COVID-19:  We are open for business as normal but are not currently offering UK next-day shipping services. For full information on how COVID-19 is impacting ordering and deliveries, please click here

Votronic 12V StandBy Charger (Trickle Charger)

  (4 Reviews)
Price:  £26.72   (£22.27 Exc. VAT)

Product code:  P01899



Low stock

The Votronic StandBy Charger enables simultaneous trickle charging of your starter battery whilst your leisure / auxiliary battery is being charged from a mains charger, solar panel or generator. This is ideal if the charging source connected to your leisure battery has only one output, but you want to be able to provide a maintenance charge to your starter battery to keep it topped up.  Ideal for over-wintering campervans, motorhomes or boats.

Activation of the unit is automatic and it only operates when it senses a charging voltage at the leisure battery, keeping the batteries electrically separated otherwise. The amount of current diverted from the charging source will vary depending on the charging conditions but it is limited to 3A maximum. The starter battery cannot be over-charged because the charging voltage is reduced by 0.6V before reaching the starter battery.

Fitting is very easy and does not require any re-configuration of existing electrical systems. The unit simply needs small gauge cable and suitable fuses to be fitted between its terminals and the positive terminals of the two batteries. 

Suitable for use with lead-acid batteries only (not for use with lithium technology) where both batteries have a nominal system voltage of 12V.

Designed and manufactured in Germany with a 2 year manufacturer's warranty.

Further information

  • Use 1.5 - 2.5mm² cable with 10A fuses
  • Negative terminals of both batteries must be electrically connected (directly or indirectly)


  • System voltage: 12V DC
  • Output current: 3A max.
  • Battery types: Lead-acid only (flooded, sealed, AGM, gel etc.)
  • Working temperature: -20 to +40°C
  • Protection class: IP20
  • Overall dimensions: 90 (L) x 60 (D) x 38 (H) mm

Part Number:  C8451

Average Rating (4 Reviews):  
Write a Review and share your opinions!

Trickle charger
Wednesday, 22 July 2020  | 

This is a very effective piece of equipment.
I supply and fit these a lot for my clients as a means to keep their starter batteries full of charge when parked up off grid.
Excellent device.

Votronic - Does exactly what it says:
Thursday, 4 June 2020  | 

A simple device which works without intervention to 'share' any excess voltage in the leisure battery with the starter battery which often has a small voltage drain owing to the vehicle system's requirement. Fitting very simple - connect (via 10amp fuses at each battery connection point), to both leisure and starter battery positives with a 1.5/2.5mm single cable. Ideal where the vehicle is not being used during long stationary periods. Thoroughly recommend the device - a simple, zero-maintenance and effective solution.

Good product
Monday, 17 February 2020  | 

This trickle charger works well and was easy to fit. It seems expensive for quite a simple item but it does an invaluable job.

Does what is says on the tin
Tuesday, 15 October 2019  | 

Easy to fit and keeps my starter battery on standby voltage when the domestic battery is charged from the solar panel

Related Products
Single Core Thin Wall Cable - 2.0mm˛ 25A
From:  £0.60
Inline Splashproof Standard Blade Fuse Holder
From:  £2.14
Standard Blade Fuses
From:  £0.21