REO
Senior Member
Here is a drawing of how I am planning to re-wire for LFP batteries. Some of the cables already exist. To keep things simple for discussion, no emergency cutoff switch, fuses, inverter/charger or second battery charger wiring are included. Comments and suggestions are welcome.
![battery diagram 2 .jpg battery diagram 2 .jpg](https://www.trawlerforum.com/data/attachments/120/120245-bae2877794ba7cb542273bc5be2eb585.jpg)
The boat is an Albin 27 trawler with a Beta Marine 50 hp diesel. It has a 120 amp alternator and will have an external regulator. I am planning to use two 60 amp DC to DC chargers wired in parallel to maximize charge from the alternator. The boat also has a 6.5 kw generator and will have a 2000 watt inverter/charger with 80 amp charger wired to the house bank. It currently has a 20 amp 3 way charger that charges the current house, starter and generator batteries.
I have gathered as much information as I could find, and think that this is a workable plan, but sure would appreciate some expert input. I have a few questions:
If I parallel two 60 amp DC to DC chargers will this significantly decrease the time to fully charge the LFP bank?
How many amps (max) will the LFP batteries actually get from the DC to DC chargers?
Will the ACR connected between the generator battery and engine start battery cause a problem?
Does the capacity of the generator battery matter for Dc-DC charging through it?
The proposed parallel wiring for the house batteries is supposed to be good for balancing the load between batteries on discharge, but it uses different lengths of jumper cables between batteries. Doesn't this cause a problem with different resistances when charging?
![battery diagram 2 .jpg battery diagram 2 .jpg](https://www.trawlerforum.com/data/attachments/120/120245-bae2877794ba7cb542273bc5be2eb585.jpg)
The boat is an Albin 27 trawler with a Beta Marine 50 hp diesel. It has a 120 amp alternator and will have an external regulator. I am planning to use two 60 amp DC to DC chargers wired in parallel to maximize charge from the alternator. The boat also has a 6.5 kw generator and will have a 2000 watt inverter/charger with 80 amp charger wired to the house bank. It currently has a 20 amp 3 way charger that charges the current house, starter and generator batteries.
I have gathered as much information as I could find, and think that this is a workable plan, but sure would appreciate some expert input. I have a few questions:
If I parallel two 60 amp DC to DC chargers will this significantly decrease the time to fully charge the LFP bank?
How many amps (max) will the LFP batteries actually get from the DC to DC chargers?
Will the ACR connected between the generator battery and engine start battery cause a problem?
Does the capacity of the generator battery matter for Dc-DC charging through it?
The proposed parallel wiring for the house batteries is supposed to be good for balancing the load between batteries on discharge, but it uses different lengths of jumper cables between batteries. Doesn't this cause a problem with different resistances when charging?