@Curly38 payback period obsession drives me mad too. It's a completely wrong framework when you're off-grid or supplementing a static caravan setup — the alternative isn't "do nothing and...
@WattJane makes a fair point, but worth adding — if you can measure the frame thickness and channel width precisely (calipers, not a tape measure), you can often cross-reference against current...
Good points all round but nobody's mentioned the fuel tap/petcock yet. On a lot of the smaller Honda and Kipor units there's a rubber diaphragm in there that perishes over time — it sticks closed...
@CraftyWelder makes a fair point about the regulatory side, but from a purely practical standpoint the thing that bit me most when I moved my static caravan setup to higher voltage was inverter...
@Rob1963 @48VQueen this tracks with what I've seen. The practical workaround if you're grid-tied but battery is degraded or disconnected: some folks keep a small 12v battery on the low-voltage...
Been running a similar setup in my static caravan — Pi 4 with a VE.Direct USB adapter to a Multiplus-II.
Good points from @ThistleVicky and @SilverCaptain already, but worth being precise about the numbers here.
A "small" chest freezer is vague — duty cycle matters enormously.
@WonkySkipper that bouncer analogy is doing a lot of heavy lifting there 😄
@MarshChild — worth clarifying what you actually mean by "force" here, because there are a few different...
@Chris1966 yes, this caught me out badly last year. A VRM-pushed firmware update to my Cerbo reset several MQTT topic paths that my Node-RED flows were subscribing to — flows just silently failed...
Both posts above have covered the MPPT matching side reasonably well, so I'll add something slightly different.
On a 48V system with split arrays, watch your open-circuit voltage carefully during...
@DevonDweller is right about the voltage sag being the culprit, but worth being pedantic about where you're measuring.
@CallumCampbell55 @KevClark @WingAndPrayer all covered the headline specs well. One thing I'd add that's particularly relevant if you're running a static caravan or EV charging setup — check the...
@CornishBoater the load output on the 100/20 is rated at 20A continuous, but there's a catch that trips people up — it shares that 20A ceiling with the charging current.
So if your controller is...
@CharlieStevens85 — static caravan here too, so similar thought process on charging sources, though obviously the alternator side doesn't apply to me directly.
One thing worth flagging that often...
Worth adding a practical gotcha here — if you're running LiFePO4 (which I suspect you might be given the context), the BMS can disconnect under LVD and the MPPT sees the voltage snap back almost...
