Solar charging wiring

[ostra4]

I have mounted a 100 watt panel on my boat through regulator then to two 110 amp batteries ,the battries are domestic supply for boat .Will the second battery be charged when the first becomes full or would I need to connect a jumper wire across so the solar panel charges both batteries.Iv googled the answer but its still not clear to me ,I know it's a basic question but I'm electrically dyslexic . Iv connected the input plus and minus to just one battery .

 

[chrisbitz]

both batteries need to be linked, positive to positive, and negative to negative. and then they'll both charge together.

 

[sailorman]

https://www.google.co.uk/search?cli...+in+parallel&sourceid=opera&ie=UTF-8&oe=UTF-8

 

[ostra4]

They are already linked but do you mean the wires from the solar panel regulator need to be linked across ?

 

[duncan99210]

Your 2 domestic batteries are already, electrically speaking, a single battery as they are linked together positive to positive, negative to negative. Connecting your solar charger wires to one battery will therefore charge both.

 

[ostra4]

Thanks for that ,saved me a little job today !

 

[CPD]

I hope you used the correct gauge cable for the panel to avoid voltage drop ? - The 100W panel may be the equivalent of a 20W panel if not ........

 

[charles_reed]

I hope you used the correct gauge cable for the panel to avoid voltage drop ? - The 100W panel may be the equivalent of a 20W panel if not ........

4amps max in UK - probably doesn't need a regulator - say 14swg

Here the calc:-
Results
1 conductors per phase utilizing a #14 Copper conductor will limit the voltage drop to 2.98% or less when supplying 5.0 amps for 20 feet on a 18 volt system.
For Engineering Information Only:
15.0 Amps Rated ampacity of selected conductor
2.9495 Ohms Resistance (Ohms per 1000 feet)
0.058 Ohms Reactance (Ohms per 1000 feet)
0.8999999999999999 volts maximum allowable voltage drop at 5%
0.536. Actual voltage drop loss at 2.98% for the circuit
0.9 Power Factor

 

[nigelmercier]

And don't forget the fuse.