This is the 300 Amp current transformer (CT) that Sol-Ark uses on its 15K and 18K inverter systems to measure grid or load current. If your Sol-Ark 15K/18K is throwing CT-related fault codes, or you're building out a new install and need the correct-size CT for accurate metering, this is the part you need.
A current transformer is a low-voltage sensing device, but it still has to be sized and installed correctly, because an undersized or mismatched CT produces inaccurate readings that cascade into inverter metering errors, incorrect grid/load calculations, and nuisance fault codes. Sol-Ark's 15K and 18K platforms are built around this specific 300A CT, so matching it to the correct inverter matters as much as matching wire gauge to ampacity. Note: If you would like to review the manufacturer Product Specifications, Warranty, Brochure, etc., for this system, please refer to the "Resources (System Manuals and Warranty)" Tab above on this page.
- Ampacity rating: 300A
- Designed for: Sol-Ark 15K and 18K inverters
- Part type: Current Transformer (CT), used for grid/load current sensing
- Does NOT fit: Sol-Ark inverter models outside the 15K/18K family are not confirmed in current data [NEEDS VERIFICATION] — do not assume fitment on 8K, 12K, or 30K units without checking with Sol-Ark first
- Not rated to exceed: 300A continuous current measurement
A CT that's clamped loosely around the conductor, or installed with the wrong orientation relative to current flow, gives you inaccurate current readings — and on a Sol-Ark 15K/18K, that shows up as erratic grid/load values or a CT fault code, not a clean failure. Confirm polarity and seating before you close up the panel; a mis-oriented CT reads current backwards and skews the inverter's export/import logic, which over time can mask a real overcurrent condition rather than catch one. Verify actual current draw with a clamp meter against what the inverter display reports before you sign off on the install. This kind of verification step aligns with the same diligence NEC expects for any current-sensing or metering equipment tied into a service entrance — don't treat the CT as "set and forget."
- Matched specifically to Sol-Ark's 15K/18K CT input specification, not a universal aftermarket clamp CT
- 300A rating supports full-range current sensing on these inverter platforms without derating guesswork
- Correct fitment reduces the risk of CT-related fault codes and metering drift
- Straightforward field replacement part for CT failure or troubleshooting on affected inverters
| Spec | Value | Unit |
|---|---|---|
| Ampacity Rating | 300 | A |
| Compatible Inverters | 15K, 18K | Sol-Ark model |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
- Fits: Sol-Ark 15K inverter
- Fits: Sol-Ark 18K inverter
- Does NOT fit: Other Sol-Ark inverter models (8K, 12K, 30K, etc.) are not confirmed compatible with this 300A CT [NEEDS VERIFICATION]
- Not rated to exceed: 300A continuous current
| Category | Detail |
|---|---|
| UL Listing | [NEEDS VERIFICATION] |
| IP Rating | [NEEDS VERIFICATION] |
| NEC Reference | Refer to CT/metering installation guidance in manufacturer documentation |
FAQ
What size CT is this?
This is a 300 Amp current transformer (CT), sized specifically for Sol-Ark 15K and 18K inverters.
Will this CT work with the Sol-Ark 12K or 8K inverter?
Sol-Ark specifies this 300A CT for the 15K and 18K inverters. Fitment on the 8K or 12K is not confirmed in current manufacturer data, so check with Sol-Ark or MSSD before ordering for those models.
Is this CT rated for 48V battery systems?
The CT measures AC current on the grid or load conductor, not DC battery voltage, so it is not a "voltage-rated" component in that sense. It is matched to the 15K/18K inverter's CT input specification.
Can I use this CT to exceed 300A of continuous measurement?
No. This CT is rated for 300 Amps. Do not use it on circuits or measurement points that exceed that rating.
Warranty & Registration: Manufacturer warranty terms for this CT are not included in the data provided [NEEDS VERIFICATION]. Please refer to the "Resources (System Manuals and Warranty)" Tab above on this page for full warranty documentation, or contact us before you order if you have questions — we always reply back.
