Rigol DL3021
A well-supported programmable load for testing power supplies and batteries in an electronics lab.
Amazon $549$549
The Rigol DL3021 is the better bench power supply overall, rated 3.8 to 3.1. The Rigol DL3021 leads on output quality and protection & features. The OWON OEL8511 wins on value. The OWON OEL8511 costs $150 less ($399 vs $549).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
OWON OEL8511
A programmable 200 W load for benches that may later gang several units on RS485.
Amazon $399$399
Which should you buy?
- Choose the Rigol DL3021 for output quality (15 kHz dynamic mode vs 5 kHz dynamic mode) and protection & features (over-voltage protection, over-current protection, remote sense vs over-voltage protection, over-current protection).
- Choose the OWON OEL8511 for value ($2 per watt ($399, 200 W rated) vs $2.75 per watt ($549, 200 W rated)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every electronic loads bench power supply; a clear win is highlighted. How we rank explains each one.
| Factor weight | Rigol DL3021 | OWON OEL8511 |
|---|---|---|
| Overall rating | 3.8/5 | 3.1/5 |
| Value 25% | 17 $2.75 per watt ($549, 200 W rated) | 26 $2 per watt ($399, 200 W rated) |
| Output quality 20% | 80 15 kHz dynamic mode | 47 5 kHz dynamic mode |
| Resolution 15% | 75 1 mV / 1 mA setting resolution | 75 1 mV / 1 mA setting resolution |
| PC control 15% | 80 USB, RS232 with SCPI | 80 USB, RS232, RS485 with SCPI |
| Protection & features 10% | 80 over-voltage protection, over-current protection, remote sense | 60 over-voltage protection, over-current protection |
| Warranty 15% | 100 3-year warranty | 0 warranty not published, scored as none |
Specifications
| Rigol DL3021 | OWON OEL8511 | |
|---|---|---|
| Output | ||
| Type | Electronic load | Electronic load |
| Channels | 1 | 1 |
| Channel ratings | 150 V/40 A, 200 W | 150 V/20 A, 200 W |
| Max voltage | 150 V | 150 V |
| Max current | 40 A | 20 A |
| Rated power | 200 W | 200 W |
| Dynamic mode | 15 kHz | 5 kHz |
| Load modes | CC, CV, CR, CP | CC, CV, CR, CP |
| Precision | ||
| Setting resolution | 1 mV / 1 mA | 1 mV / 1 mA |
| Readback resolution | 1 mV / 1 mA | 1 mV / 0.1 mA |
| Remote sense | Yes | - |
| Control | ||
| PC interfaces | USB, RS232 | USB, RS232, RS485 |
| SCPI | Yes | Yes |
| Over-voltage protection | Yes | Yes |
| Over-current protection | Yes | Yes |
| Build | ||
| Weight | 16.7 lb | 9.3 lb |
| Warranty | 3 years | - |