2025 252SD Float Mode and Battery Question

[Signia]

New 2025 252SD, second time on the water today. First time I had it in float mode. Working fine and then I switched off the start battery and the connext screen lost power and then started to go into reboot loop until I turned the start battery back on. Do I need to have the start battery turned on for float mode?

 

[Neutron]

New 2025 252SD, second time on the water today. First time I had it in float mode. Working fine and then I switched off the start battery and the connext screen lost power and then started to go into reboot loop until I turned the start battery back on. Do I need to have the start battery turned on for float mode?

I never turn my batteries off while on the boat. There really is no reason to turn off the start battery. House systems are seperated and wont drain your starting battery unless the parallel switch is on. Plus not having your starting battery on could be a problem if for some reason an emergency comes up and you forget

 

[Signia]

Got it thank you!

 

[Neutron]

Got it thank you!

Your welcome

 

[FSH 210 Sport]

From page 39 in your owners manual

You boat is equipped with a DVSR or digital voltage sensing relay as part of the BEP marine battery switch. When the voltage on both the house and start batteries are at or below 12.7 volts the DVSR keeps the start and house batteries isolated from each other. When you start the engines all of their alternator output goes into the start battery, when the voltage reaches 13.2 volts the DVSR closes a switch that parallels the start and house batteries allowing the engines to start charging the house battery as well. After turning off the engines the DVSR will leave the batteries paralleled until the voltage drops to 12.7 then the DVSR will open the switch isolating the start and house batteries. This keeps the start battery fully charged and ready to start the engines while the house battery discharges . A beautiful set up.

If you do not yet have an onboard battery charger installed that should be at the top of your priority list, especially with your boat having the electric steering and DriveX . Most of the issues I’ve seen on here with boats that have the electric steering are from batteries that are not fully charged, this causes a fault code to get thrown. The alternators on our boats are not very powerful, approximately 14 amps per engine, and flooded lead acid and AGM batteries take a long time to charge due to the absorption cycle. Lead acid batteries whether flooded or AGM need to be re charged as soon as you get back to the dock or home as leaving them in a state of partial discharge damages them.

The NOCO charger is quite popular with folks on this site, be sure you get a 10A per battery charger.

NOCO - 2-Bank 20A On-Board Battery Charger - GENPRO10X2

The GENPRO10X2 is a 2-bank 20-amp waterproof on-board battery charger for lead-acid and lithium batteries and rated at IP68.

no.co

NOCO also makes a really cool AC port. NOCO - AC Port Plug - GCP1EX

A lot of people have also modified their DVSR so that it only becomes operational when the house or start battery switch is turned on, this allows the on board battery chargers to charge the start and house batteries independently so that these batteries get charged properly. Others have set up the DVSR so that it becomes operational only when the engines are on. These modifications are optional set ups with the BEP Marie battery switch and are quite easy to do…lots of help is available to you here on this site. Either way, get an onboard charger in your boat and leave it plugged in while the boat is not in use, your batteries will perform as best they can and will last longer.