Charger
Review how the Votronic StandBy-Charger Pro 3063 connects, how it operates and which installation requirements apply to this model.
Open this example as a new project. Use your own parts and cable lengths to make the plan yours.
The StandBy-Charger Pro requires its EN input to be driven as shown in the manual; DIS overrides that permission. Select the output voltage before connecting the destination battery, and include both banks’ protection and the complete enable wiring. A four-power-wire example would omit a required connection.
The StandBy-Charger Pro requires its EN input to be driven as shown in the manual; DIS overrides that permission. Select the output voltage before connecting the destination battery, and include both banks’ protection and the complete enable wiring. A four-power-wire example would omit a required connection.
Wiring diagram
Open this example in Crimp to use your own parts and cable lengths. Review the assumptions and installation notes as you adapt the circuit.
Manual PDF 2 specifies 15 A input and 10 A output fuses. 2.5 mm² permits 4.6 m total input and 7 m total output; 1 m each way fits. Set output voltage before connecting destination; EN required, DIS overrides. Manufacturer installation manual
Edit this connection overviewInstallation notes
Guidance for this model, with sources linked beside the relevant advice.
Verified against the manufacturer's documentation (rev. German operating instructions 07/2026, no. 3063), checked 2026-10-01. Manufacturer documentation →
StandBy-Charger Pro moves energy from one 12 V battery to another at up to 8 A output, with input draw up to 12 A. Both banks must be nominally 12 V; it is not a 24 V converter. Set the output voltage and input cutoff to suit the actual batteries and their BMS requirements. Its adjustable 12.5–14.5 V output must not be assumed suitable merely because a battery is sold as lithium. See ratings, PDF p. 1.
IN+ and IN− connect to the source bank; OUT+ and OUT− connect to the maintained bank. EN enables charging when supplied with the permitted 12 V control signal, or with the documented IN+-to-EN bridge. DIS overrides EN; connecting the vehicle D+ signal here can stop this charger while the alternator is charging the destination bank. The control terminals do not carry the charging output.
The manufacturer's cable table specifies a 15 A input fuse and 10 A output fuse. With 2.5 mm² wire, the maximum combined positive-plus-negative lengths are 4.6 m input and 7 m output. A one-metre positive and one-metre negative run on each side fits both limits. The removable screw terminals accept 1–4 mm² installation cable, stripped 6 mm and tightened to 0.5 Nm. The manual recommends stranded wire without ferrules for these terminals. See wiring and cable table, PDF p. 2 and terminal data, PDF p. 6.
Connect the input battery first. Set the input cutoff, enable the device, and adjust output voltage while measuring the unloaded output. Only then connect the output battery. Verify that DIS stops charging and that input undervoltage prevents unwanted discharge of the source bank. Recheck voltage at the destination battery under load; excessive cable drop can leave maintenance charging incomplete. See commissioning, PDF p. 3.
Build it out
Add StandBy-Charger Pro 3063 to your diagram, then connect your batteries, chargers and loads. Crimp calculates cable sizes and checks the connections as you draw.
Every cable you draw there is sized against ABYC E-11, from the same tables as the reference on this page.
Technical reference
Check the model, ratings and connection points against your own unit before choosing installation hardware.
Check stud sizes, fuse type, run length and how warm the space gets against the gear you actually have before you order.
Catalog connection points, current direction and planning limits. Check the manufacturer's pinout and connector ratings before installation.
IN +
in-pos
positive · input
IN −
in-neg
negative · input
OUT +
out-pos
positive · output
OUT −
out-neg
negative · output
EN
en
signal · bidi
DIS / D+
dis
signal · bidi
A dash means a current rating is not specified here.
Method & provenance
Manufacturer specifications describe the equipment. Crimp calculates cable results from the circuit and assumptions you enter.
From the maker
Manufacturer, model, ratings and which terminal does what come from the catalog. A newer revision, or the nameplate on the unit in your hand, can say something different — when it does, the nameplate wins.
ABYC E-11
Sized against ABYC E-11. Boats built to UK or EU rules answer to ISO 13297 — check these figures against it before you build. The run length and the current above are what drive the result. Crimp doesn't know how warm your space gets; draw the cable inside an engine-bay zone on the canvas and it sizes for the heat.
Next step
Open this example as a new project. Add your equipment and cable lengths, then review the sizing and checks for your setup.