Inverter component map

Component letters used throughout this guide match the wiring compartment map in the Sol-Ark 12K-2P installation manual (section 1.1, p.7).

Sol-Ark 12K-2P component map with labels A through N

Sol-Ark 12K-2P wiring compartment — component map (manual p.7)

Most common install issue: incorrect CT sensor wiring or placement

The current transformers (CTs) let the inverter measure grid and home-load current. If they land on the wrong pins, are reversed, clamp the wrong conductor, or are left off entirely, the inverter mis-reads current flow and the system health check goes red.

What the health check shows (CT fault)

Energy balance broken — measured solar vs. implied flows off ~25–35%.
Load CT under-reading — home load a fraction of contracted, reads zero, or stuck at a constant value.
Production feeds disagree — Sol-Ark pvPower vs. P-inv differ ~30%.
HM values read 0.0 while the home is drawing power.

A CT-related red has three root causes. Check them in this order:

Reference

Sol-Ark 12K-2P installation manual, “Limit Sensors” (p.20) and “Wiring the CT sensor” (p.21): CT1 (L1) → pins 3 & 4, CT2 (L2) → pins 5 & 6. See the pinout diagram below.

Sol-Ark manual: Wiring the CT sensor, CT1 to pins 3 and 4, CT2 to pins 5 and 6

Manual — Wiring the CT sensor: CT1 → pins 3 (white) & 4 (black), CT2 → pins 5 (white) & 6 (black)

Cause 1: incorrect wiring into the inverter

CT leads land on Component L, the 10-position input block: CT1 → pins 3 (white) & 4 (black), CT2 → pins 5 (white) & 6 (black). The pins are the same across models; on the 15K-2P the signal terminal sits in a slightly different spot on the board than the 12K-2P.

Correct wiring:

Sol-Ark 12K-2P field photo: CT leads correctly landed on pins 3 to 6 of component L

Correct Sol-Ark 12K-2P — CTs on pins 3–6

Sol-Ark 15K-2P: CT leads correctly landed on pins 3 to 6, white then black

Correct Sol-Ark 15K-2P — CTs on pins 3–6

Incorrect wiring: here the leads land on the right pins (3–6), but the polarity is reversed — the colors are swapped within each pair. They must be white on 3, black on 4, white on 5, black on 6 (CT1 white→3, black→4; CT2 white→5, black→6).

Polarity note: the CTs can stay inside the enclosure as long as they clamp the service conductors between the meter and the main panel (placement below). See the install diagrams on manual p.20.

Sol-Ark 15K-2P field photo: CT leads on correct pins but reversed polarity

Incorrect Sol-Ark 15K-2P — reversed polarity on pins 3–6

Cause 2: incorrect CT placement

The other common CT mistake is physical placement. The CTs must clamp the service conductors between the meter and the main panel, with the arrows pointing toward the meter (grid). Put them anywhere else (downstream of the panel, or below the inverter's connection point) and the inverter cannot separate grid flow from load, so import/export and zero-export control read wrong.

Sol-Ark CT placement: back-feed breaker vs line side tap, CTs between meter and main panel

CT placement — between the meter and the main panel, for both back-feed breaker and line-side-tap connections

The exact spot depends on how the Sol-Ark connects to the service:

Back-feed breaker. The inverter feeds the loads through a breaker inside the main panel. The CTs go on the single service conductor between the meter and the main panel, above the panel — so they measure net grid import/export for everything (house loads minus what the inverter back-feeds).
Line-side tap. The inverter taps the service conductor between the meter and the main breaker (upstream of the panel). The CTs must sit between the meter and that tap point — above where the inverter ties in — so they still see only the utility's grid flow, not the inverter's own output.

In both cases the rule is the same: the CTs belong on the utility conductors between the meter and wherever the inverter connects, arrows toward the meter.

Cause 3: CTs not installed

If the health check reports no home-load telemetry and Component L is empty, the CTs were never fitted. The Sol-Ark install manual requires them even on whole-home backup systems (they ship in the box), so fit and wire them per Cause 1.

Battery communication & grounding

When a battery is not wired correctly (comms in the wrong port, or the ground not made), the inverter cannot read the battery. The fault surfaces on the system health check, not as an obvious wiring error.

What the health check shows (battery fault)

No battery telemetry in window — comms/BMS cable not landed.
Battery not participating — grid imported with charge available (SOC above reserve, no energy moved).
Never charges or discharges — inverter will not use a battery it cannot see.

Both issues below produce this same result. Check the comms port and the ground first.

Renon

Common issue: the inverter comms cable must land in INV COM (RS485 + CAN). Landed in LINK IN/OUT (battery-parallel ports) instead → no battery telemetry.

Renon battery: comms cable wrongly in LINK IN, INV COM port empty

Deye

Common issue: on the Deye RW-F10.2 the incorrect install below has two faults at once:

Ground not made. The green PE wire must land on the middle grounding screw (the ⏚ bolt). Here it is left loose, so the battery has no earth bond.
Comms in the wrong port. The inverter comms cable must land in PCS (Inverter CAN/RS485). It is in IN (a battery-parallel port) instead, leaving PCS empty → no battery telemetry.