I am a volunteer for the water scouting, we have a boat that that has a generator, batteries and a inverter on there. We would like to extend to solar power. Currently we have a battery set for 24v load and the 24v 220v inverter. We would like to be able to charge both with the same solar panels and mppt solar charger. We were thinking about putting a dc/dc charger in between the banks. The 1400 seems most suitable, since it can adjust its power. We hope we can also adjust the power via the cerbro. That way we imagine loading more in the 24v battery bank when there is more solar available and less when there is not.
This is the schematic we were thinking about. Could somebody check for us if this should work? The thing we are a bit concerned about is the shared negative for the 1400 dc/dc converter.
Since most of the components will be arranged via donations, it would be sad if we get the wrong stuff:D So your help is very apricated!
@HenriB sounds like a good project. We may need some more information to provide the right answers.
Are the batteries to be replaced as a part of this project? If so, just buy 24 volt batteries and eliminate the battery balancers.
Are the batteries or will they be Lithium or AGM or
some other chemistry?
How big is the boat? How big are the battery banks?Why are two battery banks shown? Maybe one is the start battery bank?
How much solar power will you be able to put on the boat?
Does the boat have an alternator on the engine? How big and what sort?
The design can be refined when the details are known so the donated assets can be put to good use.
Thanks for the questions:
Batteries are 12v lead semi-traction 240ah batteries. They are second hand donated. We already have them.
shunts, balancers, chargers and 24-240 inverter are also already present.
boat is 32m
battery banks are 6x240ah and 2x240ah
We have a 24v system that is used for ais, navigation lights, vhf etc. Since the boat does not have an alternator (engine from the 1930’s). We have made sure the 24v is a separate battery system. That way if some of the scouts use a lot of 220v(toilet pumps or charging phones for example) and empty the battery 220v battery bank, we still have 24v left for navigation lights (for example the anchor light) and VHF.
We will be putting 5 440wp solar panels on the boat.
