OWON SPE3051
#4 in Single outputFull review
A small programmable 30 V, 5 A supply for electronics hobbyists who want PC control in a compact box.
Amazon $119.99$119.99
The OWON SPE3051 is the better bench power supply overall, rated 3.2 to 3.0. The OWON SPE3051 leads on protection & features. The NICE-POWER R-SPS3020 30V 20A wins on value. The OWON SPE3051 costs $22.50 less ($119.99 vs $142.49).
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.
NICE-POWER R-SPS3020 30V 20A
#10 in Single outputFull review
A high-current 30 V switcher for automotive, battery and plating work that needs 20 A without a big bill.
Amazon $142.49$142.49
Which should you buy?
- Choose the OWON SPE3051 for protection & features (over-voltage protection, over-current protection, stored setups vs over-voltage protection, over-current protection).
- Choose the NICE-POWER R-SPS3020 30V 20A for value ($0.24 per watt ($142.49, 600 W rated) vs $0.80 per watt ($119.99, 150 W rated)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every single output bench power supply; a clear win is highlighted. How we rank explains each one.
| Factor weight | OWON SPE3051 | NICE-POWER R-SPS3020 30V 20A |
|---|---|---|
| Overall rating | 3.2/5 | 3.0/5 |
| Value 25% | 52 $0.80 per watt ($119.99, 150 W rated) | 87 $0.24 per watt ($142.49, 600 W rated) |
| Output quality 20% | 45 3 mVrms ripple and noise | 0 ripple and noise not published, scored as the worst |
| Resolution 15% | 50 10 mV / 1 mA setting resolution | 50 10 mV / 1 mA readback resolution |
| PC control 15% | 80 USB with SCPI | 50 PC control not published (neutral score used) |
| Protection & features 10% | 80 over-voltage protection, over-current protection, stored setups | 60 over-voltage protection, over-current protection |
| Warranty 15% | 0 warranty not published, scored as none | 0 warranty not published, scored as none |
Specifications
| OWON SPE3051 | NICE-POWER R-SPS3020 30V 20A | |
|---|---|---|
| Output | ||
| Type | Power supply | Power supply |
| Regulation | Switching | Switching |
| Channels | 1 | 1 |
| Channel ratings | 30 V/5 A | 30 V/20 A |
| Max voltage | 30 V | 30 V |
| Max current | 5 A | 20 A |
| Rated power | 150 W | 600 W |
| Ripple and noise | 3 mVrms / 30 mVp-p | - |
| Precision | ||
| Setting resolution | 10 mV / 1 mA | - |
| Readback resolution | 10 mV / 1 mA | 10 mV / 1 mA |
| Control | ||
| PC interfaces | USB | - |
| SCPI | Yes | - |
| Stored setups | 4 | - |
| Over-voltage protection | Yes | Yes |
| Over-current protection | Yes | Yes |
| Build | ||
| Weight | 3.3 lb | 6.6 lb |