PowerMax PM4-100
#1 in StandaloneFull review
A low cost standalone converter for owners who are comfortable setting a charge voltage by hand. Its high output suits a large lithium bank.
Amazon $189$189
The PowerMax PM4-100 is the better RV converter charger overall, rated 4.0 to 3.0. The PowerMax PM4-100 leads on value and features. The PowerMax PM4-100 costs $190.99 less ($189 vs $379.99).
IOTA DLS-90/IQ4
#11 in StandaloneFull review
A rugged, regulated converter for owners who value clean DC power and want to add the right charge controller themselves. The built in IQ4 makes it a complete lead acid charger.
Amazon $379.99$379.99
Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the PowerMax PM4-100 for value ($1.89 per amp ($189, 100 A) vs $4.22 per amp ($379.99, 90 A)) and features (lithium mode, multi-stage charging, fan runs only as needed vs multi-stage charging, fan runs only as needed).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every standalone RV converter charger; a clear win is highlighted. How we rank explains each one.
| Factor weight | PowerMax PM4-100 | IOTA DLS-90/IQ4 |
|---|---|---|
| Overall rating | 4.0/5 | 3.0/5 |
| Value 35% | 86 $1.89 per amp ($189, 100 A) | 38 $4.22 per amp ($379.99, 90 A) |
| Output 10% | 100 100 A | 100 90 A |
| Features 30% | 80 lithium mode, multi-stage charging, fan runs only as needed | 40 multi-stage charging, fan runs only as needed |
| Warranty 25% | 25 2-year warranty | 25 2-year warranty |
Specifications
| PowerMax PM4-100 | IOTA DLS-90/IQ4 | |
|---|---|---|
| Charging | ||
| Output | 100 A | 90 A |
| Lithium mode | Yes | No |
| Multi-stage charging | Yes | Yes |
| Build | ||
| Build | Standalone | Standalone |
| Fan runs only as needed | Yes | Yes |
| Remote or display | No | No |
| Weight | 9 lb | 7.8 lb |
| Warranty | 2 years | 2 years |