hi could some help me please i have fitted a wind turbine to run a 12volt electrical system but cannot find the circuit to connect the battery to a 300watt immersion all i have been told that it requires a stable voltage from the battery

 

I think you mean "inverter", not "immersion".

Inverters are widely available and cheap. The biggest selection is likely available at automotive parts stores and truck stops. Especially for 12v DC to 120vac inverters.

 

sorry i do mean immersion i bought 12v immersion on ebay that works dict but needs a clean supply

thanks

 

i also need to stay on dc not invert to ac

 

Then, immersion what? Immersion pump, immersion heater, immersion camera,...

 

What kind of control do you need, switch on at a certain point or keep permanently connected?
I didn't mean to come between a couple of Gophers!!
Max.

 

...i have been told that it requires a stable voltage from the battery

Who told you that? Battery voltage tends to be very stable within the relatively narrow charged-discharged range.

 

sorry i do mean immersion i bought 12v immersion on ebay that works dict but needs a clean supply

thanks

Last time I checked - an immersion heater was a spiral of resistance wire packed into a copper tube.

Why would a 12V one be any different?

 

sorry better be more spacific it is a 12v 300watt imersion heater element what i would like to do is connect this to a battery to heat up my thermal store the battery is conected to a pv and combined with a wind turbine they charge the battery up when either the wind or the sun operates them ,ihave connected these to a charge controller so when the battery is fully charged the controller beaks the contact .what i cannofigure out is the circuit from the battery to the imersion element i think i may have to fit a voltage regulator between the battery and the immersion element

 

What do you expect the maximum voltage to be when fully charging?
Max.

 

If the immersion element is designed for 12V, I don't see the need for a voltage regulator. Are you asking about how to switch the solar/wind output from the battery to the heater?

 

What do you expect the maximum voltage to be when fully charging?
Max.

For maximum battery life; there should be a UVLO circuit to drop the load at certainly no lower than 10.8V - I've seen stickers on car batteries; "charging not to exceed 14.4V".

 

That is to avoid sulfation of the plates.
That was the reason I asked what the maximum is I would expect a immersion heater to take this without any regulator needed?
Max.

 

hi i think 13.5 volts the battery is 113 amps

 

i am asking how to switch so can take the supply from the battery iam thinkinking that if the solar /wind is charging and i connect the battery to the immersion then will this not cause the battery or the wiring to overheat

 

@gopher45,Some large wind turbines use immersion type heaters to bleed off current after the batteries are fully charged. Is this what you are talking about? If so it is part of a "charge control circuit". Maybe Google can give some ideas, there's a lot of information out there, if you use the right terms when searching.

 

@gopher45,Some large wind turbines use immersion type heaters to bleed off current after the batteries are fully charged. Is this what you are talking about? If so it is part of a "charge control circuit". Maybe Google can give some ideas, there's a lot of information out there, if you use the right terms when searching.

IIRC; "off grid" is a useful keyword.

 

If your wiring overheats, it's not large enough to handle the current demand. That shouldn't happen under any circumstance

You shouldn't need a voltage regulator for the heater, think of it like a large resistor. It's not terribly sensitive to voltage changes. All you'll see is a bit more heat at higher voltages, and a bit less heat at lower voltages.

However, I would invest in some sort of charge controller for the battery.

 

What is the nature of your generator?
DC PM or wound field etc?
300w is peanuts for a load over and above the charging current.
Max.

 

the manual that came with the pv said 13.5 volts