Head to head
Enerdrive vs Redarc 40A DC-DC Battery Chargers
Both do the same job. The question is which one your boat is actually asking for — and on this site that is a number, not a preference.
| Enerdrive 40 A | Redarc 40 A | |
|---|---|---|
| Charge current | 40 A | 40 A |
| Price band | $590–$800 | $520–$720 |
| Best suited to | Certified installs where the paperwork matters as much as the amps. | A 90 A alternator feeding a 200–400 Ah bank — the commonest boat on this site. |
| Look elsewhere if | Budget is the binding constraint and the install is not going to survey. | You want alternator temperature sensing as standard rather than as an add-on. |
Enerdrive 40 A
The one that arrives with documentation an electrician can certify against, which on an insured boat is what you are buying.
Redarc 40 A
The unit most Australian installers fit without being asked, and the one whose wiring diagrams every auto-electrician already knows.
Sized for your boat
40 A
Charge current for a 400 Ah bank on a 90 A alternator
This is a ceiling, not a target. A charger larger than your alternator can sustain is the failure this whole page exists to prevent, so we list what fits at or under it — biggest first.
5 options fit — the first is the one we would fit
The honest answer
Size it first, then choose.
A head-to-head between two ratings is the wrong question if neither matches your boat. Work out what the boat needs, then pick between whatever meets it — which is usually a decision about support and documentation rather than about amps.
Before choosing Enerdrive 40 A and Redarc 40 A
Match the charger to the installed charging system
Check the input source, battery requirements and the alternator’s available continuous output under actual operating conditions. Include other engine electrical demand in the assessment. Maximum charger output is not a promise of output at every temperature or speed, and the design needs to account for control signals and protection behaviour as well as current.
Confirm specifications against the exact model and revision offered by the supplier. A listed price band is a planning reference; request a current written quote with installation and commissioning separated from equipment supply.