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5540Glen
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Call Sign : 9-CT-027
Posts : 3
Times Thanked : 0
Join date : 2020-07-12
QTH or Location : Kamloops, British Columbia
Equipment Used : Galaxy DX-959B

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PostSubject: Dual car battery system   Dual car battery system Icon_minitimeMon Jul 13, 2020 8:02 am

Does anyone know how to rig up a dual car battery system with means of 12V switching relays, or what other suggestions might one have for a separate power supply in a vehicle ?
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MrTang
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Call Sign : 26-CT-3732
Posts : 78
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Join date : 2020-07-12
QTH or Location : Stone, Staffordshire
Equipment Used : President Lincoln MKII V3

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PostSubject: Re: Dual car battery system   Dual car battery system Icon_minitimeSun Jul 19, 2020 6:41 am

I think something from caravan systems probably best way to go. They have split charging circuits, so when you towing caravan the batteries inside the caravan charge up.
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Alan Pilot
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Alan Pilot


Call Sign : 163-CT-220...MW7TTA
Posts : 1848
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Join date : 2019-11-19
QTH or Location : Anglesey North Wales
Equipment Used : Yaesu FT-991A,,Yaesu FTDX-10,,Icom ic-7300,,Anytone AT-D878UV PLUS",,LINCOLN II+.
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PostSubject: Re: Dual car battery system   Dual car battery system Icon_minitimeSun Jul 19, 2020 7:21 am

As above and easy to do.
Do a google and don't but from a caravan shop the relay is very cheep and a length of cable to the second battery location plus a shorter bit to switch the relay from ignition live.
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SierraOscar40
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Call Sign : 26-CT-3739
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Join date : 2020-07-21
QTH or Location : Southampton, Hampshire
Equipment Used : TTi TCB900, Thunderpole T2000 Maxcom 20E

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PostSubject: Re: Dual car battery system   Dual car battery system Icon_minitimeWed Jul 22, 2020 10:34 am

Split charge systems are easy to wire up, but be mindful to either pick a supply point on the car that is only live when the engine is running or if going direct to the cars battery then you want to get a voltage sensitive relay so the second battery only charges when the engine is running ie voltage is higher than 13 volts.  Dedicated split charge relays can be expensive depending on charge current required.  I have used cheap voltage sensitive relays bought on Fleabay.  Otherwise there is the chance you can discharge both batteries, unlikely with a radio but you don't want to find out the hard way!

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