Fix crash in find_battery_size when SOC history contains 'unavailable' states

[Copilot]

GivEnergy dual AIO setups expose a Gateway entity whose soc_kw history contains 'unavailable' state entries (the Gateway has no batteries directly attached). The auto battery-degradation logic introduced in recent releases called float(state["state"]) in a bare generator expression with no error handling, crashing Inverter.__init__ on every cycle and leaving Predbat permanently stuck in "re-evaluating".

Changes

• apps/predbat/inverter.py — find_battery_size: Replace the one-liner max(float(...) for state in ...) generator with an explicit loop that skips non-numeric entries via try/except (ValueError, TypeError). Consistent with the identical pattern used a few lines below for built_list construction.

# Before — crashes on 'unavailable'
soc_max = max(float(dp0(float(state["state"]))) for state in soc_kw_data[0]) if ...

# After — skips non-numeric states
soc_values = []
if soc_kw_data and len(soc_kw_data) > 0:
    for state in soc_kw_data[0]:
        try:
            soc_values.append(float(dp0(float(state["state"]))))
        except (ValueError, TypeError):
            pass
soc_max = max(soc_values) if soc_values else None

• apps/predbat/tests/test_find_battery_size.py: Add test_find_battery_size_soc_kw_unavailable — injects 'unavailable' and 'unknown' entries (~20% of history) into the soc_kw history and asserts no exception is raised and the size estimate remains within 30% tolerance.

[Copilot]

Pull request overview

Fixes a crash in Inverter.find_battery_size() when soc_kw history includes non-numeric Home Assistant states (e.g., "unavailable"/"unknown"), which can occur in GivEnergy dual AIO Gateway setups and previously caused Predbat to get stuck re-evaluating.

Changes:

• Make find_battery_size() robust to non-numeric soc_kw history entries by skipping values that can’t be parsed as floats.
• Add a regression test covering soc_kw history containing "unavailable"/"unknown" entries and asserting estimation still succeeds within tolerance.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
apps/predbat/inverter.py	Avoids crashing battery-size estimation when soc_kw history contains non-numeric states by filtering invalid entries before computing soc_max.
apps/predbat/tests/test_find_battery_size.py	Adds a regression test that injects "unavailable"/"unknown" states into soc_kw history and validates estimation remains stable.