Dual-battery, onboard smart charger

[Fastrat]

By “the wire” do you mean the the red small red wire on the back side of the DVSR module?

If the above is true, and this red DVSR wire is landed on a bus from the switched side of the start battery switch the DVSR will be active whenever the start switch is on, not just when the engine is running.

Can you provide a diagram illustrating what your wiring would look like?

Same diagram as above, simply cut the DVSR wire and splice it into the engine side of the start switch. As it is wired from the factory, it would be on without the start switch closed (ON)…this method would make it on without engine on and when off (in storage) then battery chargers could maintain each bank separately…if I’m understanding it all correctly. I'm prolly overthinking it though...I might just move the start battery sensing DVSR wire from the battery side to the engine side and call it a day to separate them when switch is in off position. I may send BEP an email to ask, just in case though.

Edit: lol, thanks to FSH210, I see what you’re saying now and I’m obviously having a multi-day brain fart…that won’t work as it just completes the circuit.

 

[FSH 210 Sport]

Same diagram as above, simply cut the DVSR wire and splice it into the engine side of the start switch. As it is wired from the factory, it would be on without the start switch closed (ON)…this method would make it on without engine on and when off (in storage) then battery chargers could maintain each bank separately…if I’m understanding it all correctly. I'm prolly overthinking it though...I might just move the start battery sensing DVSR wire from the battery side to the engine side and call it a day to separate them when switch is in off position. I may send BEP an email to ask, just in case though.

Edit: lol, thanks to FSH210, I see what you’re saying now and I’m obviously having a multi-day brain fart…that won’t work as it just completes the circuit.

Just wire it to the switched / load side of the start battery switch and be done with it..that will make the dvsr active when the start battery switch is closed, and inactive when it is not and when you are charging batteries with the onboard charger.

No worries, that is the main reason we post and ask questions..

Get that done and go out and burn a lot of fuel!

 

[Shookie]

Following up with a question just to make 100% sure I've got this right.... I just got a boat lift and my 242 will sit there. So, I'm going to add a Noco 10X2 and I plan to just connect it to each battery directly. Doing this, I don't need to make any other wiring changes discussed here and elsewhere, correct?

Is there a reason why I shouldn't do it this way? I've read this thread and others, and i don't get making the DVSR mode if you just direct connect them. I have a new AGM for the house battery and the original (7 year old) start battery. If the charger is directly connected to each battery, I'm not sure how the DVSR can impact things? But obviously I'm missing something...

 

[Shookie]

Went back and read a few threads again. Found this.... think that answers my question. Not cutting the wire means you lose the "smart" charging capabilities.... right?

Post in thread 'Making DVSR Active with Engines On Only'

Jul 22, 2016

yes, they will charge... sort of .

The issue is that the DVSR will confuse the charger, and stop the banks from being read independently. Your "smart" charger will be more like an old "dumb" charger, taking away the advantages of these new chargers.

• Derek Fosbury

 

[FSH 210 Sport]

Went back and read a few threads again. Found this.... think that answers my question. Not cutting the wire means you lose the "smart" charging capabilities.... right?

Post in thread 'Making DVSR Active with Engines On Only'

Jul 22, 2016

yes, they will charge... sort of .

The issue is that the DVSR will confuse the charger, and stop the banks from being read independently. Your "smart" charger will be more like an old "dumb" charger, taking away the advantages of these new chargers.

• Derek Fosbury

Essentially yes…. It will still work, but as soon as the voltage reaches 13.4 the dvsr will activate and tie the batteries together. Just hooking up the DVSR wire to the switched side of either the start or house battery switch will keep the DVSR off when the battery switches are off. This allows the NOCO to perform its regular charging of the deep cycle battery independently, as well as the start battery. If the start battery is flooded lead acid, the NOCO will run a monthly soft equalizing charge to keep the cells balanced. AND more importantly the charge profiles for a flooded lead acid battery and an AGM are different, the fla battery profile has higher voltage, probably as high as 15.5 Volts, whereas the AGM is limited to 14.4.