@VanBarry what figures are you actually seeing? Worth clarifying whether you're measuring at the battery terminals or from the AC side, as that'll skew comparisons.
On my setup (garden office,...
Not a boat person myself — my lithium setup is for a garden office — but the principles carry over pretty well.
One thing worth flagging for narrowboat specifically: temperature management.
Had this exact issue with my 100/30 on the garden office setup. Turned out to be a firmware thing — make sure you're on the latest version via VictronConnect (it'll prompt you when connected, even...
Really useful thread. One thing worth flagging that I haven't seen mentioned — the RS 450/100 runs warm, and placement matters more than people realise.
BreezySparky | Posts: 412
Worth adding — if you're using a Victron BMV or SmartShunt alongside the Multiplus, make sure the two are actually talking to each other via VE.Smart networking.
The 150/60 will throttle itself if your array voltage is sagging under load—have you checked what you're actually seeing at the MPPT terminals during peak generation?
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