Another lithium query

Report back. 105ah battery going well. Pleased I got Bluetooth - it does give confidence. Granton to Tobermory (solo to Inverness with autopilot) without mains charging but a goodly bit of motoring (canal and from Corpach the crew not so keen on gusty weather).

But if I hadn't motored might have had problems. Little sun for solar. Fridge on for a few weeks. Crew hairdryer.

What should I think about re charging? Or do I need a 2nd battery and mains charger?

I have a good lead acid charger but doesn't do lithium.
 
dgadee said:
Report back. 105ah battery going well. Pleased I got Bluetooth - it does give confidence. Granton to Tobermory (solo to Inverness with autopilot) without mains charging but a goodly bit of motoring (canal and from Corpach the crew not so keen on gusty weather).

But if I hadn't motored might have had problems. Little sun for solar. Fridge on for a few weeks. Crew hairdryer.

What should I think about re charging? Or do I need a 2nd battery and mains charger?

I have a good lead acid charger but doesn't do lithium.
Click to expand...
How is the alternator charging the LFP ? If it's via a DC-DC charger connect the mains charger to the starter battery.
 
The Victron DC DC charger is oscillating on and off - off and then on for a second or two. I think the smart lead acid battery charger (ctek 7000) is altering its output or the BMS doesn't like the input.

I tried supply and charge from ctek.

The Fogstar capacity is increasing slightly.
 
dgadee said:
The Victron DC DC charger is oscillating on and off - off and then on for a second or two. I think the smart lead acid battery charger (ctek 7000) is altering its output or the BMS doesn't like the input.

I tried supply and charge from ctek.

The Fogstar capacity is increasing slightly.
Click to expand...
What are the setting for the DC-DC charger ?
 
I have ordered a mains lithium charger. Will do next season. I think the smart lead acid charger is the problem.
 
PaulRainbow said:
All good, but you need to enable the engine shutdown detection or it's trying to charge all of the time.
Click to expand...
Yes, it was enabled but I reset it so that the charger would operate with engine off. All back to default now.

This has been an interesting test. On the project Fulmar I will use lithium, too, but put a 300ah battery in. Around the same power needs but the larger battery will give extra resilience for not too much more money.
 
PaulRainbow said:
How is the alternator charging the LFP ? If it's via a DC-DC charger connect the mains charger to the starter battery.
Click to expand...
Presumably this will only work satisfactorily if the mains charger is higher output than the DC-DC? Otherwise the DC-DC will cycle on and off and not really contribute very much.

(This is the problem I have with my wind gen- even in good conditions it's only putting out 100w or so, but the DC-DC is 220w)
 
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