12V Marine RV 14.6V 20A On-Board Charger
On-board charger for 12V marine and RV banks: 14.6V at 20A, then a float stage that holds 14.6-14.75V so it can stay connected between trips. 100-260V AC inp...
| Input Voltage | 100-240V AC |
|---|---|
| Output | 14.6V 20A |
| Efficiency | >88% |
| Protection | OVP/OCP/SCP/OTP |
A 292W-class car battery charger with a real float stage — 14.6V charging, 14.6–14.75V float. 100–260V AC input, 20A nominal, IEC60950-1 compliant. Designed, assembled and tested in our own 3,000 m² factory in Shenzhen.
Built by the factory, not a trading company
YZPOWER is a battery charger manufacturer. Since 2011 we have designed, assembled and tested chargers in our own Shenzhen facility — SMT lines, assembly zones, aging chambers and quality control all under one roof. Model YZ300-14.6V 20A is built, tested and shipped by the people who designed it.
Factory at a glance
Company · Shenzhen Yangzi Power Co., Ltd. (YZPOWER)
Address · Block F, Guo Sheng Industrial Park, No. 101 Jun Xing Road, Guan Lan, Long Hua New District, Shenzhen, China 518110
Established · 2011 — 15+ years in power electronics
Factory area · 3,000 m²
Monthly capacity · 150,000+ units
Manufacturing team · 120+ skilled technicians
In-house processes · SMT · assembly · aging · QC
Export markets · 55+ countries
Certifications held · 2 — CE (LVD), RoHS
Why this charger lasts
Chargers rarely fail because of the spec sheet. They fail because of heat, poor magnetics, and capacitors that were never meant for the temperature they run at. This design is specified around those three failure points.
The float stage — and why it decides how long your battery lasts
A lead-acid battery that is charged and then left on a fixed high output will gas, dry out and die early. This charger doesn't do that. After the main charge, output drops to a 14.6–14.75V float stage that holds the battery at full capacity without cooking it — which is the whole point of a lead-acid charging profile, and the reason a lithium charger cannot do this job.
That single line on the datasheet is the difference between a battery that lasts its rated life and one that comes back as a warranty claim.
Aluminum heat sink housing
The enclosure is the heat sink. Its fin geometry follows natural hot-air flow, so heat leaves the power devices by design rather than by luck.
Transformer with real power margin
An EC40 core in PC40 material: low iron loss from the material, real power capacity from the core size. The transformer runs with genuine headroom instead of at its ceiling under continuous 20A load.
Filter capacitors rated −40℃ to +80℃
Low impedance, long service life, stable across the full temperature range — selected for the environments your customers actually charge in.
Measured, not promised
Hold-up time ≥5 ms. Output ripple ≤2000 mVp-p at 25℃. Overshoot at turn-on/turn-off under 10% of rated output. Over-current protection at 22.2A. These are the acceptance limits this unit is tested to, not marketing targets.
1-year warranty. We build it, so we can stand behind it.
Technical specifications
Every value below is taken from the product's own Specification for Approval (model YZ300-14.6V 20A, Rev:A00). The signed document is available on request for your market approval file.
