the model. I've had an APC300, 550, and SUA2000 SmartUPS. the 300 and 550 units are generic dumb models used for computers and other electronics that most standard people forget about until it beeps about a dead battery. With those, I had to turn the switch on, then hold the "test" button in for a couple seconds and it fired right up.
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