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| Bluest Member Since: 23 Apr 2016 Location: Lancashire Posts: 4230   
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When you say B2B are a big upgrade, I think it really depends on lots of factors. A split charge relay or even a simple combiner switch can be perfectly adequate it some cases and you may see limited or no benefit. It all comes down to type of useage and battery chemistry really. 2007 110 TDCi Station Wagon XS
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13th Mar 2022 10:29am |
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| bear100 Member Since: 22 Mar 2010 Location: South Wales Posts: 1953  
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from what i have read, the voltage solenoid will charge your battery to 80% but the B2B will fully charge to 100% and a lot faster.
i find on our expeditions if i park up for more than 2 days the Yellow Optima is down to 20% pretty much only the Engel running and an Led strip periodically, so the 20% extra would benefit me. I'm not really impressed with the Optimas, i think i should have gone with Odyssey's 2023 Defender L663 V8 2016 Range Rover Autobiography 4.4 TDV8 (gone) 2010 110 XS Utility 2.4TDCI 2010 Range Rover Sport TDV8 (gone) 2007 Discovery HSE TDV6 (gone) 1993 110 csw 200 tdi (gone) 1994 90 HT 300 tdi (gone) 1994 discovery 300tdi (gone) 90 hybrid 3.5 v8 (gone) Range rover bobtail 3.5 v8 (gone) |
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13th Mar 2022 5:33pm |
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| miker Member Since: 13 Sep 2015 Location: Surrey Posts: 1768 
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Assuming your 2 batteries are in good health, and "similar" then the alternator output will charge them to full just fine. The faster comment is interesting, as that depends on how big the DC to DC charger is. A good 30A output one is over £200, and even then I've seen my alternator put 60+A into my leisure battery when flat...
It might be worth you getting a Shunt or power meter for your current setup, see how many Ah you're actually putting into and taking out of your batteries as it is. Follow up edit: If you have a vehicle with a smart alternator it's a completely different kettle of fish. |
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13th Mar 2022 7:43pm |
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| bear100 Member Since: 22 Mar 2010 Location: South Wales Posts: 1953
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A smart alternator?
 what's one of those?
i have a red and yellow top Optima around 2 years old. Good idea i could wire up my multimeter to take some readings  2023 Defender L663 V8
2016 Range Rover Autobiography 4.4 TDV8 (gone) 2010 110 XS Utility 2.4TDCI 2010 Range Rover Sport TDV8 (gone) 2007 Discovery HSE TDV6 (gone) 1993 110 csw 200 tdi (gone) 1994 90 HT 300 tdi (gone) 1994 discovery 300tdi (gone) 90 hybrid 3.5 v8 (gone) Range rover bobtail 3.5 v8 (gone) |
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14th Mar 2022 7:23am |
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| miker Member Since: 13 Sep 2015 Location: Surrey Posts: 1768
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Newer cars modulate the alternator output according to driving conditions to match load and improve economy/reduce emissions. In those cases you can't just strap a second battery in with a split charge.
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15th Mar 2022 4:22pm |
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