Manufacturer and seller images. Configuration examples may include additional equipment.
Image source: Renogy 12V 40A DC to DC Battery Charger, manufacturer product photograph from the Renogy product pageRenogy's ordering code for the 40A variant of the 20A/40A page, printed as the page's default SKU and listed in the page's product data.
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentOfficial product page: Renogy storefront product data for the 12V 20A/40A DC to DC Battery Charger (September 23, 2026 capture) Checked · Earlier documentLocation: Identity block, SKU line
Documented
Renogy's rated output power; no output voltage is stated beside it.
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentLocation: ELECTRICAL DATA, Output Power
Documented
Printed as "Weight 4.14 lb (1.88 kg)".
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentLocation: General data, Weight
Documented
Printed as "Step 4. Connect the Battery Charger to a Starter Battery"; the guide covers RBC20D1U and RBC40D1U together and prints no solar input.
Official document: Renogy 12V 20A/40A DC-DC Battery Charger Quick Guide (RBC20D1U-G1/RBC40D1U-G2), version A4, April 15, 2025 Rev A4 · April 15, 2025 · Checked · Earlier documentLocation: PDF page 14, Step 4
Documented
Printed as "9.31 in (236.5 mm)x6.00 in (152.5 mm)x2.30 in(58.4 mm)", read in that order as width, depth and height.
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentLocation: General data, Dimensions
Calculated
Printed as "Communication Protocol RS485 Communication". The page's description mentions Bluetooth and the DC Home app, while its FAQ says communication needs the separately sold BT-2 Bluetooth module; whether this code has Bluetooth built in is not settled by the page, so only RS485 is recorded.
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentLocation: General data, Communication Protocol
Documented
Printed as "Alternator Input Voltage Traditional Alternator: 13.2-16.0VDC Smart Alternator (Euro 6): 12-16.0VDC".
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentLocation: ELECTRICAL DATA, Alternator Input Voltage
Documented
Renogy's maximum output current rating. The page states the charger adjusts output power in high temperatures; no derating curve is published.
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentLocation: ELECTRICAL DATA, Maximum Output Current Rating
Documented
Printed as "Step 5. Install a IGN Signal Wire (for Smart DC Alternator)"; shared guide for RBC20D1U and RBC40D1U (traditional alternators need no IGN connection, PDF page 14).
Official document: Renogy 12V 20A/40A DC-DC Battery Charger Quick Guide (RBC20D1U-G1/RBC40D1U-G2), version A4, April 15, 2025 Rev A4 · April 15, 2025 · Checked · Earlier documentLocation: PDF page 16, Step 5
Documented
Renogy's rated output power; no output voltage is stated beside it.
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentLocation: ELECTRICAL DATA, Output Power
Documented
Printed as "Weight 4.14 lb (1.88 kg)".
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentLocation: General data, Weight
Documented
Printed as "Step 4. Connect the Battery Charger to a Starter Battery"; the guide covers RBC20D1U and RBC40D1U together and prints no solar input.
Official document: Renogy 12V 20A/40A DC-DC Battery Charger Quick Guide (RBC20D1U-G1/RBC40D1U-G2), version A4, April 15, 2025 Rev A4 · April 15, 2025 · Checked · Earlier documentLocation: PDF page 14, Step 4
Documented
Printed as "9.31 in (236.5 mm)x6.00 in (152.5 mm)x2.30 in(58.4 mm)", read in that order as width, depth and height.
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentLocation: General data, Dimensions
Documented
Printed as "Communication Protocol RS485 Communication". The page's description mentions Bluetooth and the DC Home app, while its FAQ says communication needs the separately sold BT-2 Bluetooth module; whether this code has Bluetooth built in is not settled by the page, so only RS485 is recorded.
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentLocation: General data, Communication Protocol
Documented
Printed as "Alternator Input Voltage Traditional Alternator: 13.2-16.0VDC Smart Alternator (Euro 6): 12-16.0VDC".
