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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

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.