PowerMax PM3-55LK
#4 in StandaloneFull review
A low cost standalone converter for owners who are comfortable setting a charge voltage by hand. A common budget replacement for a WFCO 9855 class unit.
Amazon $137$137
The PowerMax PM3-55LK is the better RV converter charger overall, rated 3.6 to 3.2. The PowerMax PM3-55LK leads on value. The WFCO WF-9865-AD wins on output. The PowerMax PM3-55LK costs $167.99 less ($137 vs $304.99).
WFCO WF-9865-AD
#8 in StandaloneFull review
An easy drop in for an RV that already has a WFCO 9800 deck mount, with lithium detection built in. Pick it for a big battery bank if you can give it a 20 A outlet.
Amazon $304.99$304.99
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 PM3-55LK for value ($2.49 per amp ($137, 55 A) vs $4.69 per amp ($304.99, 65 A)).
- Choose the WFCO WF-9865-AD for output (65 A vs 55 A).
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 PM3-55LK | WFCO WF-9865-AD |
|---|---|---|
| Overall rating | 3.6/5 | 3.2/5 |
| Value 35% | 70 $2.49 per amp ($137, 55 A) | 32 $4.69 per amp ($304.99, 65 A) |
| Output 10% | 50 55 A | 70 65 A |
| Features 30% | 80 lithium mode, multi-stage charging, fan runs only as needed | 80 lithium mode, multi-stage charging, fan runs only as needed |
| Warranty 25% | 25 2-year warranty | 25 2-year warranty |
Specifications
| PowerMax PM3-55LK | WFCO WF-9865-AD | |
|---|---|---|
| Charging | ||
| Output | 55 A | 65 A |
| Lithium mode | Yes | Yes |
| Multi-stage charging | Yes | Yes |
| Build | ||
| Build | Standalone | Standalone |
| Fan runs only as needed | Yes | Yes |
| Remote or display | No | No |
| Weight | 7 lb | 6.2 lb |
| Warranty | 2 years | 2 years |