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentLocation: ELECTRICAL DATA, Alternator Input Voltage
Documented
Renogy's maximum output current rating. The page states the charger adjusts output power in high temperatures; no derating curve is published.
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentLocation: ELECTRICAL DATA, Maximum Output Current Rating
Documented
Printed as "Step 5. Install a IGN Signal Wire (for Smart DC Alternator)"; shared guide for RBC20D1U and RBC40D1U (traditional alternators need no IGN connection, PDF page 14).
Official document: Renogy 12V 20A/40A DC-DC Battery Charger Quick Guide (RBC20D1U-G1/RBC40D1U-G2), version A4, April 15, 2025 Rev A4 · April 15, 2025 · Checked · Earlier documentLocation: PDF page 16, Step 5
Documented
Printed as "System Voltage 12V-12V": a 12V starter battery charging a 12V house battery.
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentLocation: ELECTRICAL DATA, System Voltage
Documented
Printed as "Charging Efficiency 94%" with no load point or test condition.
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentLocation: ELECTRICAL DATA, Charging Efficiency
Documented
Renogy's list, printed separated by slashes.
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentLocation: General data, Protection
Documented
Printed as "Battery Types AGM, Gel, Flooded, Lithium-iron Phosphate，User"; "User" is a custom charging mode.
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentLocation: ELECTRICAL DATA, Battery Types
Documented
Printed as "-4℉ -122℉ /-40 ℃ - 85℃". The Celsius figures are recorded; the Fahrenheit figures printed beside them repeat the operating range and do not agree.
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentLocation: General data, Storage Temperature Range
Documented
Printed as "-4℉ -122℉ /-25 ℃ - 60℃". The Celsius figures are recorded; the Fahrenheit figures printed beside them (-4 to 122 °F, which is -20 to 50 °C) do not agree with them.
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentLocation: General data, Operating Temperature Range
Documented
Recorded exactly as Renogy prints it. No certificate, test report or issuer record is linked, and none was checked.
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentLocation: General data, Certification
Documented
Published claims and calculations, not independent test results.
Location: Renogy limited warranty, all products
Retrieved
Renogy company-wide limited warranty schedule covering all product families; it does not state electrical or mechanical specifications for any individual SKU.
Archived copy of a document published by Renogy. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived copy, unaltered, kept as a record of what Renogy published. Original address: https://cdn.shopify.com/s/files/1/0631/0137/0483/files/RNG-4-243_Limited_warranty_A7_ALL_ac847cf3-801a-4727-8945-626d83ebe543.pdf?v=1777020452. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 2a0b55e50a32ed3fcd20fec1372c4229d11b547884d6c19725c1246400d59b78
Location: Identity block "SKU: RBC40D1U-US"; Specs tab "12V 40A DC to DC Battery Charger" general data and "ELECTRICAL DATA" table; Warranty Information
Retrieved
Renogy's own product page for the 12V 20A/40A DC to DC battery charger, captured byte for byte on September 23, 2026. The page sells two variants, 40A (RBC40D1U-US, shown by default) and 20A (RBC20D1U-US); its visible specification table is the 40A one and names the model RBC40D1U. Figures for the 20A variant are read from Renogy's separate 20A page instead. It is a store page, not a signed datasheet: Renogy prints no revision or test conditions beside its figures, and the certifications it names are manufacturer claims that no issuer record was read against.
Earlier revisions, archived captures and copies published by someone other than the manufacturer. Every one stays reachable.
Location: Cover "Renogy 12V 20A/40A RBC20D1U-G1/RBC40D1U-G2 QUICK GUIDE"; page 3 dimension drawings
Retrieved
The quick guide the 20A/40A DC to DC charger page links, fetched from Renogy's own content delivery host on September 23, 2026. It covers both chargers under the model names RBC20D1U-G1 and RBC40D1U-G2 and gives dimension drawings, recommended fuse and cable sizes and app setup. It is attached as the manufacturer document; no figure in this manifest is read from it except where a spec cites it.
