They work in the extreme heat of the Mojave Desert, operating up to 176°F. A higher operating temperature allows for flexible installation options, from the engine bay to inside a trailer. They won’t break down when you need them most.
Received confirmation from Ctek that the D250SA will not interfere with the alternator charging the starter battery at full amperage.
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NONE of these units will interfere with the alternator charging the starter battery, we are talking about the maximum output to the CAMPER battery. With the D250S it is 20A, with the REDARC, it is 40A. Sterling makes a few units that go even higher.
All B2B are logically (if not always physically, see luthj's comments) attached between the starter battery and the camper (house) battery. Thus the train is alternator>starter battery> camper battery.
Indeed, the selling point for a B2B is that it does not interfere with the factory wiring in any way. (It just tricks the alternator into thinking that the starter battery is discharged.)
I looked at the Redarc site last night and will call them later, but their unit is physically pretty large so need to figure out where to mount it.
The measurements should be available on the respective websites. The REDARC is a lot smaller than the Sterling A2B that I used.
The REDARC is shorter and lower, but wider than the CETEK. The CETEK may be even taller as the connections are on top.
...l indicates that absorption charge is at 14.1V for sealed batteries, which seems far from ideal for AGMs. Need to read the manual in more detail.
"Sealed" can mean gel, AGM, or VRFLA. Don't go by the title, go by the absorb voltage that you want. For most AGM that is 14.4v or a bit higher at 70F.
Because that's a Starter batt size, not for deep cycling, why was it selected?Have not been able to find any decent capacity true deep cycle AGMs in 6V or 12V that will fit the Grp 34 boxes for the house batteries. Would like to go with all one brand/same charge profile for starter and house, so looks like it's between Odyssey and Northstar. Leaning toward Northstar. I have looked at deep cycle AGMs from Lifeline/Concorde, Rolls/Surette, Trojan, MasterVolt. Grp 24 and 27 are too tall to fit. Any other deep cycle lines I should look at?
...
Best to change to G31 or 27 or for FLA EGC2 even better, box should fit the batts you want not v/v.