Battery charging while parked.

[FNQ California]

Hi,
We're in Australia and have a 2020 California Beach. It's not a daily drive so I keep a trickle charger on the leisure battery when parked and had assumed this would overflow into the main battery (Australian imports don't have an external electric hookup fitted).
Started it today (it has been 5 months) and got a "main battery very low message". It charged OK whilst driving though.
My question is, do a need to use 2 trickle chargers, one for the main and one for the leisure, or if I connect to the main battery will it overflow into the leisure?
And if I were to use 2 chargers, might that lead to subsequent electrical problems?
Apologies if this is a dumb question, but electronics is a dark art to me.

 

[WelshGas]

Hi,
We're in Australia and have a 2020 California Beach. It's not a daily drive so I keep a trickle charger on the leisure battery when parked and had assumed this would overflow into the main battery (Australian imports don't have an external electric hookup fitted).
Started it today (it has been 5 months) and got a "main battery very low message". It charged OK whilst driving though.
My question is, do a need to use 2 trickle chargers, one for the main and one for the leisure, or if I connect to the main battery will it overflow into the leisure?
And if I were to use 2 chargers, might that lead to subsequent electrical problems?
Apologies if this is a dumb question, but electronics is a dark art to me.

Yes, you will need 2 chargers. Although the Leisure and engine battery/alternator are connected via a split charge relay this only occurs when the engine is running and there is an output from the alternator.

 

[dspuk]

Hi,
We're in Australia and have a 2020 California Beach. It's not a daily drive so I keep a trickle charger on the leisure battery when parked and had assumed this would overflow into the main battery (Australian imports don't have an external electric hookup fitted).
Started it today (it has been 5 months) and got a "main battery very low message". It charged OK whilst driving though.
My question is, do a need to use 2 trickle chargers, one for the main and one for the leisure, or if I connect to the main battery will it overflow into the leisure?
And if I were to use 2 chargers, might that lead to subsequent electrical problems?
Apologies if this is a dumb question, but electronics is a dark art to me.

Given the sun over there I’d think about a solar panel with a trickle charge to the starter via an appropriate MPPT. Even here in the UK I’ve never had to use a plug in trickle since we fitted a 150W panel, keeps everything tickety boo between trips.