Charge house battery without solar

No and No.

But if you get a battery isolator you can connect the house battery to the vans charging system.

WWW

OK, thank you. Was looking into getting a diode battery isolator, I guess I'll go with that instead

As WWW states No, because a Solar charge controller only works with solar. So using a DC power source will not work.

The best way to charge the house battery would be from the alternator using an isolator. That is the way most RV's charge the batteries.

a cheap diode isolator will leave your house battery nearly a volt undercharged (diode drop)

thezenvan,
The best ways to charge the RV's House Batteries is:
a) Solar Panels
b) Portable Generator
c) AC Charge Controller from a pedestal (if available).

All of the above devices are connected to the House Batteries via proper DC Disconnects and Overload Protection.

We do not ever use our engine alternator to charge the House Battery Bank because ...
a) The alternator's voltage is way too low, it takes forever to recharge the House Batteries and then they sulfate ( < 100% SOC )
b) You will run out of gasoline - now you are stranded !
c) You will accidentally leave a Manual Isolator Switch Closed while camping and you will kill your Starting Battery - now you are stranded !
d) During a long trip an Automatic Isolator Relay can boil your House Batteries = low electrolyte = bad news

The engine's alternator was not designed for a proper 3 Stage Charging of a Deep Cycle Battery Bank.
The Bulk Voltage will be way too low while camping.
And then the Float Voltage will be way too high while driving.

The Engine Starting Battery is charged via the engine's alternator and it is never, ever drained during camping.
Keep the two electrical systems completely separate, to prevent from being stranded.
You have been warned !!!

Yes, unless 3 diodes are used as a second + rectifier set, so both batteries see the same voltage. Bruce Roe

Uh. Actually my RV was designed so that the alternator can charge either my house battery system or the starter battery. I have measured the voltage and it is more than enough to do the job for either. My gas tank is also 75 gallon so I do not believe I will run out anytime just charging the batteries.

I can also use the RV's "on board" generator to do the job or plug into the grid or connect my solar charging system. They all work.

I understand your desire to warn someone that using the alternator may not work especially if the system is not properly designed for the batteries. But to say don't use an alternator to charge your house batteries is a little one sided and misleading.