# UNI-T UT503PV Photovoltaic Insulation Resistance Tester, 125V-1000V, CAT II 1000V/CAT III 600V

**URL:** https://aio.lv/en/product--unit-ut503pv--12538999
**Data updated:** 2026-06-27 08:58 (EEST)
**Category:** Other goods
**Manufacturer:** Unit
**Manufacturer code:** UT503PV
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 471.45 €
**Prices and availability valid until:** 2026-07-28 23:59
**Price without VAT (21%):** 389.63 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--unit-ut503pv--12538999

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | Thursday | free |
| Pickup points | 07.07.2026 | 1.89 EUR |
| Courier delivery to door | 07.07.2026 | 4.99 EUR |

## Summary description

The UNI-T UT503PV is a specialized insulation resistance tester designed for photovoltaic systems. It features a selectable test voltage range from 125V to 1000V, ensuring precise diagnostics for solar installations. Rated CAT II 1000V and CAT III 600V, this device provides reliable safety and accuracy for professional electrical testing, maintenance, and troubleshooting of PV arrays and related electrical infrastructure.

## Long description

The UNI-T UT503PV is a professional-grade photovoltaic insulation resistance tester engineered for the precise diagnostics and maintenance of solar power systems. This versatile device allows for the measurement of insulation resistance in both live photovoltaic circuits and non-live electrical installations. With a selectable test voltage range from 125V to 1000V, it provides the flexibility needed for comprehensive testing of various solar arrays and electrical infrastructure. The unit is built to high safety standards, featuring CAT II 1000V and CAT III 600V ratings, ensuring reliable performance in demanding professional environments.
Advantages
The UT503PV stands out due to its specialized capability to perform insulation resistance measurements on energized photovoltaic systems up to 1000V DC. It integrates advanced features such as automatic voltage recognition for both AC and DC, a compare function for insulation resistance, and a stepping voltage mode for detailed analysis. The device is designed for efficiency, offering data storage for up to 1000 sets of readings and seamless data communication via USB or a dedicated Bluetooth app. Its robust construction, including an IP54 rating, ensures durability in field conditions, while the auto-discharge function and high-voltage alarm prioritize user safety during operation.
Suitable for
Testing insulation resistance in photovoltaic (PV) solar arrays
Maintenance and troubleshooting of solar power installations
Measuring insulation resistance in non-live electrical circuits
Verification of DC voltage up to 1000V and AC voltage up to 600V
Professional electrical inspections requiring data logging and analysis
This device is not intended for testing energized circuits where the voltage exceeds 1000V DC for PV systems or 25V for standard insulation resistance measurements. It should not be used in environments that exceed its IP54 protection rating or in conditions outside of its specified CAT safety categories.
Key specifications
Test voltage range: 125V, 250V, 500V, 1000V
Insulation resistance measurement: up to 4000MΩ
Voltage measurement: 5V to 1000V DC and 5V to 600V AC
Safety ratings: CAT II 1000V, CAT III 600V
Data storage: 1000 sets
Connectivity: USB and Bluetooth app support
Protection: IP54 (with cap closed)
Power source: 6 x LR6 AA alkaline batteries
To use the UT503PV, first ensure the device is powered on and the appropriate test mode is selected based on whether the circuit is live or non-live. Connect the provided test leads or MC4 adapters to the target system, ensuring secure contact. Select the desired test voltage and initiate the measurement. The device will automatically display the resistance values, and you can utilize the compare function or time measurement features for deeper diagnostics. Always review the high-voltage alarm indicators before disconnecting the leads to ensure the circuit has been safely discharged.
What to consider before purchase
Verify that your solar system voltage does not exceed the 1000V DC limit for PV testing.
Ensure the device's safety category (CAT II 1000V/CAT III 600V) matches your specific work environment requirements.
Consider the need for data logging, as this model supports USB and Bluetooth connectivity for reporting.
Check if the included accessories, such as the MC4 test leads, are compatible with your specific solar panel connectors.
Usage recommendations: Always inspect the test leads for any signs of damage before each use. Ensure the device is set to the correct measurement mode to avoid accidental damage to the unit or the system under test. When working with live PV systems, strictly adhere to the 1000V DC limit and ensure the device is properly grounded where required.

## FAQ

### How much does the UNI-T UT503PV Photovoltaic Insulation Resistance Tester cost, and is it available for purchase?

The price is 471.45 € (valid at the time of publication and already includes all taxes). The item is available for order — 1 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on Thursday at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

### Can UNI-T UT503PV Photovoltaic Insulation Resistance Tester be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Unit products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Unit service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/12538999/68904207_large.webp