Auto starting for low batteries, is there such a thing?

pugslyyy

Expedition Vehicle Engineer Guy
I should have mentioned I knew about the car alarms with the autostart built into it but I'm not looking for a car alarm, I'm looking for a unit that I can wire and or plug in to start my vehicle when my batteries get too low.
If there's someone out there who has a unit like this I'd be willing to be a test case... (willing to pay )

A remote start system is pretty much just a 'hotwire' (that you control) - so it would be pretty easy to trigger a start based on any sort of a sensor condition.

My current remote starter can be set to start every X hours and run for Y minutes. I've never used it that way, but I have made use of the timed run feature - crank it with the auto start knowing it will shut off after Y minutes unless I turn the key in the ignition.

The off-the-shelf autostart units have a lot of the safeties and interlocks built in (won't start in gear, won't start if clutch is pressed or brake is pressed, etc) and sense when the motor is running so that the starter doesn't crank longer than it has to. If I were going to do what you suggest I would start with an off-the-shelf remote starter and then build in the additional functionality with an arduino.

Another alternative - my xantrex charger/inverter can also autostart and that's all programmable - though mine is directed at the genset not the truck motor, but it could reconfigured to start the truck motor if the battery voltage fell below a certain level instead.
 

Bbasso

Expedition goofball
I hate to admit this but it's over my head... Would anyone want to build / make one and we'll discuss money privately?
 

rayra

Expedition Leader
superficially this seems like a good idea, but 'failure mode' (low power) usually means switching stuff OFF. Not starting something. Doesn't seem like a smart thing to do.

eta yikes, hadn't even got to the part about having your hands on the motor pulling maintenance and having it suddenly kick on. Hell with that.
 

wirenut

Adventurer
Ram offers something like this on a cab and chassis truck. It's intended for the ambulance upfit package I think. It says that it monitors battery voltage and will start or idle up the engine or something to keep the batteries charged up.
As for aftermarket, there are many devices like this used in off grid electrical systems. They monitor a battery bank and start a gen set as necessary. The Conext XW AGS and the Magnum AGS will both monitor voltage and give a start signal. The Conext has, I think, 14 different wiring combinations that can be used with different gen sets. I think there is one that is a run signal closure and a timed start signal which is what a vehicle would need.
 

pugslyyy

Expedition Vehicle Engineer Guy
superficially this seems like a good idea, but 'failure mode' (low power) usually means switching stuff OFF. Not starting something. Doesn't seem like a smart thing to do.

eta yikes, hadn't even got to the part about having your hands on the motor pulling maintenance and having it suddenly kick on. Hell with that.

auto-start systems are pretty common in the backup-power world. Most commonly you have an interlock on the enclosure (i.e. bonnet/hood) The remote start systems that I have used all included interlocks and warning stickers.

For industrial systems it is pretty commonplace to have lockout devices that prevent system activation when a technician is working on it. Something as simple as a home furnace will have it, so it really is no big deal.
 

rayra

Expedition Leader
yes, I'm aware of that and generators and the like. I'm just questioning what labor it's saving if I have to take active actions to DISable it for safety, how is that better than taking active actions to start my vehicle when my batteries are low.
I'm not trying to quibble or pick nits, I'm trying to talk about the logic of the thing, more than the feasibility. Sure it can be done, but to what gain?
And I'll point out that current generation of better inverter-controllers, the 'failure mode' for a low battery is shut off the draw. I can see having an auto-start on low battery in a fixed installation or some key medical system. But I'm seeing more negatives than positives in a mobile vehicle system.

I can't recall the key word-concept my brain is itching about but there's a thing in mitigation analysis and risk reduction that talks about taking human actions OUT of a process to make it safer. Less human interaction, less human error. But that also requires intelligent design in the logic of a thing. I think it was in an FAA or aviation industry analysis about the big crash during Airbus automation development, where the test plane was loaded with pilots and engineers and was making touch and go runs and after some multiple the pilot tried taking off again, but the plane software was determined to interpret everything as a landing and thus the plan flew off the end of the runway at a low and slow attitude and plowed into the forest, killing everybody. IIRC the summary of the analysis talked about some design decisions made in the software development process that required a human action at a certain critical point, and absent that action the plane's program did what it thought best and other routines countermanded the command pilot's inputs, resulting in the crash. The whole thrust of the thing was 'try not to make critical safety reliant on human action' or somesuch.
I'm not saying there's a direct corollary here or trying to inflate the dangers. I'm just trying to point out that when you are making more design decisions and requiring more actions to safeguard something in a device, than the thing is supposed to be saving you in the first place, maybe the whole thing needs to be re-thought. But again I'm not trying to be naysayer about it. Just trying to make a point about logical design and not getting into a loop of making more changes because of changes.

What do you say to your camping neighbors when your diesel kicks on at 3am?
 

Bbasso

Expedition goofball
Geeze, I'm not going to let anyone work on my rig without disabling the auto-start thingy...
Please don't think I'm that reckless, i would be in control of my van at all times. Unless it was stolen, then the crooks would get what's coming to them ;)
But I'd love to have and know that it will start when it sees a predetermined battery point to start and charge itself.
As I mentioned earlier, if there is someone who has the knowledge and skills to make this setup, please contact me asap so we can discuss this business opportunity.
Bbasso@yahoo.com
 

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