Connection of starter battery to Spare Solar Controller Output

Bustup15

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Jun 25, 2018
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One for Lenny HB and others of the technical ilk

I've found during the winter that the starter battery is gradually dropping its voltage presumably caused by the tracker and alarm systems load but the solar is keeping leisure batteries fully charged.

Quick query on the best place to connect my Votronic MPP solar controller to the starter battery.

All controllers and cabling are located in the rear garage, the starter battery is under the drivers feet.

Is it logical to simply cable from the solar controller spare output to the starter battery input of the EBL111 or is there a better location to connect to such as the HTM control module or B2B inputs etc?

Thanks in anticipation as always!

Neil
 

Lenny HB

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Either the input on the EBL or direct to the battery doesn't make any odds.
I don't use the solar output on my Votronic, I use a CBE CS2 relay it gives a higher charge rate and if the leisure batteries are high it will still charge the starter battery with no sun. It won't work with Lithium.
 
Last edited:
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Bustup15

Bustup15

LIFE MEMBER
Jun 25, 2018
883
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Durham
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Dethleffs Alpa I 7820-2
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New to motorhomes 2019
Either the input on the EBL or direct to the battery doesn't make any odds.
I don't use the solar output on my Votronic, I use a CBE CS2 relay it gives a higher charge rate and if the leisure batteries are high it will still charge the starter battery with no sun. It won't work with Lithium.
Thanks Lenny HB
Typically my EBL doesn't have the starter battery connected, it must go direct to the HTM. I've connected to the battery feed input to the B2B, hopefully it will all sort out.

Thanks again

Neil

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Apr 27, 2016
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Is it logical to simply cable from the solar controller spare output to the starter battery input of the EBL111
I'm not sure exactly what you mean by the starter battery input of the EBL111, so apologies if you already know this. There is a 3-way socket on the EBL111 labelled 'BL6 LR(S)', intended for solar power input. Pin 1 is the common negative, Pin 3 is to the leisure battery positive and Pin 2 is to the Starter battery positive. Pin 3 goes through a 15A fuse labelled 'Solar', so if not fitted you have to fit one.

Pin 2 doesn't appear to have a fuse on the EBL front panel. It connects to the starter battery using the Fridge 12V element supply wire. This is a separate wire going all the way to the starter battery, with a 20A fuse near the starter battery end.

The connectors are MnL (Mate'n'Lok) type, available from auto electrics suppliers like Altec Automotive or 12VoltPlanet.
 
Last edited:
Sep 29, 2019
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Mine goes direct from my Votronic to the starter battery, always full and never drops below 12.7 volts.

It was an easier cable run than to go anywhere else.
 
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