Steve Fractals
New Member
- Joined
- Sep 6, 2022
- Messages
- 172
Hi guys,
Recently installed 4x12v 130ah flooded acid in series to get 48v. They are Snappy Leisure (generic) and I've tried emailing asking them for charge parameters but getting no relpy.
Now from full down to 50% (65ah), I calculate I should be getting around 6hrs at 500w load but only getting less than 3 hours.
I have the following settings.
55.6v bulk
54v float
49v back to utility
54v back to battery
48v battery cut off.
I mostly use less than the 500w and mostly sit just under 400w.
My MMP AIO inverter shows that I'm at 50% charge remaining at somewhere between 49&50v but can't set in between. Tried it at 50v back to grid but get a lot less time. Trying at 49v and still get way less than the expected 6+ hours.
Should I trust my inverter remaining charge scale?
Should I be using different settings?
I know calculating SOC is educated guesswork esp on lead acid but is there a general rule of battery bank voltage to state of charge e.g. 49v=50% or some way for me to work it out approximately?
I did fully charge individually and tested that the batteries all hold a steady charge almost equal to each other. Also full charge and monitored bank holding charge etc.
If these were LifePo then I'd probs do a full to empty test and then calculate from that but reading that I shouldn't do full to empty even for testing in Lead, I know that going down to 0 regularly will knacker them bit is that true even for testing?
Recently installed 4x12v 130ah flooded acid in series to get 48v. They are Snappy Leisure (generic) and I've tried emailing asking them for charge parameters but getting no relpy.
Now from full down to 50% (65ah), I calculate I should be getting around 6hrs at 500w load but only getting less than 3 hours.
I have the following settings.
55.6v bulk
54v float
49v back to utility
54v back to battery
48v battery cut off.
I mostly use less than the 500w and mostly sit just under 400w.
My MMP AIO inverter shows that I'm at 50% charge remaining at somewhere between 49&50v but can't set in between. Tried it at 50v back to grid but get a lot less time. Trying at 49v and still get way less than the expected 6+ hours.
Should I trust my inverter remaining charge scale?
Should I be using different settings?
I know calculating SOC is educated guesswork esp on lead acid but is there a general rule of battery bank voltage to state of charge e.g. 49v=50% or some way for me to work it out approximately?
I did fully charge individually and tested that the batteries all hold a steady charge almost equal to each other. Also full charge and monitored bank holding charge etc.
If these were LifePo then I'd probs do a full to empty test and then calculate from that but reading that I shouldn't do full to empty even for testing in Lead, I know that going down to 0 regularly will knacker them bit is that true even for testing?