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Triple battery system question?
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<blockquote data-quote="blisters" data-source="post: 250676" data-attributes="member: 4992"><p>Your charger is rated for 75-200ah capacity so with the 80 plus the 120 you are on the design limits at 200ah. I would assume the float should be on the same output circuit as other modes and should be able to provide the required current to both batteries and stay in float but the pamphlet for the charger says:</p><p></p><p>"The BCDC charger then switches to the float</p><p>stage where it retains the 100% charge until a</p><p>load on the auxiliary battery causes the battery</p><p>voltage to drop below a predetermined voltage</p><p>where it then re-enters the boost stage."</p><p></p><p><a href="https://www.redarc.com.au/Content/Images/uploaded/Flyers/Redarc%20brochure%20-%20BCDC%20Range.pdf" target="_blank">https://www.redarc.com.au/Content/Images/uploaded/Flyers/Redarc brochure - BCDC Range.pdf</a></p><p></p><p>This information suggests to me that if you have a fridge running then the float mode might not supply enough current and the charger will return to the boost mode and you will have overcharge problems on the smaller battery. There is no harm in testing your float idea though. If it doesn't work or sounds a bit risky I would get a 10a charger for the 80ah battery or use an isolator as mentioned above. One thing though when the battery drops to float it is charged so there's no reason to keep it on charge if it is not being used so no need to put them back in parallel.</p><p>Jon</p></blockquote><p></p>
[QUOTE="blisters, post: 250676, member: 4992"] Your charger is rated for 75-200ah capacity so with the 80 plus the 120 you are on the design limits at 200ah. I would assume the float should be on the same output circuit as other modes and should be able to provide the required current to both batteries and stay in float but the pamphlet for the charger says: "The BCDC charger then switches to the float stage where it retains the 100% charge until a load on the auxiliary battery causes the battery voltage to drop below a predetermined voltage where it then re-enters the boost stage." [url]https://www.redarc.com.au/Content/Images/uploaded/Flyers/Redarc%20brochure%20-%20BCDC%20Range.pdf[/url] This information suggests to me that if you have a fridge running then the float mode might not supply enough current and the charger will return to the boost mode and you will have overcharge problems on the smaller battery. There is no harm in testing your float idea though. If it doesn't work or sounds a bit risky I would get a 10a charger for the 80ah battery or use an isolator as mentioned above. One thing though when the battery drops to float it is charged so there's no reason to keep it on charge if it is not being used so no need to put them back in parallel. Jon [/QUOTE]
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Triple battery system question?
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