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I thought that was for scurvy?

I am only charging 2 endurant 6 volt house, I think 200 amp hrs and 1 start, with 150 watt solar aswell, so the Bosch 120 amp alt (from Graeme) shouldn’t be to stressed

Definitely a hijack. Current sense termination is really the only sensible way to charge LFP. This ZM5 unit does not monitor current and it has no alternator temp sensing. If it does not measure the temperature then it can not back off the output current and the alternator will cook itself if it gets to hot. It's the same as running an engine without a temperature sensor/warning - it will be absolutely fine, until the day it isn't... It sets the output voltage, holds it there for a set period of time once it is reached and then backs off to a float voltage after that t

Another option: Bareboat Necessities OS - Raspberry Pi OS-based Marine Linux built for boats. BBN OS is completely free and opensource. Free downloadable SD card image. Main features: GPS, compass (via IMU), AIS support NMEA networks integration, multiplexing, SignalK and plugins, dashboards Chartplotting (OpenCPN and plugins, AvNav), Navigation, Waypoints Touchscreen support (zoom gestures, right-click emulation), on-screen touch keyboard Weather forecasts (GRIBs, etc), weather routing, climatology packages, planning Autopilot (PyPilot need

Child car seats. Liferafts. Safety harnesses and tethers. The WOF on my car. Structural Engineer's Practising Licences. (actually, on second thoughts, perhaps they are too lax...) Medications. Food sold to consumers ready-to-eat. Driver licences. Credit Cards. Software licences. Aircraft components. Just a quick list of things that meet a broad definition of "stuff that seems to be too conservatively lifespan rated because I (me, maybe not you) don't understand it, but perhaps someone knows more than me".

You can also tap in at the alternator if that’s handier There will be a feed from the ignition to the alt, just turn on the ignition but don’t start the engine, use a multi meter to find the terminal with power and use a double spade terminal from there.

A GME 403 the orange one, is essentially obsolete- bravo on finding some cheap replacement batteries but one has to wonder how do you value life especially at sea? Why would you not invest in a GPS capable EPIRB, Accuracy improves from 4 sq miles to often less than 100 metres which is comforting to know when you have hit the big red button WHILE stepping up into a life raft more especially so if you are treading water. Plenty of time to ponder how much you saved on batteries for an obsolete EPIRB. THERE SHOULD BE NO SHORT CUTS ON SAFETY. Someone on site found a brand new G

I am not sure you have understood my post. I cannot get the unit serviced or battery replaced by the vendor because I dd not have the battery changed within a proscribed period. The option of the vendor doing the extensive testing is not available to me. I perhaps don't have as deep pockets as some so will try and make do. I do have quite a bit of experience in reliability engineering in the oil and gas area. The components within my EPIRB should result in the device having a SIL (safety integrity level) rating suitable for a very low probability of failure on demand. A presumably high spec p