Has anyone made a Battery Support Unit or has access to the schematics for one? The most useful one would be voltage regulated (~13.5 DC) and being able to handle up to 100A.

This is a typical explanation:

A powerful multipurpose professional battery charger & battery support unit or BSU. The battery charger features primary switched, computer controlled software technology that ensures the battery receives the maximum charge in the minimum time without damage. It is suitable for charging, AGM, Calcium/Calcium, Deep Cycle, Gel & Leisure battery types. The BSU function will provide a continuous 70 amp clean power supply for 12V systems and 60 amp for 24v systems. This unit is essential for maintaining the battery voltage during software downloads, programming, configuration & other 'key on engine off' workshop operations.
• 70 amp battery support function for ECU flashing / configuration
• Charging Current 12V - 70 amp
• Charging Current 24V - 60 amp
• Fully automated charging control
• Input voltage 190-255V AC 45-400Hz
• Built in voltage display
• Battery recovery mode
• Wall Mountable
• Internal Cooling Fan
• Standard, Gel & AGM batteries

 

Has anyone made a Battery Support Unit or has access to the schematics for one? The most useful one would be voltage regulated (~13.5 DC) and being able to handle up to 100A.

This is a typical explanation:

A powerful multipurpose professional battery charger & battery support unit or BSU. The battery charger features primary switched, computer controlled software technology that ensures the battery receives the maximum charge in the minimum time without damage. It is suitable for charging, AGM, Calcium/Calcium, Deep Cycle, Gel & Leisure battery types. The BSU function will provide a continuous 70 amp clean power supply for 12V systems and 60 amp for 24v systems. This unit is essential for maintaining the battery voltage during software downloads, programming, configuration & other 'key on engine off' workshop operations.
• 70 amp battery support function for ECU flashing / configuration
• Charging Current 12V - 70 amp
• Charging Current 24V - 60 amp
• Fully automated charging control
• Input voltage 190-255V AC 45-400Hz
• Built in voltage display
• Battery recovery mode
• Wall Mountable
• Internal Cooling Fan
• Standard, Gel & AGM batteries

Given the potential hazards in incorrectly charging batteries, I would be very reluctant to install a DIY solution for the project you have in mind.

The automotive industry produces an off the self solution to ensure that vehicle battery voltage fluctuations don’t occur during diagnostic work.

This link shows an example that would meet some of your design criteria – you might find one more suitable for your application.

https://www.ebay.co.uk/itm/GYS-FLAS...970270?hash=item43e5f6df1e:g:W9EAAOSw6dNWT1Ho

 

Given the potential hazards in incorrectly charging batteries, I would be very reluctant to install a DIY solution for the project you have in mind.

The automotive industry produces an off the self solution to ensure that vehicle battery voltage fluctuations don’t occur during diagnostic work.

This link shows an example that would meet some of your design criteria – you might find one more suitable for your application.

https://www.ebay.co.uk/itm/GYS-FLAS...970270?hash=item43e5f6df1e:g:W9EAAOSw6dNWT1Ho

I maybe should have been more concise in my direction. I was not looking for "charging capability" as much as a voltage controlled power supply. The intent was to just supplement what the battery would provide when the alternator is not charging the battery and supporting the vehicles modules. So the real question is a schematic of a voltage controlled power supply with capability of handling up to 100 amp draw.
This is for an Audi A8L to be able to adjust modules with VagCom program.

Any ideas?

 

I maybe should have been more concise in my direction. I was not looking for "charging capability" as much as a voltage controlled power supply. The intent was to just supplement what the battery would provide when the alternator is not charging the battery and supporting the vehicles modules. So the real question is a schematic of a voltage controlled power supply with capability of handling up to 100 amp draw.
This is for an Audi A8L to be able to adjust modules with VagCom program.

Any ideas?

I believe that the item I posted above is designed for the purpose you propose (provide the vehicle battery with circa 14V while someone is messing with the vehicle’s control module/diagnostics, with the engine off).

Here is something that might do what you want cheaper.

https://www.ebay.co.uk/itm/autobatt...m=183263578148&_trksid=p2060778.c100290.m3507

I doubt you could make one at that price.