Marine House Bank SoH Calculator
Estimate state of health for a marine house bank from age, cycling pattern and depth of discharge.
How healthy is your marine house bank? Marine house banks combine deep cycling at anchor with months of float in the marina — AGM tolerates the vibration but sulfates if left partially charged, the classic boatyard failure mode. This estimator combines cycle wear (equivalent full cycles vs the chemistry's rated life at your depth of discharge) with calendar aging to give boat owners a screening SoH figure — confirm with a measured capacity test.
SoH = 100% − cycle fade (20% × EFC ÷ rated cycles) − calendar fade (4.0%/yr for Lead-acid (VRLA/AGM)). Screening model — a measured capacity test (see the capacity-test tool) always beats an estimate.
Engineering estimate from published standards and typical equipment data. Site conditions, equipment datasheets and measured data govern the real result — confirm with a qualified engineer.
Use the free Marine House Bank SoH Calculator online — Estimate state of health for a marine house bank from age, cycling pattern and depth of discharge. Runs instantly in your browser: no signup, no upload, mobile-friendly.
About Marine House Bank SoH Calculator
How healthy is your marine house bank? Marine house banks combine deep cycling at anchor with months of float in the marina — AGM tolerates the vibration but sulfates if left partially charged, the classic boatyard failure mode. This estimator combines cycle wear (equivalent full cycles vs the chemistry's rated life at your depth of discharge) with calendar aging to give boat owners a screening SoH figure — confirm with a measured capacity test.
How to use Marine House Bank SoH Calculator
- 1Confirm the chemistry (the application default is pre-selected).
- 2Enter the battery's age, cycling rate and typical depth of discharge.
- 3Read estimated SoH, remaining cycles, and years until the 80% threshold.
Why use Marine House Bank SoH Calculator?
- ✓Combines cycle wear and calendar aging — the two clocks every battery runs on
- ✓Chemistry-specific rates: LFP, NMC, lead-acid and more, not a generic curve
- ✓Depth-of-discharge stress modeled with the inverse-power law real datasheets follow
- ✓Years-to-80% forecast for replacement planning
Frequently asked questions
What does state of health (SoH) actually mean?+
SoH is today's usable capacity as a percentage of nameplate: a 100 Ah battery measuring 85 Ah is at 85% SoH. It declines through cycle wear (energy throughput) and calendar aging (time and temperature). 80% is the conventional end-of-life for most applications — usable, but with shrinking margins.
How accurate is an estimated SoH versus a real test?+
Estimation from age and usage lands within ±5–10% for typical duty — good for planning, not for warranty claims. A measured capacity test (full discharge at rated current) is the ground truth; use the estimate to decide when testing is worth the effort.
What degrades batteries fastest?+
Heat above 35°C (roughly doubles aging per 10°C), deep discharges (100% DoD can cost 3–4× the cycle life of 50% DoD), sustained full charge (calendar aging accelerates at high voltage), and fast charging when hot. Address the top one in your duty and lifespan visibly improves.
Is the Marine House Bank SoH Calculator valid for my exact battery model?+
It uses chemistry-class parameters (cycle rating, calendar fade, DoD exponent) typical of quality cells. Premium cells beat the defaults somewhat; bargain cells underperform them. For fleet decisions, calibrate against one measured capacity test and the model tracks well after that.
Embed Marine House Bank SoH Calculator on your website
Want Marine House Bank SoH Calculatoron your own site? Paste this snippet into any HTML page — it's free, with no API key or sign-up. The tool loads in an iframe and keeps working exactly as it does here.
<iframe src="https://tooljolt.com/tools/marine-boat-battery-soh-calculator" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" title="Marine House Bank SoH Calculator — ToolJolt" loading="lazy"></iframe>Related tools
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