You'll want the optima as it takes charge at a faster rate & therefore "tops up" the cranking battery because it is inevitably in a higher state of charge & because the isolator stays open longer the 2 batteries equalise
Thanks for the offer, but I think your actually referring to Ben_Vapid's comments.
"Out of interest did you get a full night from the fridge when using the lights as well?
I have the identical setup but seem to sometimes wake up to find the sc80 has cut the fridge out. I run an ageing waeco on low settings but i'm wondering if that might be the culprit."
My system worked faultlessly, I turned lights off after 3 hours and fridge ran all night.
Cheers
Cheers Vin
2025 D350 Defender 110
You'll want the optima as it takes charge at a faster rate & therefore "tops up" the cranking battery because it is inevitably in a higher state of charge & because the isolator stays open longer the 2 batteries equalise
We used it once to charge camera battery.
People use them for laptops etc.
I think I will remove it, can do without it.
Cheers Vin
2025 D350 Defender 110
Heya Tim,
It was me having the issues. My SC80 and Optima are only ~2 years old. Ive had this behaviour before so it's got me worried there's a fault somewhere.
When it happened on the last trip, i'd done a full overnight charge with my Ctek before leaving, and driven all day (4 hours bitumen then low speed offroad all day, don't know if that matters to the alternator).
I was running my Waeco on the 'cool' setting, so not even a deep freeze. Used an LED light strip plugged into one of the back 12v sockets for about an hour. The SC80 had tripped overnight and the fridge was off. My projecta monitor still shows a 12.4v charge on the Optima but the SC80 is flashing. Could the SC80 be tripping early?
Hey Ben,
Take a look at your Waeco manual. They have a low voltage cut out which can cause those symptoms. They come out by default to protect the starter battery - about that voltage you mentioned. I set mine back to cut out at 11.8V and no more problems.
Cheers,
Rob
Ben - isolating the main battery at 12.0V (Sc80 flashing) does not mean the fridge should cut out. In my case, the CFX50 compressor would switch off but not restart until the voltage got over the default 12.6V (high setting)! I have since adjusted this down to the low setting. Maybe your Waeco has different features - but on the CFX series you can't disable it - low-med-high voltage cut-outs are it.
I have a CF-50. It does have a low/med/high switch, but also a red emergency switch underneath it with on/off. I assumed that gave me the ability the disable the emergency cutout.
I'll try dig up a manual online to confirm. It is already on the low setting though.
"Emergency Switch. Should be in ?OFF? position for normal
operation. ?ON? position keeps cooling function running
continuously and bypasses the control panel in case of
electronic defect."
Low cutout on this model is 10.4v.
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