PV Gap

Ella Said:

How do I connect batteries to create a battery bank?

We Answered:

You are right , positive to positive then negative to negative keeps you on 12 volts. This is parallel connecting.
Use a wire diameter that is much the same as what you find on a car battery in a car.

Andy Said:

How to use solar panel to charge this device?

We Answered:

Bad idea it won’t work

a 6 volt battery should be charged steadily at 7 volts

Your 8-18 volts will let the smoke out or boil your battery

A voltage regulating charger controller would fix this problem but you’re never going to find one

Just forget the whole thing

edit
The type of voltage regulator you would need world have to be full electronic and spastic to exactly what your trying to do (you won’t find one to buy and you can’t make one its way to complicated)

Resisters won’t work
with a your variable solar voltage which means you’re getting a varying current as well this wont work at all.

Just for get it and chard your razor from the wall

Victoria Said:

I want to buy a solar charger for a 12v 10ah battery but solar panels are rated in watts. .?

We Answered:

Most batteries are designed for a 10 hour charge rate. In that sense 12 W is right for a 12 volt 10 ah battery. The catch is that the panels are usually specified for peak wattage. Since you can expect only about 6 hrs of sunlight even on a clear day with an average output at about80% peak wattage, you will be safer with 12 x(10/6)x(1/0.8) = 25 W.

Ernest Said:

What happens if I put a 100v, .5A solar panel on a 12V, 450cca Gel deep cycle battery?

We Answered:

The solar panel is capable of 1/2 Amp output. If you hook it to a 12V battery directly and the battery is discharged it will want more than 1/2 Amp and pull the voltage down until the battery is charged to a certain level. Eventually the battery will try to charge up to 100V which will definitely damage the battery. If you use a regulator circuit running off the solar panel that outputs 12V then you will have a constant voltage circuit which will still be limited to 1/2A or whatever the regulator is capable of outputting. Of course you can't just go out and connect 100V to any voltage regulator it has to be capable of running from 100V and dropping the voltage to 12V like the original charger that comes with the battery. The same explanation applies to a 72V battery. You have to limit the output voltage to 72V or risk overcharging the battery.

Timothy Said:

What kind of 12v battery charger should I get for my boat?

We Answered:

A quality three stage charger is the type to go for. Multiple output units are available, but they will not be designed to control other inputs such as wind/solar and alternators. These will have their own control systems, (although a solar array under 20 watts really doesn't need more than diodes to prevent reverse power bleed at night as the input is so low - more a maintenance charge) most engine fitted alternators will not lift the batteries significantly over 70% charge levels without many hours of engine running as they are not designed to. You cannot combine different structure batteries in the one circuit, such as lead acid and GEL, or AGM types. These are built very differently and the internal resistances and capabilities are far too different to be charged from the same source.

You would probably not set up a system to use all types simultaneously - although there are (expensive!) ways of doing this with large control systems. Rather use the mains charger to get the batteries up to near 100%, solar to maintain and float charge at near 100% and the alternator for general power requirements on board while the engine is running with the batteries used as a fully capable back up when at anchor. Alternators are designed to supply base load power with the batteries used simply as a smoothing device, (like a capacitor) and to start the main engine - this is why a starting type battery is unsuitable for more than brief use without the engine running and certainly not for deep discharge.

If you have more than one type of battery construction you will need the charger to specifically be able to deal with different types at the same time. Most units can be set for different charge regimes - but few can do different types at the same time, so this must be checked carefully. It can be simpler to install individual units for each battery in some cases, C-Tek and similar quality units are designed to be mounted permanently on the machine and are very reliable.

Good luck.

rico said:

can a71vsolarpanelbe connected with a12v solarpanel