So we bought our TT in late Sept. Got 10 nights and 1000 miles of camping in. Now we've winterized and I'll be adding a cheap-o solar trickle charger to the batteries which are two crummy Interstate "Deep Cycles" wired in parallel(we'll upgrade to two Trojan 6v in the spring if they'll fit). We don't have the option to disconnect and store them anywhere/they will be staying on the trailer over the winter.Question: Where do the claps go? I assume positive on one batt, negative on the other batt. But which combo?

Yep, RED to positive and GREEN to negative. Our fiver is set up that way, also my diesel PU. As both are stored during the winter months.

Clamp to the same terminals that the trailer is using now.

Just make sure you are connecting to the correct POS(+) and NEG(-)- terminals. Can't always go by the color of the wires. Find the word POS and NEG or the symbols + and - on the battery case. Photos from GOOGLE SEARCHYou should also learn how to check your battery fluids and do this every couple of weeks to be sure your small trickle charger is not boiling out your battery fluids...I would also pick up a inexpensive mulitmeter and keep tabs on your battery DC Voltages. A fully charged battery will read 12.6-7VDC across the battery terminals. You do not want the battery levels to EVER get below 12.0VDC for an extended time otherwise you will start doing harm to your batteries.Roy Ken

This is what is balanced and best for twin twelve volt batteries.As it often doesn't cost a dime more to do this, I think it is worth the trouble.If you wish to understand the "why" surf here:correctly interconnecting multiple twelve volt batteriesOthers may say it doesn't matter--but unless there is a compelling reason to not optimize charging and discharging why not do it the best possible way?

For trickle chargeing it does not matter you can hook both to the same battery or positive to one and negative to the other (and it does not matter which one if they are in parallel) your choice.one word of caution,, Solar panels come in two types.. Some have built in reverse current blockers (Diodes) some do not, if yours does not then it charges by day and DISCHARGES by night.

Trickle Charge 2 12v batts in parallel question???

pianotuna
Nomad III
Nov 24, 2014
This is what is balanced and best for twin twelve volt batteries.

As it often doesn't cost a dime more to do this, I think it is worth the trouble.

If you wish to understand the "why" surf here:

correctly interconnecting multiple twelve volt batteries

Others may say it doesn't matter--but unless there is a compelling reason to not optimize charging and discharging why not do it the best possible way?
RoyB
Explorer II
Nov 24, 2014
Just make sure you are connecting to the correct POS(+) and NEG(-)- terminals. Can't always go by the color of the wires. Find the word POS and NEG or the symbols + and - on the battery case.

Photos from GOOGLE SEARCH

You should also learn how to check your battery fluids and do this every couple of weeks to be sure your small trickle charger is not boiling out your battery fluids...

I would also pick up a inexpensive mulitmeter and keep tabs on your battery DC Voltages. A fully charged battery will read 12.6-7VDC across the battery terminals. You do not want the battery levels to EVER get below 12.0VDC for an extended time otherwise you will start doing harm to your batteries.

Roy Ken
rrupert
Explorer
Nov 24, 2014
Clamp to the same terminals that the trailer is using now.
mpfireman
Explorer
Nov 24, 2014
Yep, RED to positive and GREEN to negative. Our fiver is set up that way, also my diesel PU. As both are stored during the winter months.

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Trickle Charge 2 12v batts in parallel question???

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