# How to charge my two engine separate batteries with the servitude battery?

**URL:** <https://community.victronenergy.com/t/how-to-charge-my-two-engine-separate-batteries-with-the-servitude-battery/49133>\
**Category:** Q&A and troubleshooting\
**Tags:** dc-dc\_charger, marine, beginner\
**Created:** [23 November 2025 12:20 UTC](https://community.victronenergy.com/t/how-to-charge-my-two-engine-separate-batteries-with-the-servitude-battery/49133 "2025-11-23T12:20:25Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![DirkW](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/dirkw/32/33865_2.png) [@DirkW](https://community.victronenergy.com/u/DirkW)\
**Post date:** [23 November 2025 13:43 UTC](https://community.victronenergy.com/t/how-to-charge-my-two-engine-separate-batteries-with-the-servitude-battery/49133/5 "2025-11-23T13:43:05Z")

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Unfortunately, I misunderstood your question.

How high is the voltage on the service battery?

If it’s just a matter of trickle charging over the winter, then the solution could work.

Please use the translation function

> [@Campervan: Erhaltungsladung der Starterbatterie](https://community.victronenergy.com/t/campervan-erhaltungsladung-der-starterbatterie/43198):
>
> Hallo in die Runde in einem Campingfahrzeug mit Victron Komponenten (Orion XS, Smart Solar MPPT, Blue Smart IP22 Charger, Smart Battery Sense im VE.Smart Networking ) soll die Starterbatterie (PB) durch die Solaranlage, welche an der Aufbaubatterie (LiFePO4) angeschlossen ist mitgeladen werden. Die auf dem Markt verfügbaren Standby-Lader bedingen entweder den Austausch des Solarladereglers, bzw. Ladeboosters und /oder sind recht unflexibel und teuer. Ein passende Lösung konnte ich bei Victron …

 ![grafik](https://europe1.discourse-cdn.com/victron/original/3X/c/e/ce318545aca04e3d7a495276bed3ebb0ed787ddf.jpeg)

Another solution that comes to mind would be to connect one of the MPPT devices to the Agrofets input for the winter months, perhaps with a smart battery sense.

However, these are all solutions that require a certain amount of expertise in planning and installation. On the other hand, they are also very inexpensive.

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