Hi all,
I’m upgrading my Hunter 340 sailboat from AGM to LiFePO4 and would greatly appreciate a review of my wiring diagram and build document by anyone with marine electrical experience. I’ve had a marine electrician (Colin Davis) consult on the plan and I want to make sure nothing has been missed before I begin installation.
System overview:
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Two LiFePO4 batteries (house bank) with integrated BMS
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Existing AGM starter battery (kept separate)
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Phoenix IP43 shore/generator charger — reconfigured to LiFePO4 profile, house bank only
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Blue Smart IP65 25A — dedicated AGM charger for starter battery (shore/Honda simultaneously with IP43)
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Orion XS 12|12–50A (non-isolated DC-DC) — alternator isolation, output set to 30–35A via VictronConnect
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Orion-Tr Smart 12|12–18A (isolated DC-DC) — starter battery keep-charge
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MPPT 100/50 + two MPPT 100/20 — three solar arrays
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BMV-712 (already installed) — shunt on house bank, Aux sense wire to starter battery positive
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BEP 770 battery disconnect
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Class T fuses within 7" of battery terminals (ABYC E-11)
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Galvanic isolator on shore power safety ground
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Honda EU2200 as shore power substitute (not simultaneous with shore)
What I’m asking you to look for:
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Any wiring errors, missing connections, or unsafe routing
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ABYC E-11 compliance issues (fusing, grounding, wire gauges)
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Any component interactions I may have overlooked (especially the dual-charger setup)
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Anything that looks wrong or that you’d do differently
Design Plan Simplified.docx (248.7 KB)
I’ve attached the wiring diagram (PNG) and the full build WORD document (i Have an HTML — happy to send it - can’t upload on this forum).
Thank you in advance — I’m a 72-year-old occasional sailor and I want to get this right before touching a wire