Ohms_Cousin
New Member
- Joined
- Nov 6, 2020
- Messages
- 62
I am trying to figure out how to charge a battery bank in the bow of a sail boat. The charge sources are at the stern of the boat (as I guess most charging sources would be in a sail boat).
The battery bank up front would be around 30-40kWh at 48vnom. The DC cabling should support up to 200 amps of current. To run a DC cable from the stern charge sources to the bow battery bank would be about 15mtrs of cable each way, so a 30 mtr run of DC cabling. Not really very practical.
It seems that an AC source to charge the bow battery bank would be best. I am thinking that perhaps a Victron AC charger up front close to the battery bank would work. So that means I would need to run an AC cable set from the stern to the bow. Is there any reason I couldn't power the AC charger up front from a Victron inverters output in the stern?
I plan on putting an Inverter up front fed from the batteries up front as I want to have 2 inverters onboard for redundancy.
Early days on this thought, so before I go to far wondering if powering an AC charger up front from the output of an inverter in the stern makes sense I would like to hear your thoughts on the pitfalls of this type of setup. I am sure there are issues here I am not thinking about.
I would think its very inefficient for one, what with the losses involved in inverting from battery in the stern to send AC to a charger up front to turn the AC back to DC to charge the front battery bank. Then the battery bank up front powers the Inverter to turn it back to AC. Got to be horrible losses involved in all that.
But how else can one charge a large battery bank with DC charge sources when the battery is a 30 mtr total cable run from the charge source? Sure massively thick cables are one way, but it is that practical ?
The battery bank up front would be around 30-40kWh at 48vnom. The DC cabling should support up to 200 amps of current. To run a DC cable from the stern charge sources to the bow battery bank would be about 15mtrs of cable each way, so a 30 mtr run of DC cabling. Not really very practical.
It seems that an AC source to charge the bow battery bank would be best. I am thinking that perhaps a Victron AC charger up front close to the battery bank would work. So that means I would need to run an AC cable set from the stern to the bow. Is there any reason I couldn't power the AC charger up front from a Victron inverters output in the stern?
I plan on putting an Inverter up front fed from the batteries up front as I want to have 2 inverters onboard for redundancy.
Early days on this thought, so before I go to far wondering if powering an AC charger up front from the output of an inverter in the stern makes sense I would like to hear your thoughts on the pitfalls of this type of setup. I am sure there are issues here I am not thinking about.
I would think its very inefficient for one, what with the losses involved in inverting from battery in the stern to send AC to a charger up front to turn the AC back to DC to charge the front battery bank. Then the battery bank up front powers the Inverter to turn it back to AC. Got to be horrible losses involved in all that.
But how else can one charge a large battery bank with DC charge sources when the battery is a 30 mtr total cable run from the charge source? Sure massively thick cables are one way, but it is that practical ?