There's a HENRY in The Shed .......................... !!!!!!!

[Boots in Action]

@Boots in Action , actually caught my ProStar unit in the act of emulating an MPPT unit, I knew it did just never spotted it, fridge ran all night, battery was down to 12.2 and not happy, plugged in the external panel and bugga me it worked its way up to 7.2a for a short time then dropped to 6.1a in a matter of minutes then sat around 4.7a the way it charged up the van batteries years back was always better than other PWM controllers it was always good early morniing and late arvo if panel pointed correctly other PWM woudl be dead ..... I'll have to see if I can scrounge another one for the shed ...................... By the time I had found my meter it was back down so I didn't get to see what the volts were. ............... It all works so now can forget about and let it do its thing, though I think the 10 yr old GEL might be a bit iffy.

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@Drover , I always had an idea that the "Pro star" and "Morning Star" regulators were suitable for use with "house" panels as a lot of American systems use them for their off grid power systems up to 24 volts output, but can handle higher input voltages than the run of the mill solar controllers that are usually used with solar panels in Australia. Most of the cheaper PWM controllers you see around are not designed for input voltages from "house" panels and would probably have a hissy fit if confronted with around 37 volts. To my knowledge, most cheap PWM solar controllers max out at around 28 volts input to cover 24 volt systems. Unfortunately I believe it was NOT a MPPT performance but still a good PWM controller able to handle 37 volts from "home" solar panels, even though it performed outside/above standard specs. Perhaps the higher input voltage allowed higher outputs at 12 volts???

 

[Drover]

I used it in my shed to keep the boat battery charged from another house panel, the Prostar can operate with up to 60v coming down the line but then if you do the maths, if the volts is lower than whats on the plate the amps is higher, beyond my pay grade I think ............. mostly I see 36v on the feed ............ Big test for last 36 hrs and the GEL not only on its last legs, its down to one leg I reckon, happy as larry with fridge on and panel plugged in but just doesn't hold up all night, fridge kicks in at some time and it must drop below the 11.5 cut out, still okay for shopping use as a tour is way off so might have a new one by then, lithium would be nice but it would mean a new reg and with AGM beiing way cheaper then an AGM it will be...