question

sek avatar image
sek asked

Can I use MPPT output to charge/float battery?

Hi there,

I have a MPPT 75/15 in a boat charging a dedicated house battery and I would like to know if I can connect the output to keep the other 2 cranking batteries charged while boat is stored.

Thanks

MPPT SmartSolar
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

1 Answer
kevgermany avatar image
kevgermany answered ·

If the batteries are all the same chemistry/voltage and your wiring is OK, yes. You might find the boat is already wired for this with a switch that connects start and house for boost when starter batteries are low.

5 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

sek avatar image sek commented ·
Hi Kev,

Thanks for replying.

All batteries are light-deep cycles lead acid.

I have done the wiring for the solar and house batteries, I've got a two-way switch which is there only to isolate as I've added a combiner to allow charging of both batteries once the load is available.

there's an Anderson on the end of the load cable that I can connect to the batteries but I'm not sure what voltage to go for as usually they will be nearly full battery just needing topping up and floating....

0 Likes 0 ·
Show more comments