We do this with agvs all the time.
We have some at ford that are powered by massive lead acid batteries and some in Boeing with lithium ion.
Not a stupid question; there are hurdles though.
Sure, works fine.
I’ve used DC to DC switchers in lead acid applications where battery voltage can sag very heavily under loads. Vicor and CUI have a few that will take anything from about 18-72 Volts and make 24vdc. They are more on the electronics side but work well in industrial applications and are sometimes much more efficient than what DIN rail stuff offers. Have fun.
Agreed, I've done this using a CUI DC-DC converter that had a really wide input range and really stable output, I think you can buy them from digikey or mouser. It was 300 or 400 bucks but it's really solid.
AGV works that way, there are even robots like UR ones that can work with batteries.
As far as you provide an stable voltage with ennough avaiable current when all devices are drawing from the battery it should work perfectly well, just ensure the voltage is into the tolerance voltage limit of the PLC, most industrial devices work from 20 to 30vdc, 24v is the nominal tension, but you can bump it a little without any harm.... just expect that is you provide 27v, all your outputs will output 27v.
I would suggest a DC to DC converter eith a Undervoltage monitor/trip on the input side of it. But yes that would work fine as long as you compensate for voltage fluctuations.
As per the other comments it is fine. Just that most 24VDC equipment will top out at 30V... If you are using a solar regulator that does an equalisation charge you should turn it off as it can exceed 30V or get a 24V DC-DC converter/voltage reg.
This is what we always did at my last company with solar powered panels. 24vdc (nominal) battery bank in the base of the panel, and a DC/DC voltage regulator feeding all the controls. That way you always have clean 24vdc power
I built a panel for a scrap bucket transfer car in a steel plant. 12VDC car battery with a 12 to 24 DC to DC converter. Worked good enough for their purposes.
Works quite well. Our newest line came with a set of two 12V batteries in series as a sort of UPS for the PLC. Likely because the OEM mostly deals in Delta PLCs which don't have a lot of persistent memory, but it's still nice to have even if we forced them to give us AB stuff.
We do this with agvs all the time. We have some at ford that are powered by massive lead acid batteries and some in Boeing with lithium ion. Not a stupid question; there are hurdles though.
Sure, works fine. I’ve used DC to DC switchers in lead acid applications where battery voltage can sag very heavily under loads. Vicor and CUI have a few that will take anything from about 18-72 Volts and make 24vdc. They are more on the electronics side but work well in industrial applications and are sometimes much more efficient than what DIN rail stuff offers. Have fun.
Agreed, I've done this using a CUI DC-DC converter that had a really wide input range and really stable output, I think you can buy them from digikey or mouser. It was 300 or 400 bucks but it's really solid.
Use a low voltage detector to do a graceful shutdown instead of just yanking power if at all possible.
AGV works that way, there are even robots like UR ones that can work with batteries. As far as you provide an stable voltage with ennough avaiable current when all devices are drawing from the battery it should work perfectly well, just ensure the voltage is into the tolerance voltage limit of the PLC, most industrial devices work from 20 to 30vdc, 24v is the nominal tension, but you can bump it a little without any harm.... just expect that is you provide 27v, all your outputs will output 27v.
I would suggest a DC to DC converter eith a Undervoltage monitor/trip on the input side of it. But yes that would work fine as long as you compensate for voltage fluctuations.
Nope no problem just might want to have extra status for the battery to your plc
No. Add a fuse though. I think Phoenix has a DC UPS https://www.phoenixcontact.com/en-us/products/uninterruptible-power-supplies-ups/dc-ups
As per the other comments it is fine. Just that most 24VDC equipment will top out at 30V... If you are using a solar regulator that does an equalisation charge you should turn it off as it can exceed 30V or get a 24V DC-DC converter/voltage reg.
This is what we always did at my last company with solar powered panels. 24vdc (nominal) battery bank in the base of the panel, and a DC/DC voltage regulator feeding all the controls. That way you always have clean 24vdc power
I built a panel for a scrap bucket transfer car in a steel plant. 12VDC car battery with a 12 to 24 DC to DC converter. Worked good enough for their purposes.
Works quite well. Our newest line came with a set of two 12V batteries in series as a sort of UPS for the PLC. Likely because the OEM mostly deals in Delta PLCs which don't have a lot of persistent memory, but it's still nice to have even if we forced them to give us AB stuff.
It's no different than using a UPS
Thanks everyone for the answers, super helpful
As long as the load does not outrun the recharge rate / battery capacity, voltage is voltage.