“Install the Auto-Transformer so off-grid 420V-Array #003 can resume powering the well pump”
Previously the well pump was a 420′ head, 240V unit ($$$). That was replaced with a 120′ head 120V unit (order of Magnitude cheaper).
The SPF 5000 ES offers only 230/240V natively. It requires a 50lb spool of wire (effectively) to generate a 5KW capabile Neutral. From that neutral we can tap 120V 1ph, as is normally found in US.
Note that I am working from a Phone in Alaska (cough) so I hyperlinked the text only and not the pictures. It only takes a second on a PC but on an Android it is “too many clicks”.
The links provided are the sources I down-selected on and NOT paid advertising. Signature Solar and Amazon.
…..
Where I left the project it has been validated to perform using SOOW 10AWG cable. You really want 8awg in conduit for install into infrastructure, 10AWG rated for 90C or 105C will suffice, but significant heat is generated If you encroach on the 2,500W maximum load imbalance.
You can run it all day on 10AWG THWN on 20A Homeline breakers but IF you start loading it down you WILL generate significantly more heat and the cables WILL come into the heat sinking calculations.
So LESSON 1
- Cables are heat sinks
- Modern Chinese Engineering includes this in the power rating / derating
- You need to actually load test to thermal soak on a 125F day to appreciate
O N W A R D
The dilemma is that the hardware is on site already and my “fixings” are here. My kit of AC is about a cubic yard, so what we call “a pallet”….
Lets start by getting the unit installed on the wall (over cement board) and then we can assess the required conduit size. 1/2″ or 3/4″ will work but unless we want to get out the hydraulic knockout…..
-Schindler