Same-basis comparison for a marine inverter charger
Quotes come from factories. Inverter Charger Sourcing only restates them on one ledger. A marine inverter charger brief usually adds wet-location enclosure, mounting orientation, cooling airflow and a listing edition such as UL 1741. Those extras change cost. If mounting, cooling or listing scope differs, the gap is a scope gap, not a market-discount figure. We have no same-basis price_comparisons file on this site, so we do not publish a percentage.
Comparable
- Stated continuous watts, surge watts and duration
- DC bus voltage, charger current in A DC and charge stages
- AC output voltage, phase, frequency and waveform
- Transfer relay amps and transfer time
- Quantity, packaging basis and requested delivery terms
- Listing standard and edition named on the same model number
Not comparable
- Unstated ambient or test conditions for the watt rating
- Different enclosure, mounting feet or drip-shield scope
- Internal MPPT versus external DC solar input versus AC coupling
- kVA labeled as kW without a power factor basis
- Any market price percentage claim without this site's quote evidence
- A series certificate used as if it covered the offered construction
If the specification moves after the first round, the changed lines must be re-quoted. A tighter efficiency claim at 25 °C and a conservative derating margin at 40 °C are not the same watt rating; the cheaper number may simply omit the hotter ambient. Likewise, a marine inverter charger quoted with a drip shield and one quoted as an open chassis are different mechanical scopes even when continuous watts match.
Protective-device arguments such as fuse versus circuit breaker, or SCCR and selective coordination of a panel, sit outside this comparison unless you asked those accessories to be included. We will not invent an interrupting-capacity figure for the inverter charger itself. Read option forms and the five questions we put to an offer.