Archived copy of a document published by Renogy. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived copy, unaltered, kept as a record of what Renogy published. Original address: https://cdn.shopify.com/s/files/1/0631/0137/0483/files/QG_RENOGY_2012V_2020A40A_20Battery_20Charger_A0.pdf?v=1752026840. Copyright and takedown
Printed revision date: 2025-04-15
Embedded dates are file metadata, not independent proof of publication.
SHA-256: e77cabfc0066d5bd6f3bc25674b660146eee05944735c2aeee11040179fba90c
Archived copy of a document published by Renogy. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived copy, unaltered, kept as a record of what Renogy published. Original address: https://cdn.shopify.com/s/files/1/0631/0137/0483/files/QG_RENOGY_2012V_2020A40A_20Battery_20Charger_A0.pdf?v=1752026840. Copyright and takedown
Printed revision date: 2025-04-15
Embedded dates are file metadata, not independent proof of publication.
SHA-256: e77cabfc0066d5bd6f3bc25674b660146eee05944735c2aeee11040179fba90c
Archived copy of a document published by Renogy. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived copy, unaltered, kept as a record of what Renogy published. Original address: https://cdn.shopify.com/s/files/1/0631/0137/0483/files/RNG-4-243_Limited_warranty_A7_ALL_ac847cf3-801a-4727-8945-626d83ebe543.pdf?v=1777020452. Copyright and takedown
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 2a0b55e50a32ed3fcd20fec1372c4229d11b547884d6c19725c1246400d59b78
Printed as "Renogy will, at its option, either repair the defective product or replace it with a new or refurbished product of equal or greater performance and reliability." in the Renogy Limited Warranty (RNG-4-243, rev. A7), Page 1, Limited Warranty for All, captured on September 26, 2026.
Official warranty: Renogy Limited Warranty (RNG-4-243 rev. A7) Checked · Earlier documentLocation: Page 1, Limited Warranty for All
Documented
Printed as "This warranty extends only to the original Purchaser. If gifted or resold the customer must go through the original Purchaser in order to claim warranty." in the Renogy Limited Warranty (RNG-4-243, rev. A7), General Conditions for Warranty Claims, captured on September 26, 2026.
Official warranty: Renogy Limited Warranty (RNG-4-243 rev. A7) Checked · Earlier documentLocation: General Conditions for Warranty Claims
Documented
Printed as "The warranty does not cover failures and damages that result from normal wear and tear, improper installation, operation, and storage" in the Renogy Limited Warranty (RNG-4-243, rev. A7), Exclusions and Limitations, captured on September 26, 2026.
Official warranty: Renogy Limited Warranty (RNG-4-243 rev. A7) Checked · Earlier documentLocation: Exclusions and Limitations
Documented
Printed as "The warranty is in effect from the date of purchase by the user" in the Renogy Limited Warranty (RNG-4-243, rev. A7), Page 1, Limited Warranty for All, captured on September 26, 2026.
Official warranty: Renogy Limited Warranty (RNG-4-243 rev. A7) Checked · Earlier documentLocation: Page 1, Limited Warranty for All
Documented
Printed as "Material and workmanship warranty 2-year". Renogy's page links its general limited warranty document for the terms; that document was not read for this record.
Official product page: 12V 20A/40A DC to DC Battery Charger | Renogy US (September 23, 2026 capture) Checked · Earlier documentLocation: WARRANTY INFORMATION
Documented
Printed as "This warranty does not cover labor." in the Renogy Limited Warranty (RNG-4-243, rev. A7), General Conditions for Warranty Claims and Exclusions and Limitations, captured on September 26, 2026.
Official warranty: Renogy Limited Warranty (RNG-4-243 rev. A7) Checked · Earlier documentLocation: General Conditions for Warranty Claims and Exclusions and Limitations
Documented
No sellers found. Maker list price $186.99, as of .
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No certificates on file. Certificate guide
No sourced accessories or replacement parts listed yet.
Manufacturer SKU RBC40D1U-US · US market
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† Maker's own price, dated on the product, because no seller price is on file. Not a seller price. No buy link.