1. AC input
Input voltage · 100 Vac min · 110 Vac / 220 Vac nominal · 260 Vac max
Input frequency · 47 Hz min · 50 Hz / 60 Hz nominal · 63 Hz max
Inrush current · ≤50 A peak at rated input voltage, cold start at 25℃
Max input current · ≤5 A at minimum AC input, full load
Efficiency · >85% at rated input voltage, at typical and maximum load
2. DC output and charging profile
Battery type · 12V lead-acid — AGM, GEL and flooded all supported
Output voltage · 14.6 V (regulation range 14.5–14.7 V)
Float charge voltage · 14.6 – 14.75 V
Cross regulation · N/A (single output)
Charging current (CV mode) · min 18 A · nominal 20.0 A · max 22 A
Min battery voltage at nominal current · 10 V
Max battery voltage at nominal current · 12.6 V
Output ripple and noise · ≤2000 mVp-p max at 25℃ (measured at 20 MHz bandwidth, with 0.1 µF X7R + 10 µF low-ESR tantalum at the output)
Overshoot at turn-on / turn-off · <10% of rated output voltage
Output power · approx. 292 W (14.6 V × 20 A)
3. Charging indicator (LED)
State · LED · Condition
AC connected, idle · Green · Charging current <2 A
Charging · Red · Charging current >2 A
Charge finished · Green · Charging current <2 A
4 .Protection
Protection · Limit / behaviour · Recovery
Short circuit · Output impedance <0.1 Ω — protected, no damage to components or connectors · Automatic after fault removed
Over current · 22.2 A max · Automatic recovery after protection is removed
Over temperature · Stops output when internal temperature reaches 85℃ · Restarts output when temperature falls below 75℃
Over voltage · Provided · Automatic
5 .Timing
Hold-up time · ≥5 ms at 110 Vac/47 Hz and at 110/220 Vac/50/60 Hz, full load
Start-up time · ≤5 s at 110 Vac/47 Hz and ≤5 s at 110/220 Vac/50/60 Hz, full load
6. Environment
Parameter · Operating · Non-operating / storage
Ambient temperature · −10℃ ~ +40℃ · −40℃ ~ +85℃
Humidity · 25% ~ 90% RH (non-condensing) · 10% ~ 90% RH (non-condensing)
Altitude · 2000 m · 5000 m
7. Reliability and safety
MTBF · ≥50,000 hours (MIL-HDBK-217F; 25℃, full load, rated input)
Burn-in and life test · In-house 24–48 h full-load burn-in; extended life-test procedure agreed with the customer
Safety standard · IEC60950-1
Leakage current · ≤0.25 mA at 220 Vac / 50 Hz
Insulation resistance · Primary to secondary ≥50 MΩ @500 VDC
Dielectric strength (Hi-pot) · Primary to secondary 1500 Vac, <5 mA, no arcing, no breakdown — 100% production test, min. 3 s per item
8. Mechanical
Model · YZ300-14.6V 20A
Dimensions (L × W × H) · 164 × 95 × 56 mm
Net weight · 0.94 kg
Housing · Aluminum
Label · Produced to customer requirements
Input / output lines · Produced to customer requirements
9. Ordering
Minimum order quantity · 1 unit
Lead time · 10-15 working days after deposit confirmation
Sample lead time · 1–7 days after deposit payment is confirmed
Warranty · 1 year
10 .Standards applied during design verification
GB/T 2423.1 · GB/T 2423.2 · GB/T 2423.3 · GB/T 2423.4 · GB/T 2423.5 · GB/T 2423.6 · GB/T 2423.8 · GB/T 2423.10 · GB/T 2423.11 · GB/T 2423.22 · GB 4943-2003 · GB 17625.1-1998 · GB/T 17626.2 · GB/T 17626.4 · GB/T 17626.5 · GB/T 17626.11
What it charges
Application · Typical battery
12V car, van and light commercial vehicle batteries · 12V lead-acid
Automotive start-stop and auxiliary batteries · 12V lead-acid
RV, camper, caravan and marine house batteries · 12V lead-acid
12V solar and off-grid storage banks · 12V lead-acid
Golf cart and mobility scooter batteries · 12V lead-acid
Industrial and floor-machine batteries · 12V lead-acid
Not suitable for: lithium or LiFePO4 packs · — see the LiFePO4 version
All 12V lead-acid types are supported — AGM, GEL and flooded. Tell us which you use and we will confirm the profile for your order.
LiFePO4 version: need the same platform for a 4S LiFePO4 pack? See our LiFePO4 battery charger.
Custom builds for your battery pack
This is not a catalogue product. It is a charger built to one customer's battery specification — including the label and the input/output cables, which are produced to your requirements rather than ours.
