Blue Opal/Electrics: Difference between revisions
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Solar charger fuse is inline automotive. | Solar charger fuse is inline automotive. | ||
2026-08: Update needed - Solar is MPPT 75/15, connected to bus bars that connect to the lithium house. Bus bar connects to battery +ve, to charge line from DC-DC, and feeds MPPT and Cerbo GX. Negative bus connects to starter negative, house negative, MPPT and Cerbo negative. | 2026-08: Update needed - Solar is MPPT 75/15, connected to bus bars that connect to the lithium house. Bus bar connects to battery +ve, to charge line from DC-DC, and feeds MPPT and Cerbo GX. Negative bus connects to starter negative, house negative, MPPT and Cerbo negative. Renogy replaced with 100W folding panel from Amazon. Feed line for solar in cockpit using Bulgin Buccaneer 10-250V, fed via ferruled wires to MPPT. | ||
{{#mermaid:config.theme = neutral | graph TD; | {{#mermaid:config.theme = neutral | graph TD; | ||
Revision as of 10:40, 23 August 2026
Battery banks
House bank - 2x 105 Ah SLA. Effective 100 Ah. Starter - 1x 80 Ah SLA. Effective 40 Ah.
Alternator
BV PSH 80A, Hitachi saddle mount. Sourced from Myles Balfe. V-belt sheave.
Terminal and driver sizes
| Area | Item | Fixing | Driver | Stud |
|---|---|---|---|---|
| Battery | Shunt | Terminal | 10mm | 8mm |
| House | Terminal | 14mm | 10mm | |
| Starter | Terminal | 13/14mm | 10mm | |
| Blue Sea Fused Bus | Terminal | 10mm | 5mm | |
| MIDI fuses | Terminal | 10mm | 8mm | |
| Negative bus | Terminal | 14mm | 8mm |
Core power distribution and charging
This diagram is for the wiring in the starter and house battery bank compartments.
Charge and Distribution fuses are MIDI style with spare, Blue Sea 7720.
Solar charger fuse is inline automotive.
2026-08: Update needed - Solar is MPPT 75/15, connected to bus bars that connect to the lithium house. Bus bar connects to battery +ve, to charge line from DC-DC, and feeds MPPT and Cerbo GX. Negative bus connects to starter negative, house negative, MPPT and Cerbo negative. Renogy replaced with 100W folding panel from Amazon. Feed line for solar in cockpit using Bulgin Buccaneer 10-250V, fed via ferruled wires to MPPT.
To-do: Replace direct-to-terminal with distribution bus bars. Starter negative terminal has more than 4 cables attached.
Blue Sea Ancillary
This distribution setup is used for power distribution in the saloon; it's in the same physical area as the batteries. Distributor is a Blue Sea Systems ST compact 8-circuit (5046) with 10-32 stud, and 8-32 screw terminals.
Always on distribution
This powers low draw devices that should be powered without the house switch being engaged. Basically, lights. Located in the wiring cabinet above and behind the chart table. Wired to supply side so it's always got power, bar the local fuse blowing.
Water pump
Wired via a relay so that the switch by the chart table just activates the relay, and the pump gets power from 6mm2 direct from the battery compartment.
The relay is the same as the one for the engine starter, 12V 40A SPST with 30/85/86/87 terminals, normally open.
