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Engine running for lifting/dropping roof.
Posted: Thu Oct 29, 2015 4:06 pm
by sotal
Just checking...
The manual says about only lifting and dropping the roof when the engine is running.
Is it powered from the LB or the SB. I'm guessing SB?
It just got me wondering when we were on hookup with the LB being charged from the mains. As I say I presume it is the SB that powers it?
Also is there any issue with running the engine whilst on EHU? My only worry was that the LB is being charged from both the built in mains charger and the alternator (through the split charge) at the same time - is this an issue? Only time it tends to happen is when raising or dropping the roof.
Thanks
Re: Engine running for lifting/dropping roof.
Posted: Thu Oct 29, 2015 8:24 pm
by g8dhe
No it is powered from the SB and the alternator, it needs the extra power that the alternator provides, especially when the hardware is getting older.
Re: Engine running for lifting/dropping roof.
Posted: Thu Oct 29, 2015 9:45 pm
by sotal
That is what I presumed. Thanks for confirming!
How about the EHU charging the LB and the alternator charging the LB - is that a problem?
Re: Engine running for lifting/dropping roof.
Posted: Thu Oct 29, 2015 9:48 pm
by Bob
You'll need a long lead if you plan to drive while on hook up.
Sorry.
Re: Engine running for lifting/dropping roof.
Posted: Thu Oct 29, 2015 10:21 pm
by sotal
It's only when lowering and raising the roof. It just made me think about it as I was plugged in for EHU and then started the engine. In my mind it didn't seem a good idea to have the EHU running to the Supercharger, charging the battery at the same time as the alternator charging the battery.
Then as I thought about it more I figured it wasn't much different to when you jump start a car and leave the leads on for a few minutes - at that point you have both alternators charging with no harm.
Re: Engine running for lifting/dropping roof.
Posted: Thu Oct 29, 2015 10:46 pm
by Bob
I'm no expert, but I'd agree with that.
Low trickle charge from the EHU plus the regulators should reduce charge as required.
Re: Engine running for lifting/dropping roof.
Posted: Thu Oct 29, 2015 10:53 pm
by sotal
The built in charger charges at up to 12 Amps - but I guess the theory is the same.
Re: Engine running for lifting/dropping roof.
Posted: Thu Oct 29, 2015 10:56 pm
by g8dhe
The motors need about 20Amps and the full 14 volts helps due to the voltage drop on the length length of cable run from batteries to rear controller then up to the motors. Most chargers aren't going to be able to source both the voltage and current needed. The alternator is designed for 90 Amps at around 14 volts hence it can handle the load quite happily!