Category · Item · What we can do
Electrical · Output voltage · 3.7V – 96V (1–23 series, or more on request)
Electrical · Output current · Configured to your battery
Electrical · Charging profile · Custom CV or multi-stage profile, including float
Electrical · Connector · GX16 · XLR · DC barrel · Anderson · your drawing
Electrical · Input plug · EU · UK · US · AU · CN
Mechanical · Housing material and colour · Per your specification
Mechanical · Cable length · Per your specification
Mechanical · Label and silkscreen · Per your specification
Mechanical · Packaging · Custom carton, gift box, carton marks
Development · New housing tooling · In-house mould development, quoted separately
Service · User manual · Customised to your language and market
Certifications, standards and compliance
Certifications held for the YZ300 series. Certificate numbers are given so you can verify them directly with the issuing bodies.
Certification · Certificate no. · Standard / directive · Issued
CE — LVD · ATJC210528529004472S · Directive 2014/35/EU · EN 60335-1:2012+A11:2014+A2:2016+A13:2017+A14:2019 · EN 60335-2-29:2004+A2:2012+A11:2018 · 09 Jun 2021
RoHS · ATJC23129853678965R · Directive 2011/65/EU (CE-RoHS) · 10 Dec 2023
This unit is designed and tested to IEC60950-1, with 100% production Hi-pot testing at 1500 Vac. Signed certificates and test reports are available for your market review.
If your market needs an additional approval, tell us which one — our engineering team will advise what is feasible before you commit to an order.
How we build and test every unit
1.SMT production
Automated high-speed surface-mount lines for precise component placement.
2.Assembly
Multi-stage assembly lines with real-time quality tracking.
3.Aging
Every unit goes through a 24–48 hour full-load burn-in in our aging chambers.
4. Quality control
Dedicated IQC, IPQC and OQC checkpoints using calibrated test equipment.
Before your order ships
Three inspection points — prepare-order, in-production and pre-packing. We then photograph the goods to your requirements and send you the tracking number.
Frequently asked questions
Are you a factory or a trading company?
We are a manufacturer. We have been building chargers in Shenzhen since 2011. Our 3,000 m² facility contains our own SMT lines, assembly zones, aging chambers and quality-control stations, with a monthly capacity of 150,000+ units. We welcome factory visits and third-party inspections.
Why does a lead-acid charger need a float stage?
Because a lead-acid battery that stays on a fixed high output after it is full will gas and dry out. The float stage drops the output to 14.6–14.75V and holds the battery at full capacity without overcharging it. Lithium chargers have no float stage, which is why they should not be used on lead-acid batteries.
Will it charge my AGM, GEL or flooded battery?
Yes — all three. This charger supports 12V lead-acid batteries of any type, including AGM, GEL and flooded. Bulk orders are produced to the charging profile agreed with you.
Can this charger charge a lithium or LiFePO4 battery?
No. This is a lead-acid charging profile. We build the same platform as a 4S LiFePO4 charger — see the LiFePO4 version.
What is the charging current?
20.0 A nominal in CV mode, with a minimum of 18 A and a maximum of 22 A. Over-current protection trips at 22.2 A.
Can you build the charger to our battery specification?
Yes — that is most of what we do. Output voltage, current, charging profile, connector type, housing, cable length, label and packaging are all produced to your specification.
What is the warranty?
1 year.
Can I test a sample before placing a bulk order?
Yes. Customers cover the sample cost and express freight. Samples ship in 1–7 days after deposit payment is confirmed.
How do you control quality?
Incoming material (IQC), in-process (IPQC) and outgoing (OQC) checkpoints using calibrated test equipment. Every unit goes through a 24–48 hour full-load burn-in, is Hi-pot tested at 1500 Vac at 100% of production, and your order runs through three inspections — prepare-order, in-production and pre-packing.
Will I see the goods before they ship?
Yes. We photograph the order according to your requirements and send you the tracking number before dispatch.
What certifications do your chargers hold?
CE (LVD certificate ATJC210528529004472S) and RoHS (certificate ATJC23129853678965R), covering the European Union. This unit is also designed and tested to IEC60950-1, with 100% production Hi-pot testing at 1500 Vac.
What is the MTBF?
≥50,000 hours, per MIL-HDBK-217F at 25℃, full load and rated input voltage.
Related models
Other chargers built for the same battery system, from the same factory: