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robl
@robl
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Joined: Mar 23, 2022
Last seen: May 8, 2026
Profile Activity
Topics: 1 / Replies: 214
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RE: New Fogstar 15.5kWh upright solution

@ggw When the sunsynk is used in lithium % mode, it also still makes use of the basic voltage figures from the lead acid mode - these must be set corr...

2 years ago
Forum
Energy Storage
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RE: New Fogstar 15.5kWh upright solution

@ggw I left ours in AGM volts mode for maybe 2 months, the adaption was automatic but slow. I did try and hurry it along by manually tweaking the A...

2 years ago
Forum
Energy Storage
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RE: New Fogstar 15.5kWh upright solution

We have 304Ah batts too, but after letting the sunsynk auto detect to the size, it thinks they are vastly different to this. Our system now works ver...

2 years ago
Forum
Energy Storage
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RE: New Fogstar 15.5kWh upright solution

When we first installed our Sunsynk I initially tried to use Li-bms as the battery state - this was dreadful, resulting in all sorts of weird behaviou...

2 years ago
Forum
Energy Storage
Reply
RE: New Fogstar 15.5kWh upright solution

@ggw I had a lot of trouble with the sunsynk originally(ok, I still do…). New LiFePo4 battery, with the Seplos bms that talked with it, and yet I fou...

2 years ago
Forum
Energy Storage
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RE: New Fogstar 15.5kWh upright solution

@ggw While I’ve set it to work down to 1%, it’s an extremely rare occurance. Most of the time it cycles 90% to 50%. While I appreciate the degradati...

2 years ago
Forum
Energy Storage
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RE: New Fogstar 15.5kWh upright solution

Screenshots from our Sunsynk. We have an old independent 4kWp FIT install, and our elec is Octopus Go. The sunsynk charges from night elec and PV, r...

2 years ago
Forum
Energy Storage
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RE: New Fogstar 15.5kWh upright solution

@misterb I'd originally intended to top balance in parallel. When I thought it through, it just seemed a lot of faff - how to compress the cells? ...

2 years ago
Forum
Energy Storage
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RE: New Fogstar 15.5kWh upright solution

@misterb Yes. In the case, compressed, with a capacitive active balancer. I think balancing should not be done uncompressed.

2 years ago
Forum
Energy Storage
Reply
RE: New Fogstar 15.5kWh upright solution

We charged our 15.5kWh 280L system to 56V in AGM V mode (3.5V per cell) over the coldest months with Octopus Go, which is 100% or near enough. That w...

2 years ago
Forum
Energy Storage
Reply
RE: New Fogstar 15.5kWh upright solution

@ggw I think the cable to the unit needs to be double insulated if you can touch it. Ideally the twisted pair from the CT should be away from any ma...

2 years ago
Forum
Energy Storage
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RE: Is your heat pump insured?

Personally I think it's only worth insuring stuff when your life would be really difficult without it. Home against fire, car, medical if you're on h...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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