Is your yellow top optima a deep cycle battery? I remember you putting it in but cant find the thread. The c tec dont pull more than 20 a so will not strain your 110a alternator . What frige have you got where does it stop working ? May be you drain your battery to low? If i remember is about a 60ah If its a deep cycle you are close to 300 charges and that means you need a new one ....
Graham fitted a Ctek "Smartpass" together with my Ctek 250 Dual - this unit increases / boosts the current going through to your 2nd battery which helps a lot with short trips and / or slow drives at low RPM's. A pricey option, but it works.
Optima yellowtop are deepcycle. Full charge is 13.1v....i now get to 12.6v max. The battery lives on a custom mount attached to the chassis rail.
The dual battery management is piranha. The ctek is a smart AC charger. I chose against the CTEK smartpass as it only has 50C operating temperature. The piranha is 80C rated and know 2 others whobuse it.
Yes the battery has more than 300 cycles now...first switched on in May 2015 and switched off on vacations 3 times a year.
Maybe i will look into to adding the smartpass or similar system from other manufacturers.
Tinus lotz wrote:If your frige swiches of at 10.5v then you can use a high cycle agm also and it needs the same voltage as a crank battery around 13.8 v to 14v I
The ARB fridge I have has a 3 shut offs. I have left it on Medium setting which translates to shut off at 11.4V and restart at 12.2V The optima yellowtops are deep cycle AGMs, I believe that my recharge from the alternator for the 40 minute commute each way is not enough to get the AGM battery to near 100% and perhaps only 80%.