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upnorthandpersonal
@upnorthandpersonal
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Joined: Feb 11, 2026
Last seen: Oct 2, 2026
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Topics: 0 / Replies: 29
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Reply
RE: Safety update; RCBOs supplying inverters or storage batteries

  Germany, and other EU countries have historically had a single RCD for every circuit, not one per circuit. These are typically type A or F/B ...

8 months ago
Forum
Solar Photovoltaic (PV)
Reply
RE: What determines the SOC of a battery?

  Yes, but the issue is that 100% the inverter gets from the BMS is not really 100%, it's likely reaching 100% because one cell in the pack goe...

8 months ago
Forum
Energy Storage
Reply
RE: What determines the SOC of a battery?

@batpred   From your numbers (if I read them correctly, the graph is a bit small):   - You stop charging at 55V. If this is a 16s p...

8 months ago
Forum
Energy Storage
Reply
RE: What determines the SOC of a battery?

  Check the image below for a typical charge/discharge curve at different rates for LFP. The 'middle' part is, for all intents and purposes, fl...

8 months ago
Forum
Energy Storage
Reply
RE: What determines the SOC of a battery?

  LiFePO4 (LFP) does not mind going to 100% and 0% state of charge. In practice, stay below 3.55V per cell at the top, and say 3.0V at the bott...

8 months ago
Forum
Energy Storage
Reply
RE: What determines the SOC of a battery?

You can not accurately determine state-of-charge of a LiFePO4 battery by voltage, with the exception of the so-called 'knees', that is, where the batt...

8 months ago
Forum
Energy Storage
Reply
RE: Tell us about your Solar (PV) setup

  Actually not that far, however, the cost of my initial system (10kW solar and 28kWh battery, with inverters, charge controllers, etc.) was sl...

8 months ago
Forum
Solar Photovoltaic (PV)
Reply
RE: Home energy storage & battery register

I have 120kWh of LiFePO4 batteries (DIY), which I will likely expand this year to 200kWh. The original configuration 7 years ago was 28kWh with cells ...

8 months ago
Forum
Energy Storage
Reply
RE: Rate the quality of your heat pump design and installation

  In my opinion, it's useless then. If you are considered to have authority over who can do the work, and are intended to be a form of vetting ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat loss calculations and how they work in conjunction with heat pump sizing

  For reference, my house heat loss only gets to 8kW with an inside temperature of 22C when it's -40C outside...

8 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Heat loss calculations and how they work in conjunction with heat pump sizing

  Yes, you need something like this:     This kind of set-up is very common in places that use wood boilers here in Finland. ...

8 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Tell us about your Solar (PV) setup

  Or as we call it here, Tuesday 😉  

8 months ago
Forum
Solar Photovoltaic (PV)
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