BLUETTI collection / Expansion & charging / D40 DC-DC Battery Charger
Manufacturer imagery from the supplied catalog. Bundle photographs may show separately purchased equipment.
RV house-battery charging · US offer
D40 DC-DC Battery Charger
DC-DC charger; AC200L-focused listing
Confirm exact host compatibility, included cables, price and dispatch date with BLUETTI.
Why this component
RV house-battery charging.
D40 connects a supported DC source to a compatible 12V house-battery or load setup. BLUETTI’s current listing highlights AC200L and supported LiFePO₄, AGM/gel, lead-acid and calcium batteries. The charging mode and battery profile matter as much as the product name.
What to check before buying
Start by identifying which device supplies energy and which receives it. An AC200L feeding an RV house battery is a different connection from a vehicle electrical system feeding the AC200L. Buying the wrong direction of charger can leave every connector on the plan wrong.
Connections & compatibility
Check compatible equipment and cables
| Part of the plan | What to verify |
|---|---|
| AC200L-powered path | Detailed table limits current to 20A in this mode |
| Load mode with AC200L | 12V / 20A in the detailed specification |
| Other charging modes | Headline 30A / 400W maximum must not be transferred to every input/mode |
| Battery profile | Correct chemistry-specific voltage and current settings must be verified |
This table identifies the checks that matter; it is not approval of a custom installation. Use the exact current model manuals and manufacturer confirmation where a connection or operating mode is unclear.
Product specifications
Key specifications
| Highlighted host | AC200L in the current US offer |
|---|---|
| 48V DC input specification | 45–60VDC |
| PV / starter input specification | 12–36VDC, 20A maximum |
| House-battery profiles listed | LiFePO₄, AGM/gel, lead-acid and calcium |
| Published warranty | One year, subject to current US terms |
Read this before ordering.
The detailed table, unlike the 30A headline, specifies 20A maximum with AC200L and other BLUETTI portable stations. Use the mode-specific figure. Have a qualified installer verify fusing, cable sizing, battery acceptance limits, grounding and installation instructions for the complete RV system.
Check what’s included
Confirm the exact product quantity, host-specific cable or adapter, required mounting parts and warranty conditions. An ecosystem photograph or a shared brand name does not establish that every shown component comes in the selected offer.
Sources and limitations
Sources and limitations
This guide follows BLUETTI’s current D40 technical table rather than treating the headline maximum as universal. AZSP has not bench-tested D40. Merchant reviews report mixed experiences; they do not establish an independent reliability rate or resolve compatibility for a particular installation.
Manufacturer & support
Contact BLUETTI customer support
BLUETTI supplies portable power stations, solar charging equipment and home energy products. Use its current US documentation to check accessories, operating limits and the configuration you select.
About BLUETTI →US customer support
+1 909-570-0909
Monday–Saturday, 6am–5pm PDT, as published by BLUETTI.
service@bluettipower.com
Current contact details · Manuals & support · Warranty terms
Before you choose
Will D40 provide 30A when powered by AC200L?
The current detailed specification lists 20A maximum for AC200L/other BLUETTI portable-station operation, and 12V/20A in load mode. Confirm the exact manual and mode before sizing the installation.
Compare related equipment
Charger 1 if the goal is charging a power station while driving →Sources & editorial notes
Checked October 26, 2026. Ratings are manufacturer claims. Any capacity or energy examples are AZSP calculations, not measured performance. Current prices, stock and final compatibility confirmation remain with the merchant.
Check Current Price & Availability ↗